Marietta weather by month
What a typical year looks like in Marietta, Minnesota: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Madison Wwtp, 20 km from Marietta; records cover 1940–2026.
The year at a glance
- Precipitation a year
- 25.6 in651 mm
- Snow a year
- 47 in119 cm
- Last spring freeze
- May 2
- First fall freeze
- Oct 1
- Heating degree days
- 8,281
- Cooling degree days
- 608
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −18°−28° (heating, 99%) and 94°34° (cooling, 1%).
Month by month
Marietta in January
Highs average 22°−6° and lows 3°−16°, with 0.54 in14 mm of precipitation and 8 in20 cm of snow in a typical January.
- Record high
- 67°19° (1981)
- Record low
- −35°−37° (1970)
- Heating degree days
- 1638
- Cooling degree days
- 0
Marietta in February
Highs average 26°−3° and lows 7°−14°, with 0.6 in15 mm of precipitation and 9 in24 cm of snow in a typical February.
- Record high
- 66°19° (1991)
- Record low
- −36°−38° (1994)
- Heating degree days
- 1356
- Cooling degree days
- 0
Marietta in March
Highs average 39°4° and lows 20°−7°, with 1.3 in33 mm of precipitation and 8 in20 cm of snow in a typical March.
- Record high
- 84°29° (2012)
- Record low
- −23°−31° (1948)
- Heating degree days
- 1108
- Cooling degree days
- 0
Marietta in April
Highs average 55°13° and lows 33°0°, with 2.4 in61 mm of precipitation and 6 in15 cm of snow in a typical April.
- Record high
- 96°36° (1962)
- Record low
- 0°−18° (1975)
- Heating degree days
- 639
- Cooling degree days
- 1
Marietta in May
Highs average 69°20° and lows 47°8°, with 3.2 in82 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 102°39° (2018)
- Record low
- 20°−7° (1946)
- Heating degree days
- 266
- Cooling degree days
- 36
Marietta in June
Highs average 79°26° and lows 58°14°, with 3.8 in97 mm of precipitation in a typical June.
- Record high
- 105°41° (1988)
- Record low
- 32°0° (1964)
- Heating degree days
- 45
- Cooling degree days
- 139
Marietta in July
Highs average 83°28° and lows 61°16°, with 3.6 in91 mm of precipitation in a typical July.
- Record high
- 110°43° (1988)
- Record low
- 40°4° (1967)
- Heating degree days
- 10
- Cooling degree days
- 224
Marietta in August
Highs average 80°27° and lows 58°15°, with 3.4 in85 mm of precipitation in a typical August.
- Record high
- 110°43° (1988)
- Record low
- 34°1° (1974)
- Heating degree days
- 29
- Cooling degree days
- 150
Marietta in September
Highs average 73°23° and lows 49°10°, with 2.6 in67 mm of precipitation in a typical September.
- Record high
- 100°38° (1959)
- Record low
- 17°−8° (1974)
- Heating degree days
- 170
- Cooling degree days
- 53
Marietta in OctoberThis month
Highs average 58°15° and lows 36°2°, with 2.5 in64 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 96°36° (1963)
- Record low
- 4°−16° (2020)
- Heating degree days
- 564
- Cooling degree days
- 5
Marietta in November
Highs average 41°5° and lows 22°−5°, with 1.1 in29 mm of precipitation and 6 in14 cm of snow in a typical November.
- Record high
- 81°27° (2020)
- Record low
- −18°−28° (1964)
- Heating degree days
- 1002
- Cooling degree days
- 0
Marietta in December
Highs average 27°−3° and lows 9°−13°, with 0.59 in15 mm of precipitation and 10 in25 cm of snow in a typical December.
- Record high
- 63°17° (1988)
- Record low
- −35°−37° (1973)
- Heating degree days
- 1454
- Cooling degree days
- 0