Climate Insights for Colstrip

The climate in Colstrip is cool. The average annual temperature is 9°C and approximately 415mm of precipitation falls per year. May is the wettest month, receiving around 64mm of rainfall. Colstrip 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 February, January, December, when temperatures can drop to -9°C. Snowfall occurs from January to December, with around 85cm accumulating over the season.

Colstrip has a wide annual temperature range, spanning 41°C from the coldest to warmest months. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 24°C. The coldest month is February, when overnight lows fall to -9°C and the daily average is -4°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 9°C shift in average temperatures.

Colstrip is a relatively dry area, receiving approximately 415mm of precipitation annually, which averages out to around 35mm per month. The wettest month is May, averaging 64mm of rainfall. April and June also tend to see above-average precipitation. The driest month is January, with just 18mm. That's 46mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 85cm accumulating over the season. February typically sees the most snow at around 16cm.

Colstrip is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in January, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently spring in Colstrip, which began on March 20, 2026. Colstrip 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 32°C, while the coldest stretch bottoms out in February near -9°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Colstrip is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 37mm per month. By contrast, February can be quite cold with temperatures dropping to -9°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Colstrip 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.