Bolan weather by month
What a typical year looks like in Bolan, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at MASON CITY, 24 km from Bolan; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 36.3 in921 mm
- Snow a year
- Rare
- Last spring freeze
- May 1
- First fall freeze
- Oct 6
- Heating degree days
- 7,653
- Cooling degree days
- 606
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −14°−26° (heating, 99%) and 92°33° (cooling, 1%).
Month by month
Bolan in January
Highs average 24°−4° and lows 7°−14°, with 0.89 in23 mm of precipitation in a typical January.
- Record high
- 62°17° (1944)
- Record low
- −34°−37° (1899)
- Heating degree days
- 1534
- Cooling degree days
- 0
Bolan in February
Highs average 29°−2° and lows 11°−12°, with 1.1 in27 mm of precipitation in a typical February.
- Record high
- 74°23° (2024)
- Record low
- −45°−43° (1996)
- Heating degree days
- 1267
- Cooling degree days
- 0
Bolan in March
Highs average 41°5° and lows 23°−5°, with 2 in50 mm of precipitation in a typical March.
- Record high
- 84°29° (1986)
- Record low
- −32°−36° (1962)
- Heating degree days
- 1019
- Cooling degree days
- 0
Bolan in April
Highs average 56°14° and lows 35°2°, with 3.9 in99 mm of precipitation in a typical April.
- Record high
- 95°35° (1980)
- Record low
- 5°−15° (1982)
- Heating degree days
- 586
- Cooling degree days
- 2
Bolan in May
Highs average 69°20° and lows 47°8°, with 5.6 in142 mm of precipitation in a typical May.
- Record high
- 104°40° (1934)
- Record low
- 23°−5° (1945)
- Heating degree days
- 257
- Cooling degree days
- 32
Bolan in June
Highs average 79°26° and lows 58°14°, with 5.7 in145 mm of precipitation in a typical June.
- Record high
- 104°40° (1934)
- Record low
- 31°−1° (1928)
- Heating degree days
- 43
- Cooling degree days
- 137
Bolan in July
Highs average 82°28° and lows 62°16°, with 4.6 in118 mm of precipitation in a typical July.
- Record high
- 107°42° (1936)
- Record low
- 38°3° (1899)
- Heating degree days
- 10
- Cooling degree days
- 218
Bolan in August
Highs average 80°26° and lows 59°15°, with 3.7 in94 mm of precipitation in a typical August.
- Record high
- 103°39° (1930)
- Record low
- 30°−1° (1915)
- Heating degree days
- 23
- Cooling degree days
- 153
Bolan in September
Highs average 74°23° and lows 50°10°, with 3.2 in82 mm of precipitation in a typical September.
- Record high
- 103°39° (1922)
- Record low
- 15°−9° (1899)
- Heating degree days
- 154
- Cooling degree days
- 58
Bolan in OctoberThis month
Highs average 60°16° and lows 38°3°, with 2.6 in65 mm of precipitation in a typical October.
- Record high
- 94°34° (1963)
- Record low
- −4°−20° (1925)
- Heating degree days
- 507
- Cooling degree days
- 6
Bolan in November
Highs average 43°6° and lows 25°−4°, with 1.8 in45 mm of precipitation in a typical November.
- Record high
- 79°26° (2006)
- Record low
- −14°−26° (1897)
- Heating degree days
- 922
- Cooling degree days
- 0
Bolan in December
Highs average 30°−1° and lows 14°−10°, with 1.3 in32 mm of precipitation in a typical December.
- Record high
- 68°20° (2021)
- Record low
- −26°−32° (1914)
- Heating degree days
- 1331
- Cooling degree days
- 0