Weather & Climate in Mount Ayr, IN

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Mount Ayr experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 24°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 40.1 inches. The area receives 25.3 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 709 feet.

Temperature

24°F Jan (-4°C) 74°F Jul (23°C)

Annual Average	50.5°F
	6% below US avg
January Average	24°F (-4°C)
July Average	74°F (23°C)
Sunny Days	275 days/yr

Geography

Elevation	709 ft (216 m)
Area	0.2 sq mi (0.5 km²)
Population Density	517/sq mi
Coordinates	40.9523°N, 87.2990°W
Timezone	America/Indiana/Indianapolis
County	Newton County County
Nearest Airport	Porter County Regional (VPZ) 38 miles away

Precipitation & Snow

Annual Rainfall 40.1"

6% above US avg

Snowfall 25.3"

Wettest Month (Jun) 4.29"

Driest Month (Feb) 1.54"

Air Quality

AQI Median	41.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	11.7 / 100
Social Vulnerability	25.3 / 100
Community Resilience	52.7 / 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: M4.2.

Jun 28, 2004	12 km NW of Dayton, Illinois	M4.2	145 km	10 km
Jun 17, 2021	Illinois-Indiana border region	M3.8	125 km	6 km
Apr 14, 2000	4 km NW of Heritage Lake, Indiana	M3.6	141 km	5 km
Nov 4, 2013	1 km SSW of Lyons, Illinois	M3.2	104 km	1 km
Dec 17, 1990	Illinois-Indiana border region	M3.2	101 km	10 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	141 km	10 km
Mar 15, 2025	6 km W of Dwight, Illinois	M2.6	102 km	5 km

Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.

Tornado History

585 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 99 fatalities, 2,179 injuries.

Date	Rating	Distance	Path	Fatalities
Apr 26, 1994	EF4	60 km	14.0 mi	3
Jun 13, 1976	EF4	99 km	3.3 mi	2
Mar 20, 1976	EF4	59 km	16.7 mi	0
Apr 3, 1974	EF4	52 km	108.7 mi	18
Apr 21, 1967	EF4	91 km	15.0 mi	33
Apr 11, 1965	EF4	80 km	21.8 mi	0
Apr 11, 1965	EF4	99 km	48.0 mi	25
Apr 17, 1963	EF4	72 km	57.3 mi	1
May 27, 2019	EF3	98 km	13.7 mi	0
Jun 22, 2015	EF3	99 km	16.3 mi	0
Nov 17, 2013	EF3	78 km	37.9 mi	0
Jun 5, 2010	EF3	40 km	7.8 mi	0
Mar 27, 1991	EF3	97 km	15.0 mi	0
Apr 2, 1982	EF3	58 km	12.0 mi	0
Jun 2, 1980	EF3	99 km	18.1 mi	1
Jun 25, 1978	EF3	64 km	27.4 mi	0
Mar 12, 1976	EF3	34 km	38.5 mi	1
Mar 12, 1976	EF3	88 km	12.6 mi	0
Mar 12, 1976	EF3	65 km	12.1 mi	0
Jun 20, 1974	EF3	38 km	4.5 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	90 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

12 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,741 acres, 2019).

Year	Name	Acres Burned	Distance
2019	UNNAMED	1,741	87 km
2019	UNNAMED	1,664	82 km
2000	UNNAMED	1,602	23 km
2021	NORTHEAST PRAIRIE UNIT 3	978	77 km
2024	NORTHEAST PRAIRIE 3 RX	938	78 km
1986	OGDEN DUNS	863	73 km
2021	UNNAMED	738	79 km
2021	MIDDLE GRANT CREEK	700	85 km
2019	UNNAMED	698	79 km
2021	21-INDU TOLLESTON DUNES EAST	594	73 km
2017	UNNAMED	549	86 km
2017	17 INDU COWLES DUNES	522	79 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	24°F (-4°C)	1.7 in	Coldest
February	27°F (-3°C)	1.5 in	Driest
March	38°F (3°C)	2.9 in
April	49°F (10°C)	3.7 in
May	61°F (16°C)	4.1 in
June	70°F (21°C)	4.3 in	Wettest
July	74°F (23°C)	4.0 in	Warmest
August	71°F (22°C)	3.6 in
September	65°F (18°C)	3.4 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

Mount Ayr has a seasonal temperature swing of 50°F / from 24°F in January to 74°F in July. Total annual precipitation is 38.0 inches, with June being the wettest month (4.3") and February the driest (1.5").

View full profile of Mount Ayr, IN →