Rome St Airport, Oregon climate: Climate normals at a NOAA weather station
Rome St Airport's normal year runs from 19°F December nights to 94°F July afternoons, with 8.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.9°C, December lows of −7°C, July highs of 34°C, 208 mm of precipitation a year.
- NOAA stationRome St Airport
- Station IDUSW00094107
- Location42.59°N 117.86°W
- Elevation4,050 ft (1,234 m)
On October 23, the normal high in Rome St Airport is 63°F and the normal low 30°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Rome St Airport.
- Jan 41° 20°
- Feb 48° 23°
- Mar 56° 28°
- Apr 62° 31°
- May 72° 39°
- Jun 82° 46°
- Jul 94° 53°
- Aug 92° 51°
- Sep 82° 42°
- Oct 67° 32°
- Nov 51° 24°
- Dec 40° 19°
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 Rome St Airport each month?
July is the warmest month, with normal highs of 94°F; December the coldest, with normal lows of 19°F. The most precipitation falls in May (1.24 in), the least in August (0.20 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 41°F | 20°F | 30.8°F | 0.84 | 9 | <1 | 28 | 9 h 20 min |
| February | 48°F | 23°F | 35.2°F | 0.55 | 7 | <1 | 24 | 10 h 30 min |
| March | 56°F | 28°F | 41.9°F | 0.71 | 8 | <1 | 23 | 11 h 50 min |
| April | 62°F | 31°F | 46.8°F | 0.92 | 9 | <1 | 18 | 13 h 20 min |
| May | 72°F | 39°F | 55.6°F | 1.24 | 9 | 1 | 7 | 14 h 30 min |
| June | 82°F | 46°F | 64.2°F | 0.98 | 5 | 8 | 1 | 15 h 20 min |
| July | 94°F | 53°F | 73.5°F | 0.31 | 3 | 24 | <1 | 15 h |
| August | 92°F | 51°F | 71.7°F | 0.20 | 2 | 21 | <1 | 14 h |
| September | 82°F | 42°F | 62.1°F | 0.39 | 4 | 6 | 3 | 12 h 30 min |
| October | 67°F | 32°F | 49.5°F | 0.66 | 5 | <1 | 16 | 11 h 10 min |
| November | 51°F | 24°F | 37.4°F | 0.54 | 7 | <1 | 25 | 9 h 50 min |
| December | 40°F | 19°F | 29.6°F | 0.85 | 9 | <1 | 28 | 9 h |
| Year (annual) | 66°F | 34°F | 49.9°F | 8.19 | 76 | 60 | 172 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 5°C | −6°C | −0.7°C | 21 mm |
| February | 9°C | −5°C | 1.8°C | 14 mm |
| March | 13°C | −2°C | 5.5°C | 18 mm |
| April | 17°C | 0°C | 8.2°C | 23 mm |
| May | 22°C | 4°C | 13.1°C | 31 mm |
| June | 28°C | 8°C | 17.9°C | 25 mm |
| July | 34°C | 12°C | 23.1°C | 8 mm |
| August | 33°C | 11°C | 22.1°C | 5 mm |
| September | 28°C | 6°C | 16.7°C | 10 mm |
| October | 19°C | 0°C | 9.7°C | 17 mm |
| November | 11°C | −5°C | 3.0°C | 14 mm |
| December | 5°C | −7°C | −1.3°C | 22 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 USW00094107; 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 Rome St Airport?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (4).
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 USW00094107.
When is the last frost at Rome St Airport?
In Rome St Airport, the last spring frost (32°F) comes after May 26 in half of years and after June 13 in one year in ten; the first autumn frost comes before September 21 in half of years and before September 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
- May 261 year in 10 after June 13; 9 in 10 after May 8
- First autumn frost, half of years before
- September 211 year in 10 before September 5; 9 in 10 before October 5
NOAA puts the median frost-free season at 117 days, and the season without a hard freeze (28°F) at 145 days.
A hard freeze (28°F) comes after May 9 in half of springs and before October 3 in half of autumns.
By the USDA's method, the average of each year's coldest night over 1991-2020, the station is in plant hardiness zone 6a: the coldest night of a typical year reaches −6°F (18 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 USW00094107; 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 Rome St Airport?
In a normal year in Rome St Airport, 60 days a year reach 90°F (9 of them 100°F or more), 172 nights fall to 32°F or colder and 76 days bring measurable precipitation.
- Days at 90°F or more
- 60a normal year
- Days at 100°F or more
- 9a normal year
- Nights at 32°F or colder
- 172a normal year
- Days that stay below freezing
- 17high of 32°F or less
- Days with 0.01 inch of precipitation
- 76a normal year
The highest temperature in this station's record (since 1949) is 109°F, on July 12, 2002; the lowest is −23°F, on January 6, 2017.
The wettest calendar year on that record is 2019, with 10.45 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00094107; records: ACIS (NOAA Regional Climate Centers), station USW00094107. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Rome St Airport?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Rome St Airport, 4.6 kWh per square metre a day. July is the sunniest month (91%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.8 |
| February | 68% | 2.8 |
| March | 70% | 4.0 |
| April | 75% | 5.5 |
| May | 78% | 6.6 |
| June | 85% | 7.5 |
| July | 91% | 7.7 |
| August | 90% | 6.7 |
| September | 88% | 5.3 |
| October | 83% | 3.7 |
| November | 73% | 2.2 |
| December | 60% | 1.5 |
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 Rome St Airport record?
A normal year at Rome St Airport brings 6,152 heating degree days, 14% more than the median U.S. place (5,373), and 658 cooling degree days, 28% 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 2,584 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,059 | 0 |
| February | 834 | 0 |
| March | 715 | 0 |
| April | 546 | 0 |
| May | 307 | 17 |
| June | 109 | 85 |
| July | 9 | 271 |
| August | 16 | 224 |
| September | 147 | 59 |
| October | 485 | 3 |
| November | 828 | 0 |
| December | 1,097 | 0 |
| Year (annual) | 6,152 | 658 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00094107. 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.
Have recent years at Rome St Airport been warmer than normal?
2025 averaged 51.0°F, 1.1°F above the 1991-2020 normal of 49.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.3°F | +2.4°F | 9.11 |
| 2022 | 50.0°F | +0.1°F | 6.92 |
| 2023 | 49.5°F | −0.4°F | 10.40 |
| 2024 | 50.9°F | +1.0°F | 9.74 |
| 2025 | 51.0°F | +1.1°F | 9.32 |
Source: observed years: ACIS, station USW00094107. A year counts only with all twelve months complete.
How does Rome St Airport's climate compare?
Rome St Airport is warmer than 34 of the 105 places with their own NOAA record in Oregon, and wetter than 0. Across the 7,247 U.S. stations with normals, its annual mean of 49.9°F is warmer than 40%.
In the Köppen classification computed from these normals, Rome St Airport 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 Rome St Airport's climate
What is the coldest month at Rome St Airport?
December, with a normal high of 40°F and a normal low of 19°F. The warmest is July (94°F by day, 53°F at night).
What is the rainiest month at Rome St Airport?
May, with 1.24 in of precipitation in a normal year; the driest is August with 0.20 in.
What plant hardiness zone is Rome St Airport in?
By the same method at the station, the coldest night of a typical year reaches −6°F (18 years, 1991-2020): zone 6a.
How late can frost come at Rome St Airport?
In half of years the last 32°F night comes after May 26; in one year in ten it comes after June 13. Waiting until June 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- McDermitt (26 mi N), OR12 miles from this station, 50.3°F a year
- Rome (2 mi NW), OR21 miles from this station, 48.8°F a year
- McDermitt, NV42 miles from this station, 47.6°F a year
- Fields, OR47 miles from this station, 50.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made