Vienna, IL climate
Vienna has chilly winters and warm summers, with plenty of rain. A typical July afternoon reaches 88°, a January night drops to 26°, and about 7 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Vienna feels like
Winter
Spring
Summer
Fall
Vienna 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 | 43° | 26° | 3.6" | 1.7" | 8 | 28° – 43° |
| February | 48° | 29° | 3.5" | 3.2" | 8 | 27° – 47° |
| March | 58° | 37° | 4.7" | 0.6" | 9 | 40° – 61° |
| April | 69° | 46° | 5.3" | 0 | 10 | 51° – 63° |
| May | 77° | 56° | 5.1" | 0 | 10 | 62° – 73° |
| June | 86° | 65° | 4.4" | 0 | 8 | 70° – 79° |
| July | 88° | 68° | 4.3" | 0 | 8 | 73° – 84° |
| August | 88° | 66° | 3.1" | 0 | 6 | 72° – 83° |
| September | 82° | 58° | 3.4" | 0 | 6 | 66° – 76° |
| October | 70° | 47° | 3.9" | 0.3" | 7 | 54° – 64° |
| November | 57° | 37° | 4.4" | 0 | 8 | 40° – 53° |
| December | 46° | 29° | 4.0" | 1.4" | 9 | 25° – 47° |
| Year | 68° | 47° | 49.7" | 7.2" | 98 |
“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 Vienna
Vienna gets 50 inches of rain and melted snow a year. April is the wettest month and August the driest. Rain or snow falls on about 98 days a year.
About 189 frost-free days a year
In half of years the last 32° night comes by April 14 and the first one by October 21. That leaves about 189 frost-free days for gardens, longer than 63% of U.S. towns.
Heating and cooling a home in Vienna
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Vienna, 75% of that work is heating and 25% is cooling.
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.
How Vienna 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 Vienna averaged 1.0° warmer than the 1900s. The biggest change is in December (+1.9°). The shift is smaller than in 71% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Vienna’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 25° to 47°. October is the most reliable, staying within 9°.
Common questions about Vienna’s climate
What is the coldest month in Vienna?
January, with a typical high of 43° and a low of 26°.
What is the hottest month in Vienna?
July, with a typical high of 88° and a low of 68°. About 47 days a year reach 90°.
How much snow does Vienna get?
About 7 inches in a normal winter, most of it in February.
When is the first frost in Vienna?
In half of years the first 32° night comes by October 21, and the last spring frost by April 14.
What is the rainiest month in Vienna?
April, with 5.3 inches of rain and melted snow. The year totals 50 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Vienna itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Dixon Springs Agric Ctr, IL (12 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.