Deer Park, Washington climate: Normal weather by month, frost dates and records
Deer Park's normal year runs from 21°F December nights to 84°F July afternoons, with 22.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.5°C, December lows of −6°C, July highs of 29°C, 572 mm of precipitation a year.
- NOAA stationDeer Park Airport
- Station IDUSW00094119
- Location47.97°N 117.43°W
- Elevation2,191 ft (668 m)
- Population5,191
On October 23, the normal high in Deer Park is 53°F and the normal low 30°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Deer Park.
- Jan 34° 21°
- Feb 39° 22°
- Mar 49° 27°
- Apr 58° 32°
- May 67° 39°
- Jun 73° 44°
- Jul 84° 48°
- Aug 84° 47°
- Sep 74° 40°
- Oct 58° 32°
- 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 Deer Park each month?
July is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 21°F. The most precipitation falls in December (3.06 in), the least in July (0.61 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 34°F | 21°F | 27.5°F | 2.89 | 15 | <1 | 28 | 8 h 50 min |
| February | 39°F | 22°F | 30.2°F | 1.63 | 11 | <1 | 25 | 10 h 10 min |
| March | 49°F | 27°F | 37.6°F | 2.27 | 14 | <1 | 25 | 11 h 50 min |
| April | 58°F | 32°F | 44.7°F | 1.91 | 11 | <1 | 18 | 13 h 40 min |
| May | 67°F | 39°F | 53.3°F | 1.92 | 11 | <1 | 7 | 15 h 10 min |
| June | 73°F | 44°F | 58.6°F | 1.91 | 10 | 2 | 1 | 16 h |
| July | 84°F | 48°F | 66.3°F | 0.61 | 4 | 10 | <1 | 15 h 40 min |
| August | 84°F | 47°F | 65.5°F | 0.73 | 4 | 9 | <1 | 14 h 20 min |
| September | 74°F | 40°F | 57.0°F | 0.82 | 6 | 2 | 4 | 12 h 40 min |
| October | 58°F | 32°F | 44.6°F | 2.00 | 10 | <1 | 17 | 11 h |
| November | 42°F | 26°F | 34.1°F | 2.77 | 14 | <1 | 22 | 9 h 20 min |
| December | 33°F | 21°F | 27.2°F | 3.06 | 15 | <1 | 28 | 8 h 20 min |
| Year (annual) | 58°F | 33°F | 45.5°F | 22.52 | 124 | 22 | 174 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −6°C | −2.5°C | 73 mm |
| February | 4°C | −6°C | −1.0°C | 41 mm |
| March | 9°C | −3°C | 3.1°C | 58 mm |
| April | 14°C | 0°C | 7.1°C | 49 mm |
| May | 20°C | 4°C | 11.8°C | 49 mm |
| June | 23°C | 7°C | 14.8°C | 49 mm |
| July | 29°C | 9°C | 19.1°C | 15 mm |
| August | 29°C | 8°C | 18.6°C | 19 mm |
| September | 23°C | 4°C | 13.9°C | 21 mm |
| October | 14°C | 0°C | 7.0°C | 51 mm |
| November | 5°C | −3°C | 1.2°C | 70 mm |
| December | 1°C | −6°C | −2.7°C | 78 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Spokane Weather Office (22 miles away), gets 48 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094119; 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 Deer Park?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, July has the fewest days with rain (4).
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 USW00094119.
When is the last frost in Deer Park?
In Deer Park, the last spring frost (32°F) comes after May 22 in half of years and after June 15 in one year in ten; the first autumn frost comes before September 14 in half of years and before August 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
- May 221 year in 10 after June 15; 9 in 10 after May 2
- First autumn frost, half of years before
- September 141 year in 10 before August 28; 9 in 10 before October 1
NOAA puts the median frost-free season at 112 days, and the season without a hard freeze (28°F) at 146 days.
A hard freeze (28°F) comes after May 3 in half of springs and before September 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Deer Park in zone 6b in ZIP code 99006, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Deer Park's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (22 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 USW00094119; 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 Deer Park?
In a normal year in Deer Park, 22 days a year reach 90°F (1 of them 100°F or more), 174 nights fall to 32°F or colder and 124 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 174a normal year
- Days that stay below freezing
- 33high of 32°F or less
- Days with 0.01 inch of precipitation
- 124a normal year
The highest temperature in this station's record (since 1998) is 111°F, on June 29, 2021; the lowest is −28°F, on January 5, 2004.
The wettest calendar year on that record is 2006, with 30.13 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094119; records: ACIS (NOAA Regional Climate Centers), station USW00094119. Records use complete months only; a month missing more than three days is left out.
How sunny is Deer Park?
Over a year 74% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Deer Park, 3.8 kWh per square metre a day. July is the sunniest month (90%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 53% | 1.1 |
| February | 62% | 2.0 |
| March | 61% | 3.1 |
| April | 67% | 4.6 |
| May | 74% | 5.9 |
| June | 75% | 6.5 |
| July | 90% | 7.4 |
| August | 88% | 6.1 |
| September | 81% | 4.4 |
| October | 71% | 2.6 |
| November | 56% | 1.3 |
| December | 50% | 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 Deer Park need?
A normal year in Deer Park brings 7,286 heating degree days, 36% more than the median U.S. place (5,373), and 217 cooling degree days, 76% 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 1,685 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,163 | 0 |
| February | 974 | 0 |
| March | 851 | 0 |
| April | 609 | 0 |
| May | 367 | 4 |
| June | 212 | 18 |
| July | 59 | 99 |
| August | 66 | 81 |
| September | 256 | 14 |
| October | 632 | 0 |
| November | 926 | 0 |
| December | 1,172 | 0 |
| Year (annual) | 7,286 | 217 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094119. 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 Deer Park been warmer than normal lately?
2025 averaged 48.5°F, 3.0°F above the 1991-2020 normal of 45.5°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 47.5°F | +2.0°F | 15.58 |
| 2022 | 45.2°F | −0.3°F | 20.80 |
| 2023 | 47.7°F | +2.2°F | 17.98 |
| 2024 | 47.8°F | +2.3°F | 20.36 |
| 2025 | 48.5°F | +3.0°F | 19.99 |
Source: observed years: ACIS, station USW00094119. A year counts only with all twelve months complete.
How does Deer Park's climate compare?
Deer Park is warmer than 4 of the other 95 places with their own NOAA record in Washington, and wetter than 46. Across the 7,247 U.S. stations with normals, its annual mean of 45.5°F is warmer than 21%.
In the Köppen classification computed from these normals, Deer Park 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 Deer Park 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.
- Suncrest, WA5,590 people · 13 mi SW
- Loon Lake, WA927 people · 11 mi NW
- Green Bluff, WA238 people · 13 mi SE
- Clayton, WA220 people · 6 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.
Questions about Deer Park's climate
What is the coldest month in Deer Park?
December, with a normal high of 33°F and a normal low of 21°F. The warmest is July (84°F by day, 48°F at night).
Does it snow in Deer Park?
Yes. NOAA publishes no 1991-2020 snowfall normal for Deer Park's NOAA station; the nearest record that keeps one, Spokane Weather Office (22 miles away), records 48 inches of snow in a normal year.
What is the rainiest month in Deer Park?
December, with 3.06 in of precipitation in a normal year; the driest is July with 0.61 in.
What plant hardiness zone is Deer Park in?
The USDA's 2023 map puts Deer Park in zone 6b in ZIP code 99006, the nearest ZIP area. By the same method at Deer Park's NOAA station, the coldest night of a typical year reaches −9°F (22 years, 1991-2020): zone 6a.
How late can frost come in Deer Park?
In half of years the last 32°F night comes after May 22; in one year in ten it comes after June 15. Waiting until June 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Newport, WA23 miles from this station, 46.2°F a year
- Spokane, WA25 miles from this station, 48.6°F a year
- Chewelah, WA25 miles from this station, 46.3°F a year
- Coeur d'Alene, ID35 miles from this station, 48.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made