Rockville (5 mi N), Oregon climate: Climate normals at a NOAA weather station
Rockville (5 mi N)'s normal year runs from 21°F December nights to 91°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.1°C, December lows of −6°C, July highs of 33°C.
- NOAA stationRockville (5 mi N)
- Station IDUSC00357277
- Location43.36°N 117.11°W
- Elevation3,670 ft (1,119 m)
On October 23, the normal high in Rockville (5 mi N) is 59°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Rockville (5 mi N).
- Jan 39° 22°
- Feb 44° 25°
- Mar 54° 28°
- Apr 62° 32°
- May 71° 39°
- Jun 80° 44°
- Jul 91° 49°
- Aug 89° 48°
- Sep 78° 39°
- Oct 63° 31°
- Nov 48° 25°
- 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 Rockville (5 mi N) each month?
July is the warmest month, with normal highs of 91°F; December the coldest, with normal lows of 21°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 39°F | 22°F | 30.3°F | – | <1 | 28 | 9 h 20 min |
| February | 44°F | 25°F | 34.4°F | – | <1 | 25 | 10 h 30 min |
| March | 54°F | 28°F | 41.4°F | – | <1 | 24 | 11 h 50 min |
| April | 62°F | 32°F | 47.0°F | – | <1 | 18 | 13 h 20 min |
| May | 71°F | 39°F | 54.7°F | – | 1 | 8 | 14 h 40 min |
| June | 80°F | 44°F | 62.2°F | – | 5 | 2 | 15 h 20 min |
| July | 91°F | 49°F | 69.9°F | – | 18 | <1 | 15 h 10 min |
| August | 89°F | 48°F | 68.1°F | – | 16 | 1 | 14 h |
| September | 78°F | 39°F | 58.5°F | – | 2 | 7 | 12 h 30 min |
| October | 63°F | 31°F | 47.0°F | – | <1 | 19 | 11 h 10 min |
| November | 48°F | 25°F | 36.3°F | – | <1 | 24 | 9 h 40 min |
| December | 38°F | 21°F | 29.8°F | – | <1 | 28 | 9 h |
| Year (annual) | 63°F | 34°F | 48.3°F | – | 41 | 185 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 4°C | −6°C | −0.9°C |
| February | 7°C | −4°C | 1.3°C |
| March | 12°C | −2°C | 5.2°C |
| April | 17°C | 0°C | 8.3°C |
| May | 22°C | 4°C | 12.6°C |
| June | 27°C | 7°C | 16.8°C |
| July | 33°C | 10°C | 21.1°C |
| August | 31°C | 9°C | 20.1°C |
| September | 25°C | 4°C | 14.7°C |
| October | 17°C | 0°C | 8.3°C |
| November | 9°C | −4°C | 2.4°C |
| December | 3°C | −6°C | −1.2°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Owyhee Dam (21 miles away), gets 6 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357277; 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 Rockville (5 mi N)?
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 USC00357277.
When is the last frost at Rockville (5 mi N)?
In Rockville (5 mi N), the last spring frost (32°F) comes after May 29 in half of years and after June 23 in one year in ten; the first autumn frost comes before September 14 in half of years and before September 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
- May 291 year in 10 after June 23; 9 in 10 after May 9
- First autumn frost, half of years before
- September 141 year in 10 before September 1; 9 in 10 before October 1
NOAA puts the median frost-free season at 108 days, and the season without a hard freeze (28°F) at 140 days.
A hard freeze (28°F) comes after May 10 in half of springs and before September 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Rockville (5 mi N) in zone 7a in ZIP code 83639, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6b: the coldest night of a typical year reaches −4°F (20 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00357277; 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 at Rockville (5 mi N)?
In a normal year in Rockville (5 mi N), 41 days a year reach 90°F (2 of them 100°F or more) and 185 nights fall to 32°F or colder.
- Days at 90°F or more
- 41a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 185a normal year
- Days that stay below freezing
- 17high of 32°F or less
The highest temperature in this station's record (since 1963) is 106°F, on July 23, 2003; the lowest is −33°F, on December 22, 1990.
The wettest calendar year on that record is 1983, with 20.34 in; the snowiest season is 1992–93, with 45.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00357277; records: ACIS (NOAA Regional Climate Centers), station USC00357277. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Rockville (5 mi N)?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Rockville (5 mi N), 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 Rockville (5 mi N) record?
A normal year at Rockville (5 mi N) brings 6,441 heating degree days, 20% more than the median U.S. place (5,373), and 375 cooling degree days, 59% 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 2,109 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,076 | 0 |
| February | 857 | 0 |
| March | 732 | 0 |
| April | 538 | 0 |
| May | 326 | 7 |
| June | 126 | 43 |
| July | 22 | 174 |
| August | 37 | 132 |
| September | 213 | 18 |
| October | 558 | 0 |
| November | 863 | 0 |
| December | 1,093 | 0 |
| Year (annual) | 6,441 | 375 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357277. 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 Rockville (5 mi N)'s climate compare?
Rockville (5 mi N) is warmer than 22 of the 105 places with their own NOAA record in Oregon. Across the 7,247 U.S. stations with normals, its annual mean of 48.3°F is warmer than 33%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Questions about Rockville (5 mi N)'s climate
What is the coldest month at Rockville (5 mi N)?
December, with a normal high of 38°F and a normal low of 21°F. The warmest is July (91°F by day, 49°F at night).
Does it snow at Rockville (5 mi N)?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Owyhee Dam (21 miles away), records 6 inches of snow in a normal year.
What plant hardiness zone is Rockville (5 mi N) in?
The USDA's 2023 map puts Rockville (5 mi N) in zone 7a in ZIP code 83639, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −4°F (20 years, 1991-2020): zone 6b.
How late can frost come at Rockville (5 mi N)?
In half of years the last 32°F night comes after May 29; in one year in ten it comes after June 23. Waiting until June 23 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Sheaville (1 mi SE), OR17 miles from this station, 48.3°F a year
- Homedale, ID19 miles from this station, 51.8°F a year
- Owyhee Dam, OR21 miles from this station, 51.3°F a year
- Murphy (10 mi W), ID21 miles from this station, 48.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made