Climate Insights for Hamilton

The climate in Hamilton is cool. The average annual temperature is 4°C and approximately 839mm of precipitation falls per year. February is the wettest month, receiving around 100mm of rainfall. Hamilton is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are December, January, February, when temperatures can drop to -12°C. Hamilton experiences heavy snowfall, typically from January through December.

Hamilton has a wide annual temperature range, spanning 38°C from the coldest to warmest months. The warmest month is August, when average highs reach 26°C and the mean temperature sits around 17°C. The coldest month is December, when overnight lows fall to -12°C and the daily average is -8°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.

Hamilton is a moderately rainy area, receiving approximately 839mm of precipitation annually, which averages out to around 70mm per month. The wettest month is February, averaging 100mm of rainfall. June and March also tend to see above-average precipitation. The driest month is August, with just 23mm. That's 76mm less than February, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Hamilton receives heavy snowfall, accumulating around 453cm annually from January through December. The snowiest month is February, with approximately 90cm. Winter travel should account for significant snow cover.

Hamilton is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.

It is currently spring in Hamilton, which began on March 20, 2026. Hamilton is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 26°C, while the coldest stretch bottoms out in December near -12°C. Summer is next, beginning on June 21, 2026 — 7 days from now.

The best time to visit Hamilton is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 29mm per month. By contrast, December can be quite cold with temperatures dropping to -12°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Hamilton based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.