Climate Overview
The climate in Missoula International Airport is cool. The average annual temperature is 6°C and approximately 829mm of precipitation falls per year. February is the wettest month, receiving around 96mm of rainfall. Missoula International Airport 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 February, January, December, when temperatures can drop to -9°C. Missoula International Airport experiences heavy snowfall, typically from January through December.
Temperature
Missoula International Airport has a wide annual temperature range, spanning 36°C from the coldest to warmest months. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 18°C. The coldest month is February, when overnight lows fall to -9°C and the daily average is -5°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.
Precipitation
Missoula International Airport is a moderately rainy area, receiving approximately 829mm of precipitation annually, which averages out to around 69mm per month. The wettest month is February, averaging 96mm of rainfall. October and May also tend to see above-average precipitation. The driest month is August, with just 19mm. That's 77mm 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. Missoula International Airport receives heavy snowfall, accumulating around 359cm annually from January through December. The snowiest month is February, with approximately 75cm. Winter travel should account for significant snow cover.
Wind
Missoula International Airport 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 June, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, 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.
Seasons
4 days until Summer
It is currently spring in Missoula International Airport, which began on March 20, 2026. Missoula International Airport 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 27°C, while the coldest stretch bottoms out in February near -9°C. Summer is next, beginning on June 21, 2026 — 4 days from now.
Spring
Temperatures range from -4 to 17°C. Precipitation is moderate at around 260mm for the season, averaging 87mm per month. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 7 to 27°C. Rainfall is relatively light, with around 120mm over the season and a monthly average of 40mm. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -3 to 20°C. Precipitation is moderate at around 214mm for the season, averaging 71mm per month. Expect around 71cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -9 to 0°C. Precipitation is moderate at around 234mm for the season, averaging 78mm per month. Expect around 205cm of snow accumulation during this period. Winds are generally light, averaging 2km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Missoula International Airport is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 21mm per month. By contrast, February can be quite cold with temperatures dropping to -9°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Missoula International Airport 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.
