Grenell Weather Forecast
- 27
- 32
Chance Snow
- 26
- 36
Rain/Snow
- 22
- 30
Mostly Cloudy
- 28
- 36
Rain/Snow Likely
- 17
- 35
Rain/Snow Likely
- 19
- 28
Snow Showers Likely
Today 22 Dec Jefferson
Mostly cloudy with a 50 percent chance of snow Showers. Highs Ranging from around 30 inland to the mid 30s along the lake Ontario shore. Light Winds, becoming southwest 5 to 10 Mph.
Tonight 22 Dec Jefferson
Partly Cloudy, then becoming mostly cloudy. A chance of snow Showers late. Lows Ranging from 10 to 15 across the tug hill to 15 to 20 along the lake Ontario shore. Light Winds. Chance of snow 30 percent.
Grenell Temperature Statistics
December Temperature
Watertown, Watertown International Airport (19.9 miles)
Lowest 5 December, 2025
-6 °FAverage December
25.2 °FHighest 19 December, 2025
55 °F
Climate (2020–Present)
Watertown, Watertown International Airport (19.9 miles)
Average Low 2020–2025
38.8 °FAverage 2020–2025
48.6 °FAverage High 2020–2025
57.6 °F