What is the hottest month in Gillette?

July is the warmest month in Gillette, with an average high of 86.4°F.

What is the coldest month in Gillette?

January is the coldest month in Gillette, with an average low of 15.8°F.

What month does Gillette get the most rain?

May is typically the wettest month in Gillette, with about 3.27 inches of precipitation.

What plant hardiness zone is Gillette in?

Gillette is approximately in USDA plant hardiness Zone 7a, based on the average annual extreme minimum temperature.

Has the climate in Gillette changed recently?

15% of Gillette's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Gillette, WY

Climate overview — based on NOAA 1991-2020 normals from GILLETTE 4SE, WY US.

Dfa Hot-summer humid continental climate 7a USDA hardiness Zone 7a

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Gillette has an annual average temperature of 46.8°F with about 17.6 inches of precipitation per year and 55.7 inches of snow. The warmest month is July (average high 86.4°F), and the coldest is January (average low 15.8°F). May is typically the wettest month (3.27 in) and January the driest (0.59 in). Snow typically falls from September through May.

Pleasant months

1 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

45.8°F

warmest to coldest month

Heating need

6,909

HDD/yr

Cooling need

369

CDD/yr

Best time to visit Gillette

Full guide →

Climate change signal

All-time records →

55 of 366 (15%) of Gillette's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1900s		17
1910s		24
1920s		34
1930s		40
1940s		21
1950s		39
1960s		23
1970s		20
1980s		28
1990s		20
2000s		24
2010s		39
2020s		37

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	36.2°F	15.8°F	26.0°F	0.59 in	8.2 in	8
February	37.6°F	16.8°F	27.2°F	0.78 in	9.0 in	8
March	48.7°F	24.8°F	36.7°F	1.13 in	8.6 in	8
April	56.4°F	31.7°F	44.1°F	2.13 in	9.4 in	11
May	65.9°F	41.0°F	53.4°F	3.27 in	1.3 in	13
June	77.0°F	50.2°F	63.6°F	2.54 in	0.1 in	10
July	86.4°F	57.0°F	71.7°F	1.68 in	—	8
August	85.4°F	55.7°F	70.6°F	1.38 in	—	6
September	75.3°F	46.4°F	60.8°F	1.25 in	0.5 in	6
October	59.2°F	34.4°F	46.8°F	1.57 in	4.4 in	8
November	46.2°F	24.1°F	35.2°F	0.63 in	5.8 in	6
December	35.8°F	16.1°F	25.9°F	0.64 in	8.4 in	7