Monument, Oregon climate: Normal weather by month, frost dates and records
Monument's normal year runs from 23°F December nights to 93°F July afternoons, with 15.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.8°C, December lows of −5°C, July highs of 34°C, 384 mm of precipitation a year.
- NOAA stationMonument 2
- Station IDUSC00355711
- Location44.82°N 119.42°W
- Elevation1,995 ft (608 m)
- Population111
On October 23, the normal high in Monument is 63°F and the normal low 32°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Monument.
- Jan 44° 23°
- Feb 50° 25°
- Mar 58° 30°
- Apr 65° 35°
- May 74° 41°
- Jun 81° 47°
- Jul 93° 51°
- Aug 94° 50°
- Sep 84° 42°
- Oct 67° 34°
- Nov 53° 28°
- Dec 43° 23°
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 Monument each month?
July is the warmest month, with normal highs of 93°F; December the coldest, with normal lows of 23°F. The most precipitation falls in May (2.10 in), the least in July (0.48 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 44°F | 23°F | 33.6°F | 1.31 | – | <1 | 28 | 9 h 10 min |
| February | 50°F | 25°F | 37.5°F | 1.21 | – | <1 | 24 | 10 h 20 min |
| March | 58°F | 30°F | 44.1°F | 1.56 | – | <1 | 22 | 11 h 50 min |
| April | 65°F | 35°F | 50.0°F | 1.51 | – | <1 | 13 | 13 h 30 min |
| May | 74°F | 41°F | 57.8°F | 2.10 | – | 4 | 4 | 14 h 50 min |
| June | 81°F | 47°F | 64.3°F | 1.48 | – | 8 | <1 | 15 h 30 min |
| July | 93°F | 51°F | 72.3°F | 0.48 | – | 24 | <1 | 15 h 20 min |
| August | 94°F | 50°F | 71.8°F | 0.58 | – | 23 | <1 | 14 h 10 min |
| September | 84°F | 42°F | 62.7°F | 0.58 | – | 12 | 3 | 12 h 40 min |
| October | 67°F | 34°F | 50.6°F | 1.27 | – | 1 | 15 | 11 h |
| November | 53°F | 28°F | 40.1°F | 1.47 | – | <1 | 21 | 9 h 40 min |
| December | 43°F | 23°F | 33.2°F | 1.58 | – | <1 | 27 | 8 h 50 min |
| Year (annual) | 67°F | 36°F | 51.5°F | 15.13 | – | 71 | 158 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 7°C | −5°C | 0.9°C | 33 mm |
| February | 10°C | −4°C | 3.1°C | 31 mm |
| March | 15°C | −1°C | 6.7°C | 40 mm |
| April | 19°C | 1°C | 10.0°C | 38 mm |
| May | 23°C | 5°C | 14.3°C | 53 mm |
| June | 27°C | 8°C | 17.9°C | 38 mm |
| July | 34°C | 11°C | 22.4°C | 12 mm |
| August | 34°C | 10°C | 22.1°C | 15 mm |
| September | 29°C | 5°C | 17.1°C | 15 mm |
| October | 20°C | 1°C | 10.3°C | 32 mm |
| November | 11°C | −2°C | 4.5°C | 37 mm |
| December | 6°C | −5°C | 0.7°C | 40 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Long Creek (17 miles away), gets 33 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00355711; 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 Monument?
Normal highs sit between 65°F and 85°F in April, May, June, September and October.
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 USC00355711.
When is the last frost in Monument?
In Monument, the last spring frost (32°F) comes after May 9 in half of years and after May 26 in one year in ten; the first autumn frost comes before September 27 in half of years and before September 9 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 91 year in 10 after May 26; 9 in 10 after April 25
- First autumn frost, half of years before
- September 271 year in 10 before September 9; 9 in 10 before October 10
NOAA puts the median frost-free season at 139 days, and the season without a hard freeze (28°F) at 168 days.
A hard freeze (28°F) comes after April 23 in half of springs and before October 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Monument in zone 7a in ZIP code 97864, 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 USC00355711; 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 Monument?
In a normal year in Monument, 71 days a year reach 90°F (22 of them 100°F or more) and 158 nights fall to 32°F or colder.
- Days at 90°F or more
- 71a normal year
- Days at 100°F or more
- 22a normal year
- Nights at 32°F or colder
- 158a normal year
- Days that stay below freezing
- 6high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00355711.
How sunny is Monument?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Monument, 4.3 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (59%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.6 |
| February | 67% | 2.5 |
| March | 68% | 3.7 |
| April | 72% | 5.1 |
| May | 74% | 6.1 |
| June | 81% | 7.1 |
| July | 92% | 7.8 |
| August | 90% | 6.6 |
| September | 86% | 5.0 |
| October | 76% | 3.2 |
| November | 66% | 1.8 |
| December | 59% | 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 much heating and cooling does Monument need?
A normal year in Monument brings 5,515 heating degree days, 3% more than the median U.S. place (5,373), and 612 cooling degree days, 33% 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 2,635 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 975 | 0 |
| February | 770 | 0 |
| March | 648 | 0 |
| April | 452 | 1 |
| May | 247 | 22 |
| June | 95 | 73 |
| July | 12 | 238 |
| August | 13 | 224 |
| September | 123 | 54 |
| October | 447 | 1 |
| November | 747 | 0 |
| December | 986 | 0 |
| Year (annual) | 5,515 | 612 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00355711. 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 Monument's climate compare?
Monument is warmer than 47 of the other 104 places with their own NOAA record in Oregon, and wetter than 30. Across the 7,247 U.S. stations with normals, its annual mean of 51.5°F is warmer than 47%.
In the Köppen classification computed from these normals, Monument is Csa: temperate, dry-summer, hot summer. 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.
Which places near Monument share this climate record?
Spray has no NOAA station with 1991-2020 normals of its 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.
- Spray, OR141 people · 18 mi W
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 Monument's climate
What is the coldest month in Monument?
December, with a normal high of 43°F and a normal low of 23°F. The warmest is July (93°F by day, 51°F at night).
Does it snow in Monument?
Yes. NOAA publishes no 1991-2020 snowfall normal for Monument's NOAA station; the nearest record that keeps one, Long Creek (17 miles away), records 33 inches of snow in a normal year.
What is the rainiest month in Monument?
May, with 2.10 in of precipitation in a normal year; the driest is July with 0.48 in.
What plant hardiness zone is Monument in?
The USDA's 2023 map puts Monument in zone 7a in ZIP code 97864, the nearest ZIP area.
How late can frost come in Monument?
In half of years the last 32°F night comes after May 9; in one year in ten it comes after May 26. Waiting until May 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Long Creek, OR17 miles from this station, 46.6°F a year
- Dayville, OR21 miles from this station, 53.2°F a year
- John Day, OR35 miles from this station, 46.8°F a year
- Mitchell, OR39 miles from this station, 48.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made