Climate Insights for Casper

The climate in Casper is cool. The average annual temperature is 7°C and approximately 394mm of precipitation falls per year. Maggio is the wettest month, receiving around 70mm of rainfall. Casper is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Luglio, Agosto, Giugno. The coldest months are Gennaio, Febbraio, Dicembre, when temperatures can drop to -11°C. Snowfall occurs from January to December, with around 147cm accumulating over the season.

Casper has a wide annual temperature range, spanning 41°C from the coldest to warmest months. The warmest month is Luglio, when average highs reach 30°C and the mean temperature sits around 22°C. The coldest month is Gennaio, when overnight lows fall to -11°C and the daily average is -7°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.

Casper is a quite dry location, receiving approximately 394mm of precipitation annually, which averages out to around 33mm per month. The wettest month is May, averaging 70mm of rainfall. April and March also tend to see above-average precipitation. The driest month is July, with just 12mm. That's 59mm 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 147cm accumulating over the season. April typically sees the most snow at around 28cm.

Casper 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 June, averaging 23km/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 4km/h between the calmest and windiest months.

It is currently spring in Casper, which began on March 20, 2026. Casper 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 Luglio at around 30°C, while the coldest stretch bottoms out in Gennaio near -11°C. Summer is next, beginning on June 21, 2026 — 92 days from now.

The best time to visit Casper is during Giugno, Luglio, Agosto and Settembre, 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, Gennaio can be quite cold with temperatures dropping to -11°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Casper 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.