Lewis gets about 164 inches of snow a winter, more than all but 39 U.S. towns
Expect July afternoons of about 76°. Summers stay cool: July afternoons here are cooler than in 98% of U.S. towns. The latest 30-year average runs 1.5° warmer than 1901–2000’s, with December up the most. Homes need heating from October to April, the months averaging under 50°.
A year in Lewis at a glance
Each month’s typical high and low, and what it brings.
What stands out about Lewis’ climate
Compared with towns across the U.S., with Lewis’ place in New York beside it.
What a year in Lewis feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 145 frost-free days a year
In half of years the last 32° night comes by May 10 and the first by October 4. Frost and day counts come from NOAA’s station at Boonville 4 Ssw, NY, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Lewis’ center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −22°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 164 inches of snow a winter
Snow, measured at Boonville 4 Ssw, NY, is heaviest from January through February, about 39 inches a month. Precipitation (rain plus melted snow) adds up to 54 inches a year; October is the wettest month and February the driest. Rain or snow falls on about 181 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Lewis
98% 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 Boonville 4 Ssw, NY.
Living with Lewis’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
145 frost-free days in zone 4b. The last frost comes by May 10 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. 28 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Lewis from natural hazards, river flooding is the largest share (78%); heat waves, cold waves, winter storms and ice storms together are 9%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Lewis and its neighbors
West Turin has the coldest January nights next door (7°, 2° colder) and Annsville the hottest July afternoons (79°, 3° 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 Lewis’, 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 |
|---|---|---|---|---|
| Lewis, NY | 9° | 76° | 54" | 164" |
| Stowe, VT | 7° | 78° | 45" | 139" |
| Rumford, ME | 7° | 77° | 52" | 88" |
| Corry, PA | 16° | 80° | 47" | 114" |
| Sault Ste. Marie, MI | 8° | 76° | 37" | 120" |
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 Lewis averaged 1.5° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 58% 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 Lewis compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Lewis’ place among New York’s.
Lewis weather by month
Highs, lows and precipitation from NOAA’s grid at Lewis’ center; snow, wet days and snow on the ground from Boonville 4 Ssw, NY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 9° | 4.6" | 39.7" | 20 | 29 | 5° – 27° |
| February | 29° | 10° | 3.6" | 39.2" | 16 | 28 | 5° – 27° |
| March | 37° | 18° | 3.8" | 26.7" | 15 | 27 | 19° – 40° |
| April | 51° | 31° | 4.3" | 6.2" | 14 | 9 | 34° – 47° |
| May | 64° | 42° | 4.5" | 0.2" | 14 | 0 | 47° – 59° |
| June | 72° | 51° | 4.9" | 0.0" | 14 | 0 | 58° – 67° |
| July | 76° | 56° | 4.5" | 0.0" | 13 | 0 | 61° – 70° |
| August | 75° | 55° | 4.2" | 0.0" | 13 | 0 | 61° – 68° |
| September | 68° | 48° | 4.4" | 0.0" | 13 | 0 | 54° – 63° |
| October | 56° | 38° | 5.6" | 1.4" | 16 | 1 | 41° – 53° |
| November | 43° | 27° | 4.7" | 15.5" | 16 | 10 | 29° – 41° |
| December | 32° | 17° | 4.9" | 35.1" | 19 | 24 | 16° – 36° |
| Year | 52° | 33° | 54.0" | 164.0" | 181 | 128 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 5° to 27°. August is the most reliable, staying within 7°.
Where Lewis’ 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 Lewis’ center.
- Snow: Boonville 4 Ssw, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boonville 4 Ssw, NY, 10 miles from the town’s center, at about the same height; 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 Lewis’ climate
What is the weather like in Lewis?
A typical July afternoon reaches 76°, a January night drops to 9°, and about 164 inches of snow falls in a normal winter. Colder January nights than 95% of U.S. towns; cooler July afternoons than 98% of U.S. towns.
How cold does it get in Lewis in winter?
January nights average 9°. About 170 nights a year reach 32° or below and 23 reach 0° or below. In the coldest January of the last 30 years the month averaged 5°.
How much snow does Lewis get?
About 164 inches in a normal winter at Boonville 4 Ssw, NY, heaviest from January through February, about 39 inches a month, with snow on the ground about 128 days a year.
How hot does it get in Lewis?
July, with a typical high of 76°. 90° days are rare: none in a normal year at Boonville 4 Ssw, NY.
When is the first and last frost in Lewis?
In half of years the last spring frost (32°) comes by May 10 and the first fall frost by October 4, about 145 frost-free days, at Boonville 4 Ssw, NY.
What growing zone is Lewis in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −22°.
What is the best time of year to visit Lewis?
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 Lewis getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 58% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Lewis.
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.