Climate averages 1991–2020
Waterloo weather
in December.
A cold month with moderate precipitation: the 10th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Waterloo: daytime highs average 0.6°C and nights cool to about -5.8°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 65 mm of precipitation on roughly 12 days, which makes December a month with moderate precipitation (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 01 min on an average December day.
The nearest other city in this atlas is Kitchener (5 km away). In December its highs average 0.7°C, about as warm as Waterloo, with 65 mm of precipitation.
Among the 86 cities listed in Canada, Waterloo ranks joint 45th of 86 for the warmest December highs and joint 31st of 86 for the driest December (precipitation, lowest first). The mean December high of those 86 cities is 0.2°C; Waterloo is 0.4°C warmer than that mean.
From December to January, average highs fall by 3.0°C to -2.4°C, and monthly precipitation rises from 65 mm to 68 mm.
The annual picture
December in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Waterloo climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.4°C-10.4°C | -10.4°C | 68 | 11.5 | 9.49 h |
| February | -1.4°C-10.9°C | -10.9°C | 55 | 9.2 | 10.510 h |
| March | 4.0°C-5.8°C | -5.8°C | 63 | 10.0 | 11.912 h |
| April | 11.1°C0.8°C | 0.8°C | 86 | 11.8 | 13.413 h |
| May | 18.3°C7.8°C | 7.8°C | 88 | 11.6 | 14.715 h |
| June | 23.2°C13.5°C | 13.5°C | 94 | 11.4 | 15.415 h |
| July | 25.4°C16.1°C | 16.1°C | 85 | 11.0 | 15.115 h |
| August | 24.4°C15.5°C | 15.5°C | 76 | 9.9 | 14.014 h |
| September | 20.6°C11.9°C | 11.9°C | 79 | 9.5 | 12.613 h |
| October | 13.4°C5.7°C | 5.7°C | 80 | 11.3 | 11.111 h |
| November | 6.3°C-0.4°C | -0.4°C | 74 | 11.2 | 9.710 h |
| December, selected | 0.6°C-5.8°C | -5.8°C | 65 | 11.5 | 9.09 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Kitchener in DecemberCanada · 5 kmHigh 0.7°C · Low -5.9°C · 65 mm precipitation
- Cambridge, Canada in DecemberCanada · 20 kmHigh 1.1°C · Low -5.4°C · 63 mm precipitation
- Guelph in DecemberCanada · 23 kmHigh 0.6°C · Low -5.9°C · 63 mm precipitation
- Brantford in DecemberCanada · 42 kmHigh 1.9°C · Low -4.5°C · 63 mm precipitation
- Milton in DecemberCanada · 51 kmHigh 1.8°C · Low -4.0°C · 62 mm precipitation
- Burlington in DecemberCanada · 56 kmHigh 2.0°C · Low -3.3°C · 70 mm rain
- Hamilton in DecemberCanada · 59 kmHigh 2.5°C · Low -2.5°C · 71 mm rain
- Caledon in DecemberCanada · 61 kmHigh -0.1°C · Low -6.5°C · 61 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Waterloo) is explained once on the Waterloo year overview and on the Sources, method and limits page.
Kitchener lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.