Richland, Oregon climate: Normal weather by month, frost dates and records
Richland's normal year runs from 22°F January nights to 92°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.7°C, January lows of −6°C, July highs of 33°C.
- NOAA stationRichland
- Station IDUSC00357160
- Location44.77°N 117.16°W
- Elevation2,215 ft (675 m)
- From the centerunder 1 mile
- Population169
On October 23, the normal high in Richland is 60°F and the normal low 30°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Richland.
- Jan 37° 22°
- Feb 44° 25°
- Mar 55° 29°
- Apr 62° 33°
- May 72° 41°
- Jun 81° 48°
- Jul 92° 54°
- Aug 90° 52°
- Sep 80° 43°
- Oct 64° 32°
- Nov 48° 26°
- Dec 39° 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 Richland each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 22°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 37°F | 22°F | 29.5°F | – | <1 | 29 | 9 h 10 min |
| February | 44°F | 25°F | 34.3°F | – | <1 | 24 | 10 h 20 min |
| March | 55°F | 29°F | 41.5°F | – | <1 | 24 | 11 h 50 min |
| April | 62°F | 33°F | 47.1°F | – | <1 | 15 | 13 h 30 min |
| May | 72°F | 41°F | 56.6°F | – | 2 | 4 | 14 h 50 min |
| June | 81°F | 48°F | 64.2°F | – | 6 | <1 | 15 h 30 min |
| July | 92°F | 54°F | 73.0°F | – | 20 | <1 | 15 h 20 min |
| August | 90°F | 52°F | 70.9°F | – | 20 | <1 | 14 h 10 min |
| September | 80°F | 43°F | 61.4°F | – | 5 | 2 | 12 h 40 min |
| October | 64°F | 32°F | 48.3°F | – | <1 | 16 | 11 h |
| November | 48°F | 26°F | 36.6°F | – | <1 | 25 | 9 h 40 min |
| December | 39°F | 21°F | 30.3°F | – | <1 | 28 | 8 h 50 min |
| Year (annual) | 64°F | 35°F | 49.5°F | – | 52 | 167 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 3°C | −6°C | −1.4°C |
| February | 7°C | −4°C | 1.3°C |
| March | 13°C | −2°C | 5.3°C |
| April | 17°C | 0°C | 8.4°C |
| May | 22°C | 5°C | 13.7°C |
| June | 27°C | 9°C | 17.9°C |
| July | 33°C | 12°C | 22.8°C |
| August | 32°C | 11°C | 21.6°C |
| September | 27°C | 6°C | 16.3°C |
| October | 18°C | 0°C | 9.1°C |
| November | 9°C | −4°C | 2.6°C |
| December | 4°C | −6°C | −0.9°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Halfway (8 miles away), gets 62 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357160; 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 Richland?
Normal highs sit between 65°F and 85°F in May, June 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 USC00357160.
When is the last frost in Richland?
In Richland, the last spring frost (32°F) comes after May 10 in half of years and after May 29 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 16 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 101 year in 10 after May 29; 9 in 10 after April 27
- First autumn frost, half of years before
- October 11 year in 10 before September 16; 9 in 10 before October 13
NOAA puts the median frost-free season at 141 days, and the season without a hard freeze (28°F) at 165 days.
A hard freeze (28°F) comes after April 28 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Richland in zone 6b in ZIP code 97870, 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 USC00357160; 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 in Richland?
In a normal year in Richland, 52 days a year reach 90°F (8 of them 100°F or more) and 167 nights fall to 32°F or colder.
- Days at 90°F or more
- 52a normal year
- Days at 100°F or more
- 8a normal year
- Nights at 32°F or colder
- 167a normal year
- Days that stay below freezing
- 13high of 32°F or less
The highest temperature in this station's record (since 1893) is 110°F, on July 31, 1893; the lowest is −27°F, on January 31, 1979.
The wettest calendar year on that record is 1990, with 16.82 in; the snowiest season is 2008–09, with 35.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00357160; records: ACIS (NOAA Regional Climate Centers), station USC00357160. Records use complete months only; a month missing more than three days is left out.
How sunny is Richland?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Richland, 4.4 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% | 1.5 |
| February | 68% | 2.5 |
| March | 70% | 3.8 |
| April | 77% | 5.5 |
| May | 79% | 6.5 |
| June | 83% | 7.3 |
| July | 92% | 7.7 |
| August | 91% | 6.6 |
| September | 87% | 5.0 |
| October | 80% | 3.3 |
| November | 68% | 1.9 |
| December | 58% | 1.2 |
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 Richland need?
A normal year in Richland brings 6,231 heating degree days, 16% more than the median U.S. place (5,373), and 597 cooling degree days, 34% 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 2,484 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,100 | 0 |
| February | 860 | 0 |
| March | 729 | 0 |
| April | 537 | 0 |
| May | 275 | 15 |
| June | 100 | 76 |
| July | 13 | 261 |
| August | 22 | 203 |
| September | 149 | 41 |
| October | 518 | 0 |
| November | 852 | 0 |
| December | 1,076 | 0 |
| Year (annual) | 6,231 | 597 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357160. 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 Richland's climate compare?
Richland is warmer than 33 of the other 104 places with their own NOAA record in Oregon. Across the 7,247 U.S. stations with normals, its annual mean of 49.5°F is warmer than 38%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Questions about Richland's climate
What is the coldest month in Richland?
January, with a normal high of 37°F and a normal low of 22°F. The warmest is July (92°F by day, 54°F at night).
Does it snow in Richland?
Yes. NOAA publishes no 1991-2020 snowfall normal for Richland's NOAA station; the nearest record that keeps one, Halfway (8 miles away), records 62 inches of snow in a normal year.
What plant hardiness zone is Richland in?
The USDA's 2023 map puts Richland in zone 6b in ZIP code 97870, the nearest ZIP area.
How late can frost come in Richland?
In half of years the last 32°F night comes after May 10; in one year in ten it comes after May 29. Waiting until May 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Halfway, OR8 miles from this station, 47.9°F a year
- Brownlee Dam, ID14 miles from this station, 55.0°F a year
- Cambridge, ID27 miles from this station, 48.3°F a year
- Huntington, OR29 miles from this station, 52.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made