Weather & Climate in New Berlin, WI

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

New Berlin experiences four distinct seasons with an average annual temperature of 47°F (9°C). Winters average 21°F in January while summers reach 72°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 38.4 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 896 feet.

Temperature

21°F Jan (-6°C) 72°F Jul (22°C)

Annual Average	47.3°F
	12% below US avg
January Average	21°F (-6°C)
July Average	72°F (22°C)
Sunny Days	260 days/yr

Geography

Elevation	896 ft (273 m)
Area	36.9 sq mi (95.5 km²)
Population Density	1,109/sq mi
Coordinates	42.9720°N, 88.1292°W
Timezone	America/Chicago
County	Walworth County County
Nearest Airport	General Mitchell International (MKE) 12 miles away

Precipitation & Snow

Annual Rainfall 38.4"

1% above US avg

Wettest Month (Aug) 3.90"

Driest Month (Feb) 1.22"

Air Quality

AQI Median	38.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	74.8 / 100
Social Vulnerability	20.8 / 100
Community Resilience	80.3 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Very Low
Earthquake	Very Low
Wildfire	Very Low
Flood	Relatively Moderate
Hail	Relatively High
Strong Wind	Relatively Moderate
Heat Wave	Relatively Low
Winter Weather	Relatively Low
Lightning	Relatively Moderate
Ice Storm	Relatively Low
Drought	Relatively Low
Cold Wave	Relatively Moderate
Landslide	Relatively Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.

Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	116 km	10 km
Nov 4, 2013	1 km SSW of Lyons, Illinois	M3.2	133 km	1 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	89 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	114 km	5 km

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

Tornado History

381 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 17 fatalities, 669 injuries.

Date	Rating	Distance	Path	Fatalities
Jul 18, 1996	EF5	90 km	13.3 mi	0
Apr 27, 1984	EF4	20 km	6.5 mi	1
Apr 4, 1981	EF4	51 km	1.8 mi	3
Sep 28, 1972	EF4	80 km	5.2 mi	0
Apr 21, 1967	EF4	92 km	8.8 mi	1
Apr 11, 1965	EF4	86 km	9.1 mi	6
Aug 22, 1964	EF4	48 km	2.2 mi	0
Jan 7, 2008	EF3	50 km	10.8 mi	0
Jan 7, 2008	EF3	86 km	13.2 mi	0
Jun 5, 1980	EF3	55 km	10.7 mi	0
Apr 7, 1980	EF3	89 km	1.2 mi	0
Jun 4, 1975	EF3	94 km	2.3 mi	0
Apr 21, 1974	EF3	77 km	58.6 mi	2
Apr 21, 1974	EF3	82 km	22.2 mi	0
Jul 19, 1963	EF3	45 km	10.6 mi	0
Jun 22, 2024	EF2	89 km	6.0 mi	0
Aug 28, 2018	EF2	78 km	3.9 mi	0
Nov 22, 2010	EF2	99 km	18.1 mi	0
Jul 22, 2010	EF2	13 km	1.0 mi	0
Jun 21, 2010	EF2	33 km	5.2 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

8 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,524 acres, 2006).

Year	Name	Acres Burned	Distance
2006	UNNAMED	1,524	73 km
2010	RX BURN	1,236	73 km
1994	SOMMERS	938	80 km
1988	PEACHY RD	812	77 km
2024	IBSP SOUTH F1 RX	690	68 km
2006	UNNAMED	612	82 km
2007	TOWER RD 2	592	77 km
2024	RX-HWY Y - SOUTH	553	50 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	21°F (-6°C)	1.5 in	Coldest
February	24°F (-5°C)	1.2 in	Driest
March	34°F (1°C)	2.2 in
April	45°F (7°C)	3.4 in
May	56°F (14°C)	3.0 in
June	66°F (19°C)	3.7 in
July	72°F (22°C)	3.8 in	Warmest
August	69°F (21°C)	3.9 in	Wettest
September	62°F (17°C)	3.7 in
October	50°F (10°C)	2.4 in
November	37°F (3°C)	2.4 in
December	25°F (-4°C)	1.9 in

New Berlin has a seasonal temperature swing of 51°F / from 21°F in January to 72°F in July. Total annual precipitation is 33.2 inches, with August being the wettest month (3.9") and February the driest (1.2").

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