Derby, VT climate
Derby has cold, snowy winters and pleasant summers. A typical July afternoon reaches 77°, a January night drops to 6°, and about 99 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Derby feels like
Winter
Spring
Summer
Fall
Derby weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 24° | 6° | 3.1" | 21.5" | 18 | 30 | 1° – 24° |
| February | 27° | 7° | 2.6" | 20.2" | 13 | 28 | 2° – 24° |
| March | 37° | 17° | 2.8" | 19.4" | 14 | 26 | 15° – 36° |
| April | 51° | 30° | 3.7" | 4.5" | 13 | 6 | 35° – 45° |
| May | 65° | 42° | 4.2" | 0 | 14 | 0 | 47° – 58° |
| June | 73° | 51° | 4.8" | 0 | 15 | 0 | 59° – 67° |
| July | 77° | 56° | 4.9" | 0 | 15 | 0 | 62° – 70° |
| August | 76° | 54° | 4.9" | 0 | 13 | 0 | 62° – 69° |
| September | 68° | 47° | 4.0" | 0 | 12 | 0 | 53° – 62° |
| October | 55° | 37° | 4.5" | 0.8" | 15 | 0 | 41° – 53° |
| November | 41° | 26° | 3.4" | 7.0" | 15 | 6 | 28° – 41° |
| December | 30° | 15° | 3.7" | 25.2" | 17 | 23 | 14° – 34° |
| Year | 52° | 32° | 46.6" | 98.6" | 174 | 119 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Derby
Derby gets 47 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 174 days a year. Snow covers the ground about 119 days of the year.
About 138 frost-free days a year
In half of years the last 32° night comes by May 14 and the first one by September 30. That leaves about 138 frost-free days for gardens, shorter than 90% of U.S. towns.
Heating and cooling a home in Derby
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Derby, 97% of that work is heating and 3% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Derby and its neighbors
Derby borders 6 towns with climate data. January nights across them vary by 0.8°. Charleston has the coldest January nights (5°) and Newport the hottest July afternoons (79°). Derby’s January low is 6° and its July high 77°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Derby compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Derby averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.9°). The shift is larger than in 80% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Derby’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. January swings the most: between 1991 and 2020 its average temperature ranged from 1° to 24°. August is the most reliable, staying within 7°.
Common questions about Derby’s climate
What is the coldest month in Derby?
January, with a typical high of 24° and a low of 6°.
What is the hottest month in Derby?
July, with a typical high of 77° and a low of 56°. About 3 days a year reach 90°.
How much snow does Derby get?
About 99 inches in a normal winter, most of it in December.
When is the first frost in Derby?
In half of years the first 32° night comes by September 30, and the last spring frost by May 14.
What is the rainiest month in Derby?
August, with 4.9 inches of rain and melted snow. The year totals 47 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Derby itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Newport, VT (3 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.