Weston (1 mi E), Wyoming climate: Climate normals at a NOAA weather station
Weston (1 mi E)'s normal year runs from 10°F January nights to 87°F July afternoons, with 14.5 inches of precipitation and 41 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.5°C, January lows of −12°C, July highs of 31°C, 369 mm of precipitation a year.
- NOAA stationWeston (1 mi E)
- Station IDUSC00489580
- Location44.64°N 105.30°W
- Elevation3,738 ft (1,139 m)
On October 23, the normal high in Weston (1 mi E) is 56°F and the normal low 28°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Weston (1 mi E).
- Jan 37° 10°
- Feb 39° 13°
- Mar 51° 22°
- Apr 57° 30°
- May 66° 39°
- Jun 78° 48°
- Jul 87° 54°
- Aug 87° 52°
- Sep 76° 42°
- Oct 60° 31°
- Nov 47° 19°
- Dec 37° 11°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Weston (1 mi E) each month?
July is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 10°F. The most precipitation falls in June (2.60 in), the least in January (0.36 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 10°F | 23.5°F | 0.36 | 6.3 | 3 | <1 | 31 | 9 h 10 min |
| February | 39°F | 13°F | 25.7°F | 0.46 | 5.9 | 3 | <1 | 27 | 10 h 20 min |
| March | 51°F | 22°F | 36.7°F | 0.59 | 5.6 | 4 | <1 | 27 | 11 h 50 min |
| April | 57°F | 30°F | 43.5°F | 1.58 | 5.7 | 7 | <1 | 18 | 13 h 30 min |
| May | 66°F | 39°F | 52.6°F | 2.59 | 1.0 | 9 | <1 | 7 | 14 h 50 min |
| June | 78°F | 48°F | 63.0°F | 2.60 | 0.0 | 8 | 4 | <1 | 15 h 30 min |
| July | 87°F | 54°F | 70.8°F | 2.01 | 0.0 | 7 | 14 | <1 | 15 h 20 min |
| August | 87°F | 52°F | 69.3°F | 1.22 | 0.0 | 4 | 13 | <1 | 14 h 10 min |
| September | 76°F | 42°F | 59.3°F | 1.05 | 0.4 | 4 | 5 | 3 | 12 h 40 min |
| October | 60°F | 31°F | 45.2°F | 1.33 | 3.0 | 5 | <1 | 18 | 11 h |
| November | 47°F | 19°F | 33.1°F | 0.38 | 5.3 | 3 | <1 | 28 | 9 h 40 min |
| December | 37°F | 11°F | 23.6°F | 0.36 | 8.2 | 3 | <1 | 30 | 8 h 50 min |
| Year (annual) | 60°F | 31°F | 45.5°F | 14.53 | 41.4 | 59 | 36 | 188 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −12°C | −4.7°C | 9 mm | 16 cm |
| February | 4°C | −11°C | −3.5°C | 12 mm | 15 cm |
| March | 11°C | −5°C | 2.6°C | 15 mm | 14 cm |
| April | 14°C | −1°C | 6.4°C | 40 mm | 14 cm |
| May | 19°C | 4°C | 11.4°C | 66 mm | 3 cm |
| June | 26°C | 9°C | 17.2°C | 66 mm | 0 cm |
| July | 31°C | 12°C | 21.6°C | 51 mm | 0 cm |
| August | 30°C | 11°C | 20.7°C | 31 mm | 0 cm |
| September | 25°C | 6°C | 15.2°C | 27 mm | 1 cm |
| October | 16°C | −1°C | 7.3°C | 34 mm | 8 cm |
| November | 8°C | −7°C | 0.6°C | 10 mm | 13 cm |
| December | 3°C | −12°C | −4.7°C | 9 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00489580; 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.
Which months are mildest at Weston (1 mi E)?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (4).
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 USC00489580.
When is the last frost at Weston (1 mi E)?
In Weston (1 mi E), the last spring frost (32°F) comes after May 23 in half of years and after June 5 in one year in ten; the first autumn frost comes before September 18 in half of years and before September 1 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 231 year in 10 after June 5; 9 in 10 after May 11
- First autumn frost, half of years before
- September 181 year in 10 before September 1; 9 in 10 before October 1
NOAA puts the median frost-free season at 118 days, and the season without a hard freeze (28°F) at 140 days.
A hard freeze (28°F) comes after May 11 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Weston (1 mi E) in zone 4b in ZIP code 82731, the nearest ZIP area.
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00489580; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 at Weston (1 mi E)?
In a normal year in Weston (1 mi E), 36 days a year reach 90°F (4 of them 100°F or more), 188 nights fall to 32°F or colder and 59 days bring measurable precipitation.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 188a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 59a normal year
- Days with 1 inch of snow or more
- 16a normal year
The highest temperature in this station's record (since 1960) is 109°F, on July 27, 2021; the lowest is −47°F, on February 3, 1989.
The wettest calendar year on that record is 2019, with 24.83 in; the snowiest season is 2018–19, with 72.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00489580; records: ACIS (NOAA Regional Climate Centers), station USC00489580. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Weston (1 mi E)?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds at Weston (1 mi E), 4.3 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 1.8 |
| February | 70% | 2.7 |
| March | 72% | 3.9 |
| April | 71% | 5.0 |
| May | 73% | 6.0 |
| June | 82% | 7.1 |
| July | 88% | 7.2 |
| August | 87% | 6.2 |
| September | 82% | 4.8 |
| October | 75% | 3.1 |
| November | 74% | 2.1 |
| December | 68% | 1.5 |
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 many heating and cooling degree days does Weston (1 mi E) record?
A normal year at Weston (1 mi E) brings 7,541 heating degree days, 40% more than the median U.S. place (5,373), and 479 cooling degree days, 47% 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 2,198 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,287 | 0 |
| February | 1,100 | 0 |
| March | 876 | 0 |
| April | 645 | 0 |
| May | 388 | 5 |
| June | 120 | 60 |
| July | 21 | 201 |
| August | 39 | 172 |
| September | 209 | 40 |
| October | 615 | 1 |
| November | 959 | 0 |
| December | 1,283 | 0 |
| Year (annual) | 7,541 | 479 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00489580. 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.
Have recent years at Weston (1 mi E) been warmer than normal?
2025 averaged 46.9°F, 1.4°F above the 1991-2020 normal of 45.5°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.1°F | +1.6°F | 9.64 | 43.5 |
| 2022 | 45.0°F | −0.5°F | 13.93 | 49.5 |
| 2023 | 47.3°F | +1.8°F | 11.32 | 34.0 |
| 2024 | 48.4°F | +2.9°F | 9.64 | 21.0 |
| 2025 | 46.9°F | +1.4°F | 18.03 | – |
Over 38 complete years from 1961 to 2025, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.25°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00489580; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Weston (1 mi E)'s climate compare?
Weston (1 mi E) is warmer than 48 of the 71 places with their own NOAA record in Wyoming, and wetter than 42. Across the 7,247 U.S. stations with normals, its annual mean of 45.5°F is warmer than 21%.
In the Köppen classification computed from these normals, Weston (1 mi E) 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.
Questions about Weston (1 mi E)'s climate
What is the coldest month at Weston (1 mi E)?
January, with a normal high of 37°F and a normal low of 10°F. The warmest is July (87°F by day, 54°F at night).
Does it snow at Weston (1 mi E)?
Yes: 41 inches in a normal year, falling on 17 days with 0.1 inch or more, the most in December (8.2 inches).
What is the rainiest month at Weston (1 mi E)?
June, with 2.60 in of precipitation in a normal year; the driest is January with 0.36 in.
What plant hardiness zone is Weston (1 mi E) in?
The USDA's 2023 map puts Weston (1 mi E) in zone 4b in ZIP code 82731, the nearest ZIP area.
How late can frost come at Weston (1 mi E)?
In half of years the last 32°F night comes after May 23; in one year in ten it comes after June 5. Waiting until June 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Gillette, WY24 miles from this station, 45.8°F a year
- Devils Tower #2, WY29 miles from this station, 44.4°F a year
- Biddle, MT29 miles from this station, 47.4°F a year
- Echeta (2 mi NW), WY32 miles from this station, 45.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made