Casper weather by month & the best time to visit
United States · alpine / mountain town · hot-summer continental climate
The best time to visit Casper is August — its sunniest month (Sunshine Score 93/100), with July and September close behind. Casper averages about 3,022 hours of sunshine a year. Daytime highs around 30°C / 86°F and roughly 24 mm of rain in August.
When is the best time to visit Casper?
For sunshine, the best time to visit Casper is August, then July and September. The dullest month is January (0/100, 18 mm of rain). The full month-by-month picture is in the table below.
How sunny is Casper?
Casper is one of the sunniest places on Earth: about 3,022 hours of sunshine a year. 93 Sunshine Score points separate August (93) from January (0), so the month you pick matters. It ranks #81 of 580 destinations in United States for annual sunshine, above the national median of 2,279 hours. The year's 395 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV |
|---|---|---|---|---|---|
| January | 0 | 2° / 36°F | -9° / 16°F | 18 mm | 2 |
| February | 0 | 3° / 37°F | -8° / 18°F | 22 mm | 3 |
| March | 8 | 9° / 48°F | -4° / 25°F | 34 mm | 4 |
| April | 44 | 14° / 57°F | -1° / 30°F | 47 mm | 6 |
| May | 84 | 20° / 68°F | 5° / 41°F | 71 mm | 7 |
| June | 90 | 27° / 81°F | 11° / 52°F | 39 mm | 9 |
| July | 91 | 32° / 90°F | 16° / 61°F | 34 mm | 9 |
| August | 93 | 30° / 86°F | 15° / 59°F | 24 mm | 8 |
| September | 91 | 24° / 75°F | 9° / 48°F | 30 mm | 6 |
| October | 53 | 15° / 59°F | 1° / 34°F | 35 mm | 4 |
| November | 0 | 7° / 45°F | -4° / 25°F | 20 mm | 2 |
| December | 0 | 1° / 34°F | -9° / 16°F | 21 mm | 1 |
Nearest destinations
Casper: questions and answers
What kind of destination is Casper?
Casper is a alpine / mountain town in United States at 1,624 m elevation with a hot-summer continental climate.
How many hours of sunshine does Casper get a year?
Casper gets about 3,022 hours of sunshine a year, at its best around August.
When is the best time to visit Casper?
The sunniest time to visit Casper is August, when the Sunshine Score peaks at 93/100 (with July and September close behind). Expect daytime highs around 30°C / 86°F.
What is the least sunny month in Casper?
January is the least sunny month in Casper, scoring 0/100 with about 18 mm of rain.
How strong is the sun in Casper?
The typical midday UV index in Casper peaks around 9 (very high) in June, easing to about 1 (low) in December. Month-by-month midday UV values are in the UV column of the table on this page.
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