Westfall, Oregon climate: Climate normals at a NOAA weather station
Westfall's normal year runs from 21°F December nights to 92°F July afternoons, with 10.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.2°C, December lows of −6°C, July highs of 33°C, 253 mm of precipitation a year.
- NOAA stationWestfall
- Station IDUSC00359176
- Location43.99°N 117.72°W
- Elevation3,040 ft (927 m)
On October 23, the normal high in Westfall is 62°F and the normal low 31°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Westfall.
- Jan 38° 21°
- Feb 45° 24°
- Mar 56° 30°
- Apr 64° 34°
- May 73° 43°
- Jun 81° 50°
- Jul 92° 57°
- Aug 90° 55°
- Sep 80° 45°
- Oct 65° 34°
- Nov 48° 26°
- Dec 38° 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 at Westfall each month?
July is the warmest month, with normal highs of 92°F; December the coldest, with normal lows of 21°F. The most precipitation falls in December (1.43 in), the least in September (0.32 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 38°F | 21°F | 29.6°F | 1.16 | 10 | <1 | 30 | 9 h 10 min |
| February | 45°F | 24°F | 34.6°F | 0.88 | 7 | <1 | 25 | 10 h 30 min |
| March | 56°F | 30°F | 42.8°F | 0.86 | 7 | <1 | 22 | 11 h 50 min |
| April | 64°F | 34°F | 48.9°F | 0.88 | 8 | <1 | 12 | 13 h 20 min |
| May | 73°F | 43°F | 57.6°F | 1.14 | 7 | 1 | 3 | 14 h 40 min |
| June | 81°F | 50°F | 65.2°F | 0.74 | 7 | 5 | <1 | 15 h 30 min |
| July | 92°F | 57°F | 74.6°F | 0.44 | 3 | 20 | <1 | 15 h 10 min |
| August | 90°F | 55°F | 72.6°F | 0.45 | 2 | 17 | <1 | 14 h |
| September | 80°F | 45°F | 62.9°F | 0.32 | 3 | 5 | 2 | 12 h 40 min |
| October | 65°F | 34°F | 49.6°F | 0.71 | 5 | <1 | 15 | 11 h 10 min |
| November | 48°F | 26°F | 37.0°F | 0.97 | 8 | <1 | 24 | 9 h 40 min |
| December | 38°F | 21°F | 29.5°F | 1.43 | 9 | <1 | 30 | 9 h |
| Year (annual) | 64°F | 37°F | 50.4°F | 9.98 | 74 | 49 | 162 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −6°C | −1.3°C | 29 mm |
| February | 7°C | −4°C | 1.4°C | 22 mm |
| March | 13°C | −1°C | 6.0°C | 22 mm |
| April | 18°C | 1°C | 9.4°C | 22 mm |
| May | 23°C | 6°C | 14.2°C | 29 mm |
| June | 27°C | 10°C | 18.4°C | 19 mm |
| July | 33°C | 14°C | 23.7°C | 11 mm |
| August | 32°C | 13°C | 22.6°C | 11 mm |
| September | 27°C | 7°C | 17.2°C | 8 mm |
| October | 19°C | 1°C | 9.8°C | 18 mm |
| November | 9°C | −3°C | 2.8°C | 25 mm |
| December | 3°C | −6°C | −1.4°C | 36 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 USC00359176; 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.
Which months are mildest at Westfall?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September 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 USC00359176.
When is the last frost at Westfall?
In Westfall, the last spring frost (32°F) comes after May 7 in half of years and after May 28 in one year in ten; the first autumn frost comes before October 3 in half of years and before September 19 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 71 year in 10 after May 28; 9 in 10 after April 23
- First autumn frost, half of years before
- October 31 year in 10 before September 19; 9 in 10 before October 14
NOAA puts the median frost-free season at 147 days, and the season without a hard freeze (28°F) at 172 days.
A hard freeze (28°F) comes after April 24 in half of springs and before October 13 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Westfall in zone 6a in ZIP code 97920, the nearest ZIP area.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00359176; 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 at Westfall?
In a normal year in Westfall, 49 days a year reach 90°F (5 of them 100°F or more), 162 nights fall to 32°F or colder and 74 days bring measurable precipitation.
- Days at 90°F or more
- 49a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 162a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 74a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00359176.
How sunny is it at Westfall?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Westfall, 4.5 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 61% | 1.6 |
| February | 68% | 2.6 |
| March | 72% | 4.0 |
| April | 77% | 5.5 |
| May | 79% | 6.6 |
| June | 85% | 7.5 |
| July | 92% | 7.7 |
| August | 91% | 6.7 |
| September | 88% | 5.2 |
| October | 82% | 3.5 |
| November | 72% | 2.1 |
| December | 58% | 1.3 |
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 many heating and cooling degree days does Westfall record?
A normal year at Westfall brings 6,020 heating degree days, 12% more than the median U.S. place (5,373), and 728 cooling degree days, 20% 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 2,722 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,099 | 0 |
| February | 850 | 0 |
| March | 688 | 0 |
| April | 483 | 0 |
| May | 248 | 20 |
| June | 84 | 90 |
| July | 8 | 306 |
| August | 16 | 250 |
| September | 126 | 62 |
| October | 480 | 1 |
| November | 839 | 0 |
| December | 1,100 | 0 |
| Year (annual) | 6,020 | 728 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00359176. 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 Westfall's climate compare?
Westfall is warmer than 37 of the 105 places with their own NOAA record in Oregon, and wetter than 6. Across the 7,247 U.S. stations with normals, its annual mean of 50.4°F is warmer than 42%.
In the Köppen classification computed from these normals, Westfall is BSk: cold semi-arid steppe. 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 Westfall share this climate record?
Harper 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.
- Harper, OR159 people · 10 mi SE
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 Westfall's climate
What is the coldest month at Westfall?
December, with a normal high of 38°F and a normal low of 21°F. The warmest is July (92°F by day, 57°F at night).
What is the rainiest month at Westfall?
December, with 1.43 in of precipitation in a normal year; the driest is September with 0.32 in.
What plant hardiness zone is Westfall in?
The USDA's 2023 map puts Westfall in zone 6a in ZIP code 97920, the nearest ZIP area.
How late can frost come at Westfall?
In half of years the last 32°F night comes after May 7; in one year in ten it comes after May 28. Waiting until May 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Vale, OR24 miles from this station, 49.9°F a year
- Owyhee Dam, OR34 miles from this station, 51.3°F a year
- Huntington, OR34 miles from this station, 52.5°F a year
- Malheur Branch Experiment Station, OR35 miles from this station, 52.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made