Numa weather by month
What a typical year looks like in Numa, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Rathbun Dam, 16 km from Numa; records cover 1970–2026.
The year at a glance
- Precipitation a year
- 38.6 in980 mm
- Snow a year
- Rare
- Last spring freeze
- Apr 17
- First fall freeze
- Oct 18
- Heating degree days
- 6,263
- Cooling degree days
- 975
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −7°−22° (heating, 99%) and 95°35° (cooling, 1%).
Month by month
Numa in January
Highs average 31°0° and lows 13°−11°, with 1.1 in28 mm of precipitation in a typical January.
- Record high
- 67°19° (2003)
- Record low
- −28°−33° (1974)
- Heating degree days
- 1333
- Cooling degree days
- 0
Numa in February
Highs average 37°3° and lows 16°−9°, with 1.5 in38 mm of precipitation in a typical February.
- Record high
- 76°24° (2017)
- Record low
- −26°−32° (1996)
- Heating degree days
- 1089
- Cooling degree days
- 0
Numa in March
Highs average 50°10° and lows 28°−2°, with 2 in52 mm of precipitation in a typical March.
- Record high
- 91°33° (2026)
- Record low
- −11°−24° (1978)
- Heating degree days
- 815
- Cooling degree days
- 1
Numa in April
Highs average 62°17° and lows 39°4°, with 3.9 in100 mm of precipitation in a typical April.
- Record high
- 89°32° (1980)
- Record low
- 12°−11° (2018)
- Heating degree days
- 449
- Cooling degree days
- 6
Numa in May
Highs average 71°22° and lows 51°11°, with 5.4 in136 mm of precipitation in a typical May.
- Record high
- 97°36° (2018)
- Record low
- 28°−2° (1989)
- Heating degree days
- 171
- Cooling degree days
- 58
Numa in June
Highs average 81°27° and lows 61°16°, with 5.2 in133 mm of precipitation in a typical June.
- Record high
- 103°39° (1988)
- Record low
- 41°5° (1974)
- Heating degree days
- 19
- Cooling degree days
- 203
Numa in July
Highs average 85°29° and lows 66°19°, with 4.6 in116 mm of precipitation in a typical July.
- Record high
- 106°41° (2012)
- Record low
- 43°6° (1971)
- Heating degree days
- 2
- Cooling degree days
- 321
Numa in August
Highs average 84°29° and lows 64°18°, with 4.6 in117 mm of precipitation in a typical August.
- Record high
- 104°40° (1984)
- Record low
- 43°6° (1971)
- Heating degree days
- 6
- Cooling degree days
- 270
Numa in September
Highs average 77°25° and lows 54°12°, with 3.8 in97 mm of precipitation in a typical September.
- Record high
- 99°37° (2013)
- Record low
- 30°−1° (1984)
- Heating degree days
- 95
- Cooling degree days
- 101
Numa in OctoberThis month
Highs average 65°18° and lows 42°6°, with 2.9 in74 mm of precipitation in a typical October.
- Record high
- 92°33° (1997)
- Record low
- 16°−9° (1972)
- Heating degree days
- 378
- Cooling degree days
- 15
Numa in November
Highs average 50°10° and lows 29°−1°, with 2 in52 mm of precipitation in a typical November.
- Record high
- 79°26° (1999)
- Record low
- −8°−22° (1991)
- Heating degree days
- 764
- Cooling degree days
- 0
Numa in December
Highs average 37°3° and lows 19°−7°, with 1.5 in37 mm of precipitation in a typical December.
- Record high
- 74°23° (2021)
- Record low
- −26°−32° (1989)
- Heating degree days
- 1142
- Cooling degree days
- 0