Guernsey, 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 Guernsey's primary NOAA station, GUERNSEY 2NW.
The climate verdict for Guernsey
Dryness leads the climate profile for Guernsey, Wyoming, with 15.1 inches of precipitation a year. NOAA records an annual average of 49°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 49°F
- average temperature, NOAA 1991-2020 normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 15.1"
- yearly precipitation total
- 152 days
- frost-free growing season
Guernsey: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00484131 · Guernsey, WY 49°F mean · 15.1" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 49°F
- RANK-COOL #2,333
- PHOTO-FINISH ≈ Lake Villa
- PRCP-DRY 15.1"
- SWING-WIDE 47°F
- COMF-LOW 52/100
- LOAD-HEAT 6,645 HDD
- STN-1 USC00484131
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Lake Villa, IL ( -0.1 °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.
- Guernsey (this station) 49°F
- Cold Logan Utah St U…, UT 49°F
- Near Lake Villa, IL 49°F
- Near Guernsey Dam, WY 49°F
- Near Chappell, NE 49°F
Guernsey 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 · Guernsey
Guernsey: 30/100 · grade F
Guernsey publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Guernsey, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 48.7°F · 18.8° from 67.5°F | 35/100 · F |
| Precipitation balance | 15.1 in · 19.9 from 35 in | 29/100 · F |
| Frost-free season | 152 days/year | 27/100 · F |
| Normal heat + freeze calendar | 178 calendar days | 26/100 · F |
Guernsey · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Guernsey's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 74.2°F
- Coldest month
- 27.1°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 Guernsey sits across the climate record
Three NOAA fields for Guernsey's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 34th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 82%
- Guernsey's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 69th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Guernsey compares across U.S. station-mapped locations
Guernsey's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% 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%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 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 | 40°F (5°C) | 14°F (-10°C) | 27°F (-3°C) | 0.7" | 30.6 | 0.0 |
| February | 41°F (5°C) | 16°F (-9°C) | 28°F (-2°C) | 0.5" | 26.4 | 0.0 |
| March | 52°F (11°C) | 25°F (-4°C) | 38°F (3°C) | 0.9" | 21.8 | 0.0 |
| April | 59°F (15°C) | 32°F (0°C) | 46°F (8°C) | 1.8" | 12.3 | 0.0 |
| May | 69°F (20°C) | 43°F (6°C) | 56°F (13°C) | 2.9" | 2.5 | 0.5 |
| June | 81°F (27°C) | 53°F (12°C) | 67°F (19°C) | 2.1" | 0.0 | 8.3 |
| July | 89°F (32°C) | 60°F (15°C) | 74°F (23°C) | 1.7" | 0.0 | 17.0 |
| August | 88°F (31°C) | 58°F (14°C) | 73°F (23°C) | 1.2" | 0.0 | 14.3 |
| September | 78°F (26°C) | 48°F (9°C) | 63°F (17°C) | 1.2" | 0.6 | 6.2 |
| October | 63°F (17°C) | 34°F (1°C) | 49°F (9°C) | 1.3" | 11.5 | 0.0 |
| November | 50°F (10°C) | 23°F (-5°C) | 36°F (2°C) | 0.5" | 25.1 | 0.0 |
| December | 40°F (5°C) | 15°F (-9°C) | 28°F (-2°C) | 0.3" | 29.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 90°F around July 25, short of 90°F on every date, while 178 dates carry a normal low at or below freezing, the coldest 14°F near December 29.
The freezing stretch
The normal low stays at or below 32°F into April 15, then returns to freezing around October 21, covering 178 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
September 4 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Guernsey.
Where Guernsey Stands Nationally
A drier-than-most normal water year — around 15 inches, below what four out of five ranked stations collect.
Guernsey earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Guernsey spreads its precipitation across the year
Neither half of the year dominates here: June through August take 33% of the annual total and December through February 10%, with neither reaching the 35% that would mark a distinct wet season. Guernsey has no dry season to plan around, though it does carry a wide 47.1°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 2.9" and December 0.3". The three wettest months together take 44% 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
October 6
50% probability date
Last Spring Freeze
May 7
50% probability date
Growing Season
152 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,645
Higher = more heating needed
Cooling Degree Days
725
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Guernsey 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 (49°F here).
- Clarkson, NE 49°F · 0.0°F off
- Cuba, NM 49°F · 0.0°F off
- Dove Creek, CO 49°F · 0.0°F off
- Loveland, CO 49°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (15.1" here), excluding temperature-peer places.
- Bly, OR 15.1" · 0.0" off
- Lee Vining, CA 15.1" · 0.0" off
- Monticello, UT 15.1" · 0.0" off
- Potomac, MT 15.1" · 0.0" off
Data-derived climate profile
How Guernsey's climate pattern fits together
heating led · dry · mid swing
Guernsey's energy balance leans toward cold weather: 6,645 annual heating degree days against 725 for cooling. Its 47.1°F seasonal range still makes the monthly rows more useful than the annual average alone.
Guernsey's frost-free season lasts about 152 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in Guernsey's middle-range seasonal profile. The measured spread is 47.1°F. The annual average is 49°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Guernsey's cold-season load does not imply a wet climate. Annual precipitation is 15.1 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.
These labels group NOAA 1991-2020 normals from Guernsey's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Guernsey, not an official NOAA class or a year-ahead forecast.
Questions about Guernsey's climate
How much rain does Guernsey get? ▼
How many days above 90°F does Guernsey get? ▼
How much energy does heating and cooling require in Guernsey? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Guernsey's primary station: GUERNSEY 2NW (USC00484131). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 5634320). Match rule for Guernsey: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Guernsey 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.