Grand Isle County weather, town by town
5 places in Grand Isle County, Vermont, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1969 to 2024. Station extremes, not official state records.
Grand Isle County Weather Facts
Grand Isle County has 5 places on myweatherrock (5 towns), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 100°F at St Bernard De Lacolle on August 1, 1975. The coldest night is -31°F at S Hero on January 27, 1994. The wettest day brought 5.35 inches of rain at St Bernard De Lacolle on August 28, 2011. The biggest single-day snow measured 25.59 inches at St Bernard De Lacolle on March 14, 2017. Those are station measurements from NOAA's daily records, 1969 to 2024, not official state records. By area the largest place is Alburgh, about 29 square miles.
About Grand Isle County weather
The map on the Now tab shows every Grand Isle County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 5 Grand Isle County towns with station normals, the warmest month is July, when the day usually reaches 81°F, and the coldest is January, when the night usually falls to 10°F. May is the wettest, with rain on about 12 days. January nights run from about 8°F in Alburgh to 12°F in Grand Isle.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
Grand Isle County weather records
Measured at the NOAA stations serving these towns, daily records 1969 to 2024. Station extremes, not official state records.
Common questions about Grand Isle County weather
- What is the hottest temperature recorded at a Grand Isle County station?
- 100°F at St Bernard De Lacolle on August 1, 1975, in the NOAA daily station records myweatherrock holds (1969 to 2024).
- What is the coldest temperature recorded at a Grand Isle County station?
- -31°F at S Hero on January 27, 1994.
- What is the most rain a Grand Isle County station has measured in one day?
- 5.35 inches at St Bernard De Lacolle on August 28, 2011.
- What is the biggest one-day snowfall at a Grand Isle County station?
- 25.59 inches at St Bernard De Lacolle on March 14, 2017.
- How many Grand Isle County towns have a weather page here?
- 5: 5 towns. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the Grand Isle County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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