Photo: Dennisyerger84 · CC BY-SA 4.0Portage’s winters are colder and snowier than most of the U.S.
A typical July afternoon reaches 83°, a January night drops to 19°, and about 40 inches of snow falls in a normal winter.
A year in Portage at a glance
Each month’s typical high and low, and what it brings.
What stands out about Portage’s climate
Compared with towns across the U.S., with Portage’s place in Indiana beside it.
What a year in Portage feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 188 frost-free days a year
In half of years the last 32° night comes by April 22 and the first by October 27. Frost and day counts come from NOAA’s station at Indiana Dunes Nl, IN, 6 miles from the town’s center, at about the same height.
The 2023 USDA map puts Portage’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −7°. 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 40 inches of snow a winter
Snow, measured at Indiana Dunes Nl, IN, falls mostly in January. Precipitation (rain plus melted snow) adds up to 38 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 131 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Portage
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 Indiana Dunes Nl, IN.
Living with Portage’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
188 frost-free days in zone 6a. The last frost comes by Apr 22 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 27.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October. 27 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Portage from natural hazards, river flooding is the largest share (44%); heat waves, cold waves, winter storms and ice storms together are 24%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Portage and its neighbors
Portage Township has the coldest January nights next door (17°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Portage’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 |
|---|---|---|---|---|
| Portage, IN | 19° | 83° | 38" | 40" |
| Stow, OH | 20° | 83° | 40" | 45" |
| Taylor, PA | 18° | 83° | 40" | 45" |
| Elmira, NY | 16° | 83° | 36" | 42" |
| St. Clair, MI | 18° | 82° | 35" | 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 Portage averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 63% 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 Portage compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Portage’s place among Indiana’s.
Portage weather by month
Highs, lows and precipitation from NOAA’s grid at Portage’s center; snow, wet days and snow on the ground from Indiana Dunes Nl, IN. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 33° | 19° | 2.2" | 16.0" | 13 | 17 | 16° – 37° |
| February | 36° | 21° | 2.0" | 9.7" | 9 | 13 | 17° – 39° |
| March | 47° | 30° | 2.3" | 6.0" | 11 | 5 | 29° – 53° |
| April | 59° | 39° | 3.5" | 0.6" | 11 | 0 | 40° – 54° |
| May | 70° | 49° | 4.3" | 0.0" | 12 | 0 | 53° – 66° |
| June | 79° | 59° | 4.2" | 0.0" | 12 | 0 | 64° – 74° |
| July | 83° | 64° | 3.8" | 0.0" | 10 | 0 | 68° – 79° |
| August | 81° | 63° | 4.0" | 0.0" | 10 | 0 | 67° – 78° |
| September | 75° | 56° | 3.5" | 0.0" | 10 | 0 | 60° – 70° |
| October | 63° | 45° | 3.5" | 0.0" | 12 | 0 | 50° – 60° |
| November | 49° | 34° | 2.7" | 0.7" | 11 | 1 | 34° – 49° |
| December | 37° | 24° | 2.2" | 7.3" | 12 | 10 | 18° – 41° |
| Year | 59° | 42° | 38.2" | 40.3" | 131 | 46 |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 29° to 53°. June is the most reliable, staying within 10°.
Where Portage’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 Portage’s center.
- Snow: Indiana Dunes Nl, IN.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Indiana Dunes Nl, IN, 6 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 Portage’s climate
What is the weather like in Portage?
A typical July afternoon reaches 83°, a January night drops to 19°, and about 40 inches of snow falls in a normal winter. Colder January nights than 67% of U.S. towns; cooler July afternoons than 75% of U.S. towns.
How cold does it get in Portage in winter?
January nights average 19°. About 117 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 16°.
How much snow does Portage get?
About 40 inches in a normal winter at Indiana Dunes Nl, IN, most of it in January, with snow on the ground about 46 days a year.
How hot does it get in Portage?
July, with a typical high of 83° and a low of 64°. About 11 days a year reach 90° (Indiana Dunes Nl, IN).
When is the first and last frost in Portage?
In half of years the last spring frost (32°) comes by April 22 and the first fall frost by October 27, about 188 frost-free days, at Indiana Dunes Nl, IN.
What growing zone is Portage in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −7°.
What is the best time of year to visit Portage?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Portage getting warmer?
Yes: 1991–2020 averaged 1.2° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 63% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Portage.
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.