Danbury weather by month
What a typical year looks like in Danbury, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mapleton No.2, 6 km from Danbury; records cover 1937–2026.
The year at a glance
- Precipitation a year
- 32.2 in818 mm
- Snow a year
- 31 in79 cm
- Last spring freeze
- May 1
- First fall freeze
- Sep 29
- Heating degree days
- 7,194
- Cooling degree days
- 738
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −11°−24° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Danbury in January
Highs average 28°−2° and lows 9°−13°, with 0.76 in19 mm of precipitation and 7 in17 cm of snow in a typical January.
- Record high
- 68°20° (2002)
- Record low
- −32°−36° (1970)
- Heating degree days
- 1447
- Cooling degree days
- 0
Danbury in February
Highs average 33°1° and lows 13°−11°, with 0.92 in23 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −35°−37° (2021)
- Heating degree days
- 1180
- Cooling degree days
- 0
Danbury in March
Highs average 47°8° and lows 24°−4°, with 1.8 in46 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 93°34° (2026)
- Record low
- −25°−32° (1948)
- Heating degree days
- 923
- Cooling degree days
- 0
Danbury in April
Highs average 60°15° and lows 35°2°, with 3.4 in86 mm of precipitation and 1.3 in3.3 cm of snow in a typical April.
- Record high
- 96°36° (1980)
- Record low
- −1°−18° (1975)
- Heating degree days
- 536
- Cooling degree days
- 4
Danbury in May
Highs average 71°21° and lows 47°9°, with 4.8 in121 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 101°38° (1967)
- Record low
- 23°−5° (1961)
- Heating degree days
- 230
- Cooling degree days
- 43
Danbury in June
Highs average 81°27° and lows 58°15°, with 4.6 in116 mm of precipitation in a typical June.
- Record high
- 104°40° (1988)
- Record low
- 36°2° (1945)
- Heating degree days
- 33
- Cooling degree days
- 166
Danbury in July
Highs average 84°29° and lows 62°17°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 106°41° (1947)
- Record low
- 42°6° (1971)
- Heating degree days
- 7
- Cooling degree days
- 258
Danbury in August
Highs average 82°28° and lows 59°15°, with 3.8 in97 mm of precipitation in a typical August.
- Record high
- 104°40° (1938)
- Record low
- 36°2° (1950)
- Heating degree days
- 22
- Cooling degree days
- 186
Danbury in September
Highs average 75°24° and lows 50°10°, with 3.1 in79 mm of precipitation in a typical September.
- Record high
- 104°40° (1939)
- Record low
- 22°−6° (1942)
- Heating degree days
- 146
- Cooling degree days
- 72
Danbury in OctoberThis month
Highs average 62°17° and lows 37°3°, with 2.3 in57 mm of precipitation and 0.6 in1.5 cm of snow in a typical October.
- Record high
- 94°34° (1963)
- Record low
- 10°−12° (1993)
- Heating degree days
- 484
- Cooling degree days
- 9
Danbury in November
Highs average 46°8° and lows 24°−4°, with 1.5 in37 mm of precipitation and 2.3 in5.8 cm of snow in a typical November.
- Record high
- 81°27° (2006)
- Record low
- −16°−27° (1937)
- Heating degree days
- 897
- Cooling degree days
- 0
Danbury in December
Highs average 33°0° and lows 14°−10°, with 1.1 in29 mm of precipitation and 7 in18 cm of snow in a typical December.
- Record high
- 69°21° (2021)
- Record low
- −28°−33° (1989)
- Heating degree days
- 1289
- Cooling degree days
- 0