Hardly any U.S. towns see harsher January nights than Jackson Junction
Sunny July days climb to about 82°. By July afternoons alone, it runs cooler than 83% of U.S. towns. Decade by decade the climate has edged up, 0.9° above 1901–2000. Warm coats and heating bills mark the months from October to April, when means dip under 50°.
A year in Jackson Junction at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jackson Junction’s climate
Compared with towns across the U.S., with Jackson Junction’s place in Iowa beside it.
What a year in Jackson Junction feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 155 frost-free days a year
In half of years the last 32° night comes by May 2 and the first by October 5. Frost and day counts come from NOAA’s station at New Hampton, IA, 14 miles from the town’s center, at about the same height.
The 2023 USDA map puts Jackson Junction’s center in zone 5a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −20°. 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 39 inches of snow a winter
Snow, measured at New Hampton, IA, is heaviest from January through February, about 10 inches a month. Precipitation (rain plus melted snow) adds up to 38 inches a year; June is the wettest month and January the driest. Rain or snow falls on about 91 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Jackson Junction
94% 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 New Hampton, IA.
Living with Jackson Junction’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
155 frost-free days in zone 5a. The last frost comes by May 2 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 5.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Jackson Junction from natural hazards, river flooding is the largest share (55%); heat waves, cold waves, winter storms and ice storms together are 10%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Jackson Junction and similar climates
TownRatings has no climate map of the towns around Jackson Junction yet.
Climates most like Jackson Junction’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 |
|---|---|---|---|---|
| Jackson Junction, IA | 8° | 82° | 38" | 39" |
| Beaver Dam, WI | 10° | 82° | 35" | 43" |
| Colchester, VT | 10° | 81° | 38" | 50" |
| Plattsburgh, NY | 9° | 81° | 35" | 50" |
| Mounds View, MN | 6° | 82° | 32" | 40" |
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 Jackson Junction averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.9°).
A smaller shift than in 83% 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 Jackson Junction compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jackson Junction’s place among Iowa’s.
Jackson Junction weather by month
Highs, lows and precipitation from NOAA’s grid at Jackson Junction’s center; snow, wet days and snow on the ground from New Hampton, IA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 24° | 8° | 1.1" | 9.7" | 6 | 21 | 6° – 30° |
| February | 29° | 11° | 1.1" | 10.3" | 6 | 22 | 7° – 32° |
| March | 42° | 23° | 2.0" | 6.2" | 7 | 9 | 24° – 49° |
| April | 57° | 34° | 3.9" | 1.4" | 9 | 1 | 35° – 52° |
| May | 69° | 46° | 4.8" | 0.0" | 11 | 0 | 52° – 65° |
| June | 79° | 57° | 6.0" | 0.0" | 10 | 0 | 64° – 72° |
| July | 82° | 60° | 4.9" | 0.0" | 8 | 0 | 65° – 78° |
| August | 80° | 58° | 4.2" | 0.0" | 8 | 0 | 63° – 74° |
| September | 73° | 50° | 3.9" | 0.0" | 8 | 0 | 55° – 67° |
| October | 60° | 37° | 2.7" | 0.1" | 7 | 0 | 43° – 54° |
| November | 43° | 26° | 1.9" | 2.9" | 5 | 3 | 26° – 46° |
| December | 30° | 14° | 1.4" | 7.9" | 6 | 13 | 7° – 33° |
| Year | 56° | 35° | 37.8" | 38.5" | 91 | 69 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 7° to 33°. June is the most reliable, staying within 8°.
Where Jackson Junction’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 Jackson Junction’s center.
- Snow: New Hampton, IA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: New Hampton, IA, 14 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 Jackson Junction’s climate
What is the weather like in Jackson Junction?
A typical July afternoon reaches 82°, a January night drops to 8°, and about 39 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 Jackson Junction in winter?
January nights average 8°. About 158 nights a year reach 32° or below and 23 reach 0° or below. In the coldest January of the last 30 years the month averaged 6°.
How much snow does Jackson Junction get?
About 39 inches in a normal winter at New Hampton, IA, heaviest from January through February, about 10 inches a month, with snow on the ground about 69 days a year.
How hot does it get in Jackson Junction?
July, with a typical high of 82° and a low of 60°. About 8 days a year reach 90° (New Hampton, IA).
When is the first and last frost in Jackson Junction?
In half of years the last spring frost (32°) comes by May 2 and the first fall frost by October 5, about 155 frost-free days, at New Hampton, IA.
What growing zone is Jackson Junction in?
Zone 5a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −20°.
What is the best time of year to visit Jackson Junction?
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 Jackson Junction getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 83% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jackson Junction.
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.