Powder River (School), Wyoming climate: Climate normals at a NOAA weather station
Powder River (School)'s normal year runs from 10°F December nights to 87°F July afternoons, with 13.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.5°C, December lows of −12°C, July highs of 31°C, 330 mm of precipitation a year.
- NOAA stationPowder River (School)
- Station IDUSC00487375
- Location43.04°N 106.99°W
- Elevation5,722 ft (1,744 m)
On October 22, the normal high in Powder River (School) is 55°F and the normal low 26°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Powder River (School).
- Jan 33° 11°
- Feb 36° 12°
- Mar 46° 22°
- Apr 54° 28°
- May 65° 36°
- Jun 77° 44°
- Jul 87° 51°
- Aug 85° 50°
- Sep 75° 41°
- Oct 58° 28°
- Nov 45° 20°
- Dec 34° 10°
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 Powder River (School) each month?
July is the warmest month, with normal highs of 87°F; December the coldest, with normal lows of 10°F. The most precipitation falls in May (2.28 in), the least in January (0.43 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 11°F | 22.2°F | 0.43 | – | <1 | 31 | 9 h 20 min |
| February | 36°F | 12°F | 23.9°F | 0.51 | – | <1 | 27 | 10 h 30 min |
| March | 46°F | 22°F | 34.3°F | 1.14 | – | <1 | 28 | 11 h 50 min |
| April | 54°F | 28°F | 41.2°F | 1.41 | – | <1 | 23 | 13 h 20 min |
| May | 65°F | 36°F | 50.6°F | 2.28 | – | <1 | 10 | 14 h 40 min |
| June | 77°F | 44°F | 60.4°F | 1.45 | – | 5 | 1 | 15 h 20 min |
| July | 87°F | 51°F | 69.3°F | 1.11 | – | 13 | <1 | 15 h |
| August | 85°F | 50°F | 67.5°F | 0.82 | – | 11 | <1 | 14 h |
| September | 75°F | 41°F | 57.5°F | 1.11 | – | 2 | 4 | 12 h 30 min |
| October | 58°F | 28°F | 43.4°F | 1.38 | – | <1 | 20 | 11 h 10 min |
| November | 45°F | 20°F | 32.3°F | 0.58 | – | <1 | 28 | 9 h 50 min |
| December | 34°F | 10°F | 21.9°F | 0.77 | – | <1 | 31 | 9 h |
| Year (annual) | 58°F | 29°F | 43.7°F | 12.99 | – | 31 | 200 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −12°C | −5.4°C | 11 mm |
| February | 2°C | −11°C | −4.5°C | 13 mm |
| March | 8°C | −5°C | 1.3°C | 29 mm |
| April | 12°C | −2°C | 5.1°C | 36 mm |
| May | 18°C | 2°C | 10.3°C | 58 mm |
| June | 25°C | 7°C | 15.8°C | 37 mm |
| July | 31°C | 11°C | 20.7°C | 28 mm |
| August | 30°C | 10°C | 19.7°C | 21 mm |
| September | 24°C | 5°C | 14.2°C | 28 mm |
| October | 15°C | −2°C | 6.3°C | 35 mm |
| November | 7°C | −7°C | 0.2°C | 15 mm |
| December | 1°C | −12°C | −5.6°C | 20 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00487375; 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 Powder River (School)?
Normal highs sit between 65°F and 85°F in May, June and September.
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 USC00487375.
When is the last frost at Powder River (School)?
In Powder River (School), the last spring frost (32°F) comes after May 30 in half of years and after June 13 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 8 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 301 year in 10 after June 13; 9 in 10 after May 12
- First autumn frost, half of years before
- September 221 year in 10 before September 8; 9 in 10 before October 4
NOAA puts the median frost-free season at 115 days, and the season without a hard freeze (28°F) at 141 days.
A hard freeze (28°F) comes after May 12 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Powder River (School) in zone 5a in ZIP code 82648, 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 USC00487375; 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 Powder River (School)?
In a normal year in Powder River (School), 31 days a year reach 90°F and 200 nights fall to 32°F or colder.
- Days at 90°F or more
- 31a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 200a normal year
- Days that stay below freezing
- 49high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00487375.
How sunny is it at Powder River (School)?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds at Powder River (School), 4.5 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 2.0 |
| February | 71% | 2.8 |
| March | 73% | 4.1 |
| April | 72% | 5.3 |
| May | 74% | 6.2 |
| June | 84% | 7.4 |
| July | 87% | 7.3 |
| August | 87% | 6.4 |
| September | 84% | 5.0 |
| October | 77% | 3.3 |
| November | 74% | 2.2 |
| December | 70% | 1.6 |
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 Powder River (School) record?
A normal year at Powder River (School) brings 8,059 heating degree days, 50% more than the median U.S. place (5,373), and 330 cooling degree days, 64% 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 1,924 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,327 | 0 |
| February | 1,150 | 0 |
| March | 952 | 0 |
| April | 714 | 0 |
| May | 450 | 3 |
| June | 169 | 31 |
| July | 24 | 155 |
| August | 43 | 121 |
| September | 243 | 20 |
| October | 670 | 0 |
| November | 981 | 0 |
| December | 1,336 | 0 |
| Year (annual) | 8,059 | 330 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00487375. 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 Powder River (School) been warmer than normal?
2022 averaged 42.2°F, 1.5°F below the 1991-2020 normal of 43.7°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.1°F | +0.4°F | 10.61 |
| 2022 | 42.2°F | −1.5°F | 12.20 |
Source: observed years: ACIS, station USC00487375. A year counts only with all twelve months complete.
How does Powder River (School)'s climate compare?
Powder River (School) is warmer than 29 of the 71 places with their own NOAA record in Wyoming, and wetter than 38. Across the 7,247 U.S. stations with normals, its annual mean of 43.7°F is warmer than 14%.
In the Köppen classification computed from these normals, Powder River (School) is Dfb: continental, no dry season, warm summer. 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 Powder River (School)'s climate
What is the coldest month at Powder River (School)?
December, with a normal high of 34°F and a normal low of 10°F. The warmest is July (87°F by day, 51°F at night).
What is the rainiest month at Powder River (School)?
May, with 2.28 in of precipitation in a normal year; the driest is January with 0.43 in.
What plant hardiness zone is Powder River (School) in?
The USDA's 2023 map puts Powder River (School) in zone 5a in ZIP code 82648, the nearest ZIP area.
How late can frost come at Powder River (School)?
In half of years the last 32°F night comes after May 30; in one year in ten it comes after June 13. Waiting until June 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Powder River, WY0 miles from this station, 44.6°F a year
- Casper, WY28 miles from this station, 45.6°F a year
- Pathfinder Dam, WY40 miles from this station, 46.3°F a year
- Bates Creek #2, WY43 miles from this station, 44.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made