Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hartz Lake experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 24°F in January while summers reach 73°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 40.3 inches. The area receives 54.9 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 720 feet.
Temperature
24°F Jan (-4°C)73°F Jul (23°C)
Annual Average
50.0°F
7% below US avg
January Average
24°F (-4°C)
July Average
73°F (23°C)
Sunny Days
275 days/yr
Geography
Elevation
720 ft (219 m)
Area
0.4 sq mi (1.1 km²)
Population Density
693/sq mi
Coordinates
41.1779°N, 86.4980°W
Timezone
America/Indiana/Indianapolis
County
Starke County County
Nearest Airport
Porter County Regional (VPZ) 33 miles away
Precipitation & Snow
Annual Rainfall40.3"
6% above US avg
Snowfall54.9"
Wettest Month (Jun)4.25"
Driest Month (Feb)1.73"
Air Quality
AQI Median
41.0
Rating
Good
Natural Hazard Risk
Overall Risk
Very Low
Risk Score
24.9 / 100
Social Vulnerability
41.3 / 100
Community Resilience
73.5 / 100
Hazard Breakdown
Tornado
Relatively Low
Hurricane
Very Low
Earthquake
Very Low
Wildfire
Very Low
Flood
Very Low
Hail
Very Low
Strong Wind
Relatively Moderate
Heat Wave
Very Low
Winter Weather
Relatively Low
Lightning
Relatively Low
Ice Storm
Very Low
Drought
No Rating
Cold Wave
Relatively Moderate
Landslide
Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990.
Strongest on record: M4.2.
May 2, 2015
5 km S of Galesburg, Michigan
M4.2
147 km
4 km
Nov 4, 2013
1 km SSW of Lyons, Illinois
M3.2
130 km
1 km
Dec 17, 1990
Illinois-Indiana border region
M3.2
132 km
10 km
Jan 26, 2012
5 km NE of Topeka, Indiana
M3.0
95 km
5 km
Jun 12, 2015
6 km NW of Convoy, Ohio
M2.6
148 km
5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
567 tornadoes (EF0+) recorded within 100 km since 1950.
Strongest on record: EF4. Total: 138 fatalities, 2,339 injuries.
Date
Rating
Distance
Path
Fatalities
Apr 26, 1994
EF4
86 km
14.0 mi
3
Mar 20, 1976
EF4
89 km
16.7 mi
0
Apr 3, 1974
EF4
92 km
108.7 mi
18
Apr 11, 1965
EF4
83 km
21.6 mi
5
Apr 11, 1965
EF4
51 km
37.0 mi
36
Apr 11, 1965
EF4
87 km
48.0 mi
25
Apr 11, 1965
EF4
98 km
21.8 mi
0
Apr 11, 1965
EF4
52 km
21.2 mi
31
May 27, 2019
EF3
38 km
13.7 mi
0
Aug 24, 2016
EF3
84 km
8.6 mi
0
Nov 17, 2013
EF3
97 km
37.9 mi
0
Jun 5, 2010
EF3
66 km
7.5 mi
0
Oct 18, 2007
EF3
31 km
20.3 mi
0
May 30, 2004
EF3
59 km
4.5 mi
0
Oct 24, 2001
EF3
50 km
47.0 mi
1
Jun 11, 1998
EF3
94 km
18.5 mi
0
Jun 25, 1978
EF3
92 km
27.4 mi
0
Jul 7, 1977
EF3
83 km
11.6 mi
0
Mar 12, 1976
EF3
17 km
12.1 mi
0
Mar 12, 1976
EF3
70 km
12.6 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
66 km
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
4 wildfires (100+ acres) recorded within 100 km.
Largest: UNNAMED (1,602 acres, 2000).
Year
Name
Acres Burned
Distance
2000
UNNAMED
1,602
92 km
1986
OGDEN DUNS
863
77 km
2021
21-INDU TOLLESTON DUNES EAST
594
76 km
2017
17 INDU COWLES DUNES
522
73 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
Month
Avg Temperature
Precipitation
Summary
January
24°F (-4°C)
1.9 in
Coldest
February
27°F (-3°C)
1.7 in
Driest
March
38°F (3°C)
2.8 in
April
49°F (9°C)
3.8 in
May
60°F (16°C)
3.8 in
June
69°F (21°C)
4.3 in
Wettest
July
73°F (23°C)
3.9 in
Warmest
August
71°F (22°C)
3.6 in
September
64°F (18°C)
3.7 in
October
52°F (11°C)
3.0 in
November
40°F (5°C)
3.2 in
December
29°F (-2°C)
2.8 in
Hartz Lake has a seasonal temperature swing of 49°F / from 24°F in January to 73°F in July. Total annual precipitation is 38.5 inches, with June being the wettest month (4.3") and February the driest (1.7").
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