Merrill weather by month
What a typical year looks like in Merrill, Wisconsin: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Merrill, 3 km from Merrill; records cover 1905–2026.
The year at a glance
- Precipitation a year
- 33.8 in858 mm
- Snow a year
- 54 in138 cm
- Last spring freeze
- May 17
- First fall freeze
- Sep 29
- Heating degree days
- 8,669
- Cooling degree days
- 373
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −20°−29° (heating, 99%) and 90°32° (cooling, 1%).
Month by month
Merrill in January
Highs average 22°−6° and lows 3°−16°, with 1.2 in30 mm of precipitation and 12 in31 cm of snow in a typical January.
- Record high
- 57°14° (1942)
- Record low
- −48°−44° (1909)
- Heating degree days
- 1621
- Cooling degree days
- 0
Merrill in February
Highs average 27°−3° and lows 5°−15°, with 1.1 in27 mm of precipitation and 12 in29 cm of snow in a typical February.
- Record high
- 65°18° (2024)
- Record low
- −42°−41° (1907)
- Heating degree days
- 1376
- Cooling degree days
- 0
Merrill in March
Highs average 39°4° and lows 17°−8°, with 1.8 in44 mm of precipitation and 7 in18 cm of snow in a typical March.
- Record high
- 86°30° (1910)
- Record low
- −35°−37° (1962)
- Heating degree days
- 1152
- Cooling degree days
- 0
Merrill in April
Highs average 53°12° and lows 30°−1°, with 2.9 in74 mm of precipitation and 6 in14 cm of snow in a typical April.
- Record high
- 92°33° (1952)
- Record low
- −5°−21° (1924)
- Heating degree days
- 713
- Cooling degree days
- 0
Merrill in May
Highs average 67°19° and lows 43°6°, with 3.7 in94 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 104°40° (1934)
- Record low
- 18°−8° (1907)
- Heating degree days
- 341
- Cooling degree days
- 19
Merrill in June
Highs average 76°24° and lows 53°12°, with 4.6 in118 mm of precipitation in a typical June.
- Record high
- 104°40° (1934)
- Record low
- 28°−2° (1945)
- Heating degree days
- 92
- Cooling degree days
- 81
Merrill in July
Highs average 80°27° and lows 57°14°, with 3.8 in97 mm of precipitation in a typical July.
- Record high
- 110°43° (1936)
- Record low
- 33°1° (1972)
- Heating degree days
- 32
- Cooling degree days
- 145
Merrill in August
Highs average 78°26° and lows 55°13°, with 4.1 in103 mm of precipitation in a typical August.
- Record high
- 101°38° (1936)
- Record low
- 30°−1° (1915)
- Heating degree days
- 56
- Cooling degree days
- 96
Merrill in September
Highs average 70°21° and lows 46°8°, with 3.9 in98 mm of precipitation in a typical September.
- Record high
- 97°36° (1931)
- Record low
- 18°−8° (1974)
- Heating degree days
- 240
- Cooling degree days
- 30
Merrill in OctoberThis month
Highs average 55°13° and lows 35°1°, with 3.2 in80 mm of precipitation and 0.9 in2.3 cm of snow in a typical October.
- Record high
- 89°32° (1905)
- Record low
- 4°−16° (1925)
- Heating degree days
- 624
- Cooling degree days
- 2
Merrill in November
Highs average 40°4° and lows 23°−5°, with 2.1 in52 mm of precipitation and 5 in13 cm of snow in a typical November.
- Record high
- 75°24° (1909)
- Record low
- −15°−26° (1976)
- Heating degree days
- 1008
- Cooling degree days
- 0
Merrill in December
Highs average 27°−3° and lows 11°−11°, with 1.5 in39 mm of precipitation and 12 in29 cm of snow in a typical December.
- Record high
- 62°17° (1909)
- Record low
- −31°−35° (1983)
- Heating degree days
- 1414
- Cooling degree days
- 0