Oakville weather by month
What a typical year looks like in Oakville, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at New Boston Dam 17, 11 km from Oakville; records cover 1938–2026.
The year at a glance
- Precipitation a year
- 36.3 in922 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 21
- Heating degree days
- 6,023
- Cooling degree days
- 1,032
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 95°35° (cooling, 1%).
Month by month
Oakville in January
Highs average 32°0° and lows 15°−9°, with 1.3 in33 mm of precipitation in a typical January.
- Record high
- 64°18° (2003)
- Record low
- −26°−32° (2019)
- Heating degree days
- 1289
- Cooling degree days
- 0
Oakville in February
Highs average 36°2° and lows 19°−7°, with 1.7 in44 mm of precipitation in a typical February.
- Record high
- 75°24° (2024)
- Record low
- −25°−32° (2019)
- Heating degree days
- 1050
- Cooling degree days
- 0
Oakville in March
Highs average 49°9° and lows 30°−1°, with 2.6 in67 mm of precipitation in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −14°−26° (2015)
- Heating degree days
- 804
- Cooling degree days
- 1
Oakville in April
Highs average 62°17° and lows 40°5°, with 3.6 in90 mm of precipitation in a typical April.
- Record high
- 88°31° (2002)
- Record low
- 17°−8° (2018)
- Heating degree days
- 422
- Cooling degree days
- 7
Oakville in May
Highs average 73°23° and lows 52°11°, with 5.1 in128 mm of precipitation in a typical May.
- Record high
- 111°44° (1939)
- Record low
- 28°−2° (1947)
- Heating degree days
- 152
- Cooling degree days
- 69
Oakville in June
Highs average 83°28° and lows 62°17°, with 4.6 in117 mm of precipitation in a typical June.
- Record high
- 99°37° (1938)
- Record low
- 31°−1° (2001)
- Heating degree days
- 16
- Cooling degree days
- 232
Oakville in July
Highs average 86°30° and lows 65°19°, with 3.5 in89 mm of precipitation in a typical July.
- Record high
- 105°41° (2011)
- Record low
- 49°9° (1945)
- Heating degree days
- 2
- Cooling degree days
- 332
Oakville in August
Highs average 84°29° and lows 63°17°, with 3.8 in97 mm of precipitation in a typical August.
- Record high
- 103°39° (2023)
- Record low
- 46°8° (1942)
- Heating degree days
- 4
- Cooling degree days
- 265
Oakville in September
Highs average 77°25° and lows 55°13°, with 3.3 in85 mm of precipitation in a typical September.
- Record high
- 99°37° (2011)
- Record low
- 30°−1° (1942)
- Heating degree days
- 82
- Cooling degree days
- 110
Oakville in OctoberThis month
Highs average 64°18° and lows 43°6°, with 2.9 in73 mm of precipitation in a typical October.
- Record high
- 92°33° (1997)
- Record low
- 21°−6° (1942)
- Heating degree days
- 363
- Cooling degree days
- 16
Oakville in November
Highs average 49°10° and lows 32°0°, with 2.1 in54 mm of precipitation in a typical November.
- Record high
- 82°28° (2016)
- Record low
- 6°−14° (1947)
- Heating degree days
- 731
- Cooling degree days
- 0
Oakville in December
Highs average 37°3° and lows 22°−6°, with 1.8 in45 mm of precipitation in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −18°−28° (2000)
- Heating degree days
- 1108
- Cooling degree days
- 0