Climate Insights for Greybull

The climate in Greybull is cool. The average annual temperature is 9°C and approximately 320mm of precipitation falls per year. May is the wettest month, receiving around 55mm of rainfall. Greybull 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 -9°C. Snowfall occurs from January to December, with around 83cm accumulating over the season.

Greybull 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 December, when overnight lows fall to -9°C and the daily average is -4°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 9°C shift in average temperatures.

Greybull is a quite dry location, receiving approximately 320mm of precipitation annually, which averages out to around 27mm per month. The wettest month is May, averaging 55mm of rainfall. September and April also tend to see above-average precipitation. The driest month is July, with just 10mm. That's 46mm less than May, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 83cm accumulating over the season. February typically sees the most snow at around 18cm.

Greybull 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 April, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, 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 1km/h between the calmest and windiest months.

It is currently spring in Greybull, which began on March 20, 2026. Greybull 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 December near -9°C. Summer is next, beginning on June 21, 2026 — 7 days from now.

The best time to visit Greybull 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 24mm per month. By contrast, December can be quite cold with temperatures dropping to -9°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Greybull 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.