Preston weather by month
What a typical year looks like in Preston, Maryland: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Royal Oak 2 Ssw, 25 km from Preston; records cover 1948–2026.
The year at a glance
- Precipitation a year
- 47.6 in1209 mm
- Snow a year
- 14 in36 cm
- Last spring freeze
- Apr 3
- First fall freeze
- Nov 8
- Heating degree days
- 3,972
- Cooling degree days
- 1,474
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 15°−9° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Preston in January
Highs average 45°7° and lows 29°−1°, with 3.5 in89 mm of precipitation and 5 in13 cm of snow in a typical January.
- Record high
- 77°25° (1950)
- Record low
- −6°−21° (1982)
- Heating degree days
- 870
- Cooling degree days
- 0
Preston in February
Highs average 47°9° and lows 31°−1°, with 3.1 in78 mm of precipitation and 5 in12 cm of snow in a typical February.
- Record high
- 77°25° (2018)
- Record low
- −3°−19° (1979)
- Heating degree days
- 729
- Cooling degree days
- 0
Preston in March
Highs average 56°13° and lows 37°3°, with 4.4 in112 mm of precipitation and 2.3 in5.8 cm of snow in a typical March.
- Record high
- 87°31° (1998)
- Record low
- 10°−12° (2015)
- Heating degree days
- 578
- Cooling degree days
- 2
Preston in April
Highs average 67°19° and lows 47°8°, with 3.7 in93 mm of precipitation and 0.1 in0.3 cm of snow in a typical April.
- Record high
- 93°34° (1990)
- Record low
- 23°−5° (1982)
- Heating degree days
- 269
- Cooling degree days
- 22
Preston in May
Highs average 75°24° and lows 56°13°, with 4 in100 mm of precipitation in a typical May.
- Record high
- 97°36° (2011)
- Record low
- 35°2° (1957)
- Heating degree days
- 81
- Cooling degree days
- 106
Preston in June
Highs average 84°29° and lows 66°19°, with 4 in103 mm of precipitation in a typical June.
- Record high
- 101°38° (1959)
- Record low
- 43°6° (1997)
- Heating degree days
- 6
- Cooling degree days
- 294
Preston in July
Highs average 88°31° and lows 70°21°, with 4.3 in110 mm of precipitation in a typical July.
- Record high
- 102°39° (2010)
- Record low
- 51°11° (1977)
- Heating degree days
- 0
- Cooling degree days
- 437
Preston in August
Highs average 86°30° and lows 68°20°, with 4.8 in121 mm of precipitation in a typical August.
- Record high
- 101°38° (1953)
- Record low
- 45°7° (1986)
- Heating degree days
- 0
- Cooling degree days
- 377
Preston in September
Highs average 80°27° and lows 62°16°, with 4.2 in106 mm of precipitation in a typical September.
- Record high
- 97°36° (1954)
- Record low
- 37°3° (1963)
- Heating degree days
- 23
- Cooling degree days
- 197
Preston in OctoberThis month
Highs average 69°21° and lows 51°10°, with 4.4 in111 mm of precipitation in a typical October.
- Record high
- 95°35° (1954)
- Record low
- 25°−4° (1969)
- Heating degree days
- 198
- Cooling degree days
- 37
Preston in November
Highs average 58°14° and lows 41°5°, with 3.4 in86 mm of precipitation in a typical November.
- Record high
- 84°29° (1950)
- Record low
- 16°−9° (1955)
- Heating degree days
- 472
- Cooling degree days
- 2
Preston in December
Highs average 49°9° and lows 33°1°, with 3.9 in100 mm of precipitation and 1.8 in4.6 cm of snow in a typical December.
- Record high
- 76°24° (1998)
- Record low
- 4°−16° (1983)
- Heating degree days
- 746
- Cooling degree days
- 0