Boardman, Oregon climate: Normal weather by month, frost dates and records
Boardman's normal year runs from 29°F January nights to 91°F July afternoons, with 8.6 inches of precipitation and 4 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.2°C, January lows of −2°C, July highs of 33°C, 217 mm of precipitation a year.
- NOAA stationBoardman
- Station IDUSC00350858
- Location45.85°N 119.69°W
- Elevation280 ft (85 m)
- Population4,345
On October 23, the normal high in Boardman is 62°F and the normal low 38°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Boardman.
- Jan 42° 29°
- Feb 48° 30°
- Mar 58° 34°
- Apr 66° 40°
- May 75° 48°
- Jun 82° 55°
- Jul 91° 60°
- Aug 90° 59°
- Sep 81° 50°
- Oct 66° 40°
- Nov 51° 33°
- Dec 42° 29°
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 Boardman each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 29°F. The most precipitation falls in December (1.38 in), the least in July (0.14 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 29°F | 35.3°F | 1.28 | 1.2 | 9 | <1 | 22 | 9 h |
| February | 48°F | 30°F | 38.9°F | 0.92 | 1.4 | 6 | <1 | 19 | 10 h 20 min |
| March | 58°F | 34°F | 45.7°F | 0.70 | 0.2 | 6 | <1 | 15 | 11 h 50 min |
| April | 66°F | 40°F | 53.0°F | 0.64 | 0.0 | 5 | <1 | 4 | 13 h 30 min |
| May | 75°F | 48°F | 61.5°F | 0.80 | 0.0 | 5 | 2 | 1 | 14 h 50 min |
| June | 82°F | 55°F | 68.1°F | 0.55 | 0.0 | 3 | 5 | <1 | 15 h 40 min |
| July | 91°F | 60°F | 75.7°F | 0.14 | 0.0 | 1 | 19 | <1 | 15 h 20 min |
| August | 90°F | 59°F | 74.3°F | 0.18 | 0.0 | 2 | 17 | <1 | 14 h 10 min |
| September | 81°F | 50°F | 65.2°F | 0.25 | 0.0 | 2 | 3 | <1 | 12 h 40 min |
| October | 66°F | 40°F | 53.1°F | 0.74 | 0.1 | 5 | <1 | 6 | 11 h |
| November | 51°F | 33°F | 42.1°F | 0.98 | 0.0 | 7 | <1 | 15 | 9 h 30 min |
| December | 42°F | 29°F | 35.4°F | 1.38 | 0.8 | 10 | <1 | 22 | 8 h 40 min |
| Year (annual) | 66°F | 42°F | 54.0°F | 8.56 | 3.7 | 62 | 46 | 104 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −2°C | 1.8°C | 33 mm | 3 cm |
| February | 9°C | −1°C | 3.8°C | 23 mm | 4 cm |
| March | 14°C | 1°C | 7.6°C | 18 mm | 1 cm |
| April | 19°C | 4°C | 11.7°C | 16 mm | 0 cm |
| May | 24°C | 9°C | 16.4°C | 20 mm | 0 cm |
| June | 28°C | 13°C | 20.1°C | 14 mm | 0 cm |
| July | 33°C | 16°C | 24.3°C | 4 mm | 0 cm |
| August | 32°C | 15°C | 23.5°C | 5 mm | 0 cm |
| September | 27°C | 10°C | 18.4°C | 6 mm | 0 cm |
| October | 19°C | 5°C | 11.7°C | 19 mm | 0 cm |
| November | 11°C | 1°C | 5.6°C | 25 mm | 0 cm |
| December | 5°C | −2°C | 1.9°C | 35 mm | 2 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00350858; 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 Boardman?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, September has the fewest days with rain (2).
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 USC00350858.
When is the last frost in Boardman?
In Boardman, the last spring frost (32°F) comes after April 14 in half of years and after May 2 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 5 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 141 year in 10 after May 2; 9 in 10 after March 28
- First autumn frost, half of years before
- October 211 year in 10 before October 5; 9 in 10 before November 4
NOAA puts the median frost-free season at 188 days, and the season without a hard freeze (28°F) at 218 days.
A hard freeze (28°F) comes after March 28 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Boardman in zone 7b in ZIP code 97818, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Boardman's NOAA station is in zone 7b: the coldest night of a typical year reaches 7°F (24 complete years).
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00350858; 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 Boardman?
In a normal year in Boardman, 46 days a year reach 90°F (7 of them 100°F or more), 104 nights fall to 32°F or colder and 62 days bring measurable precipitation.
- Days at 90°F or more
- 46a normal year
- Days at 100°F or more
- 7a normal year
- Nights at 32°F or colder
- 104a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 62a normal year
- Days with 1 inch of snow or more
- 2a normal year
The highest temperature in this station's record (since 1971) is 115°F, on July 11, 2024; the lowest is −15°F, on December 23, 1983.
The wettest calendar year on that record is 1998, with 12.75 in; the snowiest season is 1978–79, with 20.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00350858; records: ACIS (NOAA Regional Climate Centers), station USC00350858. Records use complete months only; a month missing more than three days is left out.
How sunny is Boardman?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Boardman, 4.2 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 59% | 1.4 |
| February | 65% | 2.3 |
| March | 68% | 3.5 |
| April | 74% | 5.2 |
| May | 77% | 6.2 |
| June | 82% | 7.1 |
| July | 93% | 7.7 |
| August | 91% | 6.5 |
| September | 86% | 4.8 |
| October | 76% | 3.0 |
| November | 64% | 1.6 |
| December | 56% | 1.1 |
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 Boardman need?
A normal year in Boardman brings 4,852 heating degree days, 10% fewer than the median U.S. place (5,373), and 876 cooling degree days, 3% 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 3,212 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 919 | 0 |
| February | 731 | 0 |
| March | 598 | 0 |
| April | 363 | 2 |
| May | 149 | 41 |
| June | 34 | 129 |
| July | 3 | 333 |
| August | 4 | 294 |
| September | 72 | 76 |
| October | 373 | 2 |
| November | 687 | 0 |
| December | 919 | 0 |
| Year (annual) | 4,852 | 876 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00350858. 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 Boardman been warmer than normal lately?
2025 averaged 56.2°F, 2.2°F above the 1991-2020 normal of 54.0°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 56.3°F | +2.3°F | 6.64 | – |
| 2022 | 53.7°F | −0.3°F | 11.18 | 3.0 |
| 2023 | 55.1°F | +1.1°F | 6.42 | – |
| 2025 | 56.2°F | +2.2°F | 10.46 | 0.0 |
Over 33 complete years from 1973 to 2023, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00350858; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Boardman's climate compare?
Boardman is warmer than 85 of the other 104 places with their own NOAA record in Oregon, and wetter than 1. Across the 7,247 U.S. stations with normals, its annual mean of 54.0°F is warmer than 57%.
In the Köppen classification computed from these normals, Boardman 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.
Questions about Boardman's climate
What is the coldest month in Boardman?
January, with a normal high of 42°F and a normal low of 29°F. The warmest is July (91°F by day, 60°F at night).
Does it snow in Boardman?
Yes: 4 inches in a normal year, falling on 2 days with 0.1 inch or more, the most in February (1.4 inches).
What is the rainiest month in Boardman?
December, with 1.38 in of precipitation in a normal year; the driest is July with 0.14 in.
What plant hardiness zone is Boardman in?
The USDA's 2023 map puts Boardman in zone 7b in ZIP code 97818, the nearest ZIP area. By the same method at Boardman's NOAA station, the coldest night of a typical year reaches 7°F (24 years, 1991-2020): zone 7b.
How late can frost come in Boardman?
In half of years the last 32°F night comes after April 14; in one year in ten it comes after May 2. Waiting until May 2 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- McNary Dam #2, OR20 miles from this station, 53.9°F a year
- McNary Dam, WA20 miles from this station, 54.2°F a year
- Hermiston, OR21 miles from this station, 53.9°F a year
- Prosser, WA25 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