Bull Valley, IL climate
Bull Valley has cold, snowy winters and pleasant summers. A typical July afternoon reaches 83°, a January night drops to 14°, and about 35 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeRight about normal today. The forecast high is 68°, and a typical Oct 1 in Bull Valley peaks around 68°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Bull Valley feels like
Winter
Spring
Summer
Fall
Bull Valley 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 | 29° | 14° | 1.7" | 11.0" | 10 | 20 | 11° – 33° |
| February | 34° | 17° | 1.7" | 8.9" | 8 | 16 | 12° – 37° |
| March | 45° | 26° | 2.2" | 3.9" | 9 | 6 | 26° – 51° |
| April | 58° | 36° | 3.8" | 1.0" | 11 | 1 | 39° – 53° |
| May | 70° | 47° | 4.5" | 0 | 13 | 0 | 53° – 64° |
| June | 79° | 57° | 4.7" | 0 | 12 | 0 | 65° – 73° |
| July | 83° | 62° | 3.8" | 0 | 10 | 0 | 67° – 79° |
| August | 81° | 60° | 3.9" | 0 | 10 | 0 | 65° – 76° |
| September | 74° | 52° | 3.5" | 0 | 9 | 0 | 58° – 68° |
| October | 62° | 40° | 3.1" | 0.1" | 10 | 0 | 47° – 57° |
| November | 47° | 30° | 2.4" | 1.4" | 8 | 2 | 30° – 47° |
| December | 34° | 20° | 2.0" | 8.2" | 9 | 11 | 14° – 38° |
| Year | 58° | 38° | 37.3" | 34.5" | 119 | 55 |
“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 Bull Valley
Bull Valley gets 37 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 119 days a year. Snow covers the ground about 55 days of the year.
About 162 frost-free days a year
In half of years the last 32° night comes by May 1 and the first one by October 11. That leaves about 162 frost-free days for gardens, shorter than 69% of U.S. towns.
Heating and cooling a home in Bull Valley
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Bull Valley, 90% of that work is heating and 10% 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.
Bull Valley and its neighbors
Bull Valley borders 5 towns with climate data. January nights across them vary by 0.6°. Woodstock has the coldest January nights (14°) and McHenry the hottest July afternoons (83°). Bull Valley’s January low is 14° and its July high 83°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Bull Valley 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 Bull Valley averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.5°). The shift is smaller than in 60% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Bull Valley’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 12° to 37°. June is the most reliable, staying within 8°.
Common questions about Bull Valley’s climate
What is the coldest month in Bull Valley?
January, with a typical high of 29° and a low of 14°.
What is the hottest month in Bull Valley?
July, with a typical high of 83° and a low of 62°. About 11 days a year reach 90°.
How much snow does Bull Valley get?
About 35 inches in a normal winter, most of it in January.
When is the first frost in Bull Valley?
In half of years the first 32° night comes by October 11, and the last spring frost by May 1.
What is the rainiest month in Bull Valley?
June, with 4.7 inches of rain and melted snow. The year totals 37 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Bull Valley itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mc Henry -wg Stratton L&d, IL (6 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.