Granger weather by month
What a typical year looks like in Granger, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at DES MOINES WSFO-JOHNSTON, 8 km from Granger; records cover 1995–2026.
The year at a glance
- Precipitation a year
- 36.2 in918 mm
- Snow a year
- 38 in97 cm
- Last spring freeze
- Apr 20
- First fall freeze
- Oct 13
- Heating degree days
- 6,318
- Cooling degree days
- 987
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −8°−22° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Granger in January
Highs average 30°−1° and lows 13°−10°, with 1 in26 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 67°19° (2002)
- Record low
- −23°−31° (2009)
- Heating degree days
- 1347
- Cooling degree days
- 0
Granger in February
Highs average 35°2° and lows 17°−8°, with 1.3 in32 mm of precipitation and 11 in27 cm of snow in a typical February.
- Record high
- 77°25° (2024)
- Record low
- −27°−33° (1996)
- Heating degree days
- 1086
- Cooling degree days
- 0
Granger in March
Highs average 49°9° and lows 29°−2°, with 2.2 in55 mm of precipitation and 5 in13 cm of snow in a typical March.
- Record high
- 92°33° (2026)
- Record low
- −12°−24° (2014)
- Heating degree days
- 817
- Cooling degree days
- 2
Granger in April
Highs average 62°16° and lows 40°5°, with 4 in102 mm of precipitation and 1.6 in4.1 cm of snow in a typical April.
- Record high
- 89°32° (2006)
- Record low
- 13°−11° (2018)
- Heating degree days
- 434
- Cooling degree days
- 8
Granger in May
Highs average 72°22° and lows 52°11°, with 4.8 in123 mm of precipitation and 0.2 in0.5 cm of snow in a typical May.
- Record high
- 96°36° (2018)
- Record low
- 28°−2° (2005)
- Heating degree days
- 162
- Cooling degree days
- 63
Granger in June
Highs average 81°27° and lows 62°17°, with 5.4 in136 mm of precipitation in a typical June.
- Record high
- 100°38° (2021)
- Record low
- 41°5° (1998)
- Heating degree days
- 17
- Cooling degree days
- 210
Granger in July
Highs average 85°29° and lows 66°19°, with 4.3 in108 mm of precipitation in a typical July.
- Record high
- 104°40° (2012)
- Record low
- 49°9° (1996)
- Heating degree days
- 3
- Cooling degree days
- 317
Granger in August
Highs average 83°28° and lows 64°18°, with 4 in101 mm of precipitation in a typical August.
- Record high
- 103°39° (2013)
- Record low
- 46°8° (2004)
- Heating degree days
- 6
- Cooling degree days
- 261
Granger in September
Highs average 76°25° and lows 55°13°, with 3.4 in86 mm of precipitation in a typical September.
- Record high
- 101°38° (2013)
- Record low
- 30°−1° (2003)
- Heating degree days
- 91
- Cooling degree days
- 110
Granger in OctoberThis month
Highs average 63°17° and lows 43°6°, with 2.5 in64 mm of precipitation and 0.5 in1.3 cm of snow in a typical October.
- Record high
- 93°34° (1997)
- Record low
- 16°−9° (1997)
- Heating degree days
- 394
- Cooling degree days
- 16
Granger in November
Highs average 48°9° and lows 30°−1°, with 2 in50 mm of precipitation and 2.2 in5.6 cm of snow in a typical November.
- Record high
- 81°27° (1999)
- Record low
- −3°−19° (2014)
- Heating degree days
- 786
- Cooling degree days
- 0
Granger in December
Highs average 35°2° and lows 19°−7°, with 1.5 in37 mm of precipitation and 8 in21 cm of snow in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −19°−28° (2017)
- Heating degree days
- 1175
- Cooling degree days
- 0