Dayville weather by month
What a typical year looks like in Dayville, Oregon: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at John Day 35 Wnw, 13 km from Dayville; records cover 2004–2026.
The year at a glance
- Precipitation a year
- 9.8 in248 mm
- Snow a year
- Rare
- Last spring freeze
- May 2
- First fall freeze
- Oct 12
- Heating degree days
- 5,149
- Cooling degree days
- 689
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 10°−12° (heating, 99%) and 102°39° (cooling, 1%).
Month by month
Dayville in January
Highs average 45°7° and lows 29°−2°, with 1 in26 mm of precipitation in a typical January.
- Record high
- 68°20° (2024)
- Record low
- −5°−21° (2017)
- Heating degree days
- 880
- Cooling degree days
- 0
Dayville in February
Highs average 50°10° and lows 29°−2°, with 0.64 in16 mm of precipitation in a typical February.
- Record high
- 70°21° (2018)
- Record low
- −3°−19° (2014)
- Heating degree days
- 718
- Cooling degree days
- 0
Dayville in March
Highs average 56°13° and lows 34°1°, with 0.88 in22 mm of precipitation in a typical March.
- Record high
- 85°29° (2026)
- Record low
- 13°−11° (2022)
- Heating degree days
- 625
- Cooling degree days
- 0
Dayville in April
Highs average 62°16° and lows 37°3°, with 1.1 in27 mm of precipitation in a typical April.
- Record high
- 90°32° (2012)
- Record low
- 19°−7° (2008)
- Heating degree days
- 468
- Cooling degree days
- 1
Dayville in May
Highs average 71°22° and lows 44°7°, with 1.4 in35 mm of precipitation in a typical May.
- Record high
- 98°37° (2008)
- Record low
- 28°−2° (2011)
- Heating degree days
- 249
- Cooling degree days
- 22
Dayville in June
Highs average 80°26° and lows 50°10°, with 0.91 in23 mm of precipitation in a typical June.
- Record high
- 111°44° (2021)
- Record low
- 36°2° (2005)
- Heating degree days
- 89
- Cooling degree days
- 77
Dayville in July
Highs average 91°33° and lows 55°13°, with 0.45 in11 mm of precipitation in a typical July.
- Record high
- 109°43° (2022)
- Record low
- 43°6° (2010)
- Heating degree days
- 7
- Cooling degree days
- 266
Dayville in August
Highs average 90°32° and lows 54°12°, with 0.39 in9.9 mm of precipitation in a typical August.
- Record high
- 110°43° (2018)
- Record low
- 39°4° (2010)
- Heating degree days
- 11
- Cooling degree days
- 233
Dayville in September
Highs average 81°27° and lows 48°9°, with 0.29 in7.4 mm of precipitation in a typical September.
- Record high
- 109°43° (2020)
- Record low
- 32°0° (2018)
- Heating degree days
- 106
- Cooling degree days
- 84
Dayville in OctoberThis month
Highs average 66°19° and lows 40°4°, with 0.75 in19 mm of precipitation in a typical October.
- Record high
- 91°33° (2008)
- Record low
- 13°−11° (2019)
- Heating degree days
- 392
- Cooling degree days
- 6
Dayville in November
Highs average 51°11° and lows 32°0°, with 1 in26 mm of precipitation in a typical November.
- Record high
- 79°26° (2025)
- Record low
- −1°−18° (2014)
- Heating degree days
- 696
- Cooling degree days
- 0
Dayville in December
Highs average 43°6° and lows 28°−2°, with 0.98 in25 mm of precipitation in a typical December.
- Record high
- 67°19° (2025)
- Record low
- −9°−23° (2013)
- Heating degree days
- 908
- Cooling degree days
- 0