Cheyenne, Wyoming climate: Normal weather by month, frost dates and records
Cheyenne's normal year runs from 18°F December nights to 84°F July afternoons, with 15.4 inches of precipitation and 63 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.3°C, December lows of −8°C, July highs of 29°C, 391 mm of precipitation a year.
- NOAA stationCheyenne Weather Office Airport
- Station IDUSW00024018
- Location41.15°N 104.81°W
- Elevation6,128 ft (1,868 m)
- Population65,704
On October 22, the normal high in Cheyenne is 57°F and the normal low 32°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Cheyenne.
- Jan 40° 18°
- Feb 41° 18°
- Mar 49° 25°
- Apr 55° 31°
- May 64° 40°
- Jun 77° 49°
- Jul 84° 56°
- Aug 82° 54°
- Sep 73° 46°
- Oct 59° 34°
- Nov 48° 25°
- Dec 39° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Cheyenne each month?
July is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 18°F. The most precipitation falls in May (2.44 in), the least in January (0.35 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 40°F | 18°F | 29.2°F | 0.35 | 6.3 | 5 | <1 | 29 | 9 h 30 min |
| February | 41°F | 18°F | 29.5°F | 0.52 | 9.0 | 7 | <1 | 26 | 10 h 40 min |
| March | 49°F | 25°F | 37.1°F | 0.96 | 9.7 | 8 | <1 | 25 | 11 h 50 min |
| April | 55°F | 31°F | 42.8°F | 1.79 | 11.3 | 11 | <1 | 18 | 13 h 20 min |
| May | 64°F | 40°F | 52.3°F | 2.44 | 3.4 | 13 | <1 | 5 | 14 h 30 min |
| June | 77°F | 49°F | 63.1°F | 2.16 | 0.0 | 11 | 2 | <1 | 15 h 10 min |
| July | 84°F | 56°F | 70.1°F | 2.11 | 0.0 | 11 | 8 | <1 | 14 h 50 min |
| August | 82°F | 54°F | 68.1°F | 1.52 | 0.0 | 10 | 4 | <1 | 13 h 50 min |
| September | 73°F | 46°F | 59.6°F | 1.47 | 1.0 | 7 | 1 | 1 | 12 h 30 min |
| October | 59°F | 34°F | 46.5°F | 1.00 | 5.9 | 7 | <1 | 13 | 11 h 10 min |
| November | 48°F | 25°F | 36.1°F | 0.61 | 7.5 | 6 | <1 | 24 | 10 h |
| December | 39°F | 18°F | 28.7°F | 0.48 | 8.8 | 6 | <1 | 29 | 9 h 10 min |
| Year (annual) | 59°F | 35°F | 46.9°F | 15.41 | 62.9 | 102 | 15 | 170 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −8°C | −1.6°C | 9 mm | 16 cm |
| February | 5°C | −8°C | −1.4°C | 13 mm | 23 cm |
| March | 10°C | −4°C | 2.8°C | 24 mm | 25 cm |
| April | 13°C | −1°C | 6.0°C | 45 mm | 29 cm |
| May | 18°C | 5°C | 11.3°C | 62 mm | 9 cm |
| June | 25°C | 10°C | 17.3°C | 55 mm | 0 cm |
| July | 29°C | 13°C | 21.2°C | 54 mm | 0 cm |
| August | 28°C | 12°C | 20.1°C | 39 mm | 0 cm |
| September | 23°C | 8°C | 15.3°C | 37 mm | 3 cm |
| October | 15°C | 1°C | 8.1°C | 25 mm | 15 cm |
| November | 9°C | −4°C | 2.3°C | 15 mm | 19 cm |
| December | 4°C | −8°C | −1.8°C | 12 mm | 22 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024018; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Cheyenne?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September has the fewest days with rain (7).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024018.
When is the last frost in Cheyenne?
In Cheyenne, the last spring frost (32°F) comes after May 12 in half of years and after May 26 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 18 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 121 year in 10 after May 26; 9 in 10 after May 1
- First autumn frost, half of years before
- October 11 year in 10 before September 18; 9 in 10 before October 14
NOAA puts the median frost-free season at 141 days, and the season without a hard freeze (28°F) at 161 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Cheyenne in zone 5b in ZIP code 82001. By the map's own method, the average of each year's coldest night over 1991-2020, Cheyenne's NOAA station is in zone 5b: the coldest night of a typical year reaches −13°F (30 complete years).
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00024018; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Cheyenne?
In a normal year in Cheyenne, 15 days a year reach 90°F, 170 nights fall to 32°F or colder and 102 days bring measurable precipitation.
- Days at 90°F or more
- 15a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 170a normal year
- Days that stay below freezing
- 33high of 32°F or less
- Days with 0.01 inch of precipitation
- 102a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in Cheyenne's official record (kept by the National Weather Service since 1872) is 100°F, on June 23, 1954; the lowest is −38°F, on January 9, 1875.
The wettest calendar year on that record is 1942, with 23.69 in; the snowiest season is 1979–80, with 121.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00024018; records: ACIS (NOAA Regional Climate Centers), NWS threaded record CYSthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Cheyenne, and how clear are its skies?
The summer (June-August) dew point averages 45°F. The muggiest month is July, with an average dew point of 48°F; the driest air comes in December (12°F). December is the windiest month (13.8 mph on average), and June has the most clear or nearly clear hours (77%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 13°F | 52% | 38% | 13.7 mph | 69% | 19% |
| February | 14°F | 50% | 34% | 13.6 mph | 67% | 21% |
| March | 21°F | 50% | 32% | 13.4 mph | 60% | 24% |
| April | 29°F | 52% | 34% | 12.5 mph | 56% | 27% |
| May | 40°F | 54% | 37% | 11.0 mph | 60% | 21% |
| June | 44°F | 45% | 28% | 10.1 mph | 77% | 8% |
| July | 48°F | 50% | 32% | 9.4 mph | 72% | 11% |
| August | 42°F | 46% | 27% | 9.7 mph | 75% | 10% |
| September | 33°F | 48% | 30% | 10.7 mph | 73% | 15% |
| October | 22°F | 50% | 35% | 12.4 mph | 70% | 20% |
| November | 14°F | 49% | 38% | 13.7 mph | 73% | 17% |
| December | 12°F | 51% | 41% | 13.8 mph | 72% | 17% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024018. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Cheyenne?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Cheyenne, 4.6 kWh per square metre a day. August is the sunniest month (83%) and April the cloudiest (72%). Among the 459 U.S. places of 50,000 or more, that ranks tied 210th (with 32 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 77% | 2.3 |
| February | 75% | 3.2 |
| March | 76% | 4.5 |
| April | 72% | 5.4 |
| May | 73% | 6.1 |
| June | 81% | 7.1 |
| July | 83% | 6.9 |
| August | 83% | 6.1 |
| September | 83% | 5.0 |
| October | 78% | 3.6 |
| November | 78% | 2.5 |
| December | 75% | 2.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Cheyenne need?
A normal year in Cheyenne brings 6,959 heating degree days, 30% more than the median U.S. place (5,373), and 399 cooling degree days, 56% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,163 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,110 | 0 |
| February | 994 | 0 |
| March | 865 | 0 |
| April | 666 | 0 |
| May | 398 | 4 |
| June | 115 | 56 |
| July | 17 | 175 |
| August | 33 | 130 |
| September | 196 | 32 |
| October | 574 | 1 |
| November | 867 | 0 |
| December | 1,125 | 0 |
| Year (annual) | 6,959 | 399 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00024018. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Cheyenne been warmer than normal lately?
2025 averaged 48.4°F, 1.5°F above the 1991-2020 normal of 46.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 48.1°F | +1.2°F | 14.22 | 68.8 |
| 2022 | 47.4°F | +0.5°F | 9.47 | 64.1 |
| 2023 | 47.4°F | +0.5°F | 20.37 | 59.1 |
| 2024 | 49.2°F | +2.3°F | 10.33 | 36.6 |
| 2025 | 48.4°F | +1.5°F | 15.39 | 35.1 |
Over 142 complete years from 1875 to 2025, the station's annual mean temperature rose at a fitted 2.7°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00024018; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Cheyenne's climate compare?
Cheyenne is warmer than 57 of the other 70 places with their own NOAA record in Wyoming, and wetter than 47. Across the 7,247 U.S. stations with normals, its annual mean of 46.9°F is warmer than 27%.
In the Köppen classification computed from these normals, Cheyenne is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Cheyenne share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Ranchettes, WY6,389 people · 5 mi N
- South Greeley, WY4,596 people · 4 mi S
- Fox Farm-College, WY4,224 people · 3 mi S
- Warren AFB, WY2,734 people · 3 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Cheyenne's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Cheyenne. This page uses Cheyenne Weather Office Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Cheyenne Weather Office USC00481676 | in town | 6,119 ft | 46.6°F | 18°F | 83°F | 16.0 | 66 | May 14 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Cheyenne's climate
What is the coldest month in Cheyenne?
December, with a normal high of 39°F and a normal low of 18°F. The warmest is July (84°F by day, 56°F at night).
Does it snow in Cheyenne?
Yes: 63 inches in a normal year, falling on 45 days with 0.1 inch or more, the most in April (11.3 inches).
What is the rainiest month in Cheyenne?
May, with 2.44 in of precipitation in a normal year; the driest is January with 0.35 in.
What plant hardiness zone is Cheyenne in?
The USDA's 2023 map puts Cheyenne in zone 5b in ZIP code 82001. By the same method at Cheyenne's NOAA station, the coldest night of a typical year reaches −13°F (30 years, 1991-2020): zone 5b.
How late can frost come in Cheyenne?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 26. Waiting until May 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Cheyenne in OctoberThis month day by day, its records and recent years
- Wyoming climateThe statewide normals and every place in the state
- Archer, WY7 miles from this station, 46.7°F a year
- Hecla (1 mi E), WY19 miles from this station, 45.0°F a year
- Carpenter, WY23 miles from this station, 46.9°F a year
- Nunn, CO24 miles from this station, 47.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made