DeKalb Junction, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for DeKalb Junction, a community in St. Lawrence County, New York.
Tonight
49°F
Partly Cloudy
Partly cloudy, with a low around 49. South wind around 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for DeKalb Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Partly Cloudy | 10 mph S | 11% |
| Wednesday | 76°F | Mostly Sunny | 6 to 9 mph S | 5% |
| Wednesday Night | 53°F | Mostly Cloudy then Light Rain Likely | 7 to 13 mph S | 65% |
| Thursday | 71°F | Rain Showers | 10 to 15 mph SW | 87% |
| Thursday Night | 49°F | Slight Chance Rain Showers | 3 to 8 mph SW | 22% |
| Friday | 61°F | Slight Chance Rain Showers | 3 mph W | 22% |
| Friday Night | 41°F | Slight Chance Light Rain | 3 mph N | 24% |
| Saturday | 52°F | Chance Light Rain | 3 to 7 mph N | 41% |
| Saturday Night | 36°F | Chance Light Rain | 5 mph W | 41% |
| Sunday | 50°F | Chance Light Rain then Partly Sunny | 3 to 8 mph SW | 32% |
| Sunday Night | 33°F | Chance Light Rain | 5 mph SW | 27% |
| Monday | 50°F | Chance Light Rain | 3 to 9 mph W | 27% |
| Monday Night | 33°F | Chance Light Rain | 6 mph SW | 26% |
| Tuesday | 51°F | Chance Light Rain | 6 to 13 mph SW | 26% |
Forecast source: National Weather Service (api.weather.gov) for DeKalb Junction (44.512, -75.298). Updated through the day.
Growing snapshot for DeKalb Junction
Last spring frost
May 9
First fall frost
Sep 30
Growing season
142 days
Hardiness zone
4b
More local growing data for DeKalb Junction: nearby ZIP 13630 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Brasher Falls
Canton
Colton
Cranberry Lake
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Hailesboro
Hammond
Hannawa Falls
Hermon
Heuvelton
Madrid
Massena
Norfolk
Norwood
Ogdensburg
Parishville
Potsdam
Rensselaer Falls
Richville
Star Lake
Waddington
Winthrop
Climate data from the nearest NOAA station, Canton 4 Se, Ny (11.3 mi from DeKalb Junction). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.