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.
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- Sun hours / year
- 3,022
- Sunniest month
- August
- Peak score
- 93/100
- Rain / year
- 395 mm
- Snow / year
- ≈1.4 m
- Midday UV at peak
- 9 (very high)
- Population
- 60k
- Elevation
- 1,624 m
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 |
See Casper on the interactive sunshine globe →
Nearby places for sunshine
- Hayden United States · 277 km · best in Jun · 3,058 h sun/yr
- Rapid City United States · 302 km · best in Sep · 2,793 h sun/yr
- Jackson Hole United States · 355 km · best in Jul · 2,836 h sun/yr
- Billings United States · 362 km · best in Jul · 2,701 h sun/yr
- Eagle United States · 365 km · best in Jun · 3,154 h sun/yr
- Denver United States · 370 km · best in Sep · 3,169 h sun/yr
Nearest destinations
- Riverton United States · 163 km · 3,100 h sun/yr · best in Jul
- Gillette United States · 177 km · 2,808 h sun/yr · best in Aug
- Laramie United States · 189 km · 2,979 h sun/yr · best in Aug
- Sheridan United States · 211 km · 2,830 h sun/yr · best in Jul
- Cheyenne United States · 238 km · 2,982 h sun/yr · best in Sep
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