Douglas, Wyoming climate: Normal weather by month, frost dates and records
Douglas's normal year runs from 12°F December nights to 89°F July afternoons, with 11.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, December lows of −11°C, July highs of 32°C, 285 mm of precipitation a year.
- NOAA stationDouglas Converse County Airport
- Station IDUSW00094057
- Location42.80°N 105.39°W
- Elevation4,929 ft (1,502 m)
- Population6,442
On October 23, the normal high in Douglas is 58°F and the normal low 28°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Douglas.
- Jan 39° 13°
- Feb 40° 14°
- Mar 50° 23°
- Apr 58° 30°
- May 67° 39°
- Jun 80° 48°
- Jul 89° 55°
- Aug 87° 53°
- Sep 77° 43°
- Oct 61° 30°
- Nov 48° 20°
- Dec 38° 12°
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 Douglas each month?
July is the warmest month, with normal highs of 89°F; December the coldest, with normal lows of 12°F. The most precipitation falls in May (2.32 in), the least in December (0.27 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 13°F | 25.8°F | 0.30 | 4 | <1 | 30 | 9 h 20 min |
| February | 40°F | 14°F | 27.1°F | 0.31 | 6 | <1 | 27 | 10 h 30 min |
| March | 50°F | 23°F | 36.5°F | 0.68 | 7 | <1 | 27 | 11 h 50 min |
| April | 58°F | 30°F | 43.6°F | 1.58 | 10 | <1 | 19 | 13 h 20 min |
| May | 67°F | 39°F | 52.9°F | 2.32 | 12 | <1 | 7 | 14 h 40 min |
| June | 80°F | 48°F | 63.7°F | 1.63 | 9 | 6 | <1 | 15 h 20 min |
| July | 89°F | 55°F | 71.9°F | 0.85 | 7 | 19 | <1 | 15 h |
| August | 87°F | 53°F | 69.9°F | 1.04 | 7 | 14 | <1 | 14 h |
| September | 77°F | 43°F | 59.6°F | 0.97 | 7 | 4 | 3 | 12 h 30 min |
| October | 61°F | 30°F | 45.6°F | 0.92 | 7 | <1 | 18 | 11 h 10 min |
| November | 48°F | 20°F | 34.0°F | 0.35 | 4 | <1 | 27 | 9 h 50 min |
| December | 38°F | 12°F | 24.9°F | 0.27 | 5 | <1 | 30 | 9 h |
| Year (annual) | 61°F | 32°F | 46.3°F | 11.22 | 84 | 43 | 189 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −11°C | −3.4°C | 8 mm |
| February | 5°C | −10°C | −2.7°C | 8 mm |
| March | 10°C | −5°C | 2.5°C | 17 mm |
| April | 14°C | −1°C | 6.4°C | 40 mm |
| May | 19°C | 4°C | 11.6°C | 59 mm |
| June | 27°C | 9°C | 17.6°C | 41 mm |
| July | 32°C | 13°C | 22.2°C | 22 mm |
| August | 31°C | 12°C | 21.1°C | 26 mm |
| September | 25°C | 6°C | 15.3°C | 25 mm |
| October | 16°C | −1°C | 7.6°C | 23 mm |
| November | 9°C | −7°C | 1.1°C | 9 mm |
| December | 3°C | −11°C | −3.9°C | 7 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. Douglas's own co-op station Douglas (1 mi SE) does: 59 inches of snow in a normal year (see the other stations below).
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094057; 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 Douglas?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (7).
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 USW00094057.
When is the last frost in Douglas?
In Douglas, the last spring frost (32°F) comes after May 23 in half of years and after June 7 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 9 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
- May 231 year in 10 after June 7; 9 in 10 after May 10
- First autumn frost, half of years before
- September 221 year in 10 before September 9; 9 in 10 before October 4
NOAA puts the median frost-free season at 122 days, and the season without a hard freeze (28°F) at 144 days.
A hard freeze (28°F) comes after May 8 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Douglas in zone 5a in ZIP code 82633, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Douglas's NOAA station is in zone 4b: the coldest night of a typical year reaches −22°F (17 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 USW00094057; 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 Douglas?
In a normal year in Douglas, 43 days a year reach 90°F (3 of them 100°F or more), 189 nights fall to 32°F or colder and 84 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 3a normal year
- Nights at 32°F or colder
- 189a normal year
- Days that stay below freezing
- 37high of 32°F or less
- Days with 0.01 inch of precipitation
- 84a normal year
The highest temperature in this station's record (since 1999) is 105°F, on July 16, 2005; the lowest is −33°F, on January 27, 2009.
The wettest calendar year on that record is 2003, with 15.42 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094057; records: ACIS (NOAA Regional Climate Centers), station USW00094057. Records use complete months only; a month missing more than three days is left out.
How sunny is Douglas?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Douglas, 4.5 kWh per square metre a day. July is the sunniest month (85%) and April the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.2 |
| February | 73% | 3.1 |
| March | 73% | 4.3 |
| April | 71% | 5.3 |
| May | 73% | 6.2 |
| June | 82% | 7.3 |
| July | 85% | 7.1 |
| August | 84% | 6.2 |
| September | 83% | 5.0 |
| October | 77% | 3.4 |
| November | 75% | 2.4 |
| December | 71% | 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 Douglas need?
A normal year in Douglas brings 7,303 heating degree days, 36% more than the median U.S. place (5,373), and 512 cooling degree days, 44% 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 2,282 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,215 | 0 |
| February | 1,061 | 0 |
| March | 884 | 0 |
| April | 644 | 0 |
| May | 383 | 7 |
| June | 107 | 67 |
| July | 11 | 225 |
| August | 27 | 178 |
| September | 197 | 35 |
| October | 602 | 0 |
| November | 930 | 0 |
| December | 1,243 | 0 |
| Year (annual) | 7,303 | 512 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094057. 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 Douglas been warmer than normal lately?
2025 averaged 47.7°F, 1.4°F above the 1991-2020 normal of 46.3°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.1°F | +0.8°F | 5.27 |
| 2022 | 45.9°F | −0.4°F | 2.88 |
| 2023 | 45.6°F | −0.7°F | – |
| 2024 | 48.1°F | +1.8°F | 8.77 |
| 2025 | 47.7°F | +1.4°F | 15.09 |
Source: observed years: ACIS, station USW00094057. A year counts only with all twelve months complete.
How does Douglas's climate compare?
Douglas is warmer than 54 of the other 70 places with their own NOAA record in Wyoming, and wetter than 27. Across the 7,247 U.S. stations with normals, its annual mean of 46.3°F is warmer than 25%.
In the Köppen classification computed from these normals, Douglas 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.
Which places near Douglas share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Glenrock, WY2,412 people · 24 mi W
- Rolling Hills, WY426 people · 24 mi W
- Orin, WY24 people · 15 mi SE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Douglas's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Douglas. This page uses Douglas Converse County Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Douglas (1 mi SE) USC00482685 | 4 mi S | 4,870 ft | 46.3°F | 12°F | 88°F | 14.5 | 59 | May 19 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Douglas's climate
What is the coldest month in Douglas?
December, with a normal high of 38°F and a normal low of 12°F. The warmest is July (89°F by day, 55°F at night).
Does it snow in Douglas?
Yes. NOAA publishes no 1991-2020 snowfall normal for Douglas's NOAA station; Douglas's own co-op station Douglas (1 mi SE) records 59 inches of snow in a normal year.
What is the rainiest month in Douglas?
May, with 2.32 in of precipitation in a normal year; the driest is December with 0.27 in.
What plant hardiness zone is Douglas in?
The USDA's 2023 map puts Douglas in zone 5a in ZIP code 82633, the nearest ZIP area. By the same method at Douglas's NOAA station, the coldest night of a typical year reaches −22°F (17 years, 1991-2020): zone 4b.
How late can frost come in Douglas?
In half of years the last 32°F night comes after May 23; in one year in ten it comes after June 7. Waiting until June 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Wyoming climateThe statewide normals and every place in the state
- Glendo, WY31 miles from this station, 47.8°F a year
- Double Four Ranch, WY43 miles from this station, 44.4°F a year
- Lusk, WY46 miles from this station, 44.4°F a year
- Shirley Basin, WY47 miles from this station, 38.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made