Guernsey Dam, WY Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Guernsey Dam's primary NOAA station, GUERNSEY DAM #2.
The climate verdict for Guernsey Dam
Dryness leads the climate profile for Guernsey Dam, Wyoming, with 16.1 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
- yearly average temperature, NOAA normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 16.1"
- annual precipitation
- 145 days
- growing season, frost-free days
Guernsey Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00484126 · Guernsey Dam, WY 49°F mean · 16.1" 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 ≈ Chappell
- PRCP-DRY 16.1"
- SWING-WIDE 48°F
- COMF-LOW 52/100
- LOAD-HEAT 6,659 HDD
- STN-1 USC00484126
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Chappell, NE (+ 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.
- Guernsey Dam (this station) 49°F
- Cold Mullen, NE 49°F
- Hot Guernsey, WY 49°F
- Near Chappell, NE 49°F
- Near Lake Villa, IL 49°F
Guernsey Dam 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 Dam
Guernsey Dam: 25/100 · grade F
Guernsey Dam 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 Dam, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 48.6°F · 18.9° from 67.5°F | 34/100 · F |
| Precipitation balance | 16.1 in · 18.9 from 35 in | 32/100 · F |
| Frost-free season | 145 days/year | 22/100 · F |
| Normal heat + freeze calendar | 202 calendar days | 13/100 · F |
Guernsey Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Guernsey Dam'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
- 74.4°F
- Coldest month
- 26.4°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 Dam sits across the climate record
Three NOAA fields for Guernsey Dam'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 80%
- Guernsey Dam's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 73%
- Warmest-to-coldest month gap for Guernsey Dam is large versus 6,861 complete station-years.
How Guernsey Dam compares across U.S. station-mapped locations
Guernsey Dam'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 | 39°F (4°C) | 14°F (-10°C) | 26°F (-3°C) | 0.4" | 30.4 | 0.0 |
| February | 43°F (6°C) | 16°F (-9°C) | 29°F (-1°C) | 0.5" | 27.2 | 0.0 |
| March | 52°F (11°C) | 25°F (-4°C) | 39°F (4°C) | 0.9" | 25.5 | 0.0 |
| April | 59°F (15°C) | 32°F (0°C) | 46°F (8°C) | 2.0" | 15.8 | 0.0 |
| May | 69°F (21°C) | 43°F (6°C) | 56°F (13°C) | 3.0" | 3.7 | 2.0 |
| June | 80°F (27°C) | 53°F (12°C) | 67°F (19°C) | 2.1" | 0.0 | 11.1 |
| July | 89°F (32°C) | 59°F (15°C) | 74°F (24°C) | 1.7" | 0.0 | 19.5 |
| August | 87°F (31°C) | 57°F (14°C) | 72°F (22°C) | 1.2" | 0.0 | 21.6 |
| September | 78°F (26°C) | 47°F (9°C) | 63°F (17°C) | 1.3" | 1.2 | 10.1 |
| October | 63°F (17°C) | 33°F (1°C) | 48°F (9°C) | 1.5" | 14.0 | 0.6 |
| November | 50°F (10°C) | 24°F (-5°C) | 37°F (3°C) | 0.4" | 25.7 | 0.0 |
| December | 40°F (4°C) | 13°F (-10°C) | 27°F (-3°C) | 0.9" | 30.5 | 0.0 |
The year, day by day
Guernsey Dam works both ends of the calendar. Normal highs climb to 91°F by July 20 and hold at or above 90°F on 17 dates, then normal lows drop to freezing or below on 185 dates, bottoming at 12°F around December 23.
When the heat sits
Normal highs reach 90°F from July 15 through July 31, covering 17 dates. The broader mild season, normal highs of 70°F or more, runs May 19 to October 2.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into April 19, then returns to freezing around October 18, covering 185 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 21 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 Dam.
Where Guernsey Dam Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 185 nights a year, more than most ranked stations.
Guernsey Dam 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 Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 32% of the annual total and December through February 11%, with neither reaching the 35% that would mark a distinct wet season. Guernsey Dam has no dry season to plan around, though it does carry a wide 48°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 3.0" and January 0.4". The three wettest months together take 45% 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 3
50% probability date
Last Spring Freeze
May 11
50% probability date
Growing Season
145 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,659
Higher = more heating needed
Cooling Degree Days
712
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Guernsey Dam 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).
- Antioch, IL 49°F · 0.0°F off
- Baker, NV 49°F · 0.0°F off
- Blissfield, MI 49°F · 0.0°F off
- Bloomingdale, MI 49°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (16.1" here), excluding temperature-peer places.
- Alpine, TX 16.1" · 0.0" off
- Alpine, CA 16.1" · 0.0" off
- Wibaux, MT 16.1" · 0.0" off
- Tremonton, UT 16.1" · 0.0" off
Data-derived climate profile
How Guernsey Dam's climate pattern fits together
heating led · dry · mid swing
Guernsey Dam's energy balance leans toward cold weather: 6,659 annual heating degree days against 712 for cooling. Its 48.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 145 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 January mark the typical warm and cold ends of the calendar in Guernsey Dam's middle-range seasonal profile. The measured spread is 48.0°F. The annual average is 49°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Guernsey Dam's cold-season load does not imply a wet climate. Annual precipitation is 16.1 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 Dam'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 Dam, not an official NOAA class or a year-ahead forecast.
Questions about Guernsey Dam's climate
How much rain does Guernsey Dam get? ▼
How many days above 90°F does Guernsey Dam get? ▼
How much energy does heating and cooling require in Guernsey Dam? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Guernsey Dam's primary station: GUERNSEY DAM #2 (USC00484126). 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 Guernsey Dam; 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 Guernsey Dam 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.