If your internet seems to get flakier every time the temperature drops to −30 °C, you’re not imagining it — but the cold itself is rarely the real culprit. Data moves through fibre and copper cable just as fast in January as in July. What changes in a Prairie or northern BC winter is everything around the signal: outdoor connectors shrinking and letting in moisture, ice on lines and dishes, snow on antennas, equipment sitting in unheated garages, and storms that knock out the power.
The short answer: cold weather doesn’t slow internet down on its own, but it exposes weak spots. Loose or corroded outdoor connections, satellite dishes buried in snow and routers kept below freezing are the usual reasons service drops or slows in winter. Most are fixable, and a few minutes of prep in the fall prevents most of them.
What cold actually does to an internet connection
| Connection type | Common winter problem | What you’ll notice |
|---|---|---|
| Cable (coax) | Outdoor connectors contract and let in moisture; corrosion over time | Drops during cold snaps, slower speeds, TV pixelation |
| Fibre | Ice or snow-clearing damage to the drop line; ice in buried conduit | Sudden, complete outage rather than slowdowns |
| Satellite (e.g. Starlink) | Snow or ice on the dish; extreme cold below its rated range | Brief outages during storms, “obstructed” warnings |
| Fixed wireless | Snow-loaded trees or ice on the antenna blocking line of sight | Higher latency, slower speeds, intermittent drops |
| Any type | Indoor gear in a cold garage or cabin; winter power outages | Modem rebooting, WiFi dropping, everything off in a storm |
Cable internet: it’s usually the connectors
Cable internet runs over coaxial cable from the street to a connection point on the outside of your home, then inside to your modem. Metals contract in the cold, and the copper core, the metal connector and the plastic jacket all shrink at different rates. A fitting that was snug in August can develop tiny gaps by January. Moisture gets in, freezes and expands, and over time it corrodes the connection. The result is a signal that is fine on a mild day and drops out when a cold front rolls through.
What you can safely do:
- Check the indoor connections first. Make sure the coax is finger-tight on the back of the modem and on any splitter or wall plate. Remove splitters you don’t need; each one weakens the signal.
- Look at the outside connection box (often near the hydro meter or gas meter) for cables that are kinked, chewed or hanging loose. Don’t open sealed provider equipment or climb anything.
- Write down when it happens. If drops line up with cold snaps or wind, tell support. That pattern points to an outdoor connection and helps the network technician find it faster.
Lines and equipment beyond your home belong to the network owner, so if the fault is outside, a technician visit is the fix — not a new router.
Fibre internet: the glass doesn’t mind the cold
Optical fibre carries light, and temperature doesn’t change how fast it moves. That’s one reason fibre tends to ride out winter better than older technologies. When fibre fails in winter, it is almost always physical damage:
- Snow clearing. Snowblowers, shovels and roof rakes can catch the drop cable where it runs down an exterior wall or along the ground. Mark where your line enters the house before the first big snowfall.
- Ice and wind on aerial lines. Ice-loaded branches and overhead lines can sag or break during freezing rain.
- Ice in conduit. Water that collects in underground conduit above the frost line can freeze and squeeze the cable inside. Corning, one of the world’s largest fibre makers, documents this “ice crush” risk in its engineering notes (Corning AEN159).
Fibre problems tend to look like a full outage rather than a slow connection. If every light on your equipment says you’re offline after a storm, contact support rather than resetting everything repeatedly. For the differences between the two wired options, see fibre vs. cable internet.
Satellite and Starlink: snow, ice and the −30 °C line
Satellite dishes need a clear view of the sky, and snow or ice sitting on the dish blocks it. Starlink’s standard dish is rated to operate from −30 °C to 50 °C (Starlink product specifications). That covers most winter days in southern Alberta and BC, but northern Alberta and Saskatchewan regularly see colder nights.
The dish can warm itself to melt snow. In the Starlink app, the snow melt setting has three options: Automatic (the default, which adds heat when snow or ice affects the signal), Pre-heat (warms the dish ahead of a storm you know is coming) and Off. Heating uses more power, which matters if you’re on solar or a generator at a cabin.
- Mount the dish where snow sliding off a roof won’t bury it, and high enough to clear drifts.
- Leave snow melt on Automatic through winter; switch to Pre-heat before a big forecast snowfall.
- Don’t chip ice off the dish with a tool. Let it melt, or brush loose snow off gently.
Fixed wireless: watch the trees
Fixed wireless service beams internet from a tower to an antenna on your home, and it depends on a clean line of sight. In winter, heavy wet snow on spruce and pine branches can bend them into the signal path, and ice building up on the antenna itself can weaken the link. Look at what sits between your antenna and the tower after a heavy snowfall. If branches have sagged into the way, a trim in the spring will help. For more on rural options, read our guide to the best internet options in rural Alberta, BC and Saskatchewan.
Your indoor equipment has a temperature limit too
Home internet equipment is designed for heated living space. The Hitron CODA-56 cable modem and TP-Link Deco X55 mesh units, for example, are both rated to operate between 0 °C and 40 °C (Hitron CODA56 datasheet; TP-Link Deco X55 datasheet). Most consumer routers carry a similar rating.
- Don’t run the modem or a mesh unit in an unheated garage, shop or seasonal cabin. If you need WiFi out there, put the equipment in a heated space and extend coverage instead — our outdoor, garage and acreage WiFi guide covers how.
- Let new equipment warm up before you plug it in. A box that has been sitting in a delivery truck or on a cold porch can form condensation inside when it comes indoors. Leave it at room temperature for a few hours before powering it on.
- Keep gear away from cold exterior walls and drafty windows, and don’t tuck it next to a baseboard heater or furnace vent either.
Placement also affects WiFi coverage, so it is worth reading our router placement guide while you’re moving things around.
Winter storms and power outages
When the power goes out, your modem and router go with it, even if the network outside is fine. A small uninterruptible power supply (UPS) can keep the modem and main router running for a short outage, enough to finish a work call or keep a security camera online. Our guide to keeping internet running during a power outage explains how to size one. Keep your phone charged before a forecast storm, since mobile data is often the backup.
Why winter evenings can feel slower
Winter brings more people home and indoors in the evening: streaming, gaming, video calls and holiday guests with extra devices. Your household can easily run into the limits of an older router or a slower plan, even if nothing is wrong with the line. A few fixes help:
- Plug the TV, console or work computer into the router with an Ethernet cable — see Ethernet vs. WiFi.
- Prioritize the devices that matter with QoS settings.
- Set up a guest network for visitors so they don’t get your main password.
- Check whether your plan still fits how your household uses it with our internet speed guide.
A five-minute fall checklist
- Check indoor coax and Ethernet connections are snug; remove unused splitters.
- Walk the outside of the house and note where your internet line enters. Keep snowblowers and shovels clear of it.
- Move any modem, router or mesh unit out of unheated spaces.
- Satellite users: confirm snow melt is on Automatic and the dish isn’t under a roof edge.
- Consider a small UPS for the modem and router.
- Run a baseline speed test now, on a wired connection, so you have something to compare against in January. Our speed testing guide shows how to get an accurate result.
When to call for help
Restart the modem and router once, check the lights, and test on a wired connection. If speeds are fine wired but poor on WiFi, the issue is inside your home — start with our slow internet troubleshooting guide. If the wired connection also drops, especially in a pattern that follows the cold or wind, contact your provider and share the times it happened. That is usually a job for a technician on the network side.
Frequently Asked Questions
Does cold weather slow down internet?
Not directly. Data travels through fibre and copper cable at the same speed in any temperature. Winter problems come from what the cold does to equipment: outdoor connectors that contract and let in moisture, snow and ice on dishes and antennas, routers kept below freezing, and storm-related power outages.
Why does my internet drop when it's really cold outside?
On cable internet, the most common cause is an outdoor coax connection that loosens as metal contracts in the cold, letting moisture in. If drops line up with cold snaps or wind, note the times and contact your provider, because a technician usually needs to fix the outdoor connection.
Can I keep my modem or router in the garage in winter?
Not in an unheated garage. Common home equipment, such as the Hitron CODA-56 modem and TP-Link Deco X55, is rated to operate between 0 °C and 40 °C. Keep the modem and main router in heated space and extend WiFi to the garage with a mesh unit placed indoors or a properly rated outdoor solution.
Does snow affect Starlink?
Snow or ice on the dish can block the signal. Starlink's standard dish operates from -30 °C to 50 °C and has a snow melt setting (Automatic, Pre-heat or Off) in the app. Leave it on Automatic in winter, use Pre-heat before a big storm, and mount the dish where roof snow can't slide onto it.
Will my internet work during a winter power outage?
Only if your modem and router have power. A small uninterruptible power supply (UPS) can keep them running through a short outage, as long as the provider's network outside your home still has power.
Get a Connection Built for Western Canadian Winters
Good prep fixes most winter internet problems, but it can’t fix an ageing connection or a plan your household has outgrown. Get WiFi offers fibre and cable internet in communities across Alberta, BC and Saskatchewan, including Edmonton, Fort McMurray, Saskatoon and Prince George. Compare plans on our rates page, see bundles, or sign up online. More how-tos are in our Internet Guides hub.
Get WiFi is a local Canadian internet provider offering high-speed fibre and cable internet across Alberta.
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