Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Boswell experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 24°F in January while summers reach 72°F in July. The area gets 275 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 40.2 inches. The area receives 17.1 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 753 feet.
Temperature
24°F Jan (-5°C)72°F Jul (22°C)
Annual Average
49.8°F
8% below US avg
January Average
24°F (-5°C)
July Average
72°F (22°C)
Sunny Days
275 days/yr
Geography
Elevation
753 ft (230 m)
Area
0.4 sq mi (0.9 km²)
Population Density
799/sq mi
Coordinates
40.5172°N, 87.3753°W
Timezone
America/Indiana/Indianapolis
County
Benton County County
Nearest Airport
Vermilion Regional (DNV) 25 miles away
Precipitation & Snow
Annual Rainfall40.2"
6% above US avg
Snowfall17.1"
Wettest Month (Jun)4.21"
Driest Month (Feb)1.61"
Air Quality
AQI Median
41.0
Rating
Good
Natural Hazard Risk
Overall Risk
Very Low
Risk Score
4.9 / 100
Social Vulnerability
28.3 / 100
Community Resilience
67.9 / 100
Hazard Breakdown
Tornado
Relatively Low
Hurricane
Very Low
Earthquake
Very Low
Wildfire
Very Low
Flood
Very Low
Hail
Relatively Low
Strong Wind
Relatively Low
Heat Wave
Very Low
Winter Weather
Very Low
Lightning
Very Low
Ice Storm
Very Low
Drought
No Rating
Cold Wave
Relatively Low
Landslide
Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7 earthquakes (M2.5+) recorded within 150 km since 1990.
Strongest on record: M3.8.
Jun 17, 2021
Illinois-Indiana border region
M3.8
77 km
6 km
Dec 20, 1990
5 km S of Stilesville, Indiana
M3.7
121 km
5 km
Apr 14, 2000
4 km NW of Heritage Lake, Indiana
M3.6
100 km
5 km
Nov 4, 2013
1 km SSW of Lyons, Illinois
M3.2
148 km
1 km
Dec 17, 1990
Illinois-Indiana border region
M3.2
57 km
10 km
Dec 16, 1996
3 km NNE of Terre Haute, Indiana
M3.1
113 km
5 km
Mar 15, 2025
6 km W of Dwight, Illinois
M2.6
114 km
5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
613 tornadoes (EF0+) recorded within 100 km since 1950.
Strongest on record: EF4. Total: 87 fatalities, 1,686 injuries.
Date
Rating
Distance
Path
Fatalities
Apr 26, 1994
EF4
36 km
14.0 mi
3
Mar 20, 1976
EF4
32 km
16.7 mi
0
Apr 3, 1974
EF4
21 km
108.7 mi
18
Apr 11, 1965
EF4
70 km
45.7 mi
28
Apr 11, 1965
EF4
85 km
48.0 mi
25
Apr 11, 1965
EF4
51 km
21.8 mi
0
Apr 17, 1963
EF4
96 km
57.3 mi
1
Nov 17, 2013
EF3
50 km
37.9 mi
0
Nov 17, 2013
EF3
74 km
29.8 mi
0
Jun 5, 2010
EF3
69 km
7.8 mi
0
Apr 19, 1996
EF3
89 km
4.0 mi
0
Apr 19, 1996
EF3
66 km
2.0 mi
1
Nov 22, 1992
EF3
97 km
12.0 mi
0
Apr 2, 1982
EF3
78 km
12.0 mi
0
Jun 2, 1980
EF3
55 km
18.1 mi
1
Jun 25, 1978
EF3
36 km
27.4 mi
0
Jul 7, 1977
EF3
94 km
11.6 mi
0
Mar 12, 1976
EF3
60 km
38.5 mi
1
Jun 20, 1974
EF3
85 km
4.5 mi
0
Apr 3, 1974
EF3
94 km
5.9 mi
1
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km.
Highest wave on record: 3.0 m (10 ft).
Year
Location
Cause
Max Wave
Deaths
Distance
1954
MICHIGAN CITY, IN (LAKE MICHIGAN)
Avalanche
3.0 m
7
138 km
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
1 wildfire (100+ acres) recorded within 100 km.
Largest: UNNAMED (1,602 acres, 2000).
Year
Name
Acres Burned
Distance
2000
UNNAMED
1,602
55 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
Month
Avg Temperature
Precipitation
Summary
January
24°F (-5°C)
1.7 in
Coldest
February
27°F (-3°C)
1.6 in
Driest
March
38°F (4°C)
3.0 in
April
50°F (10°C)
3.7 in
May
61°F (16°C)
4.1 in
June
70°F (21°C)
4.2 in
Wettest
July
72°F (22°C)
4.1 in
Warmest
August
72°F (22°C)
3.8 in
September
65°F (18°C)
3.2 in
October
53°F (12°C)
2.9 in
November
41°F (5°C)
3.1 in
December
29°F (-2°C)
2.7 in
Boswell has a seasonal temperature swing of 49°F / from 24°F in January to 72°F in July. Total annual precipitation is 38.0 inches, with June being the wettest month (4.2") and February the driest (1.6").
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