Climate Insights for Ennis - Big Sky Airport

The climate in Ennis - Big Sky Airport is cool. The average annual temperature is 2°C and approximately 715mm of precipitation falls per year. Ennis - Big Sky Airport receives a notable amount of rainfall throughout the year, including during its driest month. Ennis - Big Sky Airport 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 December, February, January, when temperatures can drop to -11°C. Ennis - Big Sky Airport experiences heavy snowfall, typically from January through December.

Temperatures in Ennis - Big Sky Airport vary considerably across the year, with a 35°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 24°C with a mean of 16°C. The coldest month is December, when overnight lows fall to -11°C and the daily average is -8°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.

Ennis - Big Sky Airport is a relatively dry area, receiving approximately 715mm of precipitation annually, which averages out to around 60mm per month. The wettest month is May, averaging 104mm of rainfall. June and April also tend to see above-average precipitation. The driest month is January, with just 35mm. That's 68mm 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. Ennis - Big Sky Airport receives heavy snowfall, accumulating around 277cm annually from January through December. The snowiest month is April, with approximately 42cm. Winter travel should account for significant snow cover.

Ennis - Big Sky Airport is mildly breezy, with an average annual wind speed of 13km/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 14km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 12km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently spring in Ennis - Big Sky Airport, which began on March 20, 2026. Ennis - Big Sky 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 July at around 24°C, while the coldest stretch bottoms out in December near -11°C. Summer is next, beginning on June 21, 2026 — 86 days from now.

The best time to visit Ennis - Big Sky Airport is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 37mm per month. By contrast, December can be quite cold with temperatures dropping to -11°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 Ennis - Big Sky 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.