Rochester weather by month
What a typical year looks like in Rochester, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Muscatine 2n, 24 km from Rochester; records cover 1999–2026.
The year at a glance
- Precipitation a year
- 38.3 in974 mm
- Snow a year
- 29 in75 cm
- Last spring freeze
- Apr 14
- First fall freeze
- Oct 18
- Heating degree days
- 6,285
- Cooling degree days
- 897
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −6°−21° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Rochester in January
Highs average 31°−1° and lows 14°−10°, with 1.4 in36 mm of precipitation and 7 in18 cm of snow in a typical January.
- Record high
- 64°18° (2003)
- Record low
- −25°−32° (2019)
- Heating degree days
- 1324
- Cooling degree days
- 0
Rochester in February
Highs average 35°2° and lows 18°−8°, with 1.6 in41 mm of precipitation and 9 in22 cm of snow in a typical February.
- Record high
- 76°24° (2024)
- Record low
- −25°−32° (2019)
- Heating degree days
- 1078
- Cooling degree days
- 0
Rochester in March
Highs average 48°9° and lows 28°−2°, with 2.4 in62 mm of precipitation and 4 in10 cm of snow in a typical March.
- Record high
- 87°31° (2026)
- Record low
- −10°−23° (2014)
- Heating degree days
- 840
- Cooling degree days
- 2
Rochester in April
Highs average 61°16° and lows 39°4°, with 3.6 in90 mm of precipitation and 0.7 in1.8 cm of snow in a typical April.
- Record high
- 88°31° (2007)
- Record low
- 15°−9° (2018)
- Heating degree days
- 452
- Cooling degree days
- 8
Rochester in May
Highs average 72°22° and lows 51°10°, with 4.9 in124 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 30°−1° (2005)
- Heating degree days
- 176
- Cooling degree days
- 56
Rochester in June
Highs average 81°27° and lows 61°16°, with 5.4 in136 mm of precipitation in a typical June.
- Record high
- 99°37° (2009)
- Record low
- 44°7° (2023)
- Heating degree days
- 21
- Cooling degree days
- 189
Rochester in July
Highs average 84°29° and lows 64°18°, with 4.4 in112 mm of precipitation in a typical July.
- Record high
- 103°39° (2012)
- Record low
- 51°11° (2013)
- Heating degree days
- 3
- Cooling degree days
- 290
Rochester in August
Highs average 83°28° and lows 62°17°, with 4 in102 mm of precipitation in a typical August.
- Record high
- 99°37° (2006)
- Record low
- 47°8° (2004)
- Heating degree days
- 8
- Cooling degree days
- 231
Rochester in September
Highs average 77°25° and lows 54°12°, with 3.5 in88 mm of precipitation in a typical September.
- Record high
- 99°37° (2000)
- Record low
- 35°2° (2003)
- Heating degree days
- 93
- Cooling degree days
- 105
Rochester in OctoberThis month
Highs average 64°18° and lows 43°6°, with 2.9 in75 mm of precipitation and 0.3 in0.8 cm of snow in a typical October.
- Record high
- 94°34° (2006)
- Record low
- 22°−6° (2022)
- Heating degree days
- 382
- Cooling degree days
- 16
Rochester in November
Highs average 49°9° and lows 31°−1°, with 2.2 in56 mm of precipitation and 1.4 in3.6 cm of snow in a typical November.
- Record high
- 80°27° (2000)
- Record low
- 1°−17° (2019)
- Heating degree days
- 761
- Cooling degree days
- 0
Rochester in December
Highs average 36°2° and lows 20°−7°, with 2 in51 mm of precipitation and 7 in19 cm of snow in a typical December.
- Record high
- 73°23° (2021)
- Record low
- −15°−26° (2000)
- Heating degree days
- 1147
- Cooling degree days
- 0