Climate Insights for Onex

The climate in Onex is temperate. The average annual temperature is 10°C and approximately 1644mm of precipitation falls per year. Onex receives a notable amount of rainfall throughout the year, including during its driest month. Onex is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -1°C. Onex experiences heavy snowfall, typically from January through December.

Temperatures in Onex vary considerably across the year, with a 26°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 25°C with a mean of 19°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 2°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Onex is a fairly wet location, receiving approximately 1644mm of precipitation annually, which averages out to around 137mm per month. The wettest month is December, averaging 190mm of rainfall. January and May also tend to see above-average precipitation. The driest month is September, with just 84mm. That's 106mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Onex receives heavy snowfall, accumulating around 255cm annually from January through December. The snowiest month is January, with approximately 63cm. Winter travel should account for significant snow cover.

Onex 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 February, 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 summer in Onex, which began on June 21, 2026. Onex 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 July at around 25°C, while the coldest stretch bottoms out in January near -1°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Onex is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 94mm per month. By contrast, January can be quite cold with temperatures dropping to -1°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Onex 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.