Weather in Glasgow in December

The month to avoid. December is the month most people should skip in Glasgow. Highs sit at 6.2 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

December ranks 11 of 12 — near the bottom of Glasgow's year. July is the month that works, and the swing between the two is 40 points, which is a different holiday rather than a slightly better one.

Rain on 20 of the month's 31 days, 4 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Layers, and a genuinely waterproof outer — at 6.2 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: 6 nights fall below freezing; the day barely swings — 3.6 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest December day reached 12.8 °C and the coldest night fell to -6.5 °C, and the wettest single day dropped 37 mm — roughly 28% of the month's rain in one day.

December is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest December on record still delivered 286 mm against 43 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 131 mm average is a reasonable planning figure, not a promise.

Wind is light at 14.1 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 95%, which at 6.2 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How December sits in the year

Temperatures hold steady either side: 8.5 °C in November, 6.2 here, 5.7 in January. Nothing about the timing within the month matters much.

Daylight in December

December sits at the dark end of Glasgow's year — 7 hours of daylight against 17.5 at midsummer, losing 0.5 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

Despite being inland, the year stays fairly even: 16.1 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

December in Glasgow versus nearby

If Glasgow is one option among several, the nearby comparison is worth making. Edinburgh is close enough to be a coin toss — within a degree on temperature, 4 days less rain. Manchester is close enough to be a coin toss — within a degree on temperature, 2 days less rain.

So: December is a compromise. July is 38 points better and is what Glasgow is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Glasgow

See all twelve months in Glasgow, or where else to go in December.