Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Delphi experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 27°F in January while summers reach 74°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 39.0 inches. The area receives 17.2 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 618 feet.
Temperature
27°F Jan (-3°C)74°F Jul (23°C)
Annual Average
52.2°F
3% below US avg
January Average
27°F (-3°C)
July Average
74°F (23°C)
Sunny Days
275 days/yr
Geography
Elevation
618 ft (188 m)
Area
2.7 sq mi (7.1 km²)
Population Density
1,071/sq mi
Coordinates
40.5834°N, 86.6668°W
Timezone
America/Indiana/Indianapolis
County
Carroll County County
Nearest Airport
Vermilion Regional (DNV) 56 miles away
Precipitation & Snow
Annual Rainfall39.0"
3% above US avg
Snowfall17.2"
Wettest Month (Jun)3.98"
Driest Month (Feb)1.73"
Air Quality
AQI Median
41.0
Rating
Good
Natural Hazard Risk
Overall Risk
Very Low
Risk Score
29.6 / 100
Social Vulnerability
13.4 / 100
Community Resilience
67.4 / 100
Hazard Breakdown
Tornado
Relatively Low
Hurricane
Very Low
Earthquake
Very Low
Wildfire
Very Low
Flood
Relatively Low
Hail
Relatively Low
Strong Wind
Relatively Low
Heat Wave
Very Low
Winter Weather
Relatively Low
Lightning
Very Low
Ice Storm
Very Low
Drought
Relatively Low
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
99 km
6 km
Sep 12, 2004
4 km NW of Manilla, Indiana
M3.8
138 km
2 km
Dec 20, 1990
5 km S of Stilesville, Indiana
M3.7
111 km
5 km
Apr 14, 2000
4 km NW of Heritage Lake, Indiana
M3.6
92 km
5 km
Dec 17, 1990
Illinois-Indiana border region
M3.2
66 km
10 km
Dec 16, 1996
3 km NNE of Terre Haute, Indiana
M3.1
136 km
5 km
Jan 26, 2012
5 km NE of Topeka, Indiana
M3.0
148 km
5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
595 tornadoes (EF0+) recorded within 100 km since 1950.
Strongest on record: EF4. Total: 95 fatalities, 1,810 injuries.
Date
Rating
Distance
Path
Fatalities
Apr 26, 1994
EF4
27 km
14.0 mi
3
Mar 20, 1976
EF4
31 km
16.7 mi
0
Apr 3, 1974
EF4
40 km
108.7 mi
18
Apr 11, 1965
EF4
32 km
48.0 mi
25
Apr 11, 1965
EF4
31 km
21.8 mi
0
Apr 11, 1965
EF4
65 km
45.7 mi
28
Mar 6, 1956
EF4
93 km
1.9 mi
1
Mar 31, 2023
EF3
92 km
6.4 mi
0
May 27, 2019
EF3
63 km
13.7 mi
0
Aug 24, 2016
EF3
43 km
8.6 mi
0
Nov 17, 2013
EF3
30 km
37.9 mi
0
Jun 5, 2010
EF3
41 km
7.5 mi
0
Oct 18, 2007
EF3
90 km
20.3 mi
0
May 30, 2004
EF3
48 km
4.5 mi
0
Jun 11, 1998
EF3
54 km
18.5 mi
0
Nov 22, 1992
EF3
92 km
9.0 mi
0
Nov 22, 1992
EF3
98 km
12.0 mi
0
Jun 2, 1980
EF3
66 km
18.1 mi
1
Jun 25, 1978
EF3
99 km
1.0 mi
0
Jun 25, 1978
EF3
31 km
27.4 mi
0
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
126 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
88 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
Month
Avg Temperature
Precipitation
Summary
January
27°F (-3°C)
1.9 in
Coldest
February
28°F (-2°C)
1.7 in
Driest
March
39°F (4°C)
2.8 in
April
50°F (10°C)
3.6 in
May
61°F (16°C)
3.9 in
June
70°F (21°C)
4.0 in
Wettest
July
74°F (23°C)
3.9 in
Warmest
August
72°F (22°C)
3.9 in
September
65°F (18°C)
3.1 in
October
53°F (12°C)
2.6 in
November
41°F (5°C)
3.0 in
December
30°F (-1°C)
2.8 in
Delphi has a seasonal temperature swing of 47°F / from 27°F in January to 74°F in July. Total annual precipitation is 37.2 inches, with June being the wettest month (4.0") and February the driest (1.7").
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