Evanston, WY Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Evanston's primary NOAA station, EVANSTON 1 E.
The climate verdict for Evanston
Dryness leads the climate profile for Evanston, Wyoming, with 12.1 inches of precipitation a year. NOAA records an annual average of 42°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.
- 42°F
- annual average temperature (NOAA normal)
- 40/100
- comfort score, above 6% of station-mapped location scores
- 12.1"
- yearly precipitation total
- 92 days
- growing season, frost-free days
Evanston: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00483100 · Evanston, WY 42°F mean · 12.1" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 42°F
- RANK-COOL #617
- PHOTO-FINISH ≈ Phillipsburg Ra…
- PRCP-DRY 12.1"
- SWING-MID 43°F
- COMF-LOW 40/100
- LOAD-HEAT 8,457 HDD
- STN-1 USC00483100
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Phillipsburg Ranger Station, MT (+ 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.
- Evanston (this station) 42°F
- Cold Lamoille, NV 42°F
- Hot Gibbonsville, ID 42°F
- Near Phillipsburg Ra…, MT 42°F
- Near White Sulphur S…, MT 42°F
Evanston 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 · Evanston
Evanston: 10/100 · grade F
Evanston publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Evanston, not an official NOAA rating. Rankings still use Comfort Score 40/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 12.1 in · 22.9 from 35 in | 19/100 · F |
| Annual temperature balance | 42.0°F · 25.5° from 67.5°F | 9/100 · F |
| Normal heat + freeze calendar | 211 calendar days | 9/100 · F |
| Frost-free season | 92 days/year | 0/100 · F |
Evanston · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Evanston is a continental Köppen climate: Dfb
Coldest-month mean 21.8°F and warmest-month mean 64.4°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
- 64.4°F
- Coldest month
- 21.8°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 Evanston sits across the climate record
Three NOAA fields for Evanston's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 91%
- Among 6,861 stations, Evanston sits in the cooler third of annual means.
- Annual precipitation
- Drier than 90%
- Evanston's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 47th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Evanston compares across U.S. station-mapped locations
Evanston'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
Evanston's measured station temperature trend
MethodologyAcross 33 complete annual observations from 1951 to 2025, EVANSTON 1 E warmed at a fitted rate of 0.31°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Evanston primary station fitted change +0.31 °C/decade
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 (0°C) | 11°F (-12°C) | 22°F (-6°C) | 0.8" | 30.8 | 0.0 |
| February | 35°F (1°C) | 13°F (-10°C) | 24°F (-4°C) | 0.6" | 27.4 | 0.0 |
| March | 44°F (7°C) | 21°F (-6°C) | 33°F (0°C) | 0.7" | 29.3 | 0.0 |
| April | 53°F (12°C) | 27°F (-3°C) | 40°F (5°C) | 1.0" | 23.9 | 0.0 |
| May | 63°F (17°C) | 35°F (1°C) | 49°F (9°C) | 1.9" | 11.4 | 0.0 |
| June | 73°F (23°C) | 41°F (5°C) | 57°F (14°C) | 1.1" | 2.6 | 0.1 |
| July | 81°F (27°C) | 48°F (9°C) | 64°F (18°C) | 0.8" | 0.2 | 1.6 |
| August | 80°F (26°C) | 47°F (8°C) | 63°F (17°C) | 1.1" | 0.4 | 0.3 |
| September | 71°F (22°C) | 39°F (4°C) | 55°F (13°C) | 1.2" | 5.7 | 0.0 |
| October | 58°F (14°C) | 30°F (-1°C) | 44°F (7°C) | 1.1" | 20.0 | 0.0 |
| November | 43°F (6°C) | 19°F (-7°C) | 31°F (0°C) | 1.0" | 28.0 | 0.0 |
| December | 33°F (0°C) | 11°F (-12°C) | 22°F (-6°C) | 0.7" | 30.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 83°F around July 25, short of 90°F on every date, while 211 dates carry a normal low at or below freezing, the coldest 10°F near December 20.
The freezing stretch
The normal low stays at or below 32°F into May 5, then returns to freezing around October 8, covering 211 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.
Where the wet dates fall
The likeliest wet date is May 7, when 24% of years recorded at least a hundredth of an inch. The driest is July 5 at 14%. Summed across the calendar, that is about 70 wet dates a year.
The widest day
July 8 carries the biggest normal gap between afternoon and dawn, 34°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Evanston.
Where Evanston Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 211 nights a year, placing this among the most frost-prone tenth of ranked stations.
A drier-than-most normal water year — around 12 inches, below what four out of five ranked stations collect.
Evanston earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
5.1 days with precipitation
6.1 days with precipitation
5.1 days with precipitation
7.1 days with precipitation
7.1 days with precipitation
5.7 days with precipitation
4.3 days with precipitation
5.9 days with precipitation
5.4 days with precipitation
5.7 days with precipitation
5.9 days with precipitation
6.1 days with precipitation
Evanston spreads its precipitation across the year
Neither half of the year dominates here: June through August take 25% of the annual total and December through February 18%, with neither reaching the 35% that would mark a distinct wet season. Evanston has no dry season to plan around, though it does carry a 42.6°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 1.9" and February 0.6". The three wettest months together take 35% 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.
Evanston is dry, and what does fall arrives gently
Only about 70 days a year record measurable precipitation here, 19% of the calendar, and they carry 12.1" between them. At roughly 0.17 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is April at about 7 wet days; the driest is July at about 4.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Frost Dates & Growing Season
First Fall Freeze
September 12
50% probability date
Last Spring Freeze
June 12
50% probability date
Growing Season
92 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,457
Higher = more heating needed
Cooling Degree Days
84
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Evanston 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 (42°F here).
- Boonville, NY 42°F · 0.0°F off
- Dickinson, ND 42°F · 0.0°F off
- Grafton, ND 42°F · 0.0°F off
- Melrose, MN 42°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (12.1" here), excluding temperature-peer places.
- Hachita, NM 12.1" · 0.0" off
- Lindsay, CA 12.1" · 0.0" off
- Valentine, TX 12.1" · 0.0" off
- Walden, CO 12.1" · 0.0" off
Scarce-water calendar
Where Evanston's limited precipitation lands
heating led · dry · mid swing
Evanston's energy balance leans toward cold weather: 8,457 annual heating degree days against 84 for cooling. Its 42.6°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 92 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 Evanston's middle-range seasonal profile. The measured spread is 42.6°F. The annual average is 42°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Evanston's cold-season load does not imply a wet climate. Annual precipitation is 12.1 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.
Evanston wettest normal
May
May concentrates the scarce annual total (12.1 inches).
Evanston driest normal
February
February is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Evanston's climate
How dry is Evanston? ▼
How cold does Evanston get in winter? ▼
How much energy does heating and cooling require in Evanston? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Evanston's primary station: EVANSTON 1 E (USC00483100). 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 5625620). Match rule for Evanston: 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 Evanston 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.