Evanston, Wyoming climate: Normal weather by month, frost dates and records
Evanston's normal year runs from 14°F January nights to 82°F July afternoons, with 9.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.8°C, January lows of −10°C, July highs of 28°C, 242 mm of precipitation a year.
- NOAA stationEvanston Burns Field
- Station IDUSW00004111
- Location41.27°N 111.03°W
- Elevation7,163 ft (2,183 m)
- Population11,691
On October 23, the normal high in Evanston is 52°F and the normal low 30°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Evanston.
- Jan 30° 14°
- Feb 32° 15°
- Mar 41° 22°
- Apr 50° 28°
- May 61° 37°
- Jun 72° 44°
- Jul 82° 53°
- Aug 80° 51°
- Sep 70° 43°
- Oct 56° 32°
- Nov 41° 22°
- Dec 30° 14°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Evanston each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 14°F. The most precipitation falls in May (1.75 in), the least in December (0.38 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 30°F | 14°F | 21.7°F | 0.41 | 6 | <1 | 31 | 9 h 30 min |
| February | 32°F | 15°F | 23.1°F | 0.53 | 7 | <1 | 27 | 10 h 40 min |
| March | 41°F | 22°F | 31.4°F | 0.45 | 7 | <1 | 28 | 11 h 50 min |
| April | 50°F | 28°F | 39.1°F | 0.99 | 9 | <1 | 22 | 13 h 20 min |
| May | 61°F | 37°F | 48.7°F | 1.75 | 9 | <1 | 10 | 14 h 30 min |
| June | 72°F | 44°F | 58.1°F | 1.06 | 6 | 1 | 2 | 15 h 10 min |
| July | 82°F | 53°F | 67.5°F | 0.55 | 5 | 4 | <1 | 14 h 50 min |
| August | 80°F | 51°F | 65.6°F | 0.83 | 7 | 1 | <1 | 13 h 50 min |
| September | 70°F | 43°F | 56.3°F | 1.01 | 6 | <1 | 3 | 12 h 30 min |
| October | 56°F | 32°F | 43.9°F | 0.99 | 7 | <1 | 15 | 11 h 10 min |
| November | 41°F | 22°F | 31.1°F | 0.56 | 6 | <1 | 26 | 9 h 50 min |
| December | 30°F | 14°F | 21.8°F | 0.38 | 6 | <1 | 31 | 9 h 10 min |
| Year (annual) | 54°F | 31°F | 42.4°F | 9.51 | 80 | 6 | 193 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −10°C | −5.7°C | 10 mm |
| February | 0°C | −10°C | −4.9°C | 13 mm |
| March | 5°C | −6°C | −0.3°C | 11 mm |
| April | 10°C | −2°C | 3.9°C | 25 mm |
| May | 16°C | 3°C | 9.3°C | 44 mm |
| June | 22°C | 7°C | 14.5°C | 27 mm |
| July | 28°C | 12°C | 19.7°C | 14 mm |
| August | 27°C | 11°C | 18.7°C | 21 mm |
| September | 21°C | 6°C | 13.5°C | 26 mm |
| October | 13°C | 0°C | 6.6°C | 25 mm |
| November | 5°C | −6°C | −0.5°C | 14 mm |
| December | −1°C | −10°C | −5.7°C | 10 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Woodruff (18 miles away), gets 50 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004111; 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.
When is the best weather to visit Evanston?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, July has the fewest days with rain (5).
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 USW00004111.
When is the last frost in Evanston?
In Evanston, the last spring frost (32°F) comes after June 3 in half of years and after June 17 in one year in ten; the first autumn frost comes before September 25 in half of years and before September 11 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
- June 31 year in 10 after June 17; 9 in 10 after May 16
- First autumn frost, half of years before
- September 251 year in 10 before September 11; 9 in 10 before October 8
NOAA puts the median frost-free season at 113 days, and the season without a hard freeze (28°F) at 138 days.
A hard freeze (28°F) comes after May 17 in half of springs and before October 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Evanston in zone 5a in ZIP code 84086, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Evanston's NOAA station is in zone 6a: the coldest night of a typical year reaches −10°F (21 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Wyoming · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00004111; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 in Evanston?
In a normal year in Evanston, 6 days a year reach 90°F, 193 nights fall to 32°F or colder and 80 days bring measurable precipitation.
- Days at 90°F or more
- 6a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 193a normal year
- Days that stay below freezing
- 69high of 32°F or less
- Days with 0.01 inch of precipitation
- 80a normal year
The highest temperature in this station's record (since 1999) is 95°F, on July 11, 2024; the lowest is −19°F, on February 2, 2011.
The wettest calendar year on that record is 2023, with 12.65 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00004111; records: ACIS (NOAA Regional Climate Centers), station USW00004111. Records use complete months only; a month missing more than three days is left out.
How sunny is Evanston?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Evanston, 4.8 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 2.2 |
| February | 72% | 3.1 |
| March | 75% | 4.4 |
| April | 74% | 5.5 |
| May | 77% | 6.5 |
| June | 87% | 7.8 |
| July | 90% | 7.7 |
| August | 89% | 6.7 |
| September | 86% | 5.3 |
| October | 80% | 3.7 |
| November | 72% | 2.4 |
| December | 67% | 1.8 |
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 much heating and cooling does Evanston need?
A normal year in Evanston brings 8,428 heating degree days, 57% more than the median U.S. place (5,373), and 204 cooling degree days, 77% 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 1,663 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,342 | 0 |
| February | 1,172 | 0 |
| March | 1,043 | 0 |
| April | 777 | 0 |
| May | 506 | 1 |
| June | 224 | 17 |
| July | 30 | 106 |
| August | 54 | 73 |
| September | 268 | 8 |
| October | 654 | 0 |
| November | 1,017 | 0 |
| December | 1,341 | 0 |
| Year (annual) | 8,428 | 204 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004111. 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.
Has Evanston been warmer than normal lately?
2025 averaged 45.7°F, 3.3°F above the 1991-2020 normal of 42.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 44.9°F | +2.5°F | 7.04 |
| 2022 | 42.7°F | +0.3°F | 7.34 |
| 2023 | 41.9°F | −0.5°F | 12.65 |
| 2024 | 45.5°F | +3.1°F | 8.15 |
| 2025 | 45.7°F | +3.3°F | 6.38 |
Source: observed years: ACIS, station USW00004111. A year counts only with all twelve months complete.
How does Evanston's climate compare?
Evanston is warmer than 23 of the other 70 places with their own NOAA record in Wyoming, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 42.4°F is warmer than 10%.
In the Köppen classification computed from these normals, Evanston is BSk: cold semi-arid steppe. 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.
What do Evanston's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Evanston. This page uses Evanston Burns Field; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Evanston (1 mi E) USC00483100 | 4 mi E | 6,825 ft | 42.0°F | 11°F | 81°F | 12.1 | – | June 12 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Evanston's climate
What is the coldest month in Evanston?
January, with a normal high of 30°F and a normal low of 14°F. The warmest is July (82°F by day, 53°F at night).
Does it snow in Evanston?
Yes. NOAA publishes no 1991-2020 snowfall normal for Evanston's NOAA station; the nearest record that keeps one, Woodruff (18 miles away), records 50 inches of snow in a normal year.
What is the rainiest month in Evanston?
May, with 1.75 in of precipitation in a normal year; the driest is December with 0.38 in.
What plant hardiness zone is Evanston in?
The USDA's 2023 map puts Evanston in zone 5a in ZIP code 84086, the nearest ZIP area. By the same method at Evanston's NOAA station, the coldest night of a typical year reaches −10°F (21 years, 1991-2020): zone 6a.
How late can frost come in Evanston?
In half of years the last 32°F night comes after June 3; in one year in ten it comes after June 17. Waiting until June 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Woodruff, UT19 miles from this station, 39.2°F a year
- Randolph, UT28 miles from this station, 39.4°F a year
- Echo, UT30 miles from this station, 46.4°F a year
- Coalville, UT31 miles from this station, 46.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made