Chewelah, Washington climate: Normal weather by month, frost dates and records
Chewelah's normal year runs from 20°F January nights to 86°F July afternoons, with 21.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, January lows of −6°C, July highs of 30°C, 543 mm of precipitation a year.
- NOAA stationChewelah
- Station IDUSC00451395
- Location48.27°N 117.74°W
- Elevation1,670 ft (509 m)
- From the center1 miles
- Population2,687
On October 23, the normal high in Chewelah is 55°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Chewelah.
- Jan 33° 20°
- Feb 40° 21°
- Mar 50° 27°
- Apr 60° 33°
- May 70° 40°
- Jun 76° 46°
- Jul 86° 49°
- Aug 86° 47°
- Sep 76° 39°
- Oct 59° 31°
- Nov 42° 26°
- Dec 33° 21°
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 Chewelah each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 20°F. The most precipitation falls in November (2.37 in), the least in August (0.72 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 20°F | 26.6°F | 2.22 | – | <1 | 29 | 8 h 40 min |
| February | 40°F | 21°F | 30.5°F | 1.85 | – | <1 | 25 | 10 h 10 min |
| March | 50°F | 27°F | 38.5°F | 2.21 | – | <1 | 24 | 11 h 50 min |
| April | 60°F | 33°F | 46.5°F | 1.86 | – | <1 | 15 | 13 h 40 min |
| May | 70°F | 40°F | 55.2°F | 2.03 | – | 1 | 4 | 15 h 10 min |
| June | 76°F | 46°F | 60.6°F | 2.05 | – | 3 | <1 | 16 h |
| July | 86°F | 49°F | 67.5°F | 0.99 | – | 14 | <1 | 15 h 40 min |
| August | 86°F | 47°F | 66.5°F | 0.72 | – | 14 | <1 | 14 h 20 min |
| September | 76°F | 39°F | 57.5°F | 0.95 | – | 3 | 4 | 12 h 40 min |
| October | 59°F | 31°F | 45.0°F | 1.78 | – | <1 | 18 | 11 h |
| November | 42°F | 26°F | 34.1°F | 2.37 | – | <1 | 23 | 9 h 20 min |
| December | 33°F | 21°F | 26.8°F | 2.33 | – | <1 | 29 | 8 h 20 min |
| Year (annual) | 59°F | 33°F | 46.3°F | 21.36 | – | 34 | 170 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −6°C | −3.0°C | 56 mm |
| February | 4°C | −6°C | −0.8°C | 47 mm |
| March | 10°C | −3°C | 3.6°C | 56 mm |
| April | 16°C | 0°C | 8.1°C | 47 mm |
| May | 21°C | 5°C | 12.9°C | 52 mm |
| June | 24°C | 8°C | 15.9°C | 52 mm |
| July | 30°C | 9°C | 19.7°C | 25 mm |
| August | 30°C | 8°C | 19.2°C | 18 mm |
| September | 24°C | 4°C | 14.2°C | 24 mm |
| October | 15°C | −1°C | 7.2°C | 45 mm |
| November | 6°C | −3°C | 1.2°C | 60 mm |
| December | 1°C | −6°C | −2.9°C | 59 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Colville (22 miles away), gets 43 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00451395; 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 Chewelah?
Normal highs sit between 65°F and 85°F in May, June and September.
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 USC00451395.
When is the last frost in Chewelah?
In Chewelah, the last spring frost (32°F) comes after May 16 in half of years and after June 7 in one year in ten; the first autumn frost comes before September 15 in half of years and before September 1 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 161 year in 10 after June 7; 9 in 10 after April 30
- First autumn frost, half of years before
- September 151 year in 10 before September 1; 9 in 10 before September 29
NOAA puts the median frost-free season at 120 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after April 30 in half of springs and before September 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Chewelah in zone 6a in ZIP code 99109, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Chewelah's NOAA station is in zone 6a: the coldest night of a typical year reaches −8°F (17 complete years).
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00451395; 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 Chewelah?
In a normal year in Chewelah, 34 days a year reach 90°F (4 of them 100°F or more) and 170 nights fall to 32°F or colder.
- Days at 90°F or more
- 34a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 170a normal year
- Days that stay below freezing
- 29high of 32°F or less
The highest temperature in this station's record (since 1925) is 110°F, on June 30, 2021; the lowest is −38°F, on January 30, 1950.
The wettest calendar year on that record is 1983, with 28.25 in; the snowiest season is 1964–65, with 81.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00451395; records: ACIS (NOAA Regional Climate Centers), station USC00451395. Records use complete months only; a month missing more than three days is left out.
How sunny is Chewelah?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Chewelah, 3.6 kWh per square metre a day. July is the sunniest month (87%) and December the cloudiest (48%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 50% | 1.0 |
| February | 60% | 1.9 |
| March | 59% | 2.9 |
| April | 65% | 4.4 |
| May | 71% | 5.7 |
| June | 70% | 6.0 |
| July | 87% | 7.2 |
| August | 86% | 5.9 |
| September | 79% | 4.2 |
| October | 68% | 2.4 |
| November | 53% | 1.2 |
| December | 48% | 0.8 |
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 Chewelah need?
A normal year in Chewelah brings 7,065 heating degree days, 31% more than the median U.S. place (5,373), and 261 cooling degree days, 71% 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 1,864 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,190 | 0 |
| February | 965 | 0 |
| March | 823 | 0 |
| April | 555 | 0 |
| May | 310 | 6 |
| June | 159 | 27 |
| July | 45 | 121 |
| August | 51 | 96 |
| September | 236 | 10 |
| October | 620 | 0 |
| November | 927 | 0 |
| December | 1,184 | 0 |
| Year (annual) | 7,065 | 261 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00451395. 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 Chewelah been warmer than normal lately?
2022 averaged 44.9°F, 1.4°F below the 1991-2020 normal of 46.3°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.8°F | +1.5°F | – |
| 2022 | 44.9°F | −1.4°F | – |
Over 62 complete years from 1926 to 2022, the station's annual mean temperature rose at a fitted 1.1°F per century (+0.06°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00451395; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Chewelah's climate compare?
Chewelah is warmer than 8 of the other 95 places with their own NOAA record in Washington, and wetter than 44. 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, Chewelah 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 Chewelah share this climate record?
4 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.
- Springdale, WA360 people · 15 mi S
- Addy, WA122 people · 7 mi NW
- Twin Lakes, WA101 people · 28 mi W
- Valley, WA93 people · 7 mi S
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 Chewelah's climate
What is the coldest month in Chewelah?
January, with a normal high of 33°F and a normal low of 20°F. The warmest is July (86°F by day, 49°F at night).
Does it snow in Chewelah?
Yes. NOAA publishes no 1991-2020 snowfall normal for Chewelah's NOAA station; the nearest record that keeps one, Colville (22 miles away), records 43 inches of snow in a normal year.
What is the rainiest month in Chewelah?
November, with 2.37 in of precipitation in a normal year; the driest is August with 0.72 in.
What plant hardiness zone is Chewelah in?
The USDA's 2023 map puts Chewelah in zone 6a in ZIP code 99109, the nearest ZIP area. By the same method at Chewelah's NOAA station, the coldest night of a typical year reaches −8°F (17 years, 1991-2020): zone 6a.
How late can frost come in Chewelah?
In half of years the last 32°F night comes after May 16; 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
- Washington climateThe statewide normals and every place in the state
- Colville, WA22 miles from this station, 48.9°F a year
- Deer Park, WA25 miles from this station, 45.5°F a year
- Newport, WA32 miles from this station, 46.2°F a year
- Priest River Experiment Station, ID42 miles from this station, 44.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made