Gillette Climate by Month
Gillette, Wyoming, United States
Hot summers and cold winters, with rain spread through the year.
Hot summers and cold winters, with rain spread through the year: that's Gillette's climate in short. Expect highs of 87°F (31°C) in July and 37°F (3°C) in December, with the coldest nights (January) near 14°F (-10°C). About 15 in (387 mm) of rain falls in a typical year, with no clear rainy season.
- Warmest month
- 87°F(31°C)
- Average high, July
- Coldest nights
- 14°F(-10°C)
- Average low, January
- Rain per year
- 15 in(387 mm)
- No clear rainy season
- Humidity
- 53%
- Sunniest: July
Best and worst months in Gillette
Best for weatherSeptember is the best time for weather in Gillette: highs near 75°F (24°C) and about 1.3 in (32 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 37°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Gillette weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 14°F(-10°C) | 0.4 in(10 mm) | 64% | 1.7 |
| FebFebruary | 39°F(4°C) | 15°F(-9°C) | 0.6 in(15 mm) | 60% | 2.6 |
| MarMarch | 49°F(10°C) | 23°F(-5°C) | 0.7 in(18 mm) | 55% | 3.9 |
| AprApril | 57°F(14°C) | 30°F(-1°C) | 1.7 in(42 mm) | 53% | 4.7 |
| MayMay | 65°F(18°C) | 39°F(4°C) | 3.1 in(80 mm) | 53% | 5.8 |
| JunJune | 76°F(24°C) | 48°F(9°C) | 3.1 in(79 mm) | 53% | 6.5 |
| JulJuly | 87°F(31°C) | 55°F(13°C) | 1.3 in(33 mm) | 43% | 7.1 |
| AugAugust | 85°F(29°C) | 54°F(12°C) | 1.2 in(30 mm) | 41% | 6.0 |
| SepSeptemberBest | 75°F(24°C) | 44°F(7°C) | 1.3 in(32 mm) | 47% | 4.6 |
| OctOctober | 59°F(15°C) | 32°F(0°C) | 1.1 in(27 mm) | 48% | 2.9 |
| NovNovember | 47°F(8°C) | 22°F(-6°C) | 0.4 in(10 mm) | 60% | 1.9 |
| DecDecember | 37°F(3°C) | 15°F(-10°C) | 0.4 in(11 mm) | 63% | 1.5 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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