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.
Today
79°F
Sunny
Sunny, with a high near 79. Southwest wind 5 to 9 mph.
7-day forecast for DeKalb Junction
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Sunny | 5 to 9 mph SW | 0% |
| Tonight | 59°F | Clear | 3 to 7 mph S | 0% |
| Wednesday | 84°F | Sunny | 6 mph S | 0% |
| Wednesday Night | 66°F | Partly Cloudy then Slight Chance Rain Showers | 3 mph S | 19% |
| Thursday | 84°F | Showers And Thunderstorms Likely | 6 mph SW | 67% |
| Thursday Night | 66°F | Showers And Thunderstorms Likely | 3 mph SW | 67% |
| Friday | 81°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph SW | 50% |
| Friday Night | 63°F | Chance Showers And Thunderstorms | 2 mph SW | 50% |
| Saturday | 82°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 41% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 5 mph SW | 26% |
| Sunday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 12 mph SW | 20% |
| Sunday Night | 64°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 to 10 mph SW | 45% |
| Monday | 80°F | Chance Rain Showers | 7 to 10 mph SW | 54% |
| Monday Night | 61°F | Chance Showers And Thunderstorms | 2 to 9 mph SW | 54% |
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
Edwards
Gouverneur
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 Aug 4, 2026.