Hamilton weather in December
Long-run climate averages for Hamilton, Ontario in December, plus what the forecast models say for the days ahead.
In December, Hamilton averages 4°C by day and -2°C at night. The wettest month is usually July.
December in Hamilton averages a daytime high of 4°C and an overnight low of -2°C, which reads as cold for this part of the world. It is among the three coldest months of the year here. Overnight temperatures drop below freezing, so expect frost and pack accordingly. Across the whole year Hamilton sees roughly 1011 mm of precipitation.
Climate averages tell you what to pack. They do not tell you what next Tuesday looks like - for that, see the live Hamilton forecast with every model compared and how much they currently agree.
Hamilton weather by month
what to expect in Hamilton through the yearHere is Hamilton's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Hamilton by season.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Hamilton, scoring 94/100 on our CheckWeather Score, ahead of the American at 75. See the full CA accuracy scoreboard for exactly how every model is tested.
Common questions
How warm is Hamilton in December?
Is December a good time to visit Hamilton?
Does it rain a lot in Hamilton in December?
Climate averages from ERA5 reanalysis. Model accuracy re-scored over a rolling 30 days. Page updated .