Wilbur, Washington climate: Normal weather by month, frost dates and records
Wilbur's normal year runs from 20°F January nights to 85°F July afternoons, with 12.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.6°C, January lows of −7°C, July highs of 29°C, 318 mm of precipitation a year.
- NOAA stationWilbur
- Station IDUSC00459238
- Location47.77°N 118.72°W
- Elevation2,262 ft (690 m)
- Population926
On October 23, the normal high in Wilbur is 54°F and the normal low 30°F, and the chance of measurable rain or snow is 24%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Wilbur.
- Jan 32° 20°
- Feb 38° 21°
- Mar 48° 27°
- Apr 58° 31°
- May 68° 39°
- Jun 75° 44°
- Jul 85° 50°
- Aug 84° 49°
- Sep 75° 42°
- Oct 59° 32°
- Nov 42° 26°
- Dec 32° 20°
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 Wilbur each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 20°F. The most precipitation falls in December (1.69 in), the least in August (0.27 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 20°F | 25.7°F | 1.63 | 9 | <1 | 30 | 8 h 50 min |
| February | 38°F | 21°F | 29.8°F | 0.88 | 6 | <1 | 25 | 10 h 10 min |
| March | 48°F | 27°F | 37.5°F | 1.27 | 8 | <1 | 25 | 11 h 50 min |
| April | 58°F | 31°F | 44.2°F | 0.93 | 7 | <1 | 18 | 13 h 40 min |
| May | 68°F | 39°F | 53.4°F | 1.17 | 7 | <1 | 5 | 15 h 10 min |
| June | 75°F | 44°F | 59.2°F | 0.93 | 6 | 2 | 1 | 16 h |
| July | 85°F | 50°F | 67.5°F | 0.65 | 3 | 11 | <1 | 15 h 40 min |
| August | 84°F | 49°F | 66.7°F | 0.27 | 3 | 10 | <1 | 14 h 20 min |
| September | 75°F | 42°F | 58.1°F | 0.45 | 3 | 2 | 2 | 12 h 40 min |
| October | 59°F | 32°F | 45.3°F | 1.03 | 7 | <1 | 15 | 11 h |
| November | 42°F | 26°F | 33.9°F | 1.62 | 8 | <1 | 24 | 9 h 20 min |
| December | 32°F | 20°F | 25.8°F | 1.69 | 9 | <1 | 30 | 8 h 30 min |
| Year (annual) | 58°F | 33°F | 45.6°F | 12.52 | 74 | 25 | 174 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −7°C | −3.5°C | 41 mm |
| February | 3°C | −6°C | −1.2°C | 22 mm |
| March | 9°C | −3°C | 3.1°C | 32 mm |
| April | 14°C | −1°C | 6.8°C | 24 mm |
| May | 20°C | 4°C | 11.9°C | 30 mm |
| June | 24°C | 7°C | 15.1°C | 24 mm |
| July | 29°C | 10°C | 19.7°C | 17 mm |
| August | 29°C | 9°C | 19.3°C | 7 mm |
| September | 24°C | 5°C | 14.5°C | 11 mm |
| October | 15°C | 0°C | 7.4°C | 26 mm |
| November | 6°C | −4°C | 1.1°C | 41 mm |
| December | 0°C | −7°C | −3.4°C | 43 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00459238; 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 Wilbur?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (3).
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 USC00459238.
When is the last frost in Wilbur?
In Wilbur, the last spring frost (32°F) comes after June 1 in half of years and after June 22 in one year in ten; the first autumn frost comes before September 22 in half of years and before September 2 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 11 year in 10 after June 22; 9 in 10 after May 10
- First autumn frost, half of years before
- September 221 year in 10 before September 2; 9 in 10 before October 5
NOAA puts the median frost-free season at 112 days, and the season without a hard freeze (28°F) at 148 days.
A hard freeze (28°F) comes after May 8 in half of springs and before October 3 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Wilbur in zone 6b in ZIP code 99185, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Wilbur's NOAA station is in zone 6a: the coldest night of a typical year reaches −5°F (24 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 Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00459238; 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 Wilbur?
In a normal year in Wilbur, 25 days a year reach 90°F (2 of them 100°F or more), 174 nights fall to 32°F or colder and 74 days bring measurable precipitation.
- Days at 90°F or more
- 25a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 174a normal year
- Days that stay below freezing
- 38high of 32°F or less
- Days with 0.01 inch of precipitation
- 74a normal year
The highest temperature in this station's record (since 1892) is 110°F, on June 30, 2021; the lowest is −27°F, on January 9, 1909.
The wettest calendar year on that record is 1906, with 18.20 in; the snowiest season is 1974–75, with 57.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00459238; records: ACIS (NOAA Regional Climate Centers), station USC00459238. Records use complete months only; a month missing more than three days is left out.
How sunny is Wilbur?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Wilbur, 4.1 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 55% | 1.1 |
| February | 69% | 2.3 |
| March | 71% | 3.5 |
| April | 78% | 5.2 |
| May | 80% | 6.4 |
| June | 81% | 7.0 |
| July | 92% | 7.5 |
| August | 91% | 6.3 |
| September | 86% | 4.6 |
| October | 78% | 2.9 |
| November | 64% | 1.5 |
| December | 53% | 0.9 |
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 Wilbur need?
A normal year in Wilbur brings 7,346 heating degree days, 37% more than the median U.S. place (5,373), and 293 cooling degree days, 68% 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 1,813 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,220 | 0 |
| February | 986 | 0 |
| March | 853 | 0 |
| April | 626 | 0 |
| May | 366 | 6 |
| June | 198 | 25 |
| July | 53 | 129 |
| August | 60 | 111 |
| September | 228 | 22 |
| October | 611 | 0 |
| November | 933 | 0 |
| December | 1,215 | 0 |
| Year (annual) | 7,346 | 293 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00459238. 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 Wilbur been warmer than normal lately?
2025 averaged 48.3°F, 2.7°F above the 1991-2020 normal of 45.6°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.1°F | +1.5°F | 7.58 |
| 2024 | 47.4°F | +1.8°F | 12.23 |
| 2025 | 48.3°F | +2.7°F | 10.21 |
Over 73 complete years from 1901 to 2025, the station's annual mean temperature rose at a fitted 1.6°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00459238; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Wilbur's climate compare?
Wilbur is warmer than 5 of the other 95 places with their own NOAA record in Washington, and wetter than 22. Across the 7,247 U.S. stations with normals, its annual mean of 45.6°F is warmer than 22%.
In the Köppen classification computed from these normals, Wilbur is Dsb: continental, dry-summer, warm summer. 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 Wilbur share this climate record?
Creston has no NOAA station with 1991-2020 normals of its 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.
- Creston, WA247 people · 10 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Wilbur's climate
What is the coldest month in Wilbur?
January, with a normal high of 32°F and a normal low of 20°F. The warmest is July (85°F by day, 50°F at night).
What is the rainiest month in Wilbur?
December, with 1.69 in of precipitation in a normal year; the driest is August with 0.27 in.
What plant hardiness zone is Wilbur in?
The USDA's 2023 map puts Wilbur in zone 6b in ZIP code 99185, the nearest ZIP area. By the same method at Wilbur's NOAA station, the coldest night of a typical year reaches −5°F (24 years, 1991-2020): zone 6a.
How late can frost come in Wilbur?
In half of years the last 32°F night comes after June 1; in one year in ten it comes after June 22. Waiting until June 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Coulee Dam, WA18 miles from this station, 49.9°F a year
- Hartline, WA19 miles from this station, 48.8°F a year
- Davenport, WA27 miles from this station, 44.5°F a year
- Harrington, WA30 miles from this station, 47.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made