Gillette weather in May

In May, Gillette sees average daytime highs of 64°F and overnight lows near 42°F, with 3.1 in of precipitation across 11.5 wet days and about 14.5 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 59°F in the first days to 69°F by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 54 min at the start of May to 15 hours by month's end. Set against the rest of the year, May is Gillette's 11th-clearest and 8th-windiest month. For the whole year in context, see Gillette's year-round climate.

Daytime high
64°
5th warmest
Overnight low
42°
8th coldest
Precipitation
3.1 in
11.5 wet days
Daylight
14 h 36 min
4:41 AM – 7:15 PM
Cloud cover
62%
11th clearest
Wind
11 mph
8th windiest
Solar energy
6.44 kWh/m²
Travel score
5.4
out of 10

Gillette is city in Campbell County, Wyoming, United States.

Density
664/km²
people per km²
Founded
1892

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 59°F in the first days to 69°F by the end.

A typical May day in Gillette reaches about 64°F in the afternoon and slips back to 42°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 79°F. Set against its neighbours, May runs about 10°F warmer than April and about 11°F cooler than June.

20°40°60°80°151015202531
Avg high (°F)Avg low (°F)
15837
25837
35938
45938
56038
66039
76039
86140
96140
106240
116241
126341
136342
146342
156442
166443
176543
186543
196544
206544
216644
226645
236745
246745
256746
266746
276846
286847
296947
306947
316947

How May really feels in Gillette

Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 7 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
7
wind chill below the day's low

The story in May is cold — wind chill drags the overnight "feels like" below the raw low.

Gillette weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan34° / 16°0.65.25.59.10.0
Feb37° / 18°0.85.85.710.20.0
Mar47° / 26°1.47.85.811.61.5
Apr54° / 33°2.410.85.413.23.2
May64° / 42°3.111.51.214.55.4
Jun75° / 52°2.310.20.115.36.8
Jul85° / 59°1.47.90155.7
Aug84° / 58°1.25.8013.86.5
Sep72° / 48°1.460.512.37.4
Oct56° / 36°1.97.83.110.84.3
Nov44° / 25°0.854.89.40.9
Dec35° / 18°0.75.15.18.70.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 20% of May, with mostly cloudy or overcast conditions the remaining 55%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24357
34357
44456
54555
64555
74555
84456
94555
104555
114555
124555
134456
144456
154357
164357
174357
184357
194357
204258
214456
224456
234555
244555
254654
264654
274654
284852
294951
305050
315149

Chance of precipitation in May

Any precipitationSnow

Gillette gets around 3.1 in of rain and snow over 11.5 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 39% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13912
23912
33911
43911
53810
6389
7389
8378
9377
10377
11376
12376
13375
14375
15374
16384
17383
18383
19382
20382
21382
22381
23381
24381
25381
26381
27381
28381
29381
30380
31380

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
28991
29991
30991
31991

Wind in May

Winds average 11 mph in May.

Across May, daily wind ranges from about 11 mph on the calmest days to 12 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
911light breeze
1011light breeze
1111light breeze
1211light breeze
1311light breeze
1411light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2411light breeze
2511light breeze
2611light breeze
2711light breeze
2811light breeze
2911light breeze
3011light breeze
3111light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 54 min at the start of May to 15 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over May. Sunrise moves from 5:01 AM to 4:28 AM, and sunset from 6:58 PM to 7:31 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.95:016:58
214.04:596:59
314.04:587:00
414.14:567:01
514.14:557:03
614.24:547:04
714.24:527:05
814.34:517:06
914.34:497:07
1014.34:487:09
1114.44:477:10
1214.44:467:11
1314.54:447:12
1414.54:437:13
1514.54:427:14
1614.64:417:15
1714.64:407:17
1814.64:397:18
1914.74:387:19
2014.74:377:20
2114.84:367:21
2214.84:357:22
2314.84:347:23
2414.84:337:24
2514.94:327:25
2614.94:327:26
2714.94:317:27
2815.04:307:28
2915.04:297:29
3015.04:297:30
3115.04:287:31

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.44 kWh/m².

For context, solar energy here swings from a low near 1.87 kWh/m² to a high of 7.4 kWh/m² in July across the year — May's 6.44 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.1Intense
36.2Intense
46.2Intense
56.2Intense
66.2Intense
76.3Intense
86.3Intense
96.3Intense
106.3Intense
116.3Intense
126.4Intense
136.4Intense
146.4Intense
156.4Intense
166.4Intense
176.4Intense
186.5Intense
196.5Intense
206.5Intense
216.5Intense
226.5Intense
236.5Intense
246.6Intense
256.6Intense
266.6Intense
276.6Intense
286.7Intense
296.7Intense
306.7Intense
316.8Intense
Planning a trip in May

Is May a good time to visit Gillette?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.4
Sightseeing
5th-best month of the year
1.8
Beach & pool
5th-best month of the year

May is a reasonable time to visit Gillette for sightseeing.

What to pack for Gillette in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Gillette sees daytime highs around 64°F and nights near 42°F. Pack sun protection. Worth having: a warm layer and rain gear. About 12 days see rain.

sun protectiona warm layerrain gear

UV index in Gillette in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gillette peaks around June 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 18UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar4Moderate
Apr5High
May7High
Jun9Very high
Jul8Very high
Aug7High
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Gillette in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Gillette is worst in August — around 20 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (December, 8 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 2220 µg/m³Dec 188 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb9Good
Mar12Moderate
Apr12Good
May13Moderate
Jun13Moderate
Jul15Moderate
Aug20Moderate
Sep20Moderate
Oct14Moderate
Nov11Good
Dec8Good
Location & terrain

Where is Gillette?

Gillette sits at 44.3°N, 105.5°W, 4,554 ft above sea level, in United States. The nearest listed city is Sheridan, 80 mi away.

Topography around Gillette

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Gillette.

Within 2 miles, the terrain around Gillette has only modest variations in elevation — a maximum elevation change of 348 ft around an average of 4,564 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,014 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,707 ft.

The land around Gillette is covered by grassland (50%) and artificial surfaces (35%) within 2 miles, grassland (91%) within 10 miles, and grassland (94%) within 50 miles.

2 miles
348 ft
10 miles
1,014 ft
50 miles
2,707 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Sheridan 80 mi · Casper 106 mi · Rapid City 114 mi · Billings 179 mi · Laramie 206 mi · Cheyenne 221 mi · Dickinson 222 mi · Fort Collins 257 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Gillette (44.2911°, -105.5022°, elevation 4,554 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).