Few U.S. towns have colder winter nights than Crystal Lake
High summer brings afternoon highs near 80°. Precipitation peaks in July and eases off in January. In July, afternoons here are cooler than in 93% of U.S. towns. Seedlings are safe outdoors from about May 5, with the first autumn frost due around October 4.
A year in Crystal Lake at a glance
Each month’s typical high and low, and what it brings.
What stands out about Crystal Lake’s climate
Compared with towns across the U.S., with Crystal Lake’s place in Wisconsin beside it.
What a year in Crystal Lake feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 152 frost-free days a year
In half of years the last 32° night comes by May 5 and the first by October 4. Frost and day counts come from NOAA’s station at Cumberland, WI, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Crystal Lake’s center in zone 4b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −23°. 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 56 inches of snow a winter
Snow, measured at Cumberland, WI, falls mostly in January, February and December. Precipitation (rain plus melted snow) adds up to 33 inches a year; July is the wettest month and January the driest. Rain or snow falls on about 111 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Crystal Lake
96% 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 Cumberland, WI.
Living with Crystal Lake’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
152 frost-free days in zone 4b. 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 4.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 4.6 miles of trails are waiting.
Parks & trails →Cold waves are 45% of the yearly building losses FEMA expects in Crystal Lake from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Crystal Lake and its neighbors
Every town next door is within a degree of Crystal Lake in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Crystal Lake’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 |
|---|---|---|---|---|
| Crystal Lake, WI | 3° | 80° | 33" | 56" |
| Iron Mountain, MI | 5° | 80° | 29" | 61" |
| Peru, NY | 9° | 80° | 35" | 50" |
| Alexandria, MN | 1° | 80° | 27" | 46" |
| Littleton, NH | 6° | 80° | 40" | 68" |
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 Crystal Lake averaged 1.5° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 62% 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 Crystal Lake compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Crystal Lake’s place among Wisconsin’s.
Crystal Lake weather by month
Highs, lows and precipitation from NOAA’s grid at Crystal Lake’s center; snow, wet days and snow on the ground from Cumberland, WI. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 21° | 3° | 0.9" | 11.4" | 9 | 27 | 0° – 25° |
| February | 26° | 6° | 0.9" | 10.6" | 6 | 27 | 4° – 30° |
| March | 39° | 18° | 1.7" | 9.2" | 7 | 20 | 19° – 43° |
| April | 53° | 31° | 2.8" | 4.6" | 10 | 4 | 30° – 50° |
| May | 67° | 43° | 3.9" | 0.4" | 11 | 0 | 49° – 62° |
| June | 76° | 54° | 4.5" | 0.0" | 11 | 0 | 60° – 69° |
| July | 80° | 58° | 4.5" | 0.0" | 10 | 0 | 63° – 74° |
| August | 77° | 56° | 4.3" | 0.0" | 10 | 0 | 61° – 70° |
| September | 69° | 48° | 3.6" | 0.0" | 10 | 0 | 51° – 64° |
| October | 55° | 35° | 3.1" | 0.7" | 10 | 1 | 38° – 51° |
| November | 39° | 23° | 1.8" | 7.1" | 8 | 5 | 22° – 43° |
| December | 26° | 10° | 1.3" | 11.6" | 9 | 21 | 5° – 28° |
| Year | 52° | 32° | 33.3" | 55.6" | 111 | 104 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 4° to 30°. June is the most reliable, staying within 9°.
Where Crystal Lake’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 Crystal Lake’s center.
- Snow: Cumberland, WI.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Cumberland, WI, 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 Crystal Lake’s climate
What is the weather like in Crystal Lake?
A typical July afternoon reaches 80°, a January night drops to 3°, and about 56 inches of snow falls in a normal winter. Colder January nights than all but 104 U.S. towns; cooler July afternoons than 93% of U.S. towns.
How cold does it get in Crystal Lake in winter?
January nights average 3°. About 169 nights a year reach 32° or below and 38 reach 0° or below. In the coldest January of the last 30 years the month averaged 0°.
How much snow does Crystal Lake get?
About 56 inches in a normal winter at Cumberland, WI, most of it in January, February and December, with snow on the ground about 104 days a year.
How hot does it get in Crystal Lake?
July, with a typical high of 80° and a low of 58°. About 4 days a year reach 90° (Cumberland, WI).
When is the first and last frost in Crystal Lake?
In half of years the last spring frost (32°) comes by May 5 and the first fall frost by October 4, about 152 frost-free days, at Cumberland, WI.
What growing zone is Crystal Lake in?
Zone 4b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −23°.
What is the best time of year to visit Crystal Lake?
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 Crystal Lake getting warmer?
Yes: 1991–2020 averaged 1.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 62% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Crystal Lake.
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.