Powder Rvr, WY Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Powder Rvr's primary NOAA station, POWDER RVR (SCHOOL).
The climate verdict for Powder Rvr
Dryness leads the climate profile for Powder Rvr, Wyoming, with 13.0 inches of precipitation a year. NOAA records an annual average of 44°F. At 40/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 6% of scores.
- 44°F
- annual average temperature (NOAA normal)
- 40/100
- comfort score, above 6% of station-mapped location scores
- 13.0"
- yearly precipitation total
- 115 days
- frost-free days per growing season
Powder Rvr: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00487375 · Powder Rvr, WY 44°F mean · 13.0" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 44°F
- RANK-COOL #961
- PHOTO-FINISH ≈ Rock Springs
- PRCP-DRY 13.0"
- SWING-WIDE 47°F
- COMF-LOW 40/100
- LOAD-HEAT 8,059 HDD
- STN-1 USC00487375
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Rock Springs, WY (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every WY station list.
- Powder Rvr (this station) 44°F
- Cold Clearmont, WY 44°F
- Hot Peshtigo, WI 44°F
- Near Rock Springs, WY 44°F
- Near Lowville, NY 44°F
Powder Rvr sits in Wyoming, the #5 coldest U.S. state at 43.3°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Powder Rvr
Powder Rvr: 13/100 · grade F
Powder Rvr publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Powder Rvr, not an official NOAA rating. Rankings still use Comfort Score 40/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 13.0 in · 22.0 from 35 in | 21/100 · F |
| Annual temperature balance | 43.7°F · 23.8° from 67.5°F | 15/100 · F |
| Normal heat + freeze calendar | 213 calendar days | 8/100 · F |
| Frost-free season | 115 days/year | 5/100 · F |
Powder Rvr · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Powder Rvr is a continental Köppen climate: Dfb
Coldest-month mean 21.9°F and warmest-month mean 69.3°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 69.3°F
- Coldest month
- 21.9°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Powder Rvr sits across the climate record
Three NOAA fields for Powder Rvr's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 86%
- Among 6,861 stations, Powder Rvr sits in the cooler third of annual means.
- Annual precipitation
- Drier than 87%
- Powder Rvr's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 70%
- Warmest-to-coldest month gap for Powder Rvr is large versus 6,861 complete station-years.
How Powder Rvr compares across U.S. station-mapped locations
Powder Rvr's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
40 6th percentile score exceeds 6% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 33°F (1°C) | 11°F (-12°C) | 22°F (-5°C) | 0.4" | 30.9 | 0.0 |
| February | 36°F (2°C) | 12°F (-11°C) | 24°F (-5°C) | 0.5" | 27.0 | 0.0 |
| March | 46°F (8°C) | 22°F (-5°C) | 34°F (1°C) | 1.1" | 27.7 | 0.0 |
| April | 54°F (12°C) | 28°F (-2°C) | 41°F (5°C) | 1.4" | 22.5 | 0.0 |
| May | 65°F (18°C) | 36°F (2°C) | 51°F (10°C) | 2.3" | 9.5 | 0.0 |
| June | 77°F (25°C) | 44°F (7°C) | 60°F (16°C) | 1.4" | 0.7 | 4.5 |
| July | 87°F (31°C) | 51°F (11°C) | 69°F (21°C) | 1.1" | 0.0 | 13.1 |
| August | 85°F (30°C) | 50°F (10°C) | 68°F (20°C) | 0.8" | 0.1 | 10.6 |
| September | 75°F (24°C) | 41°F (5°C) | 58°F (14°C) | 1.1" | 3.5 | 2.3 |
| October | 58°F (15°C) | 28°F (-2°C) | 43°F (6°C) | 1.4" | 19.8 | 0.0 |
| November | 45°F (7°C) | 20°F (-7°C) | 32°F (0°C) | 0.6" | 27.7 | 0.0 |
| December | 34°F (1°C) | 10°F (-12°C) | 22°F (-6°C) | 0.8" | 30.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 89°F around July 24, short of 90°F on every date, while 213 dates carry a normal low at or below freezing, the coldest 8°F near December 21.
The freezing stretch
The normal low stays at or below 32°F into May 5, then returns to freezing around October 6, covering 213 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
The widest day
July 6 carries the biggest normal gap between afternoon and dawn, 36°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Powder Rvr.
Where Powder Rvr Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 213 nights a year, placing this among the most frost-prone tenth of ranked stations.
A drier-than-most normal water year — around 13 inches, below what four out of five ranked stations collect.
Powder Rvr earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Powder Rvr spreads its precipitation across the year
Neither half of the year dominates here: June through August take 26% of the annual total and December through February 13%, with neither reaching the 35% that would mark a distinct wet season. Powder Rvr has no dry season to plan around, though it does carry a wide 47.4°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 2.3" and January 0.4". The three wettest months together take 40% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
Frost Dates & Growing Season
First Fall Freeze
September 22
50% probability date
Last Spring Freeze
May 30
50% probability date
Growing Season
115 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,059
Higher = more heating needed
Cooling Degree Days
330
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WY closest to Powder Rvr on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (44°F here).
- Beach, ND 44°F · 0.0°F off
- Benson, MN 44°F · 0.0°F off
- Cheboygan, MI 44°F · 0.0°F off
- Conrad, MT 44°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (13.0" here), excluding temperature-peer places.
- Cedar City, UT 13.0" · 0.0" off
- Cheraw, CO 13.0" · 0.0" off
- Sierra Vista, AZ 13.0" · 0.0" off
- Susanville, CA 13.0" · 0.0" off
Scarce-water calendar
Where Powder Rvr's limited precipitation lands
heating led · dry · mid swing
Powder Rvr's energy balance leans toward cold weather: 8,059 annual heating degree days against 330 for cooling. Its 47.4°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 115 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and December mark the typical warm and cold ends of the calendar in Powder Rvr's middle-range seasonal profile. The measured spread is 47.4°F. The annual average is 44°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Powder Rvr's cold-season load does not imply a wet climate. Annual precipitation is 13.0 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Powder Rvr wettest normal
May
May concentrates the scarce annual total (13.0 inches).
Powder Rvr driest normal
January
January is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Powder Rvr's climate
How dry is Powder Rvr? ▼
How many days above 90°F does Powder Rvr get? ▼
How much energy does heating and cooling require in Powder Rvr? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Powder Rvr's primary station: POWDER RVR (SCHOOL) (USC00487375). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Powder Rvr; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Powder Rvr comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.