St. Francis weather by month
What a typical year looks like in St. Francis, South Dakota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Mission 14 S, 24 km from St. Francis; records cover 1951–2026.
The year at a glance
- Precipitation a year
- 22.5 in572 mm
- Snow a year
- 41 in104 cm
- Last spring freeze
- May 12
- First fall freeze
- Sep 29
- Heating degree days
- 7,314
- Cooling degree days
- 689
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −12°−24° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
St. Francis in January
Highs average 33°1° and lows 11°−12°, with 0.4 in10 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 71°22° (1987)
- Record low
- −28°−33° (1966)
- Heating degree days
- 1330
- Cooling degree days
- 0
St. Francis in February
Highs average 37°3° and lows 13°−10°, with 0.66 in17 mm of precipitation and 7 in17 cm of snow in a typical February.
- Record high
- 75°24° (1995)
- Record low
- −30°−34° (1996)
- Heating degree days
- 1120
- Cooling degree days
- 0
St. Francis in March
Highs average 47°8° and lows 22°−6°, with 1.1 in27 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 86°30° (2026)
- Record low
- −26°−32° (1960)
- Heating degree days
- 941
- Cooling degree days
- 0
St. Francis in April
Highs average 57°14° and lows 31°−1°, with 2.7 in68 mm of precipitation and 7 in19 cm of snow in a typical April.
- Record high
- 95°35° (1989)
- Record low
- 3°−16° (2018)
- Heating degree days
- 632
- Cooling degree days
- 1
St. Francis in May
Highs average 68°20° and lows 42°6°, with 3.7 in93 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 98°37° (1959)
- Record low
- 19°−7° (1967)
- Heating degree days
- 326
- Cooling degree days
- 20
St. Francis in June
Highs average 79°26° and lows 53°12°, with 3.9 in100 mm of precipitation in a typical June.
- Record high
- 109°43° (1988)
- Record low
- 31°−1° (1969)
- Heating degree days
- 73
- Cooling degree days
- 106
St. Francis in July
Highs average 87°31° and lows 59°15°, with 3.1 in79 mm of precipitation in a typical July.
- Record high
- 114°46° (2007)
- Record low
- 39°4° (1971)
- Heating degree days
- 11
- Cooling degree days
- 262
St. Francis in August
Highs average 86°30° and lows 57°14°, with 2.2 in55 mm of precipitation in a typical August.
- Record high
- 108°42° (2002)
- Record low
- 37°3° (1964)
- Heating degree days
- 22
- Cooling degree days
- 219
St. Francis in September
Highs average 77°25° and lows 48°9°, with 1.8 in46 mm of precipitation in a typical September.
- Record high
- 104°40° (1952)
- Record low
- 20°−7° (1974)
- Heating degree days
- 159
- Cooling degree days
- 76
St. Francis in OctoberThis month
Highs average 61°16° and lows 34°1°, with 1.6 in41 mm of precipitation and 2.1 in5.3 cm of snow in a typical October.
- Record high
- 95°35° (1989)
- Record low
- 0°−18° (1991)
- Heating degree days
- 537
- Cooling degree days
- 5
St. Francis in November
Highs average 47°8° and lows 23°−5°, with 0.74 in19 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 85°29° (1999)
- Record low
- −21°−29° (1959)
- Heating degree days
- 909
- Cooling degree days
- 0
St. Francis in December
Highs average 35°2° and lows 14°−10°, with 0.62 in16 mm of precipitation and 7 in18 cm of snow in a typical December.
- Record high
- 74°23° (2025)
- Record low
- −31°−35° (1990)
- Heating degree days
- 1254
- Cooling degree days
- 0