Bloomfield has colder winter nights than 88% of U.S. towns
On a normal July day the thermometer tops out near 83°. It is a dry place: less rain and snow fall here than on 73% of U.S. towns. The latest 30-year average runs 1.0° warmer than 1901–2000’s, with December up the most. Seedlings are safe outdoors from about April 25, with the first autumn frost due around October 21.
A year in Bloomfield at a glance
Each month’s typical high and low, and what it brings.
What stands out about Bloomfield’s climate
Compared with towns across the U.S., with Bloomfield’s place in Wisconsin beside it.
What a year in Bloomfield feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 179 frost-free days a year
In half of years the last 32° night comes by April 25 and the first by October 21. Frost and day counts come from NOAA’s station at Lake Geneva Wwtp, WI, 2.2 miles from the town’s center, at about the same height.
The 2023 USDA map puts Bloomfield’s center in zone 5b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −12°. 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 38 inches of snow a winter
Snow, measured at Burlington, WI, falls mostly in January. Precipitation (rain plus melted snow) adds up to 37 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 116 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Bloomfield
88% 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 Lake Geneva Wwtp, WI.
Living with Bloomfield’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
179 frost-free days in zone 5b. The last frost comes by Apr 25 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 21.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 0.9 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Bloomfield from natural hazards, river flooding is the largest share (41%); heat waves, cold waves, winter storms and ice storms together are 26%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Bloomfield and its neighbors
Every town next door is within a degree of Bloomfield in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Bloomfield’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 |
|---|---|---|---|---|
| Bloomfield, WI | 14° | 83° | 37" | 38" |
| Elmira, NY | 16° | 83° | 36" | 42" |
| Boone, IA | 11° | 84° | 36" | 36" |
| Charlotte, MI | 17° | 82° | 36" | 38" |
| Kendallville, IN | 17° | 83° | 38" | 36" |
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 Bloomfield averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 75% 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 Bloomfield compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Bloomfield’s place among Wisconsin’s.
Bloomfield weather by month
Highs, lows and precipitation from NOAA’s grid at Bloomfield’s center; snow, wet days and snow on the ground from Burlington, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 29° | 14° | 1.7" | 12.1" | 9 | 20 | 11° – 33° |
| February | 33° | 17° | 1.7" | 9.7" | 8 | 17 | 13° – 36° |
| March | 45° | 26° | 2.2" | 4.9" | 9 | 7 | 26° – 50° |
| April | 57° | 36° | 3.7" | 1.1" | 12 | 1 | 38° – 52° |
| May | 69° | 47° | 4.2" | 0.0" | 12 | 0 | 52° – 64° |
| June | 79° | 56° | 4.7" | 0.0" | 11 | 0 | 64° – 72° |
| July | 83° | 61° | 3.6" | 0.0" | 9 | 0 | 66° – 78° |
| August | 81° | 60° | 3.8" | 0.0" | 10 | 0 | 65° – 76° |
| September | 74° | 52° | 3.5" | 0.0" | 9 | 0 | 57° – 68° |
| October | 61° | 40° | 3.0" | 0.0" | 10 | 0 | 46° – 57° |
| November | 46° | 30° | 2.4" | 2.2" | 9 | 2 | 30° – 47° |
| December | 34° | 20° | 2.0" | 7.7" | 9 | 12 | 14° – 38° |
| Year | 58° | 38° | 36.5" | 37.7" | 116 | 57 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 26° to 50°. June is the most reliable, staying within 8°.
Where Bloomfield’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 Bloomfield’s center.
- Snow: Burlington, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Lake Geneva Wwtp, WI, 2.2 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 Bloomfield’s climate
What is the weather like in Bloomfield?
A typical July afternoon reaches 83°, a January night drops to 14°, and about 38 inches of snow falls in a normal winter. Colder January nights than 88% of U.S. towns; cooler July afternoons than 72% of U.S. towns.
How cold does it get in Bloomfield in winter?
January nights average 14°. About 136 nights a year reach 32° or below and 9 reach 0° or below. In the coldest January of the last 30 years the month averaged 11°.
How much snow does Bloomfield get?
About 38 inches in a normal winter at Burlington, WI, most of it in January, with snow on the ground about 57 days a year.
How hot does it get in Bloomfield?
July, with a typical high of 83° and a low of 61°. About 21 days a year reach 90° (Lake Geneva Wwtp, WI).
When is the first and last frost in Bloomfield?
In half of years the last spring frost (32°) comes by April 25 and the first fall frost by October 21, about 179 frost-free days, at Lake Geneva Wwtp, WI.
What growing zone is Bloomfield in?
Zone 5b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −12°.
What is the best time of year to visit Bloomfield?
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 Bloomfield getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 75% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Bloomfield.
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.