Dilley weather by month
What a typical year looks like in Dilley, Oregon: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at FOREST GROVE, 4 km from Dilley; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 46.7 in1187 mm
- Snow a year
- 2.7 in6.9 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 28
- Heating degree days
- 5,027
- Cooling degree days
- 348
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 20°−7° (heating, 99%) and 98°37° (cooling, 1%).
Month by month
Dilley in January
Highs average 45°7° and lows 33°0°, with 7.2 in183 mm of precipitation and 0.6 in1.5 cm of snow in a typical January.
- Record high
- 67°19° (2005)
- Record low
- −11°−24° (1909)
- Heating degree days
- 812
- Cooling degree days
- 0
Dilley in February
Highs average 49°10° and lows 33°1°, with 5.8 in146 mm of precipitation and 0.6 in1.5 cm of snow in a typical February.
- Record high
- 77°25° (1905)
- Record low
- −12°−24° (1950)
- Heating degree days
- 665
- Cooling degree days
- 0
Dilley in March
Highs average 55°13° and lows 36°2°, with 5 in128 mm of precipitation in a typical March.
- Record high
- 82°28° (1930)
- Record low
- 13°−11° (1971)
- Heating degree days
- 612
- Cooling degree days
- 0
Dilley in April
Highs average 60°16° and lows 39°4°, with 3.3 in85 mm of precipitation in a typical April.
- Record high
- 93°34° (1897)
- Record low
- 23°−5° (1903)
- Heating degree days
- 461
- Cooling degree days
- 1
Dilley in May
Highs average 68°20° and lows 45°7°, with 2.2 in56 mm of precipitation in a typical May.
- Record high
- 101°38° (1983)
- Record low
- 28°−2° (1894)
- Heating degree days
- 273
- Cooling degree days
- 16
Dilley in June
Highs average 73°23° and lows 50°10°, with 1.4 in36 mm of precipitation in a typical June.
- Record high
- 113°45° (2021)
- Record low
- 32°0° (1999)
- Heating degree days
- 147
- Cooling degree days
- 39
Dilley in July
Highs average 81°27° and lows 54°12°, with 0.32 in8.1 mm of precipitation in a typical July.
- Record high
- 109°43° (1956)
- Record low
- 34°1° (1955)
- Heating degree days
- 42
- Cooling degree days
- 122
Dilley in August
Highs average 82°28° and lows 54°12°, with 0.51 in13 mm of precipitation in a typical August.
- Record high
- 108°42° (1977)
- Record low
- 33°1° (1909)
- Heating degree days
- 35
- Cooling degree days
- 123
Dilley in September
Highs average 76°24° and lows 49°9°, with 1.3 in34 mm of precipitation in a typical September.
- Record high
- 104°40° (1988)
- Record low
- 27°−3° (1908)
- Heating degree days
- 123
- Cooling degree days
- 45
Dilley in OctoberThis month
Highs average 63°17° and lows 42°5°, with 3.7 in94 mm of precipitation and 0.2 in0.5 cm of snow in a typical October.
- Record high
- 93°34° (1988)
- Record low
- 20°−7° (2002)
- Heating degree days
- 391
- Cooling degree days
- 2
Dilley in November
Highs average 51°11° and lows 36°2°, with 7.2 in184 mm of precipitation in a typical November.
- Record high
- 72°22° (1975)
- Record low
- 6°−14° (1985)
- Heating degree days
- 642
- Cooling degree days
- 0
Dilley in December
Highs average 44°7° and lows 33°0°, with 8.7 in221 mm of precipitation and 1.3 in3.3 cm of snow in a typical December.
- Record high
- 64°18° (1980)
- Record low
- −4°−20° (1972)
- Heating degree days
- 824
- Cooling degree days
- 0