Winthrop weather by month
What a typical year looks like in Winthrop, Washington: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Winthrop 1 Wsw, 1 km from Winthrop; records cover 1906–2026.
The year at a glance
- Precipitation a year
- 15.2 in386 mm
- Snow a year
- 59 in151 cm
- Last spring freeze
- May 17
- First fall freeze
- Sep 21
- Heating degree days
- 7,313
- Cooling degree days
- 302
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 97°36° (cooling, 1%).
Month by month
Winthrop in January
Highs average 30°−1° and lows 15°−9°, with 2.1 in52 mm of precipitation and 17 in42 cm of snow in a typical January.
- Record high
- 57°14° (1989)
- Record low
- −32°−36° (1950)
- Heating degree days
- 1313
- Cooling degree days
- 0
Winthrop in February
Highs average 38°4° and lows 18°−8°, with 1.3 in33 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 62°17° (1991)
- Record low
- −28°−33° (1950)
- Heating degree days
- 1030
- Cooling degree days
- 0
Winthrop in March
Highs average 50°10° and lows 25°−4°, with 1.2 in31 mm of precipitation and 3 in9 cm of snow in a typical March.
- Record high
- 79°26° (1930)
- Record low
- −11°−24° (1917)
- Heating degree days
- 846
- Cooling degree days
- 0
Winthrop in April
Highs average 61°16° and lows 32°0°, with 0.84 in21 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 89°32° (1926)
- Record low
- 13°−11° (1936)
- Heating degree days
- 550
- Cooling degree days
- 0
Winthrop in May
Highs average 71°22° and lows 40°4°, with 1.1 in29 mm of precipitation in a typical May.
- Record high
- 100°38° (1986)
- Record low
- 20°−7° (1954)
- Heating degree days
- 302
- Cooling degree days
- 5
Winthrop in June
Highs average 77°25° and lows 46°8°, with 1.1 in28 mm of precipitation in a typical June.
- Record high
- 109°43° (2021)
- Record low
- 28°−2° (1952)
- Heating degree days
- 141
- Cooling degree days
- 30
Winthrop in July
Highs average 86°30° and lows 51°10°, with 0.69 in18 mm of precipitation in a typical July.
- Record high
- 106°41° (1930)
- Record low
- 31°−1° (1981)
- Heating degree days
- 31
- Cooling degree days
- 133
Winthrop in August
Highs average 86°30° and lows 49°10°, with 0.45 in11 mm of precipitation in a typical August.
- Record high
- 105°41° (1961)
- Record low
- 28°−2° (1910)
- Heating degree days
- 38
- Cooling degree days
- 114
Winthrop in September
Highs average 77°25° and lows 41°5°, with 0.45 in11 mm of precipitation in a typical September.
- Record high
- 102°39° (2025)
- Record low
- 18°−8° (1983)
- Heating degree days
- 197
- Cooling degree days
- 20
Winthrop in OctoberThis month
Highs average 61°16° and lows 32°0°, with 1.4 in35 mm of precipitation and 1.1 in2.8 cm of snow in a typical October.
- Record high
- 88°31° (1910)
- Record low
- 5°−15° (1935)
- Heating degree days
- 577
- Cooling degree days
- 0
Winthrop in November
Highs average 41°5° and lows 25°−4°, with 2 in52 mm of precipitation and 8 in19 cm of snow in a typical November.
- Record high
- 68°20° (1989)
- Record low
- −17°−27° (1958)
- Heating degree days
- 964
- Cooling degree days
- 0
Winthrop in December
Highs average 29°−2° and lows 15°−9°, with 2.6 in65 mm of precipitation and 22 in55 cm of snow in a typical December.
- Record high
- 70°21° (2021)
- Record low
- −48°−44° (1968)
- Heating degree days
- 1324
- Cooling degree days
- 0