Winthrop, NY Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winthrop, a community in St. Lawrence County, New York.
This Afternoon
62°F
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a high near 62. South wind around 6 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winthrop
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 62°F | Rain Showers Likely | 6 mph S | 55% |
| Tonight | 57°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph S | 23% |
| Wednesday | 74°F | Mostly Sunny | 5 to 9 mph SW | 6% |
| Wednesday Night | 58°F | Mostly Cloudy then Chance Rain Showers | 5 to 9 mph S | 32% |
| Thursday | 68°F | Rain Showers | 10 mph S | 87% |
| Thursday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 3 to 7 mph SW | 30% |
| Friday | 61°F | Slight Chance Light Rain | 5 mph W | 22% |
| Friday Night | 41°F | Chance Light Rain | 5 mph N | 30% |
| Saturday | 53°F | Chance Light Rain | 6 mph N | 37% |
| Saturday Night | 37°F | Chance Light Rain | 3 mph NW | 37% |
| Sunday | 50°F | Slight Chance Light Rain | 6 mph W | 24% |
| Sunday Night | 34°F | Slight Chance Light Rain | 3 mph SW | 22% |
| Monday | 48°F | Chance Light Rain | 2 to 7 mph W | 35% |
| Monday Night | 32°F | Chance Light Rain | 5 mph W | 30% |
Forecast source: National Weather Service (api.weather.gov) for Winthrop (44.804, -74.810). Updated through the day.
Growing snapshot for Winthrop
Last spring frost
May 10
First fall frost
Oct 5
Growing season
148 days
Hardiness zone
4b
More local growing data for Winthrop: nearby ZIP 13697 weather · frost dates · planting calendar · New York frost dates
Nearby towns & communities
Brasher Falls
Canton
Colton
Cranberry Lake
DeKalb Junction
Edwards
Gouverneur
Hailesboro
Hammond
Hannawa Falls
Hermon
Heuvelton
Madrid
Massena
Norfolk
Norwood
Ogdensburg
Parishville
Potsdam
Rensselaer Falls
Richville
Star Lake
Waddington
Climate data from the nearest NOAA station, Lawrenceville 3 Sw, Ny (6.9 mi from Winthrop). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.