Lyon Mountain weather by month
What a typical year looks like in Lyon Mountain, New York: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Dannemora, 12 km from Lyon Mountain; records cover 1906–2026.
The year at a glance
- Precipitation a year
- 43.4 in1101 mm
- Snow a year
- Rare
- Last spring freeze
- May 8
- First fall freeze
- Oct 11
- Heating degree days
- 7,717
- Cooling degree days
- 390
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 88°31° (cooling, 1%).
Month by month
Lyon Mountain in January
Highs average 28°−2° and lows 9°−13°, with 2.9 in74 mm of precipitation in a typical January.
- Record high
- 64°18° (1995)
- Record low
- −34°−37° (1981)
- Heating degree days
- 1454
- Cooling degree days
- 0
Lyon Mountain in February
Highs average 31°−1° and lows 11°−12°, with 2.3 in58 mm of precipitation in a typical February.
- Record high
- 67°19° (2018)
- Record low
- −39° (2023)
- Heating degree days
- 1242
- Cooling degree days
- 0
Lyon Mountain in March
Highs average 40°4° and lows 20°−7°, with 2.8 in71 mm of precipitation in a typical March.
- Record high
- 79°26° (1945)
- Record low
- −22°−30° (1989)
- Heating degree days
- 1091
- Cooling degree days
- 0
Lyon Mountain in April
Highs average 53°12° and lows 33°0°, with 3.8 in97 mm of precipitation in a typical April.
- Record high
- 88°31° (2002)
- Record low
- −1°−18° (1923)
- Heating degree days
- 666
- Cooling degree days
- 2
Lyon Mountain in May
Highs average 67°19° and lows 45°7°, with 4 in100 mm of precipitation in a typical May.
- Record high
- 94°34° (1911)
- Record low
- 18°−8° (1983)
- Heating degree days
- 297
- Cooling degree days
- 21
Lyon Mountain in June
Highs average 75°24° and lows 54°12°, with 4.9 in124 mm of precipitation in a typical June.
- Record high
- 97°36° (1947)
- Record low
- 30°−1° (1910)
- Heating degree days
- 87
- Cooling degree days
- 73
Lyon Mountain in July
Highs average 79°26° and lows 59°15°, with 4.2 in108 mm of precipitation in a typical July.
- Record high
- 98°37° (1978)
- Record low
- 40°4° (1914)
- Heating degree days
- 19
- Cooling degree days
- 145
Lyon Mountain in August
Highs average 78°25° and lows 57°14°, with 4.1 in104 mm of precipitation in a typical August.
- Record high
- 98°37° (1944)
- Record low
- 32°0° (2026)
- Heating degree days
- 36
- Cooling degree days
- 110
Lyon Mountain in September
Highs average 71°22° and lows 50°10°, with 3.9 in98 mm of precipitation in a typical September.
- Record high
- 95°35° (1961)
- Record low
- 25°−4° (1980)
- Heating degree days
- 176
- Cooling degree days
- 37
Lyon Mountain in OctoberThis month
Highs average 58°14° and lows 39°4°, with 4.7 in119 mm of precipitation in a typical October.
- Record high
- 88°31° (1950)
- Record low
- 13°−11° (1922)
- Heating degree days
- 524
- Cooling degree days
- 2
Lyon Mountain in November
Highs average 44°7° and lows 28°−2°, with 2.9 in74 mm of precipitation in a typical November.
- Record high
- 75°24° (2024)
- Record low
- −8°−22° (1917)
- Heating degree days
- 873
- Cooling degree days
- 0
Lyon Mountain in December
Highs average 33°1° and lows 16°−9°, with 2.9 in75 mm of precipitation in a typical December.
- Record high
- 65°18° (2001)
- Record low
- −36°−38° (1933)
- Heating degree days
- 1252
- Cooling degree days
- 0