Why the Weather Affects Your Locks
A lock is a set of metal parts that have to move smoothly past each other, and temperature changes how they behave. In cold weather they tighten up and any trapped moisture can freeze; in heat the metal expands and the lubricant dries out. Both can leave you struggling to turn the key or lock a door that worked fine the day before. Here’s what’s going on, and what you can do about it.
Because a lock depends on metal parts moving against each other, the weather has a real effect on how it works. It’s worth checking your locks at least twice a year: make sure there’s enough lubricant and that everything still moves freely when you turn the key. This matters most for locks that are out in the elements, like a back gate, shed or garage.
Cold Weather and Locks
In cold weather a lock can stiffen or jam for two reasons: the lubricant inside thickens or freezes, and any moisture that has crept into the mechanism freezes and expands. As the lubricant thickens, the parts no longer slide smoothly, so the key feels stiff. If water has got in and frozen, it can block the keyway completely, so the key won’t even go in, and the expansion can damage the lock itself. Very cold metal can also contract slightly and turn brittle, which makes the problem worse.
The best fix is prevention: shield exposed locks from the worst of the weather where you can, and keep them lubricated before winter sets in. If a lock has already frozen, gently warming the key can melt the ice and soften the lubricant enough to get things moving. Take care, though, plenty of “tips” online involve heating the key with a flame, and metal gets hot enough to burn you fast. If it won’t free up easily, don’t force it, a forced key can snap in the lock and turn a small problem into a bigger one.
Hot Weather and Locks
Hot weather causes a sharp rise in lock problems, and UPVC doors are the most common culprit. When a plastic door heats up in direct sun it expands and can jam in its frame, so it won’t close or won’t lock until it cools down.
In the moment, the only real fix is to wait for the door to cool down and shrink back to size. Longer term, the answer is to keep the heat off it: shade the door from direct afternoon sun, or, for something like a porch door, make sure there’s enough ventilation that heat doesn’t build up behind the glass. If a particular door catches the sun and jams every summer, that’s a sign it’s worth looking at properly rather than living with it each year.
Metal locks and uPVC mechanisms feel the heat too: the lubricant dries out and the metal parts expand, which can leave the mechanism binding so the lock won’t turn. Keeping it lightly lubricated helps, but once the metal has expanded, there’s little to do but wait for it to cool and shrink back. If it keeps happening to the same door, shading it is the real fix.
Additionally, in winter, there are the long dark evenings and mornings to contend with which make it so much easier for opportunist burglars. If you are already checking your locks and security on a regular basis its worth ensuring that you have adequate lighting around the entrance to your property. Keep hedges trimmed so that they don’t provide shelter for anyone up to no good. Make sure that the Shed and garage that may not be used as much in the colder months are secure and that their locks are lubricated to keep out the damp.
If a door won’t lock or a key won’t turn and you’re not getting anywhere, call Tim direct on 07966 233092. You’ll get a straight answer on what it needs and how quickly he can get to you, with no call-out charge and the price agreed before any work starts. Local locksmith covering Buckinghamshire, Hertfordshire and Berkshire.
Lock Problems Caused by Weather FAQs
How does cold weather affect my locks?
Cold weather makes locks stiff in two ways: any moisture inside can freeze, and the lubricant thickens so the parts don’t slide as freely. You’ll feel it as a key that’s harder to turn, and in a hard frost the keyway can ice up completely. Don’t force a stiff key, it can snap. A bit of lubrication before winter, and shielding exposed locks from the worst of the weather, prevents most of these problems.
Can hot weather cause lock problems, too?
Yes. In the heat, metal parts expand and the lubricant dries out, which can leave a lock or mechanism binding so the key won’t turn. UPVC doors are the most common problem, the door itself expands and jams in the frame. The quickest fix is to wait for things to cool and shrink back. If the same door catches the sun and sticks every summer, shading it is the proper answer.
What role does rain or moisture play in lock performance?
Water is hard on locks. Once moisture gets into the mechanism it leads to rust and corrosion, and over time that makes a lock stiff or seizes it up altogether. Outdoor locks that aren’t protected, on gates, sheds and garages, suffer most. A quick check and a little lubrication now and then keeps water out and stops a small problem turning into a replacement.
Why should I check my locks seasonally?
A quick seasonal check lets you catch the early signs, a key that’s starting to stiffen, a lock that’s getting gritty, before they leave you locked out at the worst possible moment. Each season puts a different strain on a lock: damp and frost in winter, expansion and dried-out lubricant in summer. Two checks a year, with a little lubrication, is usually all it takes to keep everything working and your home secure.
When should I call a locksmith for weather-related lock issues?
If a lock keeps sticking, freezing or feels unusually stiff even after you’ve cleaned and lubricated it, it’s worth getting it looked at before the key snaps or you end up locked out. Call Tim on 07966 233092 and he’ll find out what’s really going on and sort it, and point you at weather-resistant locks or hardware if a particular door keeps causing trouble. No call-out charge, and the price is agreed before any work starts.