Jasper weather by month
What a typical year looks like in Jasper, Oregon: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at COTTAGE GROVE 2E, 24 km from Jasper; records cover 1916–2026.
The year at a glance
- Precipitation a year
- 46.5 in1180 mm
- Snow a year
- 2.7 in6.9 cm
- Last spring freeze
- Apr 20
- First fall freeze
- Oct 27
- Heating degree days
- 4,853
- Cooling degree days
- 224
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 22°−6° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Jasper in January
Highs average 48°9° and lows 33°1°, with 6.6 in167 mm of precipitation and 0.9 in2.3 cm of snow in a typical January.
- Record high
- 71°22° (2018)
- Record low
- −2°−19° (1957)
- Heating degree days
- 752
- Cooling degree days
- 0
Jasper in February
Highs average 52°11° and lows 34°1°, with 4.9 in123 mm of precipitation and 1.1 in2.8 cm of snow in a typical February.
- Record high
- 76°24° (1932)
- Record low
- 0°−18° (1950)
- Heating degree days
- 623
- Cooling degree days
- 0
Jasper in March
Highs average 56°13° and lows 35°2°, with 5.2 in133 mm of precipitation and 0.3 in0.8 cm of snow in a typical March.
- Record high
- 83°28° (1926)
- Record low
- 14°−10° (1956)
- Heating degree days
- 595
- Cooling degree days
- 0
Jasper in April
Highs average 61°16° and lows 38°3°, with 4.5 in113 mm of precipitation in a typical April.
- Record high
- 87°31° (1926)
- Record low
- 21°−6° (1968)
- Heating degree days
- 459
- Cooling degree days
- 0
Jasper in May
Highs average 68°20° and lows 44°6°, with 3.1 in79 mm of precipitation in a typical May.
- Record high
- 98°37° (2008)
- Record low
- 23°−5° (1954)
- Heating degree days
- 295
- Cooling degree days
- 5
Jasper in June
Highs average 73°23° and lows 48°9°, with 1.7 in42 mm of precipitation in a typical June.
- Record high
- 105°41° (2021)
- Record low
- 29°−2° (1976)
- Heating degree days
- 157
- Cooling degree days
- 22
Jasper in July
Highs average 82°28° and lows 51°11°, with 0.4 in10 mm of precipitation in a typical July.
- Record high
- 105°41° (1926)
- Record low
- 34°1° (1918)
- Heating degree days
- 40
- Cooling degree days
- 88
Jasper in August
Highs average 83°28° and lows 50°10°, with 0.53 in13 mm of precipitation in a typical August.
- Record high
- 105°41° (1978)
- Record low
- 32°0° (1988)
- Heating degree days
- 38
- Cooling degree days
- 85
Jasper in September
Highs average 77°25° and lows 46°8°, with 1.5 in39 mm of precipitation in a typical September.
- Record high
- 105°41° (1944)
- Record low
- 24°−4° (1926)
- Heating degree days
- 135
- Cooling degree days
- 24
Jasper in OctoberThis month
Highs average 64°18° and lows 41°5°, with 3.8 in95 mm of precipitation in a typical October.
- Record high
- 96°36° (1980)
- Record low
- 17°−8° (2002)
- Heating degree days
- 386
- Cooling degree days
- 0
Jasper in November
Highs average 53°12° and lows 37°3°, with 6.8 in172 mm of precipitation in a typical November.
- Record high
- 77°25° (2016)
- Record low
- 9°−13° (1985)
- Heating degree days
- 598
- Cooling degree days
- 0
Jasper in December
Highs average 47°8° and lows 33°1°, with 7.6 in192 mm of precipitation and 0.4 in1 cm of snow in a typical December.
- Record high
- 73°23° (1926)
- Record low
- −4°−20° (1919)
- Heating degree days
- 775
- Cooling degree days
- 0