Proviso has chilly, snowy winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 17°, and about 42 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normalsUpdated once a decade
☀️
July high
84°
757th coolest of 2,886 Illinois towns
❄️
January low
17°
1340th coldest of 2,886 Illinois towns
💧
Rain + melted snow
38 in
679th driest of 2,886 Illinois towns
🌨️
Snow a winter
42 in
54th snowiest of 2,880 Illinois towns
A normal year
What a year in Proviso feels like
❄️
Winter
35° / 20°
Typical high / low · 12 days with an inch or more of snow
🌷
Spring
59° / 39°
Typical high / low · Last frost around Apr 16
☀️
Summer
82° / 62°
Typical high / low · 17 days reach 90° in a normal year
🍂
Fall
62° / 44°
Typical high / low · First frost around Oct 28
0°
10°
20°
40°
50°
60°
70°
80°
90°
100°
32°
32°
17°
36°
20°
47°
29°
59°
39°
71°
49°
80°
59°
84°
64°
82°
63°
76°
55°
63°
43°
49°
32°
37°
23°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
32°, freezingBar runs from the typical overnight low up to the afternoon high
Best months to be outsideMayJunAugSepOctHighs of 62–84° and lows of 40° or more
Month by month
Proviso 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
32°
17°
2.0"
12.6"
11
17
16° – 36°
February
36°
20°
1.8"
14.5"
10
18
16° – 39°
March
47°
29°
2.4"
4.1"
12
6
31° – 53°
April
59°
39°
3.8"
0.8"
12
1
41° – 55°
May
71°
49°
4.6"
0
13
0
54° – 66°
June
80°
59°
4.4"
0
13
0
66° – 74°
July
84°
64°
3.7"
0
10
0
69° – 81°
August
82°
63°
4.0"
0
10
0
67° – 79°
September
76°
55°
3.3"
0
9
0
59° – 70°
October
63°
43°
3.5"
0
11
0
49° – 59°
November
49°
32°
2.5"
0.6"
9
0
33° – 49°
December
37°
23°
2.1"
9.7"
13
14
17° – 40°
Year
60°
41°
38.1"
42.3"
133
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 & snow
Rain and snow in Proviso
Proviso gets 38 inches of rain and melted snow a year. May is the wettest month and February the driest. Rain or snow falls on about 133 days a year. Snow covers the ground about 55 days of the year.
💧
38 in
Rain + melted snow a year
Less rain than 56% of U.S. towns
❄️
42 in
Snow in a normal winter
More snow than 73% of U.S. towns
⛄
55 days
With 1"+ of snow on the ground
More than 68% of U.S. towns
Rain + melted snow by month
Inches of water
4.6"
JFMAMJJASOND
Snowfall by month
Inches of snow
15"
JFMAMJJASOND
Frost & the growing season
About 193 frost-free days a year
In half of years the last 32° night comes by April 16 and the first one by October 28. That leaves about 193 frost-free days for gardens, longer than 67% of U.S. towns.
🌱 Apr 16
🍂 Oct 28
193 frost-free days
JFMAMJJASOND
🥶
121
nights at or below 32° in a normal year
🧊
7
nights below 0° in a normal year
🔥
17
days that reach 90° in a normal year
Freezing nights by month
Average nights at or below 32°
JFMAMJJASOND
90° days by month
Average days at 90° or more
JFMAMJJASOND
Heating & cooling
Heating and cooling a home in Proviso
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Proviso, 86% of that work is heating and 14% is cooling, so the furnace matters far more than the air conditioner.
🔥
5,974 heating degree daysMore heating than 55% of U.S. towns
❄️
1,003 cooling degree daysMore cooling than 60% of U.S. towns
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.
Around Proviso
Proviso and its neighbors
Proviso borders 12 towns with climate data. January nights across them vary by 1.1°. York has the coldest January nights (16°) and Lyons the hottest July afternoons (84°). Proviso’s January low is 17° and its July high 84°.
Compared with every U.S. town and city on TownTapestry, each counted once.
Then and now
Warmer than it used to be
+1.4°1991–2020 average vs. the 20th century (1901–2000)
The last 30 years in Proviso averaged 1.4° warmer than the 1900s. The biggest change is in December (+2.6°). The shift is larger than in 67% of U.S. towns.
❄️ Winter+2.2°now 27°, was 25°
🌷 Spring+1.4°now 49°, was 48°
☀️ Summer+1.0°now 72°, was 71°
🍂 Fall+1.1°now 53°, was 52°
Change by month1991–2020 average minus 1901–2000 average, at Proviso’s spot on NOAA’s grid
+0.5°
+2.6°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Year to year
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 16° to 39°. June is the most reliable, staying within 9°.
10°
20°
30°
40°
50°
60°
70°
80°
90°
JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD
Coldest to warmest month in 30 yearsNormal
Questions
Common questions about Proviso’s climate
What is the coldest month in Proviso?
January, with a typical high of 32° and a low of 17°.
What is the hottest month in Proviso?
July, with a typical high of 84° and a low of 64°. About 17 days a year reach 90°.
How much snow does Proviso get?
About 42 inches in a normal winter, most of it in February.
When is the first frost in Proviso?
In half of years the first 32° night comes by October 28, and the last spring frost by April 16.
What is the rainiest month in Proviso?
May, with 4.6 inches of rain and melted snow. The year totals 38 inches.
📍Temperatures and rainfall come from NOAA’s gridded climate normals for Proviso itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Oak Brook 2w, IL (5 mi, snow) and Chicago Ohare Intl Airport, IL (10 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.