Hannawa Falls, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hannawa Falls, a community in St. Lawrence County, New York.
Today
64°F
Sunny
Sunny, with a high near 64. Northeast wind around 3 mph.
7-day forecast for Hannawa Falls
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 64°F | Sunny | 3 mph NE | 0% |
| Tonight | 44°F | Mostly Cloudy | 3 mph E | 5% |
| Sunday | 58°F | Rain Showers | 1 to 6 mph SE | 90% |
| Sunday Night | 42°F | Mostly Cloudy | 3 mph NE | 3% |
| Monday | 58°F | Partly Sunny | 7 mph N | 0% |
| Monday Night | 40°F | Mostly Cloudy | 5 mph NE | 0% |
| Tuesday | 61°F | Mostly Sunny | 3 to 9 mph NE | 0% |
| Tuesday Night | 40°F | Partly Cloudy | 3 to 8 mph E | 0% |
| Wednesday | 67°F | Mostly Sunny | 3 to 7 mph E | 1% |
| Wednesday Night | 43°F | Partly Cloudy | 2 to 7 mph E | 5% |
| Thursday | 65°F | Mostly Sunny | 2 to 6 mph E | 8% |
| Thursday Night | 44°F | Mostly Cloudy | 2 to 6 mph NE | 14% |
| Friday | 65°F | Slight Chance Rain Showers | 3 to 8 mph NE | 15% |
| Friday Night | 44°F | Slight Chance Rain Showers then Partly Cloudy | 2 to 7 mph NE | 15% |
Forecast source: National Weather Service (api.weather.gov) for Hannawa Falls (44.601, -74.975). Updated through the day.
Growing snapshot for Hannawa Falls
Last spring frost
May 5
First fall frost
Oct 8
Growing season
156 days
Hardiness zone
4b
More local growing data for Hannawa Falls: nearby ZIP 13647 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Brasher Falls
Canton
Colton
Cranberry Lake
DeKalb Junction
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Gouverneur
Hailesboro
Hammond
Hermon
Heuvelton
Madrid
Massena
Norfolk
Norwood
Ogdensburg
Parishville
Potsdam
Rensselaer Falls
Richville
Star Lake
Waddington
Winthrop
Climate data from the nearest NOAA station, Colton 2 N, Ny (2.1 mi from Hannawa Falls). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.