Photo: Ascended Dreamer · CC BY 4.0Derby Line gets about 99 inches of snow a winter, more than 97% of U.S. towns
Peak summer warmth arrives in July, with afternoons near 77°. From frosty January to warm July, readings climb 71°. Summers stay cool: July afternoons here are cooler than in 97% of U.S. towns. Garden planting can start around May 14; autumn frost returns near September 30.
A year in Derby Line at a glance
Each month’s typical high and low, and what it brings.
What stands out about Derby Line’s climate
Compared with towns across the U.S., with Derby Line’s place in Vermont beside it.
What a year in Derby Line feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 138 frost-free days a year
In half of years the last 32° night comes by May 14 and the first by September 30. Frost and day counts come from NOAA’s station at Newport, VT, 5 miles from the town’s center, 210 ft lower.
The 2023 USDA map puts Derby Line’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −24°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 99 inches of snow a winter
Snow, measured at Newport, VT, falls mostly in December. Precipitation (rain plus melted snow) adds up to 47 inches a year; August is the wettest month and February the driest. Rain or snow falls on about 174 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Derby Line
97% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Newport, VT.
Living with Derby Line’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
138 frost-free days in zone 4b. The last frost comes by May 14 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 30.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.2 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Derby Line from natural hazards, river flooding is the largest share (77%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Derby Line and similar climates
TownRatings has no climate map of the towns around Derby Line yet.
Climates most like Derby Line’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Derby Line, VT | 6° | 77° | 47" | 99" |
| Houlton, ME | 4° | 78° | 42" | 96" |
| Wilna, NY | 8° | 79° | 42" | 127" |
| Sault Ste. Marie, MI | 8° | 76° | 37" | 120" |
| Dalton, MA | 13° | 80° | 48" | 77" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Derby Line averaged 1.7° warmer than the 1900s. The biggest change is in December (+3.9°).
A bigger shift than in 72% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Derby Line compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Derby Line’s place among Vermont’s.
Derby Line weather by month
Highs, lows and precipitation from NOAA’s grid at Derby Line’s center; snow, wet days and snow on the ground from Newport, VT. 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 | 36° | 17° | 2.9" | 19.4" | 14 | 26 | 15° – 36° |
| April | 50° | 30° | 3.7" | 4.5" | 13 | 6 | 35° – 45° |
| May | 64° | 42° | 4.3" | 0.0" | 14 | 0 | 47° – 58° |
| June | 73° | 51° | 4.9" | 0.0" | 15 | 0 | 59° – 67° |
| July | 77° | 56° | 4.9" | 0.0" | 15 | 0 | 62° – 70° |
| August | 75° | 54° | 5.0" | 0.0" | 13 | 0 | 62° – 68° |
| September | 68° | 47° | 4.1" | 0.0" | 12 | 0 | 53° – 62° |
| October | 54° | 36° | 4.6" | 0.8" | 15 | 0 | 41° – 53° |
| November | 41° | 26° | 3.5" | 7.0" | 15 | 6 | 28° – 41° |
| December | 30° | 15° | 3.8" | 25.2" | 17 | 23 | 14° – 34° |
| Year | 52° | 32° | 47.2" | 98.6" | 174 | 119 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 1° to 24°. August is the most reliable, staying within 7°.
Where Derby Line’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Derby Line’s center.
- Snow: Newport, VT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Newport, VT, 5 miles from the town’s center, 210 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Derby Line’s climate
What is the weather like in Derby Line?
A typical July afternoon reaches 77°, a January night drops to 6°, and about 99 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; cooler July afternoons than 97% of U.S. towns.
How cold does it get in Derby Line in winter?
January nights average 6°. About 171 nights a year reach 32° or below and 32 reach 0° or below. In the coldest January of the last 30 years the month averaged 1°.
How much snow does Derby Line get?
About 99 inches in a normal winter at Newport, VT, most of it in December, with snow on the ground about 119 days a year.
How hot does it get in Derby Line?
July, with a typical high of 77° and a low of 56°. About 3 days a year reach 90° (Newport, VT).
When is the first and last frost in Derby Line?
In half of years the last spring frost (32°) comes by May 14 and the first fall frost by September 30, about 138 frost-free days, at Newport, VT.
What growing zone is Derby Line in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −24°.
What is the best time of year to visit Derby Line?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Derby Line getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Derby Line.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.