Spencer weather by month
What a typical year looks like in Spencer, Iowa: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at SPENCER 1 N, 2 km from Spencer; records cover 1895–2026.
The year at a glance
- Precipitation a year
- 31 in787 mm
- Snow a year
- 43 in110 cm
- Last spring freeze
- Apr 29
- First fall freeze
- Sep 29
- Heating degree days
- 7,560
- Cooling degree days
- 712
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 94°34° (cooling, 1%).
Month by month
Spencer in January
Highs average 25°−4° and lows 7°−14°, with 0.72 in18 mm of precipitation and 10 in25 cm of snow in a typical January.
- Record high
- 66°19° (1944)
- Record low
- −38°−39° (1912)
- Heating degree days
- 1517
- Cooling degree days
- 0
Spencer in February
Highs average 30°−1° and lows 11°−11°, with 0.79 in20 mm of precipitation and 9 in23 cm of snow in a typical February.
- Record high
- 71°22° (2024)
- Record low
- −36°−38° (1899)
- Heating degree days
- 1243
- Cooling degree days
- 0
Spencer in March
Highs average 43°6° and lows 24°−5°, with 1.7 in42 mm of precipitation and 6 in15 cm of snow in a typical March.
- Record high
- 88°31° (2026)
- Record low
- −28°−33° (1948)
- Heating degree days
- 982
- Cooling degree days
- 0
Spencer in April
Highs average 58°14° and lows 35°2°, with 3.5 in89 mm of precipitation and 3 in8 cm of snow in a typical April.
- Record high
- 93°34° (2007)
- Record low
- 0°−18° (1975)
- Heating degree days
- 565
- Cooling degree days
- 4
Spencer in May
Highs average 70°21° and lows 47°9°, with 4.2 in106 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 109°43° (1934)
- Record low
- 20°−7° (1967)
- Heating degree days
- 240
- Cooling degree days
- 43
Spencer in June
Highs average 80°27° and lows 58°15°, with 4.6 in117 mm of precipitation in a typical June.
- Record high
- 106°41° (1933)
- Record low
- 30°−1° (1896)
- Heating degree days
- 35
- Cooling degree days
- 164
Spencer in July
Highs average 84°29° and lows 62°17°, with 3.7 in95 mm of precipitation in a typical July.
- Record high
- 113°45° (1936)
- Record low
- 40°4° (1971)
- Heating degree days
- 8
- Cooling degree days
- 249
Spencer in August
Highs average 81°27° and lows 59°15°, with 3.8 in96 mm of precipitation in a typical August.
- Record high
- 111°44° (1930)
- Record low
- 34°1° (1950)
- Heating degree days
- 21
- Cooling degree days
- 176
Spencer in September
Highs average 75°24° and lows 50°10°, with 3.3 in84 mm of precipitation in a typical September.
- Record high
- 102°39° (1925)
- Record low
- 21°−6° (1942)
- Heating degree days
- 148
- Cooling degree days
- 70
Spencer in OctoberThis month
Highs average 60°16° and lows 37°3°, with 2.4 in60 mm of precipitation and 0.7 in1.8 cm of snow in a typical October.
- Record high
- 93°34° (1963)
- Record low
- −8°−22° (1925)
- Heating degree days
- 510
- Cooling degree days
- 6
Spencer in November
Highs average 44°6° and lows 24°−5°, with 1.4 in36 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 80°27° (2006)
- Record low
- −17°−27° (1959)
- Heating degree days
- 938
- Cooling degree days
- 0
Spencer in December
Highs average 30°−1° and lows 13°−11°, with 0.98 in25 mm of precipitation and 10 in24 cm of snow in a typical December.
- Record high
- 66°19° (1998)
- Record low
- −30°−34° (1914)
- Heating degree days
- 1353
- Cooling degree days
- 0