Charles J. Thompson House · Photo: Chuckmor · CC BY-SA 3.0Hardly any U.S. towns see harsher January nights than Forest City
In July the day’s top temperature is typically 82°. Summers stay cool: July afternoons here are cooler than in 83% of U.S. towns. Since 1901–2000, the year has warmed by 0.8°, most of all in December. The heating season runs October to April: each of those months averages under 50°.
A year in Forest City at a glance
Each month’s typical high and low, and what it brings.
What stands out about Forest City’s climate
Compared with towns across the U.S., with Forest City’s place in Iowa beside it.
What a year in Forest City feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 159 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 7. Frost and day counts come from NOAA’s station at Forest City 2 Nne, IA, 1.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Forest City’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −19°. 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 Lake Mills, IA, falls mostly in February and December. Precipitation (rain plus melted snow) adds up to 35 inches a year; June 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 Forest City
93% 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 Forest City 2 Nne, IA.
Living with Forest City’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
159 frost-free days in zone 5a. 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 7.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 2.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Forest City from natural hazards, river flooding is the largest share (51%); heat waves, cold waves, winter storms and ice storms together are 21%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Forest City and similar climates
TownRatings has no climate map of the towns around Forest City yet.
Climates most like Forest City’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 |
|---|---|---|---|---|
| Forest City, IA | 7° | 82° | 35" | 38" |
| Berlin, WI | 9° | 82° | 33" | 38" |
| Isanti, MN | 4° | 82° | 32" | 44" |
| Plattsburgh, NY | 9° | 81° | 35" | 50" |
| Colchester, VT | 10° | 81° | 38" | 50" |
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 Forest City averaged 0.8° warmer than the 1900s. The biggest change is in December (+2.6°).
A smaller shift than in 90% 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 Forest City compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Forest City’s place among Iowa’s.
Forest City weather by month
Highs, lows and precipitation from NOAA’s grid at Forest City’s center; snow, wet days and snow on the ground from Lake Mills, IA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 24° | 7° | 0.8" | 8.2" | 8 | 26 | 4° – 28° |
| February | 28° | 11° | 1.0" | 9.5" | 7 | 24 | 9° – 32° |
| March | 41° | 24° | 1.9" | 5.5" | 8 | 13 | 25° – 48° |
| April | 57° | 35° | 3.7" | 2.8" | 11 | 2 | 35° – 53° |
| May | 69° | 47° | 4.9" | 0.0" | 13 | 0 | 53° – 65° |
| June | 79° | 58° | 5.2" | 0.0" | 12 | 0 | 65° – 73° |
| July | 82° | 61° | 4.4" | 0.0" | 10 | 0 | 65° – 78° |
| August | 79° | 58° | 3.9" | 0.0" | 10 | 0 | 64° – 74° |
| September | 73° | 50° | 3.6" | 0.0" | 9 | 0 | 55° – 67° |
| October | 60° | 37° | 2.5" | 0.3" | 9 | 0 | 42° – 54° |
| November | 43° | 25° | 1.6" | 3.1" | 7 | 4 | 25° – 47° |
| December | 29° | 14° | 1.2" | 8.7" | 8 | 19 | 6° – 29° |
| Year | 55° | 36° | 34.6" | 38.1" | 111 | 87 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 25° to 48°. June is the most reliable, staying within 8°.
Where Forest City’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 Forest City’s center.
- Snow: Lake Mills, IA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Forest City 2 Nne, IA, 1.9 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 Forest City’s climate
What is the weather like in Forest City?
A typical July afternoon reaches 82°, a January night drops to 7°, and about 38 inches of snow falls in a normal winter. Colder January nights than 96% of U.S. towns; cooler July afternoons than 83% of U.S. towns.
How cold does it get in Forest City in winter?
January nights average 7°. About 159 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 4°.
How much snow does Forest City get?
About 38 inches in a normal winter at Lake Mills, IA, most of it in February and December, with snow on the ground about 87 days a year.
How hot does it get in Forest City?
July, with a typical high of 82° and a low of 61°. About 9 days a year reach 90° (Forest City 2 Nne, IA).
When is the first and last frost in Forest City?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 7, about 159 frost-free days, at Forest City 2 Nne, IA.
What growing zone is Forest City in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −19°.
What is the best time of year to visit Forest City?
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 Forest City getting warmer?
Yes: 1991–2020 averaged 0.8° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 90% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Forest City.
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.