Henry House · Photo: RobertDrake2015 · CC BY-SA 4.0Suamico has some of the coolest summers among U.S. towns
Nights in January average 13°. Expect the heaviest rain or snow in June and the lightest in February. Winter nights are cold: in January they are colder than in 90% of U.S. towns. Warm coats and heating bills mark the months from October to April, when means dip under 50°.
A year in Suamico at a glance
Each month’s typical high and low, and what it brings.
What stands out about Suamico’s climate
Compared with towns across the U.S., with Suamico’s place in Wisconsin beside it.
What a year in Suamico feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 161 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 9. Frost and day counts come from NOAA’s station at Green Bay, WI, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Suamico’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −15°. 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 50 inches of snow a winter
Snow, measured at Pulaski Wwtp, WI, falls mostly in February 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 117 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Suamico
94% 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 Green Bay, WI.
Living with Suamico’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
161 frost-free days in zone 5b. The last frost comes by Apr 30 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 9.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 44 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Suamico from natural hazards, river flooding is the largest share (60%); heat waves, cold waves, winter storms and ice storms together are 23%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Suamico and its neighbors
Pittsfield has the coldest January nights next door (10°, 3° colder) and Pittsfield the hottest July afternoons (80°, 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 Suamico’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 |
|---|---|---|---|---|
| Suamico, WI | 13° | 78° | 32" | 50" |
| Alpena, MI | 14° | 78° | 31" | 59" |
| Plattsburgh, NY | 9° | 80° | 34" | 50" |
| Duluth, MN | 5° | 76° | 30" | 56" |
| Milton, VT | 10° | 80° | 40" | 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 Suamico averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 86% 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 Suamico compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Suamico’s place among Wisconsin’s.
Suamico weather by month
Highs, lows and precipitation from NOAA’s grid at Suamico’s center; snow, wet days and snow on the ground from Pulaski Wwtp, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 26° | 13° | 1.5" | 10.7" | 9 | 27 | 8° – 31° |
| February | 29° | 15° | 1.2" | 13.7" | 8 | 26 | 10° – 33° |
| March | 39° | 24° | 1.9" | 6.7" | 8 | 18 | 22° – 46° |
| April | 50° | 34° | 3.0" | 4.4" | 11 | 4 | 33° – 48° |
| May | 63° | 44° | 3.4" | 0.0" | 11 | 0 | 47° – 59° |
| June | 73° | 55° | 4.0" | 0.0" | 12 | 0 | 59° – 68° |
| July | 78° | 60° | 3.7" | 0.0" | 10 | 0 | 63° – 74° |
| August | 77° | 59° | 3.4" | 0.0" | 9 | 0 | 63° – 72° |
| September | 70° | 52° | 3.4" | 0.0" | 10 | 0 | 55° – 66° |
| October | 57° | 41° | 2.9" | 0.3" | 12 | 0 | 44° – 55° |
| November | 43° | 30° | 2.1" | 1.7" | 8 | 2 | 28° – 44° |
| December | 31° | 19° | 1.7" | 12.9" | 10 | 17 | 13° – 36° |
| Year | 53° | 37° | 32.3" | 50.4" | 117 | 93 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 22° to 46°. June is the most reliable, staying within 9°.
Where Suamico’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 Suamico’s center.
- Snow: Pulaski Wwtp, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Green Bay, WI, 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 Suamico’s climate
What is the weather like in Suamico?
A typical July afternoon reaches 78°, a January night drops to 13°, and about 50 inches of snow falls in a normal winter. Colder January nights than 90% of U.S. towns; cooler July afternoons than 96% of U.S. towns.
How cold does it get in Suamico in winter?
January nights average 13°. About 152 nights a year reach 32° or below and 19 reach 0° or below. In the coldest January of the last 30 years the month averaged 8°.
How much snow does Suamico get?
About 50 inches in a normal winter at Pulaski Wwtp, WI, most of it in February and December, with snow on the ground about 93 days a year.
How hot does it get in Suamico?
July, with a typical high of 78° and a low of 60°. About 6 days a year reach 90° (Green Bay, WI).
When is the first and last frost in Suamico?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 9, about 161 frost-free days, at Green Bay, WI.
What growing zone is Suamico in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −15°.
What is the best time of year to visit Suamico?
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 Suamico getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 86% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Suamico.
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.