New Boston, IL climate
New Boston has cold winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 15°, and about 20 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in New Boston feels like
Winter
Spring
Summer
Fall
New Boston 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 | 30-yr range |
|---|---|---|---|---|---|---|
| January | 31° | 15° | 1.4" | 6.8" | 6 | 15° – 36° |
| February | 36° | 19° | 1.7" | 3.9" | 6 | 14° – 39° |
| March | 49° | 29° | 2.5" | 3.4" | 7 | 31° – 53° |
| April | 63° | 40° | 3.6" | 0.6" | 9 | 42° – 59° |
| May | 73° | 51° | 4.9" | 0 | 10 | 56° – 69° |
| June | 82° | 61° | 5.0" | 0 | 8 | 69° – 75° |
| July | 85° | 65° | 3.9" | 0 | 7 | 70° – 81° |
| August | 83° | 63° | 3.9" | 0 | 7 | 67° – 78° |
| September | 77° | 54° | 3.5" | 0 | 6 | 60° – 71° |
| October | 64° | 43° | 2.9" | 0 | 5 | 48° – 59° |
| November | 49° | 31° | 2.3" | 0.5" | 6 | 32° – 50° |
| December | 36° | 21° | 1.8" | 5.2" | 6 | 13° – 38° |
| Year | 61° | 41° | 37.3" | 20.4" | 82 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in New Boston
New Boston gets 37 inches of rain and melted snow a year. June is the wettest month and January the driest. Rain or snow falls on about 82 days a year.
About 190 frost-free days a year
In half of years the last 32° night comes by April 14 and the first one by October 24. That leaves about 190 frost-free days for gardens, longer than 64% of U.S. towns.
Heating and cooling a home in New Boston
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In New Boston, 85% of that work is heating and 15% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
New Boston and its neighbors
New Boston borders 1 town with climate data. January nights across them vary by 0.0°. New Boston has both the coldest January nights (15°) and the hottest July afternoons (85°). New Boston’s January low is 15° and its July high 85°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How New Boston compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in New Boston averaged 0.6° warmer than the 1900s. The biggest change is in December (+1.8°). The shift is smaller than in 93% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at New Boston’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 13° to 38°. June is the most reliable, staying within 6°.
Common questions about New Boston’s climate
What is the coldest month in New Boston?
January, with a typical high of 31° and a low of 15°.
What is the hottest month in New Boston?
July, with a typical high of 85° and a low of 65°. About 24 days a year reach 90°.
How much snow does New Boston get?
About 20 inches in a normal winter, most of it in January.
When is the first frost in New Boston?
In half of years the first 32° night comes by October 24, and the last spring frost by April 14.
What is the rainiest month in New Boston?
June, with 5.0 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for New Boston itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Keithsburg, IL (6 mi, snow) and New Boston Dam 17, IL (3 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.