Dark by Four: Tuning Your CCTV for a British Winter That Never Lets Up

By the time you read this, most of the UK is finishing its working day in near-darkness. Sunset in Manchester on 7 November lands around 4.30pm; Edinburgh is closer to 4.20pm. By mid-December you can knock another forty minutes off both. And it's precisely in this window — wet, dim, low-contrast, occasionally foggy — that a lot of home camera systems quietly stop being useful.

Not broken, you understand. Just... unhelpful. Alerts every four minutes because of rain on the lens. A number plate you can't read. A face rendered as a grey smear because the camera flipped to infrared and the porch light bleached the whole frame out.

The encouraging bit is that most of this is a settings problem, not a hardware problem. Here's what genuinely changes when a British winter arrives, and what to do about it.

Why winter is harder on cameras than you'd think

The obvious answer is darkness, but that's only half the story. A camera's image sensor is judging contrast all the time, and a wet November evening gives it almost nothing to work with: a bright streetlight, a dark hedge, a reflective wet pavement, a car headlight sweeping past. Add drizzle in the air and the whole scene softens into mush.

There's also the small matter of the sun. In December it sits painfully low in the sky, and between about 9am and 3pm it can shine almost directly into a south-facing doorbell. That's a glare problem, not a night-vision problem, and the two need different fixes.

Then you get the boring physical stuff: condensation inside domes, spiders treating the housing as a conservatory, and a lens that hasn't been wiped since the summer.

Let's take those in turn.

IR versus colour night vision: pick deliberately

Almost every consumer camera sold in the UK runs infrared LEDs that kick in when light drops below a threshold. The result is a black-and-white image with a slightly haunted quality, and it's fine — up to a point.

That point is usually about three to five metres. Beyond that, IR falls off sharply. A driveway camera that reads beautifully at 2am in July will look like it's filming through a fog when the same scene is wet in December, because IR light bounces off water droplets and back into the lens.

What helps:

• Check your IR range. It's in the spec sheet and it's usually optimistic. If your camera claims 30m, assume 15m of usable detail.
• Consider colour night vision if you have ambient light — a streetlamp, a porch light, a neighbour's security flood. Some cameras have a colour-at-night mode that keeps the sensor in colour and boosts gain instead of switching to IR. It's noisier but often more useful, because colour is what lets you describe a coat, a car or a van.
• Turn off the onboard floodlight if your model has one that triggers on every moth. It flashes all night and annoys the street.
• Don't bother with IR if the camera is looking at a wall two metres away. You'll just get a white bloom.

One practical tip: if your camera has a separate sensitivity setting for when the IR cuts in, raise it slightly in winter. Fewer needless flips between modes means fewer washed-out frames.

Wide dynamic range and the low winter sun

If your camera has a WDR (wide dynamic range) or 'backlight compensation' toggle, winter is when it earns its keep. WDR handles scenes with both very bright and very dark areas — a doorway in shadow with a bright wet road behind it, for instance.

It's usually set to 'off' or 'auto' out of the box. Turn it on, then check the live feed at around 2pm on a clear day when the sun is low. You should see more detail in the shadowed part of the frame. If the image starts looking flat and grey, drop it a notch. Too much WDR makes everything look like a watercolour.

Also worth checking: exposure compensation. Many cameras let you nudge brightness up or down a stop. If your footage is blowing out whenever a car passes, pull it down.

Motion zones so rain and headlights stop pinging your phone

This is where most people give up and mute their notifications, which defeats the whole purpose. Before you do that, spend twenty minutes with the app.

Draw zones properly. Most apps let you paint a detection area. Exclude the pavement, the road, the tree that waves at the sensor, and any busy footpath. Keep the zone tight to your gate, path and door.

Drop the sensitivity. Default settings are almost always too twitchy. Rain, fog and drifting leaves all count as movement. Reduce the sensitivity step by step until you only get alerts for things roughly human-sized.

Use person and vehicle detection if your camera has it. It's not perfect, but it filters out a huge amount of weather noise. Crucially, it usually keeps working in rain where plain motion detection doesn't.

Set a schedule. You probably don't need alerts at 11am on a Tuesday when you're in the kitchen. Restricting notifications to night hours cuts the noise dramatically and makes you far more likely to actually look at the ones you get.

Adjust the alert cool-off. If your camera re-alerts every 10 seconds, set it to 60 or 120. One notification per event, not twenty.

Condensation, spiders and grubby domes

None of this is glamorous, but it's where winter performance really lives.

• Condensation inside a dome usually means a seal has failed or the housing was installed in humid conditions. Some domes have a small silica gel sachet inside; replacing it is a two-minute job. If moisture keeps returning, the gasket needs attention.
• Spiders love the warmth of IR LEDs and the shelter of a housing. A bit of insect repellent on the casing (not the lens) helps, as does clearing webs every couple of weeks. Don't spray anything directly onto the glass.
• Dirty lenses are the single most common cause of 'my camera has gone blurry'. A microfibre cloth and a drop of water, once a month, is all it takes.
• Cable glands and connectors — check them before the frosts. A bit of self-amalgamating tape over an exposed connector costs pennies and saves a dead camera in January.

A pre-winter checklist you can do in an afternoon

1. Wipe every lens with a microfibre cloth.
2. Clear cobwebs and check no foliage has grown into the field of view.
3. Confirm the IR LEDs actually glow (view the front of the camera with your phone camera at dusk).
4. Switch on WDR or backlight compensation and test at 2pm.
5. Redraw motion zones and cut sensitivity by a couple of steps.
6. Enable person/vehicle filtering and set a night-only notification schedule.
7. Check the app's footage from a week ago still plays back — this is the moment you find out the SD card has died.
8. Look at cabling and glands for water ingress.
9. Note the firmware version and update if there's a newer one.
10. Verify your NVR or cloud retention period hasn't quietly changed with an app update.

None of this requires a new camera. What it requires is an hour of attention twice a year, once when the clocks go back and once when they go forward. Do that, and the dark months stop being the period your CCTV is technically recording but practically useless.

If you're putting a system in from scratch and the winter performance matters — and in the UK it always does — it's worth talking to an installer who'll actually test it in the rain rather than at noon in August.