Oregon weather by month
What a typical year looks like in Oregon, Illinois: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at DIXON WWTP, 25 km from Oregon; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 40.5 in1029 mm
- Snow a year
- 31 in79 cm
- Last spring freeze
- Apr 24
- First fall freeze
- Oct 14
- Heating degree days
- 6,487
- Cooling degree days
- 852
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Oregon in January
Highs average 29°−2° and lows 14°−10°, with 2 in50 mm of precipitation and 13 in33 cm of snow in a typical January.
- Record high
- 65°18° (2004)
- Record low
- −32°−36° (2009)
- Heating degree days
- 1354
- Cooling degree days
- 0
Oregon in February
Highs average 34°1° and lows 17°−8°, with 1.8 in46 mm of precipitation and 6 in14 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −27°−33° (1905)
- Heating degree days
- 1107
- Cooling degree days
- 0
Oregon in March
Highs average 46°8° and lows 28°−2°, with 2.6 in67 mm of precipitation and 5 in11 cm of snow in a typical March.
- Record high
- 87°31° (1986)
- Record low
- −13°−25° (2002)
- Heating degree days
- 860
- Cooling degree days
- 1
Oregon in April
Highs average 60°16° and lows 39°4°, with 4 in101 mm of precipitation and 0.6 in1.5 cm of snow in a typical April.
- Record high
- 93°34° (1986)
- Record low
- 8°−13° (1982)
- Heating degree days
- 476
- Cooling degree days
- 7
Oregon in May
Highs average 71°22° and lows 51°10°, with 4.8 in122 mm of precipitation in a typical May.
- Record high
- 105°41° (1934)
- Record low
- 24°−4° (2005)
- Heating degree days
- 189
- Cooling degree days
- 60
Oregon in June
Highs average 80°27° and lows 61°16°, with 5.6 in142 mm of precipitation in a typical June.
- Record high
- 106°41° (1934)
- Record low
- 34°1° (1894)
- Heating degree days
- 30
- Cooling degree days
- 188
Oregon in July
Highs average 83°28° and lows 64°18°, with 4.3 in109 mm of precipitation in a typical July.
- Record high
- 110°43° (1936)
- Record low
- 43°6° (1904)
- Heating degree days
- 4
- Cooling degree days
- 267
Oregon in August
Highs average 81°27° and lows 62°17°, with 4.2 in106 mm of precipitation in a typical August.
- Record high
- 103°39° (1930)
- Record low
- 37°3° (1934)
- Heating degree days
- 9
- Cooling degree days
- 223
Oregon in September
Highs average 75°24° and lows 54°12°, with 3.7 in94 mm of precipitation in a typical September.
- Record high
- 102°39° (1939)
- Record low
- 22°−6° (1942)
- Heating degree days
- 106
- Cooling degree days
- 93
Oregon in OctoberThis month
Highs average 63°17° and lows 42°6°, with 3 in75 mm of precipitation in a typical October.
- Record high
- 95°35° (1897)
- Record low
- 7°−14° (1925)
- Heating degree days
- 404
- Cooling degree days
- 13
Oregon in November
Highs average 48°9° and lows 31°−1°, with 2.4 in62 mm of precipitation and 1.8 in4.6 cm of snow in a typical November.
- Record high
- 81°27° (1933)
- Record low
- −8°−22° (1950)
- Heating degree days
- 779
- Cooling degree days
- 0
Oregon in December
Highs average 35°1° and lows 20°−7°, with 2.2 in55 mm of precipitation and 6 in14 cm of snow in a typical December.
- Record high
- 68°20° (1970)
- Record low
- −25°−32° (1924)
- Heating degree days
- 1169
- Cooling degree days
- 0