Photo: Royalbroil · CC BY-SA 3.0Summers in Herman are cooler than in 92% of U.S. towns
The depth of winter brings overnight lows near 12°. The wettest month is June; the driest is February. In January, nights here are colder than in 91% of U.S. towns. Garden planting can start around May 5; autumn frost returns near October 8.
A year in Herman at a glance
Each month’s typical high and low, and what it brings.
What stands out about Herman’s climate
Compared with towns across the U.S., with Herman’s place in Wisconsin beside it.
What a year in Herman feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 154 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 8. Frost and day counts come from NOAA’s station at Sheboygan Co Mem Airport, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Herman’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 45 inches of snow a winter
Snow, measured at Plymouth Wwtp, WI, falls mostly in January. 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 121 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Herman
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 Sheboygan Co Mem Airport.
Living with Herman’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
154 frost-free days in zone 5b. 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 8.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 3.1 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Herman from natural hazards, river flooding is the largest share (61%); heat waves, cold waves, winter storms and ice storms together are 17%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Herman and its neighbors
Rhine has the coldest January nights next door (11°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Herman’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 |
|---|---|---|---|---|
| Herman, WI | 12° | 80° | 32" | 45" |
| Plattsburgh, NY | 9° | 80° | 34" | 50" |
| Houghton Lake, MI | 12° | 81° | 33" | 66" |
| Lakeville, MN | 7° | 82° | 33" | 41" |
| Colchester, VT | 10° | 81° | 38" | 50" |
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 Herman averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.3°).
A bigger shift than in 63% 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 Herman compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Herman’s place among Wisconsin’s.
Herman weather by month
Highs, lows and precipitation from NOAA’s grid at Herman’s center; snow, wet days and snow on the ground from Plymouth Wwtp, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 27° | 12° | 1.5" | 12.4" | 9 | 24 | 9° – 31° |
| February | 30° | 15° | 1.3" | 11.0" | 9 | 22 | 11° – 32° |
| March | 41° | 24° | 1.9" | 5.9" | 9 | 10 | 25° – 46° |
| April | 53° | 34° | 3.4" | 2.1" | 11 | 1 | 36° – 48° |
| May | 65° | 44° | 3.7" | 0.2" | 13 | 0 | 48° – 60° |
| June | 75° | 55° | 4.2" | 0.0" | 12 | 0 | 61° – 70° |
| July | 80° | 59° | 3.6" | 0.0" | 11 | 0 | 64° – 75° |
| August | 78° | 58° | 3.4" | 0.0" | 10 | 0 | 63° – 73° |
| September | 71° | 51° | 2.7" | 0.0" | 9 | 0 | 55° – 65° |
| October | 58° | 40° | 2.9" | 0.1" | 11 | 0 | 45° – 55° |
| November | 44° | 29° | 2.1" | 2.3" | 9 | 2 | 28° – 44° |
| December | 32° | 19° | 1.7" | 10.7" | 9 | 13 | 14° – 36° |
| Year | 54° | 37° | 32.2" | 44.7" | 121 | 71 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 9° to 31°. June is the most reliable, staying within 9°.
Where Herman’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 Herman’s center.
- Snow: Plymouth Wwtp, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sheboygan Co Mem Airport, 6 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 Herman’s climate
What is the weather like in Herman?
A typical July afternoon reaches 80°, a January night drops to 12°, and about 45 inches of snow falls in a normal winter. Colder January nights than 91% of U.S. towns; cooler July afternoons than 92% of U.S. towns.
How cold does it get in Herman in winter?
January nights average 12°. About 151 nights a year reach 32° or below and 16 reach 0° or below. In the coldest January of the last 30 years the month averaged 9°.
How much snow does Herman get?
About 45 inches in a normal winter at Plymouth Wwtp, WI, most of it in January, with snow on the ground about 71 days a year.
How hot does it get in Herman?
July, with a typical high of 80° and a low of 59°. About 6 days a year reach 90° (Sheboygan Co Mem Airport).
When is the first and last frost in Herman?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 8, about 154 frost-free days, at Sheboygan Co Mem Airport.
What growing zone is Herman 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 Herman?
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 Herman getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 63% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Herman.
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.