Few U.S. towns have colder winter nights than Hewitt
Expect July afternoons of about 80°. In July, afternoons here are cooler than in 92% of U.S. towns. Decade by decade the climate has edged up, 1.5° above 1901–2000. The heating season runs October to April: each of those months averages under 50°.
A year in Hewitt at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hewitt’s climate
Compared with towns across the U.S., with Hewitt’s place in Wisconsin beside it.
What a year in Hewitt feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 150 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 5. Frost and day counts come from NOAA’s station at Marshfield Exp Farm, WI, 1.4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Hewitt’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −20°. 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 57 inches of snow a winter
Snow, measured at Marshfield Exp Farm, WI, falls mostly in January and December. Precipitation (rain plus melted snow) adds up to 32 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 128 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hewitt
95% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Marshfield Exp Farm, WI.
Living with Hewitt’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
150 frost-free days in zone 5a. The last frost comes by May 5 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 5.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Hewitt from natural hazards, river flooding is the largest share (42%); heat waves, cold waves, winter storms and ice storms together are 39%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hewitt and similar climates
TownRatings has no climate map of the towns around Hewitt yet.
Climates most like Hewitt’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 |
|---|---|---|---|---|
| Hewitt, WI | 6° | 80° | 32" | 57" |
| St. Francis, MN | 4° | 82° | 32" | 56" |
| Plattsburgh, NY | 9° | 80° | 34" | 50" |
| Clear Lake, IA | 7° | 82° | 36" | 44" |
| Houghton Lake, MI | 12° | 81° | 33" | 66" |
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 Hewitt averaged 1.5° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 57% 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 Hewitt compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hewitt’s place among Wisconsin’s.
Hewitt weather by month
Highs, lows and precipitation from NOAA’s grid at Hewitt’s center; snow, wet days and snow on the ground from Marshfield Exp Farm, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 23° | 6° | 1.0" | 12.4" | 10 | 27 | 3° – 26° |
| February | 28° | 8° | 1.0" | 11.7" | 8 | 27 | 6° – 30° |
| March | 40° | 20° | 1.6" | 8.8" | 9 | 18 | 20° – 45° |
| April | 54° | 32° | 3.0" | 5.1" | 11 | 3 | 33° – 50° |
| May | 67° | 44° | 3.9" | 0.1" | 14 | 0 | 49° – 62° |
| June | 76° | 54° | 4.6" | 0.0" | 13 | 0 | 61° – 69° |
| July | 80° | 58° | 3.7" | 0.0" | 12 | 0 | 63° – 74° |
| August | 78° | 56° | 3.9" | 0.0" | 11 | 0 | 61° – 71° |
| September | 70° | 48° | 3.8" | 0.0" | 12 | 0 | 52° – 65° |
| October | 56° | 36° | 2.9" | 0.7" | 11 | 0 | 40° – 52° |
| November | 41° | 25° | 1.7" | 4.9" | 9 | 4 | 23° – 43° |
| December | 28° | 13° | 1.3" | 13.4" | 10 | 21 | 8° – 31° |
| Year | 53° | 33° | 32.3" | 57.1" | 128 | 100 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 20° to 45°. June is the most reliable, staying within 9°.
Where Hewitt’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 Hewitt’s center.
- Snow: Marshfield Exp Farm, WI (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Marshfield Exp Farm, WI, 1.4 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 Hewitt’s climate
What is the weather like in Hewitt?
A typical July afternoon reaches 80°, a January night drops to 6°, and about 57 inches of snow falls in a normal winter. Colder January nights than 98% of U.S. towns; cooler July afternoons than 92% of U.S. towns.
How cold does it get in Hewitt in winter?
January nights average 6°. About 166 nights a year reach 32° or below and 27 reach 0° or below. In the coldest January of the last 30 years the month averaged 3°.
How much snow does Hewitt get?
About 57 inches in a normal winter at Marshfield Exp Farm, WI, most of it in January and December, with snow on the ground about 100 days a year.
How hot does it get in Hewitt?
July, with a typical high of 80° and a low of 58°. About 4 days a year reach 90° (Marshfield Exp Farm, WI).
When is the first and last frost in Hewitt?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 5, about 150 frost-free days, at Marshfield Exp Farm, WI.
What growing zone is Hewitt in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −20°.
What is the best time of year to visit Hewitt?
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 Hewitt getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 57% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hewitt.
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.