Grammar Airport Weather Forecast
- 14
- 27
Snow Showers
- 12
- 19
Chance Snow Showers
- 17
- 26
Chance Snow Showers
- 15
- 23
Slight Chance Snow Showers
- 19
- 27
Chance Snow Showers
- 19
- 31
Chance Snow Showers
Today 31 Dec Ontario
A chance of lake effect snow Showers in the Morning, then lake effect snow Showers likely in the afternoon. Snow may be heavy at Times in the afternoon. Additional accumulation in the most persistent Snows Ranging from 1 to 2 Inches across the lower Elevations to 2 to 4 Inches across the higher Terrain. Highs Ranging from the lower 20s on the Hilltops to the upper 20s across the lower Elevations. West Winds 10 to 15 Mph. Chance of snow 70 percent.
Tonight 31 Dec Ontario
Lake effect snow Showers. Snow may be heavy at Times in the evening. Additional accumulation in the most persistent Snows Ranging from 1 to 2 Inches across the lower Elevations to 2 to 3 Inches across the higher Terrain. Lows 10 to 15. West Winds 5 to 10 Mph, increasing to 10 to 15 Mph. Chance of snow 90 percent.
Grammar Airport Temperature Statistics
December Temperature
Penn Yan, Penn Yan Airport (16.2 miles)
Lowest 4 December, 2025
3 °FAverage December
27.3 °FHighest 19 December, 2025
54 °F
Climate (2020–Present)
Penn Yan, Penn Yan Airport (16.2 miles)
Average Low 2020–2025
41.9 °FAverage 2020–2025
50.5 °FAverage High 2020–2025
59.2 °F