Allen has chilly, snowy winters and pleasant summers
A typical July afternoon reaches 83°, a January night drops to 17°, and about 36 inches of snow falls in a normal winter.
A year in Allen at a glance
Each month’s typical high and low, and what it brings.
What stands out about Allen’s climate
Read from where Allen sits among Indiana’s towns. The page puts what stands out first.
Living with Allen’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
159 frost-free days. 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 10.
About 36" a winter over 12 days with an inch or more, most in January. Snow covers the ground about 39 days a year.
Months averaging under 55° run from October through April. Heating is 92% of the year’s heating-and-cooling load.
About 11 days a year reach 90°, and July afternoons average 83°.
The nicest months are May, June, July, August, September and October. 8.3 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →What a year in Allen 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 May 2 and the first by October 10.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
36 inches of snow, 38 of rain and melt
May is the wettest month and February the driest. Rain or snow falls on about 119 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Allen and its neighbors
Wayne has the coldest January nights next door (17°) and Swan the hottest July afternoons (83°). Tap a town to see its climate.
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 Allen averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.5°).
A smaller shift than in 56% of U.S. towns.
Change by month
How Allen compares
Against every U.S. town on TownTapestry, each counted once, with its place in Indiana.
Allen weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 31° | 17° | 2.4" | 10.6" | 12 | 15 | 14° – 36° |
| February | 35° | 19° | 2.0" | 9.7" | 10 | 12 | 14° – 37° |
| March | 47° | 27° | 2.3" | 4.8" | 10 | 4 | 27° – 52° |
| April | 60° | 38° | 3.7" | 1.2" | 12 | 0 | 41° – 54° |
| May | 71° | 48° | 4.5" | 0 | 12 | 0 | 53° – 66° |
| June | 80° | 58° | 4.0" | 0 | 10 | 0 | 64° – 72° |
| July | 83° | 61° | 3.8" | 0 | 9 | 0 | 67° – 78° |
| August | 81° | 60° | 3.9" | 0 | 9 | 0 | 66° – 76° |
| September | 75° | 52° | 3.0" | 0 | 8 | 0 | 59° – 67° |
| October | 63° | 42° | 3.0" | 0.1" | 9 | 0 | 48° – 59° |
| November | 48° | 31° | 3.1" | 2.5" | 10 | 1 | 33° – 46° |
| December | 36° | 22° | 2.5" | 7.1" | 11 | 8 | 16° – 40° |
| Year | 59° | 40° | 38.2" | 36.0" | 119 | 39 |
Heating and cooling a home in Allen
92% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 27° to 52°. September is the most reliable, staying within 8°.
Common questions about Allen’s climate
What is the coldest month in Allen?
January, with a typical high of 31° and a low of 17°.
What is the hottest month in Allen?
July, with a typical high of 83° and a low of 61°. About 11 days a year reach 90°.
How much snow does Allen get?
About 36 inches in a normal winter, most of it in January.
When is the first frost in Allen?
In half of years the first 32° night comes by October 10, and the last spring frost by May 2.
What is the rainiest month in Allen?
May, with 4.5 inches of rain and melted snow. The year totals 38 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Allen.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Allen itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Garrett 1 S, IN (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.