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Weather & Climate in Brook, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Brook experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 74°F in July. The area gets 282 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 650 feet.
Temperature
25°F Jan (-4°C)
74°F Jul (23°C)
| Annual Average | 51.0°F |
| 6% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 282 days/yr |
Geography
| Elevation | 650 ft (198 m) |
| Area | 0.7 sq mi (1.7 km²) |
| Population Density | 1,440/sq mi |
| Coordinates | 40.8661°N, 87.3657°W |
| Timezone | America/Indiana/Indianapolis |
| County | Newton County County |
| Nearest Airport | Porter County Regional (VPZ) 45 miles away |
Precipitation & Snow
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 | 144 km | 10 km |
| Jun 17, 2021 | Illinois-Indiana border region | M3.8 | 115 km | 6 km |
| Apr 14, 2000 | 4 km NW of Heritage Lake, Indiana | M3.6 | 134 km | 5 km |
| Nov 4, 2013 | 1 km SSW of Lyons, Illinois | M3.2 | 111 km | 1 km |
| Dec 17, 1990 | Illinois-Indiana border region | M3.2 | 93 km | 10 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 142 km | 10 km |
| Mar 15, 2025 | 6 km W of Dwight, Illinois | M2.6 | 98 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
592 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 97 fatalities, 2,130 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 26, 1994 | EF4 | 55 km | 14.0 mi | 3 |
| Mar 20, 1976 | EF4 | 54 km | 16.7 mi | 0 |
| Apr 3, 1974 | EF4 | 45 km | 108.7 mi | 18 |
| Apr 21, 1967 | EF4 | 97 km | 15.0 mi | 33 |
| Apr 11, 1965 | EF4 | 98 km | 48.0 mi | 25 |
| Apr 11, 1965 | EF4 | 75 km | 21.8 mi | 0 |
| Apr 17, 1963 | EF4 | 71 km | 57.3 mi | 1 |
| Jun 22, 2015 | EF3 | 98 km | 16.3 mi | 0 |
| Nov 17, 2013 | EF3 | 73 km | 37.9 mi | 0 |
| Nov 17, 2013 | EF3 | 98 km | 29.8 mi | 0 |
| Jun 5, 2010 | EF3 | 39 km | 7.8 mi | 0 |
| Apr 19, 1996 | EF3 | 97 km | 2.0 mi | 1 |
| Apr 2, 1982 | EF3 | 56 km | 12.0 mi | 0 |
| Jun 2, 1980 | EF3 | 91 km | 18.1 mi | 1 |
| Jun 25, 1978 | EF3 | 59 km | 27.4 mi | 0 |
| Mar 12, 1976 | EF3 | 98 km | 12.6 mi | 0 |
| Mar 12, 1976 | EF3 | 32 km | 38.5 mi | 1 |
| Mar 12, 1976 | EF3 | 76 km | 12.1 mi | 0 |
| Jun 20, 1974 | EF3 | 46 km | 4.5 mi | 0 |
| Apr 3, 1974 | EF3 | 66 km | 25.9 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 | 101 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 | 88 km |
| 2019 | UNNAMED | 1,664 | 84 km |
| 2000 | UNNAMED | 1,602 | 22 km |
| 2021 | NORTHEAST PRAIRIE UNIT 3 | 978 | 79 km |
| 2024 | NORTHEAST PRAIRIE 3 RX | 938 | 80 km |
| 1986 | OGDEN DUNS | 863 | 83 km |
| 2021 | UNNAMED | 738 | 82 km |
| 2021 | MIDDLE GRANT CREEK | 700 | 87 km |
| 2019 | UNNAMED | 698 | 81 km |
| 2021 | 21-INDU TOLLESTON DUNES EAST | 594 | 84 km |
| 2017 | UNNAMED | 549 | 87 km |
| 2017 | 17 INDU COWLES DUNES | 522 | 89 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.7 in | Coldest |
| February | 27°F (-3°C) | 1.5 in | Driest |
| March | 38°F (3°C) | 3.0 in | |
| April | 49°F (10°C) | 3.8 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 70°F (21°C) | 4.3 in | Wettest |
| July | 74°F (23°C) | 4.1 in | Warmest |
| August | 71°F (22°C) | 3.6 in | |
| September | 65°F (18°C) | 3.5 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 |
Brook has a seasonal temperature swing of 49°F / from 25°F in January to 74°F in July. Total annual precipitation is 38.2 inches, with June being the wettest month (4.3") and February the driest (1.5").