Indoor vs outdoor security cameras: how they differ
What an outdoor rating actually buys you, worked out from the IEC test tables, two real datasheets and a New York year of weather, with figures that decode the ratings and calculate when a camera fogs.
Technical figures checked against the standards listed at the end.
An outdoor security camera differs from an indoor one in its housing, not its picture: it is sealed and tested against dust and water jets, built to take a hit, and rated to run through winter nights and summer sun. So the indoor vs outdoor camera choice comes down to three numbers on the datasheet: the IP rating for dust and water (IEC 60529), the IK rating for impact (IEC 62262) and the operating temperature range. The outdoor bullet camera used as the example in this guide is rated IP66/IP67, IK10 and -40 to 140 °F; the indoor dome from the same maker is rated IP42, IK08 and 32 to 113 °F, with no condensation allowed.
The sensor, lens and recorder can be identical. What changes is what the camera can survive, and some spots inside a building are harsher than the label suggests: an unheated vestibule, a parking garage, a loading dock, or a camera looking out through a shop window. Each of those gets worked through below.
The figures use one building: a four-story mixed-use building in Brooklyn with a shop on the ground floor, apartments above, and a front wall that faces south onto the street. It has a street door under a shallow canopy, a vestibule between the outer and inner doors, a heated hallway, a rear yard and a roof. It is an example, not a client's building.
01Indoor vs outdoor cameras: what actually differs
Put an indoor dome and an outdoor bullet from the same maker side by side and the image specifications can read almost the same. The datasheets part ways in the environmental section, and that section is the one to read. Here are two real ones, with the brand left off.
Swipe the table sideways to see both cameras.
| Specification | Indoor mini dome | Outdoor bullet |
|---|---|---|
| Dust and water, IEC 60529 | IP42 | IP66 and IP67 |
| Impact, IEC 62262 | IK08 (5 joules) | IK10 (20 joules) |
| Operating temperature | 32 to 113 °F (0 to 45 °C) | -40 to 140 °F (-40 to 60 °C) |
| Start-up temperature | Not listed | -40 °F (-40 °C) |
| Operating humidity | 10 to 85 percent, non-condensing | 10 to 100 percent, condensing |
| Corrosion | Not listed | NEMA 4X |
| Storage temperature | -40 to 149 °F (-40 to 65 °C) | -40 to 149 °F (-40 to 65 °C) |
Three rows in that table do most of the work. The IP rating says how well the housing keeps out dust and water. The IK rating says how hard an impact it survived in the lab. The operating temperature and humidity say where the electronics will keep working. Look at the storage line too: both cameras can sit in a cold warehouse at -40 °F, but only one of them is rated to run there.
The rest of the outdoor camera follows from those ratings: gaskets at every seam, a sealed cable entry or a short sealed pigtail instead of an open jack on the back, a hard-coated dome or front glass, and on many models a heater. The corrosion line matters near the street: NEMA 4X is a United States enclosure type that adds corrosion resistance, useful where road salt spray reaches a camera.
The rule that falls out of this is simple. An outdoor camera can go anywhere, indoors included. An indoor camera belongs in a dry space that stays at room temperature. Our security camera installation work picks the housing for each spot on the site walk, and our guide to planning cameras for an office building covers the rest of the system choices.
02IP ratings for outdoor security cameras, decoded
An IP code is two digits defined by IEC 60529. The first digit, 0 to 6, is protection against solid objects and dust. The second digit, 0 to 9, is protection against water. Each digit names a specific lab test, so the code is a test record, not a grade. An X in place of a digit means that test was not claimed: IPX7 says nothing about dust.
Pick digits in Figure 1 to see what each test involves, or start from a common rating.
No ingress of dust.
Powerful jets from any direction: a 12.5 mm nozzle, 100 litres a minute, from 2.5 to 3 m, 1 minute per square metre and at least 3 minutes.
Powerful jets from any direction. The usual rating for a camera on an exposed outside wall.
Why IP67 alone is not enough for a wall
Up to 6, each water digit includes the tests below it: an IP66 housing has passed the 5 test as well. 7 and 8 are different. They are immersion tests, and the standard treats a housing marked only 7 or 8 as unsuitable for water jets unless it is marked for both. That is why outdoor cameras are often marked IP66/IP67: the slash means it passed the powerful jet test and, separately, 30 minutes with its lowest point 1 m under water. The 9 test sprays water at 80 °C from close range, the test for equipment that is pressure-washed; it does not cover immersion either.
You may also see IP69K. The K ratings come from a road vehicle standard, ISO 20653, not from IEC 60529. On a camera, IP69K points to washdown spaces such as food plants and car washes, not to a typical building.
What IP rating does an outdoor security camera need?
For a camera on an exposed outside wall, look for IP66, and IP66/IP67 where the camera sits low enough to see standing water or snow piled against it. Wind-driven rain hits a wall from every angle, and the jet tests are the ones that spray it from every direction. Under a deep canopy a lower water digit can work, but that spot still gets the outdoor cold and humidity, so the temperature and humidity ratings still decide it.
The rating also assumes the housing is assembled and sealed the way the instructions say. The example indoor dome's datasheet notes that the installation guide must be followed to meet even IP42. An outdoor camera with its cable gland left loose or an unsealed connector hanging in the rain is no longer the camera that passed the test.
03IK ratings: how hard a hit the housing takes
The IK code, from IEC 62262, is the impact half of an outdoor rating. The housing is struck five times at a set energy, and the energies climb fast at the top of the scale:
| Rating | Impact energy | Same energy as | In this guide |
|---|---|---|---|
| IK07 | 2 joules | 0.5 kg dropped 40 cm | |
| IK08 | 5 joules | 1.7 kg dropped 30 cm | The example indoor dome |
| IK09 | 10 joules | 5 kg dropped 20 cm | |
| IK10 | 20 joules | 5 kg dropped 40 cm | The example outdoor dome and bullet |
A camera within reach of the sidewalk or a stair landing should be IK10, and a dome is the better shape there: there is no body to grab and twist, and the clear dome is hard-coated against scratches on many outdoor models. IK says nothing about spray paint, a stick used to turn the camera, or a cable cut where it leaves the wall, so height and cable routing matter as much as the rating. Mounting higher costs detail on faces, and our guide to how far a security camera can see shows how the mounting angle trades against that.
04Do outdoor security cameras work in the cold and the heat?
They do if their rated range covers the spot, and New York's range is wider than it feels. From 1991 to 2020 the average Central Park low in January was 27.9 °F, and the average high in July was 84.9 °F. The records are -15 °F, on February 9, 1934, and 106 °F, on July 9, 1936. Figure 2 sets those numbers against the three datasheets.
Swipe the chart sideways to see the whole year.
Normal high 39.5 °F (4.2 °C), normal low 27.9 °F (-2.3 °C)
Record high 72 °F (1950 and 2007), record low -6 °F (1882)
The coldest month on average. Snow and ice, and road salt spray near the curb.
Out of rating: the average low (27.9 °F) is below its minimum.
Indoor mini dome: rated 32 to 113 °F (0 to 45 °C). IP42, IK08, 10 to 85 percent humidity, non-condensing.
The average low in January and February is below its 32 °F minimum, and the record lows of 7 months are below it too, down to -15 °F. Out of its rating for part of every winter, and it allows no condensation, which a cold space invites. The record high, 106 °F, is 7 °F below its maximum in the shade.
With the indoor dome in an unheated spot, the figure shows the problem directly: the average low in January and February sits below its 32 °F minimum, and the record lows of seven months go below it. Both outdoor cameras clear the coldest record by 25 °F. At the top, the outdoor dome has 16 °F above the record high of 106 °F and the bullet has 34 °F, before the sun is counted.
Summer sun on a south wall
A camera in direct sun runs hotter than the air around it, and the datasheet range refers to the air. How much hotter depends on the housing color, the wind and how long the sun sits on it, which is why camera makers sell sunshields and weathershields for protection from rain, snow and sun. The example bullet camera also lists a higher test maximum of 165 °F under NEMA TS 2, a standard written for roadside traffic equipment. On the example building's south-facing front wall, a camera over the street door sits in afternoon sun from spring to fall; the margin above the record high is what the sun is allowed to use.
Cold starts and heaters
Some datasheets list a start-up temperature next to the operating range. It is the coldest temperature at which the camera can power on from cold, for example after a power cut on a January night. The example bullet starts at -40 °F. Some cameras built for colder climates warm themselves with a heater before starting, and a heater draws power, so check the datasheet's power figure with the heater running when you size the PoE switch. Our technical guide to PoE camera installation covers switch power budgets, and what happens to footage in a power outage covers keeping the switch running.
05Why security cameras fog up: condensation and heaters
A fogged dome is water from the air, condensed on a surface colder than the air's dew point. The dew point depends only on the air's temperature and humidity, so it can be calculated: Figure 3 uses the Magnus formula with the constants published by Alduchov and Eskridge in 1996.
The classic case is the example building's vestibule in January. The outer door lets the cold in and the dome on the ceiling cools to near the outdoor temperature. Then the inner door opens, and lobby air at 70 °F and 35 percent humidity, with a dew point near 41 °F, rolls across a dome at 30 °F. Water condenses and freezes on it, and the picture goes white until the dome warms up.
Lobby air at 70 °F and 35 percent humidity meets a dome that cooled to 30 °F between the outer and inner doors (example).
Frost forms on the dome
The dome is 11.1 °F below the dew point of the air, so water condenses on it and freezes.
T = 21.1 °C; γ = ln(0.35) + 17.625 × 21.1 ÷ (243.04 + 21.1) = 0.359; dew point = 243.04 × 0.359 ÷ (17.625 - 0.359) = 5.1 °C (41.1 °F)
The summer case runs the other way. After a clear night, a housing can cool below the air temperature, and humid morning air at 75 °F and 90 percent has a dew point near 72 °F, so dew forms outside the dome until the sun dries it. The installer's case is the third one: a camera carried from a 25 °F van into a 72 °F room fogs the moment its housing is opened, and moisture sealed inside then fogs the glass from within on every cold night. Let it warm up in its box before opening it.
This is where the humidity line on a datasheet matters. "Non-condensing" means the camera is not rated for water forming on or in it: the example indoor dome is rated 10 to 85 percent, non-condensing. The outdoor bullet is rated 10 to 100 percent, condensing. Outdoor housings fight fog three ways: a seal tight enough that daily heating and cooling cannot pump humid air in, a heater or the camera's own warmth to keep the glass above the dew point, and sometimes a desiccant pack inside. In a vestibule, an outdoor-rated dome is the safer choice even though the spot is technically indoors.
06Can an indoor camera see through a window at night?
By day, often yes. At night, not with its own infrared on. The infrared LEDs sit in a ring next to the lens, and glass reflects part of every light that hits it: about 4 percent at each surface, from the Fresnel formula for glass with a refractive index near 1.5. A double pane has four surfaces, so about 15 percent of the infrared comes straight back from a few inches away, while the light that reaches a person on the sidewalk has spread out over a wide area and must cross the glass twice more to return. The reflection wins.
The infrared LEDs sit beside the lens. Each glass surface sends about 4 percent of their light straight back into the lens from a few inches away, while the light that reaches the sidewalk spreads out and has to cross the glass again to return. The picture fills with glare and the person outside is lost in it.
Turn the camera's infrared off. Moving the camera closer to the glass helps only if a hood blocks the LEDs from the pane.
Washed out
Through a clean double pane: 0.96 × 0.96 × 0.96 × 0.96 = 0.85 of the light passes each way, and 0.85 × 0.85 = 0.72 out and back. Coated or tinted glass can pass much less infrared.
Turning the infrared off removes the glare but leaves a second problem. At night a lit room is brighter than the street, so the window becomes a mirror and the camera records the room laid over the sidewalk. The setup that works from inside is all three at once: infrared off, the lens close to the glass behind a hood, and the street lit by a streetlight, a sign or a fixture over the door. Daytime has its own trap, since low sun on the glass can flare the image, so test at both times of day before you rely on it.
The reliable answer is a camera mounted outside with its own infrared. Our article on night vision cameras for NYC buildings goes further into infrared and low light, and the glossary entry on IR night vision covers the terms. A camera that looks out at the street also sees the public and the neighbors; our guide to security camera rules for NYC buildings covers where cameras can look (general information, not legal advice).
07Indoor cameras in garages, vestibules and unheated spaces
The test for any spot is not whether it has a roof. It is whether the space is heated, kept dry and kept clean like the rest of the building. If it is not, treat it as outdoors for temperature and humidity even when no rain reaches it.
- Vestibules. Close to outdoor temperature in winter and hit by warm, humid air every time the inner door opens, the case in Figure 3. An outdoor-rated dome, IK10 if it is within reach.
- Parking garages. Unheated, with exhaust grime, road salt carried in on cars and, in some garages, hose or pressure washing. An outdoor dome or bullet with IP66 or better, and wide dynamic range for the bright entrance against the dark deck.
- Loading docks and service doors. Open to the weather whenever the door is up, and the spot most likely to be hit by a cart or a hand truck. IK10 and a mount out of the way of loading.
- Unheated stairs, bulkheads and roof doors. Outdoor temperatures, sometimes with a roof leak above. The camera on the roof side of the door is fully outdoors.
- Boiler rooms and mechanical spaces. Heat rather than cold. Check the space against the camera's maximum, not just its minimum.
- Kitchens and washdown areas. Grease and spray. A sealed housing that tolerates the cleaning method used there.
Cameras for interior construction sites
The inside of a building under construction or renovation is not an indoor space for a camera. Drywall and concrete dust are fine and constant, heat may not be on yet, and power is temporary. A dust-tight housing, a first digit of 6, keeps dust off the sensor and the lens, and a wide temperature range covers an unheated floor in winter. Plan to move the cameras as the work moves, and to swap them for the permanent system at the end.
For the buildings we work in most, our pages on cameras for mixed-use buildings and warehouses show how these spots get covered.
08Installing an outdoor camera: mount, cable entry and power
The housing keeps water out of the camera. The installation has to keep water out of everything else. On an outside wall the camera mounts on a back box or junction box made for it, so the cable and its connection sit inside a sealed space instead of in the wall cavity. The cable comes into the box from below or with a drip loop, so water running down the cable drips off before it reaches the seal.
The cable itself is rated for where it runs: cable made for outdoor and wet locations outside, and inside, plenum cable (CMP) in an air-handling ceiling and riser cable (CMR) between floors, under the National Electrical Code, Article 800. Where it is exposed or within reach, it runs in conduit with fittings rated for wet locations. The hole through the exterior wall is sealed against water, and every penetration we make through a fire-rated wall or floor is fire-stopped. Our article on how low-voltage cabling supports integrated security goes further into routing and labeling, and our structured cabling page covers testing.
Masonry needs anchors made for brick or stone, set where the wall can hold them. In a landmarked building or historic district, exterior work may still need Landmarks Preservation Commission approval. Whether a permit applies depends on the scope and the building; we check during the site visit and say what applies before work is scheduled.
Power for an outdoor camera usually arrives on the same cable as video, through Power over Ethernet. A camera with a heater can need a higher PoE class, and a wireless outdoor camera still needs power at the spot; our comparison of wired and wireless security cameras covers that trade. Outdoor cameras also face more wear than indoor ones, and how long security systems last covers replacement timing.
09Indoor or outdoor camera? A checklist for each spot
Ask these for every camera location before choosing the model. Any yes to the first four points to an outdoor-rated camera.
- Can rain, snow, hose spray or washdown water reach it? Then look for IP66, or IP66/IP67 if water can stand or pile up around it.
- Is the space unheated, or open to the outside for part of the day? Then compare the datasheet's operating range with the coldest night, not the average one.
- Will warm, humid air meet a cold camera, as in a vestibule? Then the humidity rating must say condensing, or the camera needs a heater.
- Can someone reach it from the ground, a stair or a ledge? Then IK10, a dome shape and a protected cable.
- Does it sit in direct sun for hours? Then check the margin above the record high and consider a sunshield.
- Is it looking through glass? Then plan to turn its infrared off and light the scene, or move it outside.
- Is there dust from construction, a garage or a warehouse floor? Then a first digit of 6.
- How does the cable enter the camera and the building, and how is each hole sealed?
FAQIndoor vs outdoor security cameras: common questions
How do outdoor security cameras differ from indoor ones?
In the housing. An outdoor camera is sealed and tested against dust and water jets (an IP rating such as IP66), built to survive impact (often IK10), and rated for a wide temperature range and for condensation. The image sensor and lens can be the same as on an indoor model.
Can I use an indoor camera outside?
Not reliably, even under an overhang. The example indoor dome in this guide is rated 32 to 113 °F with no condensation allowed, while the average January low in Central Park is 27.9 °F. Use an outdoor-rated camera anywhere the air is not heated and dry.
Can I use an outdoor camera indoors?
Yes. An outdoor camera works anywhere an indoor one does, and it is the better choice in vestibules, garages, loading docks and other unheated spaces. In a heated room it is simply more housing than the spot needs.
What IP rating does an outdoor security camera need?
For an exposed outside wall, IP66: dust-tight and tested against powerful water jets. Where water can stand or snow can pile against the camera, look for IP66/IP67, which adds a 30 minute immersion test. IP67 alone does not include the jet test.
What does IP66 mean on a camera?
The first 6 means dust-tight: no dust gets in. The second 6 means it was tested against powerful water jets from any direction, 100 litres a minute through a 12.5 mm nozzle from 2.5 to 3 m, under IEC 60529.
Can a security camera see through a window at night?
Not well with its infrared on, because the infrared reflects off the glass back into the lens and washes out the picture. With the infrared off, the lens close to the glass behind a hood and the outside lit, it can work. A camera mounted outside is the reliable choice.
Get the right housing for every spot
The quickest way to settle indoor or outdoor is to look at each spot. Contact Seneca Security and we will walk the building, note which spots need outdoor-rated cameras and why, and put it in a written scope. Our commercial security camera page covers the rest of the work.
Sources and standards
- IEC 60529:1989+A1:1999+A2:2013, Degrees of protection provided by enclosures (IP Code)Tables 1 to 3 for the first and second digits; the water test conditions for 5, 6, 7, 8 and 9; dual marking such as IPX5/IPX7; the X placeholder.
- ISO 20653:2013, Road vehicles, degrees of protection (IP code)The source of the K ratings such as IP69K.
- IEC 62262:2002, Degrees of protection against external mechanical impacts (IK code)IK07 to IK10 impact energies, masses and drop heights; five impacts per test.
- NEMA 250, Enclosures for Electrical EquipmentType 4X adds corrosion resistance to the Type 4 requirements.
- NEMA TS 2, Traffic Controller AssembliesCited on the example outdoor datasheet for a 74 °C (165 °F) test maximum.
- National Weather Service, New York NY office, Central Park monthly climate almanacs1991 to 2020 normal monthly mean maximum and minimum temperatures, and daily record highs and lows with their years.
- A camera maker's datasheet for an outdoor bullet cameraOperating -40 to 60 °C, start-up -40 °C, 10 to 100 percent humidity, condensing; storage -40 to 65 °C; IP66/IP67 (IEC 60529), IK10 (IEC 62262), NEMA 4X; 74 °C maximum under NEMA TS 2; IEC 60068 cold, heat, damp heat, temperature change, vibration and shock tests.
- The same maker's datasheet for an indoor mini domeOperating 0 to 45 °C, 10 to 85 percent humidity, non-condensing; storage -40 to 65 °C; IP42 when installed per the installation guide; IK08.
- The same maker's product pages for an outdoor dome and a weathershieldOutdoor dome: operating -40 to 50 °C, IP66, IK10, hard-coated clear dome. Weathershield: sold for protection from rain, snow and sun.
- O. A. Alduchov and R. E. Eskridge, "Improved Magnus form approximation of saturation vapor pressure", Journal of Applied Meteorology 35 (1996), pages 601 to 609The constants 17.625 and 243.04 °C used for the dew point in Figure 3.
- Fresnel equations, reflection at normal incidenceR = ((n - 1)/(n + 1))², about 0.04 for glass with a refractive index near 1.5; in any optics text, such as E. Hecht, Optics.
- NFPA 70, National Electrical Code, Article 800Communications cable types, including plenum (CMP) and riser (CMR).
Have a project in mind?
Send us the address and the spots you want covered. We walk the building, then send a written scope. Same-day quotes when we can. Licensed and insured.