Glenoma, Washington climate: Climate normals at a NOAA weather station
Glenoma's normal year runs from 32°F December nights to 79°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.0°C, December lows of 0°C, July highs of 26°C.
- NOAA stationGlenoma
- Station IDUSC00453177
- Location46.52°N 122.14°W
- Elevation840 ft (256 m)
On October 23, the normal high in Glenoma is 57°F and the normal low 38°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Glenoma.
- Jan 45° 32°
- Feb 49° 32°
- Mar 53° 34°
- Apr 59° 37°
- May 67° 42°
- Jun 72° 47°
- Jul 79° 50°
- Aug 80° 48°
- Sep 73° 44°
- Oct 61° 39°
- Nov 50° 34°
- Dec 44° 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 at Glenoma each month?
July is the warmest month, with normal highs of 79°F; December the coldest, with normal lows of 32°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 45°F | 32°F | 38.3°F | – | <1 | 15 | 9 h |
| February | 49°F | 32°F | 40.1°F | – | <1 | 13 | 10 h 20 min |
| March | 53°F | 34°F | 43.6°F | – | <1 | 12 | 11 h 50 min |
| April | 59°F | 37°F | 48.0°F | – | <1 | 5 | 13 h 30 min |
| May | 67°F | 42°F | 54.6°F | – | <1 | 2 | 15 h |
| June | 72°F | 47°F | 59.3°F | – | 1 | <1 | 15 h 50 min |
| July | 79°F | 50°F | 64.4°F | – | 3 | <1 | 15 h 30 min |
| August | 80°F | 48°F | 63.8°F | – | 2 | <1 | 14 h 20 min |
| September | 73°F | 44°F | 58.4°F | – | 1 | 1 | 12 h 40 min |
| October | 61°F | 39°F | 50.0°F | – | <1 | 6 | 11 h |
| November | 50°F | 34°F | 41.8°F | – | <1 | 11 | 9 h 30 min |
| December | 44°F | 32°F | 38.0°F | – | <1 | 16 | 8 h 40 min |
| Year (annual) | 61°F | 39°F | 50.0°F | – | 7 | 82 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 7°C | 0°C | 3.5°C |
| February | 9°C | 0°C | 4.5°C |
| March | 12°C | 1°C | 6.4°C |
| April | 15°C | 3°C | 8.9°C |
| May | 19°C | 6°C | 12.6°C |
| June | 22°C | 8°C | 15.2°C |
| July | 26°C | 10°C | 18.0°C |
| August | 27°C | 9°C | 17.7°C |
| September | 23°C | 7°C | 14.7°C |
| October | 16°C | 4°C | 10.0°C |
| November | 10°C | 1°C | 5.4°C |
| December | 7°C | 0°C | 3.3°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Mayfield Power Plant (22 miles away), gets 3 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00453177; 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 Glenoma?
Normal highs sit between 65°F and 85°F in May, June, July, August 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 USC00453177.
When is the last frost at Glenoma?
In Glenoma, the last spring frost (32°F) comes after April 24 in half of years and after May 12 in one year in ten; the first autumn frost comes before October 15 in half of years and before September 24 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 241 year in 10 after May 12; 9 in 10 after March 31
- First autumn frost, half of years before
- October 151 year in 10 before September 24; 9 in 10 before November 8
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 224 days.
A hard freeze (28°F) comes after March 26 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Glenoma in zone 8a in ZIP code 98336, 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 USC00453177; 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 Glenoma?
In a normal year in Glenoma, 7 days a year reach 90°F and 82 nights fall to 32°F or colder.
- Days at 90°F or more
- 7a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 82a normal year
- Days that stay below freezing
- 1high of 32°F or less
The highest temperature in this station's record (since 1905) is 108°F, on September 3, 1988; the lowest is −11°F, on January 31, 1950.
The wettest calendar year on that record is 1997, with 86.24 in; the snowiest season is 1949–50, with 102.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00453177; records: ACIS (NOAA Regional Climate Centers), station USC00453177. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Glenoma?
Over a year 67% of the sunlight that would reach the ground under clear skies gets through the clouds at Glenoma, 3.5 kWh per square metre a day. July is the sunniest month (78%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.1 |
| February | 59% | 2.0 |
| March | 57% | 2.9 |
| April | 62% | 4.2 |
| May | 66% | 5.2 |
| June | 67% | 5.7 |
| July | 78% | 6.4 |
| August | 78% | 5.4 |
| September | 75% | 4.0 |
| October | 65% | 2.4 |
| November | 55% | 1.3 |
| December | 52% | 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 many heating and cooling degree days does Glenoma record?
A normal year at Glenoma brings 5,569 heating degree days, 4% more than the median U.S. place (5,373), and 126 cooling degree days, 86% 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 1,713 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 828 | 0 |
| February | 696 | 0 |
| March | 665 | 0 |
| April | 512 | 0 |
| May | 327 | 4 |
| June | 185 | 16 |
| July | 72 | 54 |
| August | 82 | 44 |
| September | 206 | 8 |
| October | 467 | 0 |
| November | 696 | 0 |
| December | 835 | 0 |
| Year (annual) | 5,569 | 126 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00453177. 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 Glenoma's climate compare?
Glenoma is warmer than 40 of the 96 places with their own NOAA record in Washington. Across the 7,247 U.S. stations with normals, its annual mean of 50.0°F is warmer than 40%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Glenoma share this climate record?
5 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.
- Morton, WA1,089 people · 7 mi W
- La Grande, WA262 people · 21 mi N
- Alder, WA77 people · 19 mi N
- Mineral, WA46 people · 14 mi N
- Elbe, WA0 people · 17 mi N
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 Glenoma's climate
What is the coldest month at Glenoma?
December, with a normal high of 44°F and a normal low of 32°F. The warmest is July (79°F by day, 50°F at night).
Does it snow at Glenoma?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Mayfield Power Plant (22 miles away), records 3 inches of snow in a normal year.
What plant hardiness zone is Glenoma in?
The USDA's 2023 map puts Glenoma in zone 8a in ZIP code 98336, the nearest ZIP area.
How late can frost come at Glenoma?
In half of years the last 32°F night comes after April 24; in one year in ten it comes after May 12. Waiting until May 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Mayfield Power Plant, WA22 miles from this station, 51.7°F a year
- Longmire Rainier NPS, WA22 miles from this station, 44.3°F a year
- Packwood, WA23 miles from this station, 50.5°F a year
- Rainier Paradise Ranger Station, WA26 miles from this station, 38.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made