Plymouth weather by month
What a typical year looks like in Plymouth, Utah: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Trenton, 20 km from Plymouth; records cover 1944–2026.
The year at a glance
- Precipitation a year
- 16.9 in429 mm
- Snow a year
- 49 in124 cm
- Last spring freeze
- May 12
- First fall freeze
- Sep 21
- Heating degree days
- 7,312
- Cooling degree days
- 368
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Plymouth in January
Highs average 32°0° and lows 12°−11°, with 1.5 in38 mm of precipitation and 14 in35 cm of snow in a typical January.
- Record high
- 60°16° (2003)
- Record low
- −32°−36° (1984)
- Heating degree days
- 1336
- Cooling degree days
- 0
Plymouth in February
Highs average 37°3° and lows 17°−8°, with 1.4 in36 mm of precipitation and 10 in26 cm of snow in a typical February.
- Record high
- 64°18° (2015)
- Record low
- −36°−38° (1985)
- Heating degree days
- 1068
- Cooling degree days
- 0
Plymouth in March
Highs average 50°10° and lows 26°−4°, with 1.7 in43 mm of precipitation and 4 in11 cm of snow in a typical March.
- Record high
- 81°27° (2026)
- Record low
- −11°−24° (1945)
- Heating degree days
- 845
- Cooling degree days
- 0
Plymouth in April
Highs average 59°15° and lows 32°0°, with 2 in52 mm of precipitation and 1.9 in4.8 cm of snow in a typical April.
- Record high
- 85°29° (1946)
- Record low
- 10°−12° (2023)
- Heating degree days
- 588
- Cooling degree days
- 0
Plymouth in May
Highs average 69°21° and lows 39°4°, with 2.2 in56 mm of precipitation and 0.1 in0.3 cm of snow in a typical May.
- Record high
- 94°34° (2003)
- Record low
- 21°−6° (2013)
- Heating degree days
- 346
- Cooling degree days
- 4
Plymouth in June
Highs average 79°26° and lows 45°7°, with 1.2 in30 mm of precipitation in a typical June.
- Record high
- 100°38° (1988)
- Record low
- 28°−2° (1989)
- Heating degree days
- 125
- Cooling degree days
- 44
Plymouth in July
Highs average 89°32° and lows 51°11°, with 0.56 in14 mm of precipitation in a typical July.
- Record high
- 105°41° (2026)
- Record low
- 34°1° (1993)
- Heating degree days
- 19
- Cooling degree days
- 177
Plymouth in August
Highs average 88°31° and lows 49°9°, with 0.83 in21 mm of precipitation in a typical August.
- Record high
- 102°39° (1948)
- Record low
- 26°−3° (2019)
- Heating degree days
- 32
- Cooling degree days
- 128
Plymouth in September
Highs average 77°25° and lows 40°4°, with 1.3 in32 mm of precipitation in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 19°−7° (1985)
- Heating degree days
- 210
- Cooling degree days
- 15
Plymouth in OctoberThis month
Highs average 63°17° and lows 31°−1°, with 1.5 in39 mm of precipitation and 0.4 in1 cm of snow in a typical October.
- Record high
- 87°31° (1992)
- Record low
- 3°−16° (2019)
- Heating degree days
- 571
- Cooling degree days
- 0
Plymouth in November
Highs average 47°8° and lows 23°−5°, with 1.3 in32 mm of precipitation and 5 in12 cm of snow in a typical November.
- Record high
- 74°23° (2014)
- Record low
- −17°−27° (1979)
- Heating degree days
- 904
- Cooling degree days
- 0
Plymouth in December
Highs average 34°1° and lows 14°−10°, with 1.4 in36 mm of precipitation and 14 in34 cm of snow in a typical December.
- Record high
- 62°17° (1995)
- Record low
- −29°−34° (1983)
- Heating degree days
- 1268
- Cooling degree days
- 0