Photo: Department of Homeland Security. Federal Emergency Management Agency. Public Affairs Division. 3/1/2003 · Public domainBlenheim sits near the bottom of U.S. towns for July heat
In January the night’s low is typically 12°. Winter nights are cold: in January they are colder than in 91% of U.S. towns. Since 1901–2000, the year has warmed by 1.2°, most of all in December. The outdoor season runs from May to September, with highs of 67–79°.
A year in Blenheim at a glance
Each month’s typical high and low, and what it brings.
What stands out about Blenheim’s climate
Compared with towns across the U.S., with Blenheim’s place in New York beside it.
What a year in Blenheim feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 148 frost-free days a year
In half of years the last 32° night comes by May 9 and the first by October 4. Frost and day counts come from NOAA’s station at Cobleskill 2 Ese, NY, 13 miles from the town’s center, 450 ft lower.
The 2023 USDA map puts Blenheim’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −13°. 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 54 inches of snow a winter
Snow, measured at Cobleskill 2 Ese, NY, falls mostly in January, March and December. Precipitation (rain plus melted snow) adds up to 43 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 140 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Blenheim
95% 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 Cobleskill 2 Ese, NY.
Living with Blenheim’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
148 frost-free days in zone 5b. The last frost comes by May 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 4.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 25 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Blenheim from natural hazards, river flooding is the largest share (88%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Blenheim and its neighbors
Summit has the coldest January nights next door (11°, 1° colder) and Gilboa the hottest July afternoons (81°, 2° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Blenheim’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 |
|---|---|---|---|---|
| Blenheim, NY | 12° | 79° | 43" | 54" |
| Milton, VT | 10° | 80° | 40" | 50" |
| Augusta, ME | 10° | 80° | 45" | 69" |
| Treasure Lake, PA | 17° | 80° | 45" | 53" |
| Meredith, NH | 11° | 81° | 46" | 62" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Blenheim averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.9°).
A smaller shift than in 65% 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 Blenheim compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Blenheim’s place among New York’s.
Blenheim weather by month
Highs, lows and precipitation from NOAA’s grid at Blenheim’s center; snow, wet days and snow on the ground from Cobleskill 2 Ese, NY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 12° | 2.7" | 13.7" | 12 | 21 | 11° – 29° |
| February | 33° | 14° | 2.3" | 10.7" | 10 | 20 | 8° – 30° |
| March | 41° | 21° | 3.1" | 12.4" | 11 | 16 | 23° – 43° |
| April | 55° | 31° | 3.5" | 1.5" | 11 | 3 | 36° – 48° |
| May | 67° | 43° | 3.8" | 0.0" | 13 | 0 | 50° – 60° |
| June | 74° | 51° | 4.4" | 0.0" | 13 | 0 | 60° – 67° |
| July | 79° | 56° | 4.1" | 0.0" | 12 | 0 | 63° – 71° |
| August | 77° | 55° | 4.3" | 0.0" | 12 | 0 | 62° – 70° |
| September | 70° | 48° | 4.1" | 0.0" | 11 | 0 | 55° – 63° |
| October | 58° | 37° | 4.1" | 0.4" | 13 | 0 | 43° – 54° |
| November | 46° | 29° | 2.9" | 1.7" | 10 | 3 | 32° – 43° |
| December | 35° | 19° | 3.2" | 13.1" | 11 | 14 | 20° – 39° |
| Year | 55° | 35° | 42.5" | 53.5" | 140 | 78 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 8° to 30°. June is the most reliable, staying within 8°.
Where Blenheim’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 Blenheim’s center.
- Snow: Cobleskill 2 Ese, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Cobleskill 2 Ese, NY, 13 miles from the town’s center, 450 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 Blenheim’s climate
What is the weather like in Blenheim?
A typical July afternoon reaches 79°, a January night drops to 12°, and about 54 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; cooler July afternoons than 95% of U.S. towns.
How cold does it get in Blenheim in winter?
January nights average 12°. About 155 nights a year reach 32° or below and 12 reach 0° or below. In the coldest January of the last 30 years the month averaged 11°.
How much snow does Blenheim get?
About 54 inches in a normal winter at Cobleskill 2 Ese, NY, most of it in January, March and December, with snow on the ground about 78 days a year.
How hot does it get in Blenheim?
July, with a typical high of 79° and a low of 56°. About 4 days a year reach 90° (Cobleskill 2 Ese, NY).
When is the first and last frost in Blenheim?
In half of years the last spring frost (32°) comes by May 9 and the first fall frost by October 4, about 148 frost-free days, at Cobleskill 2 Ese, NY.
What growing zone is Blenheim in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −13°.
What is the best time of year to visit Blenheim?
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 Blenheim getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Blenheim.
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.