Dayville, Oregon climate: Normal weather by month, frost dates and records
Dayville's normal year runs from 27°F December nights to 93°F July afternoons, with 13.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.8°C, December lows of −3°C, July highs of 34°C, 334 mm of precipitation a year.
- NOAA stationDayville (8 mi NW)
- Station IDUSC00352173
- Location44.56°N 119.64°W
- Elevation2,260 ft (689 m)
- Population130
On October 23, the normal high in Dayville is 64°F and the normal low 37°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Dayville.
- Jan 45° 29°
- Feb 50° 29°
- Mar 58° 33°
- Apr 63° 37°
- May 73° 44°
- Jun 81° 49°
- Jul 93° 55°
- Aug 92° 53°
- Sep 82° 47°
- Oct 68° 39°
- Nov 54° 33°
- Dec 46° 27°
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 Dayville each month?
July is the warmest month, with normal highs of 93°F; December the coldest, with normal lows of 27°F. The most precipitation falls in May (1.95 in), the least in July (0.53 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 45°F | 29°F | 37.1°F | 1.12 | – | <1 | 24 | 9 h 10 min |
| February | 50°F | 29°F | 39.7°F | 0.85 | – | <1 | 21 | 10 h 30 min |
| March | 58°F | 33°F | 45.5°F | 1.27 | – | <1 | 17 | 11 h 50 min |
| April | 63°F | 37°F | 50.0°F | 1.38 | – | <1 | 10 | 13 h 30 min |
| May | 73°F | 44°F | 58.1°F | 1.95 | – | 3 | 3 | 14 h 50 min |
| June | 81°F | 49°F | 65.1°F | 1.38 | – | 7 | <1 | 15 h 30 min |
| July | 93°F | 55°F | 73.6°F | 0.53 | – | 22 | <1 | 15 h 20 min |
| August | 92°F | 53°F | 72.6°F | 0.54 | – | 21 | <1 | 14 h 10 min |
| September | 82°F | 47°F | 64.7°F | 0.56 | – | 9 | 1 | 12 h 40 min |
| October | 68°F | 39°F | 53.1°F | 1.09 | – | 1 | 8 | 11 h |
| November | 54°F | 33°F | 43.0°F | 1.32 | – | <1 | 17 | 9 h 40 min |
| December | 46°F | 27°F | 36.5°F | 1.14 | – | <1 | 24 | 8 h 50 min |
| Year (annual) | 67°F | 40°F | 53.2°F | 13.13 | – | 62 | 123 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 7°C | −2°C | 2.8°C | 28 mm |
| February | 10°C | −2°C | 4.3°C | 22 mm |
| March | 14°C | 1°C | 7.5°C | 32 mm |
| April | 17°C | 3°C | 10.0°C | 35 mm |
| May | 23°C | 6°C | 14.5°C | 50 mm |
| June | 27°C | 10°C | 18.4°C | 35 mm |
| July | 34°C | 13°C | 23.1°C | 13 mm |
| August | 33°C | 12°C | 22.6°C | 14 mm |
| September | 28°C | 8°C | 18.2°C | 14 mm |
| October | 20°C | 4°C | 11.7°C | 28 mm |
| November | 12°C | 0°C | 6.1°C | 34 mm |
| December | 8°C | −3°C | 2.5°C | 29 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 USC00352173; 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 Dayville?
Normal highs sit between 65°F and 85°F in 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 USC00352173.
When is the last frost in Dayville?
In Dayville, the last spring frost (32°F) comes after May 4 in half of years and after May 23 in one year in ten; the first autumn frost comes before October 6 in half of years and before September 21 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 41 year in 10 after May 23; 9 in 10 after April 18
- First autumn frost, half of years before
- October 61 year in 10 before September 21; 9 in 10 before October 23
NOAA puts the median frost-free season at 155 days, and the season without a hard freeze (28°F) at 186 days.
A hard freeze (28°F) comes after April 18 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dayville in zone 7a in ZIP code 97825, 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 USC00352173; 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 Dayville?
In a normal year in Dayville, 62 days a year reach 90°F (15 of them 100°F or more) and 123 nights fall to 32°F or colder.
- Days at 90°F or more
- 62a normal year
- Days at 100°F or more
- 15a normal year
- Nights at 32°F or colder
- 123a normal year
- Days that stay below freezing
- 5high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00352173.
How sunny is Dayville?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Dayville, 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 Dayville need?
A normal year in Dayville brings 5,005 heating degree days, 7% fewer than the median U.S. place (5,373), and 745 cooling degree days, 18% 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 2,905 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 866 | 0 |
| February | 708 | 0 |
| March | 606 | 0 |
| April | 451 | 2 |
| May | 241 | 28 |
| June | 85 | 88 |
| July | 11 | 277 |
| August | 15 | 250 |
| September | 102 | 93 |
| October | 375 | 6 |
| November | 660 | 0 |
| December | 885 | 0 |
| Year (annual) | 5,005 | 745 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00352173. 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 Dayville's climate compare?
Dayville is warmer than 74 of the other 104 places with their own NOAA record in Oregon, and wetter than 18. Across the 7,247 U.S. stations with normals, its annual mean of 53.2°F is warmer than 54%.
In the Köppen classification computed from these normals, Dayville 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.
What do Dayville's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Dayville. This page uses Dayville (8 mi NW); the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| John Day (35 mi WNW) USW00004125 | in town | 2,245 ft | 52.7°F | 29°F | 91°F | 9.8 | – | April 30 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Dayville's climate
What is the coldest month in Dayville?
December, with a normal high of 46°F and a normal low of 27°F. The warmest is July (93°F by day, 55°F at night).
What is the rainiest month in Dayville?
May, with 1.95 in of precipitation in a normal year; the driest is July with 0.53 in.
What plant hardiness zone is Dayville in?
The USDA's 2023 map puts Dayville in zone 7a in ZIP code 97825, the nearest ZIP area.
How late can frost come in Dayville?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 23. Waiting until May 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
- Monument, OR21 miles from this station, 51.5°F a year
- Mitchell, OR23 miles from this station, 48.6°F a year
- Long Creek, OR29 miles from this station, 46.6°F a year
- Paulina, OR34 miles from this station, 46.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made