Treynor weather by month
What a typical year looks like in Treynor, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Oakland, 20 km from Treynor; records cover 1919–2026.
The year at a glance
- Precipitation a year
- 36.4 in925 mm
- Snow a year
- 28 in71 cm
- Last spring freeze
- Apr 23
- First fall freeze
- Oct 13
- Heating degree days
- 6,555
- Cooling degree days
- 914
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 94°34° (cooling, 1%).
Month by month
Treynor in January
Highs average 30°−1° and lows 12°−11°, with 0.85 in22 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 69°21° (1944)
- Record low
- −31°−35° (1974)
- Heating degree days
- 1366
- Cooling degree days
- 0
Treynor in February
Highs average 35°2° and lows 16°−9°, with 1.1 in27 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 78°26° (2024)
- Record low
- −29°−34° (1996)
- Heating degree days
- 1112
- Cooling degree days
- 0
Treynor in March
Highs average 49°9° and lows 27°−3°, with 2 in51 mm of precipitation and 3 in9 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −25°−32° (1948)
- Heating degree days
- 846
- Cooling degree days
- 1
Treynor in April
Highs average 62°16° and lows 37°3°, with 3.9 in99 mm of precipitation and 1.1 in2.8 cm of snow in a typical April.
- Record high
- 93°34° (1930)
- Record low
- 0°−18° (1975)
- Heating degree days
- 476
- Cooling degree days
- 7
Treynor in May
Highs average 72°22° and lows 50°10°, with 5.4 in138 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 104°40° (1934)
- Record low
- 21°−6° (1961)
- Heating degree days
- 185
- Cooling degree days
- 58
Treynor in June
Highs average 82°28° and lows 61°16°, with 5.3 in134 mm of precipitation in a typical June.
- Record high
- 108°42° (1937)
- Record low
- 33°1° (1951)
- Heating degree days
- 22
- Cooling degree days
- 202
Treynor in July
Highs average 85°29° and lows 64°18°, with 3.6 in91 mm of precipitation in a typical July.
- Record high
- 116°47° (1936)
- Record low
- 36°2° (1971)
- Heating degree days
- 4
- Cooling degree days
- 294
Treynor in August
Highs average 83°28° and lows 62°17°, with 4.9 in124 mm of precipitation in a typical August.
- Record high
- 109°43° (1934)
- Record low
- 35°2° (1950)
- Heating degree days
- 9
- Cooling degree days
- 240
Treynor in September
Highs average 77°25° and lows 53°12°, with 3.6 in92 mm of precipitation in a typical September.
- Record high
- 103°39° (1939)
- Record low
- 22°−6° (1942)
- Heating degree days
- 107
- Cooling degree days
- 100
Treynor in OctoberThis month
Highs average 64°18° and lows 41°5°, with 3 in75 mm of precipitation and 1 in2.5 cm of snow in a typical October.
- Record high
- 94°34° (2024)
- Record low
- −2°−19° (1925)
- Heating degree days
- 407
- Cooling degree days
- 12
Treynor in November
Highs average 48°9° and lows 28°−2°, with 1.6 in40 mm of precipitation and 1.2 in3 cm of snow in a typical November.
- Record high
- 83°28° (1999)
- Record low
- −17°−27° (1964)
- Heating degree days
- 815
- Cooling degree days
- 0
Treynor in December
Highs average 35°2° and lows 17°−8°, with 1.3 in33 mm of precipitation and 7 in17 cm of snow in a typical December.
- Record high
- 71°22° (2021)
- Record low
- −30°−34° (1983)
- Heating degree days
- 1206
- Cooling degree days
- 0