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Gillette, Wyoming climate

Dfa Hot-summer humid continental

Gillette has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 86°F, while the coldest is December averaging around 16°F at night. Precipitation totals about 18 inches a year and is strongly seasonal — May alone averages 3.3 inches while January barely receives 0.59 inches. Winters bring significant snowfall (56 inches of snow per year on average).

☀️ Summers

Warm

Highs near 86°F in July.

About 26 days a year above 90 °F

❄️ Winters

Very cold

Lows near 16°F in December.

About 166 freezing nights a year

🌧️ Rain & snow

Fairly dry

About 18 in of rain a year, plus 56 in of snow.

Snow falls through the winter months

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+1.8 °F vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Gillette climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	36	38	49	56	66	77	86	85	75	59	46	36
Avg temp (°F)	26	27	37	44	53	64	72	71	61	47	35	26
Avg low (°F)	16	17	25	32	41	50	57	56	46	34	24	16
Precipitation (in)	0.6	0.8	1.1	2.1	3.3	2.5	1.7	1.4	1.3	1.6	0.6	0.6
Snowfall (in)	8.2	9.0	8.6	9.4	1.3	0.1	—	—	0.5	4.4	5.8	8.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	36	38	49	56	66	77
Avg temp (°F)	26	27	37	44	53	64
Avg low (°F)	16	17	25	32	41	50
Precipitation (in)	0.6	0.8	1.1	2.1	3.3	2.5
Snowfall (in)	8.2	9.0	8.6	9.4	1.3	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	86	85	75	59	46	36
Avg temp (°F)	72	71	61	47	35	26
Avg low (°F)	57	56	46	34	24	16
Precipitation (in)	1.7	1.4	1.3	1.6	0.6	0.6
Snowfall (in)	—	—	0.5	4.4	5.8	8.4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	7	8	8	11	12	10	8	6	6	8	6	6
Days with high ≥ 90°F (days)	—	—	—	—	0.3	3	11	10	3	0.0	—	—
Days with low ≤ 32°F (days)	28	26	24	17	5	0.1	—	—	2	13	24	28
Days with snowfall ≥ 1 in (days)	3	3	3	2	0.4	0.1	—	—	0.2	2	2	3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	7	8	8	11	12	10
Days with high ≥ 90°F (days)	—	—	—	—	0.3	3
Days with low ≤ 32°F (days)	28	26	24	17	5	0.1
Days with snowfall ≥ 1 in (days)	3	3	3	2	0.4	0.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	8	6	6	8	6	6
Days with high ≥ 90°F (days)	11	10	3	0.0	—	—
Days with low ≤ 32°F (days)	—	—	2	13	24	28
Days with snowfall ≥ 1 in (days)	—	—	0.2	2	2	3

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	66	67	66	67	64	54	44	45	48	59	63	66
Clear days (≤ 30% cloud)	4	3	4	4	5	7	11	11	11	7	5	4
Partly cloudy days (30–70%)	12	10	11	10	11	13	14	13	10	10	10	12
Cloudy days (≥ 70%)	16	15	16	16	15	10	6	7	9	14	15	15
Relative humidity (%)	73	68	62	60	57	54	47	44	47	58	65	72
Wind speed (mph)	7.5	7.9	7.8	7.8	7.4	6.8	6.4	6.6	6.9	7.4	7.0	7.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	66	67	66	67	64	54
Clear days (≤ 30% cloud)	4	3	4	4	5	7
Partly cloudy days (30–70%)	12	10	11	10	11	13
Cloudy days (≥ 70%)	16	15	16	16	15	10
Relative humidity (%)	73	68	62	60	57	54
Wind speed (mph)	7.5	7.9	7.8	7.8	7.4	6.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	44	45	48	59	63	66
Clear days (≤ 30% cloud)	11	11	11	7	5	4
Partly cloudy days (30–70%)	14	13	10	10	10	12
Cloudy days (≥ 70%)	6	7	9	14	15	15
Relative humidity (%)	47	44	47	58	65	72
Wind speed (mph)	6.4	6.6	6.9	7.4	7.0	7.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Gillette 3se (NOAA GHCN station USC00483855), about 5 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →