Tonasket, Washington climate: Normal weather by month, frost dates and records
Tonasket's normal year runs from 23°F January nights to 88°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.8°C, January lows of −5°C, July highs of 31°C.
- NOAA stationTonasket (4 mi NNE)
- Station IDUSC00458520
- Location48.78°N 119.42°W
- Elevation960 ft (293 m)
- Population1,133
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Tonasket.
- Jan 34° 23°
- Feb 42° 26°
- Mar 54° 31°
- Apr 64° 37°
- May 74° 44°
- Jun 79° 50°
- Jul 88° 55°
- Aug 87° 54°
- Sep 77° 46°
- Oct 61° 37°
- Nov 44° 29°
- Dec 34° 24°
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 Tonasket each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 23°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 34°F | 23°F | 28.6°F | – | <1 | 26 | 8 h 40 min |
| February | 42°F | 26°F | 34.1°F | – | <1 | 21 | 10 h 10 min |
| March | 54°F | 31°F | 42.7°F | – | <1 | 19 | 11 h 50 min |
| April | 64°F | 37°F | 50.7°F | – | <1 | 8 | 13 h 40 min |
| May | 74°F | 44°F | 58.9°F | – | 1 | 1 | 15 h 10 min |
| June | 79°F | 50°F | 64.5°F | – | 4 | <1 | 16 h 10 min |
| July | 88°F | 55°F | 71.7°F | – | 12 | <1 | 15 h 50 min |
| August | 87°F | 54°F | 70.5°F | – | 12 | <1 | 14 h 30 min |
| September | 77°F | 46°F | 61.2°F | – | 1 | <1 | 12 h 40 min |
| October | 61°F | 37°F | 48.6°F | – | <1 | 11 | 10 h 50 min |
| November | 44°F | 29°F | 36.4°F | – | <1 | 20 | 9 h 10 min |
| December | 34°F | 24°F | 28.9°F | – | <1 | 27 | 8 h 20 min |
| Year (annual) | 62°F | 38°F | 49.7°F | – | 30 | 134 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 1°C | −5°C | −1.9°C |
| February | 6°C | −3°C | 1.2°C |
| March | 12°C | 0°C | 5.9°C |
| April | 18°C | 3°C | 10.4°C |
| May | 23°C | 7°C | 14.9°C |
| June | 26°C | 10°C | 18.1°C |
| July | 31°C | 13°C | 22.1°C |
| August | 31°C | 12°C | 21.4°C |
| September | 25°C | 8°C | 16.2°C |
| October | 16°C | 3°C | 9.2°C |
| November | 7°C | −2°C | 2.4°C |
| December | 1°C | −4°C | −1.7°C |
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 USC00458520; 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 Tonasket?
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 USC00458520.
When is the last frost in Tonasket?
In Tonasket, the last spring frost (32°F) comes after April 26 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 10 in half of years and before September 28 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
- April 261 year in 10 after May 11; 9 in 10 after April 6
- First autumn frost, half of years before
- October 101 year in 10 before September 28; 9 in 10 before October 25
NOAA puts the median frost-free season at 168 days, and the season without a hard freeze (28°F) at 203 days.
A hard freeze (28°F) comes after April 1 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Tonasket in zone 6b in ZIP code 98855, the nearest ZIP area.
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00458520; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Tonasket?
In a normal year in Tonasket, 30 days a year reach 90°F (2 of them 100°F or more) and 134 nights fall to 32°F or colder.
- Days at 90°F or more
- 30a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 134a normal year
- Days that stay below freezing
- 27high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00458520.
How sunny is Tonasket?
Over a year 75% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Tonasket, 3.9 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (54%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.1 |
| February | 68% | 2.2 |
| March | 68% | 3.3 |
| April | 71% | 4.8 |
| May | 74% | 5.9 |
| June | 75% | 6.4 |
| July | 88% | 7.2 |
| August | 87% | 6.0 |
| September | 82% | 4.4 |
| October | 73% | 2.6 |
| November | 59% | 1.3 |
| December | 54% | 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 Tonasket need?
A normal year in Tonasket brings 6,054 heating degree days, 13% more than the median U.S. place (5,373), and 512 cooling degree days, 44% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,520 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,128 | 0 |
| February | 864 | 0 |
| March | 693 | 0 |
| April | 431 | 0 |
| May | 206 | 16 |
| June | 77 | 63 |
| July | 9 | 215 |
| August | 20 | 189 |
| September | 142 | 28 |
| October | 509 | 0 |
| November | 858 | 0 |
| December | 1,119 | 0 |
| Year (annual) | 6,054 | 512 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00458520. 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.
How does Tonasket's climate compare?
Tonasket is warmer than 32 of the other 95 places with their own NOAA record in Washington. Across the 7,247 U.S. stations with normals, its annual mean of 49.7°F is warmer than 39%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Tonasket share this climate record?
2 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.
- Oroville, WA1,911 people · 11 mi N
- Loomis, WA102 people · 10 mi W
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 Tonasket's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Tonasket. This page uses Tonasket (4 mi NNE); the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Tonasket (11 mi NE) USC00458521 | 8 mi E | 3,434 ft | 42.6°F | 16°F | 77°F | 17.5 | – | May 6 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Tonasket's climate
What is the coldest month in Tonasket?
January, with a normal high of 34°F and a normal low of 23°F. The warmest is July (88°F by day, 55°F at night).
What plant hardiness zone is Tonasket in?
The USDA's 2023 map puts Tonasket in zone 6b in ZIP code 98855, the nearest ZIP area.
How late can frost come in Tonasket?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Omak, WA22 miles from this station, 49.9°F a year
- Republic, WA33 miles from this station, 43.8°F a year
- Winthrop, WA41 miles from this station, 45.7°F a year
- Mazama, WA47 miles from this station, 45.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made