Gillette, WY weather in May
Expect mild weather with frequent rain in Gillette in May, with highs near 66°F and lows near 41°F. Rain or snow falls on about 13 days. Snowfall averages about 1.3 in.
- Normal high
- 66°F
- Normal low
- 41°F
- Wet days
- 13
- 3.3 in total
- Snowfall
- 1.3 in
- normal snowfall
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 60°F | 72°F |
| Normal low | 35°F | 46°F |
| Chance of a wet day | 39% | 41% |
| Sunrise / sunset | 5:52 am / 8:05 pm | 5:21 am / 8:37 pm |
| Daylight | 14.2 h | 15.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical May day
- 6 am46°Fdew point 38°F
- 9 am55°Fdew point 39°F
- Noon60°Fdew point 38°F
- 3 pm62°Fdew point 38°F
- 6 pm59°Fdew point 39°F
- 9 pm48°Fdew point 39°F
NOAA hourly normals (local standard time) from Gillette Campbell Airport (4 mi away); average wind 11 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)14 of 31
- Hot dayshigh 90°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow13 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below6 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain and snow in May
Normal precipitation is 3.3 in; a dry May brings about 1.9 in and a wet one about 4.3 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more. Normal snowfall is 1.3 in, with about 1 day of an inch or more.
How May varies from year to year
- Warmest May, 1991-20202018: average high 72°F
- Coolest May1995: average high 58°F
- Wettest May2007: 8.1 in
- Driest May2009: 0.6 in
- Highest reading92°F (May 16, 2012)
- Lowest reading14°F (May 2, 2005)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 56°F | 66°F | 77°F |
| Normal low | 32°F | 41°F | 50°F |
| Wet days | 11 | 13 | 10 |
| Comfortable days | 8 | 14 | 16 |
| Daylight | 13.5 h | 14.8 h | 15.5 h |
Highs change by +10°F from April and +11°F into June.
Nearby alternatives in May
- Cooler: Keystone, SD107 mi · high 60°F · 13 wet days
How Gillette ranks in May
- Normal high330th warmest of 378 cities; 2nd of 4 in Wyoming
- Wet days305th driest of 378
What to pack for Gillette in May
- Layers – afternoons near 66°F but nights near 41°F
- A rain jacket or umbrella – rain or snow on about 13 days
Frost in May
The last spring frost typically comes around May 22; in 1 year in 10 it comes after Jun 4. All frost dates for Gillette.
Heating and cooling
May has 369 heating degree days and 11 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How cold is Gillette in May?
The normal high is 66°F and the normal low is 41°F. From 1991 to 2020 the coldest May reading was 14°F (May 2, 2005).
Does it rain a lot in Gillette in May?
About 13 days in May have at least 0.01 in of precipitation, and the normal total is 3.3 in. The wettest May in 1991-2020 was in 2007 (8.1 in); the driest was in 2009 (0.6 in).
Does it snow in Gillette in May?
Yes. Normal snowfall in May is 1.3 in.
Is May a good time to visit Gillette?
May ranks 2nd of 12 months on our comfort score for Gillette (71 out of 100). It has about 14 comfortable days (judged by temperature only). The best months are May and June.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Gillette 4SE (USC00483855), 3.1 mi ESE of the city center, 4,640 ft (86 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Frost dates and humidity and wind by hour: Gillette Campbell Airport (USW00094023), 3.9 mi NNW of the city center, 4,354 ft (200 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).