Hazel Dell, Washington climate: Normal weather by month, frost dates and records
Hazel Dell's normal year runs from 32°F December nights to 79°F August afternoons, with 42.3 inches of precipitation and less than an inch of snow (0.8 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.6°C, December lows of 0°C, August highs of 26°C, 1,074 mm of precipitation a year.
- NOAA stationVancouver (4 mi NNE)
- Station IDUSC00458773
- Location45.68°N 122.65°W
- Elevation210 ft (64 m)
- From the centerunder 1 mile
- Population (census place)23,086
On October 14, the normal high in Hazel Dell is 63°F and the normal low 41°F, and the chance of measurable rain or snow is 43%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hazel Dell.
- Jan 45° 32°
- Feb 49° 32°
- Mar 54° 35°
- Apr 59° 38°
- May 66° 44°
- Jun 71° 49°
- Jul 78° 53°
- Aug 79° 52°
- Sep 74° 47°
- Oct 62° 41°
- Nov 51° 36°
- Dec 45° 32°
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 Hazel Dell each month?
August is the warmest month, with normal highs of 79°F; December the coldest, with normal lows of 32°F. The most precipitation falls in December (6.79 in), the least in July (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 45°F | 32°F | 38.6°F | 6.05 | 20 | <1 | 14 | 9 h |
| February | 49°F | 32°F | 40.6°F | 4.14 | 16 | <1 | 13 | 10 h 20 min |
| March | 54°F | 35°F | 44.4°F | 4.43 | 18 | <1 | 9 | 11 h 50 min |
| April | 59°F | 38°F | 48.7°F | 3.58 | 17 | <1 | 3 | 13 h 30 min |
| May | 66°F | 44°F | 55.2°F | 2.81 | 14 | <1 | <1 | 14 h 50 min |
| June | 71°F | 49°F | 59.8°F | 1.84 | 10 | 1 | <1 | 15 h 40 min |
| July | 78°F | 53°F | 65.4°F | 0.48 | 4 | 3 | <1 | 15 h 20 min |
| August | 79°F | 52°F | 65.5°F | 0.62 | 4 | 4 | <1 | 14 h 10 min |
| September | 74°F | 47°F | 60.3°F | 1.61 | 8 | 1 | <1 | 12 h 40 min |
| October | 62°F | 41°F | 51.3°F | 3.61 | 14 | <1 | 3 | 11 h |
| November | 51°F | 36°F | 43.5°F | 6.31 | 19 | <1 | 9 | 9 h 30 min |
| December | 45°F | 32°F | 38.2°F | 6.79 | 20 | <1 | 14 | 8 h 40 min |
| Year (annual) | 61°F | 41°F | 51.0°F | 42.27 | 163 | 10 | 66 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 7°C | 0°C | 3.7°C | 154 mm |
| February | 10°C | 0°C | 4.8°C | 105 mm |
| March | 12°C | 2°C | 6.9°C | 113 mm |
| April | 15°C | 4°C | 9.3°C | 91 mm |
| May | 19°C | 7°C | 12.9°C | 71 mm |
| June | 22°C | 9°C | 15.4°C | 47 mm |
| July | 26°C | 12°C | 18.6°C | 12 mm |
| August | 26°C | 11°C | 18.6°C | 16 mm |
| September | 23°C | 8°C | 15.7°C | 41 mm |
| October | 17°C | 5°C | 10.7°C | 92 mm |
| November | 11°C | 2°C | 6.4°C | 160 mm |
| December | 7°C | 0°C | 3.4°C | 172 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00458773; 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 Hazel Dell?
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 USC00458773.
When is the last frost in Hazel Dell?
In Hazel Dell, the last spring frost (32°F) comes after April 26 in half of years and after May 10 in one year in ten; the first autumn frost comes before October 18 in half of years and before October 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
- April 261 year in 10 after May 10; 9 in 10 after April 7
- First autumn frost, half of years before
- October 181 year in 10 before October 1; 9 in 10 before November 8
NOAA puts the median frost-free season at 177 days, and the season without a hard freeze (28°F) at 221 days.
A hard freeze (28°F) comes after March 30 in half of springs and before November 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hazel Dell in zone 8b in ZIP code 98665. By the map's own method, the average of each year's coldest night over 1991-2020, Hazel Dell's NOAA station is in zone 8b: the coldest night of a typical year reaches 15°F (28 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 USC00458773; 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 Hazel Dell?
In a normal year in Hazel Dell, 10 days a year reach 90°F (1 of them 100°F or more), 66 nights fall to 32°F or colder and 163 days bring measurable precipitation.
- Days at 90°F or more
- 10a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 66a normal year
- Days that stay below freezing
- 2high of 32°F or less
- Days with 0.01 inch of precipitation
- 163a normal year
The highest temperature in this station's record (since 1891) is 112°F, on June 29, 2021; the lowest is −10°F, on December 13, 1919.
The wettest calendar year on that record is 1983, with 56.28 in; the snowiest season is 1979–80, with 44.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00458773; records: ACIS (NOAA Regional Climate Centers), station USC00458773. Records use complete months only; a month missing more than three days is left out.
How sunny is Hazel Dell?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hazel Dell, 3.7 kWh per square metre a day. July is the sunniest month (83%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.2 |
| February | 60% | 2.1 |
| March | 59% | 3.0 |
| April | 63% | 4.3 |
| May | 68% | 5.4 |
| June | 70% | 6.0 |
| July | 83% | 6.8 |
| August | 83% | 5.8 |
| September | 78% | 4.3 |
| October | 67% | 2.6 |
| November | 56% | 1.4 |
| December | 52% | 1.0 |
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 Hazel Dell need?
A normal year in Hazel Dell brings 5,295 heating degree days, 1% fewer than the median U.S. place (5,373), and 192 cooling degree days, 79% 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 1,916 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 818 | 0 |
| February | 685 | 0 |
| March | 637 | 0 |
| April | 489 | 0 |
| May | 309 | 5 |
| June | 175 | 20 |
| July | 60 | 72 |
| August | 57 | 74 |
| September | 161 | 20 |
| October | 425 | 0 |
| November | 647 | 0 |
| December | 832 | 0 |
| Year (annual) | 5,295 | 192 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00458773. 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 Hazel Dell been warmer than normal lately?
2023 averaged 52.4°F, 1.4°F above the 1991-2020 normal of 51.0°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.0°F | +1.0°F | 40.34 |
| 2022 | 51.2°F | +0.2°F | 41.83 |
| 2023 | 52.4°F | +1.4°F | 44.87 |
Over 128 complete years from 1850 to 2023, the station's annual mean temperature rose at a fitted 1.2°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00458773; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hazel Dell's climate compare?
Hazel Dell is warmer than 60 of the other 95 places with their own NOAA record in Washington, and wetter than 62. Across the 7,247 U.S. stations with normals, its annual mean of 51.0°F is warmer than 45%.
In the Köppen classification computed from these normals, Hazel Dell is Csb: temperate, 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.
Questions about Hazel Dell's climate
What is the coldest month in Hazel Dell?
December, with a normal high of 45°F and a normal low of 32°F. The warmest is August (79°F by day, 52°F at night).
Does it snow in Hazel Dell?
Rarely: NOAA's normal is 0.8 inch a year.
What is the rainiest month in Hazel Dell?
December, with 6.79 in of precipitation in a normal year; the driest is July with 0.48 in.
What plant hardiness zone is Hazel Dell in?
The USDA's 2023 map puts Hazel Dell in zone 8b in ZIP code 98665. By the same method at Hazel Dell's NOAA station, the coldest night of a typical year reaches 15°F (28 years, 1991-2020): zone 8b.
How late can frost come in Hazel Dell?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 10. Waiting until May 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Vancouver, WA4 miles from this station, 54.0°F a year
- Portland, OR6 miles from this station, 55.1°F a year
- Battle Ground, WA9 miles from this station, 50.9°F a year
- Scappoose, OR12 miles from this station, 53.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made