Climate Insights for Stephenville

The climate in Stephenville is cool. The average annual temperature is 6°C and approximately 1450mm of precipitation falls per year. Stephenville receives a notable amount of rainfall throughout the year, including during its driest month. Stephenville is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to -8°C. Stephenville experiences heavy snowfall, typically from January through December.

Temperatures in Stephenville vary considerably across the year, with a 29°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 21°C with a mean of 18°C. The coldest month is February, when overnight lows fall to -8°C and the daily average is -6°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between May and June, with a 6°C shift in average temperatures.

Stephenville is a fairly wet location, receiving approximately 1450mm of precipitation annually, which averages out to around 121mm per month. The wettest month is November, averaging 155mm of rainfall. October and February also tend to see above-average precipitation. The driest month is May, with just 94mm. That's 61mm less than November, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Stephenville receives heavy snowfall, accumulating around 303cm annually from January through December. The snowiest month is February, with approximately 73cm. Winter travel should account for significant snow cover.

Stephenville is moderately windy, with an average annual wind speed of 23km/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 27km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 9km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 27km/h in winter, 23km/h in spring, 19km/h in summer, 24km/h in autumn.

It is currently spring in Stephenville, which began on March 20, 2026. Stephenville 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 21°C, while the coldest stretch bottoms out in February near -8°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The table below shows monthly climate averages for Stephenville 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.