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Weather & Climate in Rock Island, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Rock Island enjoys a temperate climate with an average annual temperature of 69°F (20°C). Winters average 51°F in January while summers reach 84°F in July. The area gets 330 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 45.0 inches. Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 228 feet.
Temperature
51°F Jan (11°C)
84°F Jul (29°C)
| Annual Average | 68.8°F |
| 27% above US avg | |
| January Average | 51°F (11°C) |
| July Average | 84°F (29°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 228 ft (69 m) |
| Area | 5.0 sq mi (13.0 km²) |
| Population Density | 74/sq mi |
| Coordinates | 29.5138°N, 96.5671°W |
| Timezone | America/Chicago |
| County | Colorado County County |
| Nearest Airport | Wharton Regional (WHT) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 62.3 / 100 |
| Social Vulnerability | 83.9 / 100 |
| Community Resilience | 40.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
100 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.6.
| Jan 30, 2025 | 18 km ENE of Falls City, Texas | M4.6 | 134 km | 7 km |
| Sep 14, 2023 | 16 km ENE of Falls City, Texas | M4.1 | 136 km | 8 km |
| Feb 22, 2024 | 3 km E of Falls City, Texas | M3.9 | 149 km | 8 km |
| Jan 31, 2025 | 19 km ENE of Falls City, Texas | M3.5 | 133 km | 7 km |
| May 2, 2024 | 2 km E of Falls City, Texas | M3.5 | 150 km | 7 km |
| Apr 10, 2021 | 10 km SSE of Smiley, Texas | M3.4 | 107 km | 5 km |
| Apr 17, 2024 | 21 km ENE of Falls City, Texas | M3.2 | 132 km | 7 km |
| Feb 17, 2024 | 4 km E of Falls City, Texas | M3.2 | 149 km | 8 km |
| Feb 7, 2021 | 8 km ESE of Smiley, Texas | M3.2 | 101 km | 6 km |
| Jan 3, 2025 | 20 km ENE of Falls City, Texas | M3.1 | 133 km | 7 km |
| Sep 11, 2023 | 17 km ENE of Falls City, Texas | M3.1 | 136 km | 8 km |
| May 14, 2019 | 1 km SSE of Smiley, Texas | M3.1 | 107 km | 5 km |
| Apr 18, 2020 | 21 km ENE of Falls City, Texas | M3.1 | 131 km | 5 km |
| Feb 12, 2018 | 10 km ENE of Falls City, Texas | M3.1 | 143 km | 5 km |
| May 12, 2019 | 18 km N of Yorktown, Texas | M3.1 | 97 km | 5 km |
| Feb 19, 2015 | 3 km N of Hallettsville, Texas | M3.1 | 37 km | 5 km |
| May 10, 2019 | 13 km SSE of Stockdale, Texas | M3.0 | 136 km | 5 km |
| Jul 2, 2017 | 13 km NE of Falls City, Texas | M3.0 | 140 km | 5 km |
| Mar 4, 2019 | 11 km SE of Cuero, Texas | M3.0 | 82 km | 5 km |
| Sep 11, 2023 | 17 km ENE of Falls City, Texas | M3.0 | 136 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
12 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Beryl | Category 1 | 92 mph | 60 km |
| 2021 | Nicholas | Category 1 | 75 mph | 116 km |
| 2020 | Hanna | Category 1 | 92 mph | 274 km |
| 2017 | Harvey | Category 4 | 132 mph | 115 km |
| 2008 | Ike | Category 2 | 109 mph | 158 km |
| 2007 | Humberto | Category 1 | 92 mph | 194 km |
| 2005 | Rita | Category 3 | 115 mph | 262 km |
| 2003 | Claudette | Category 1 | 92 mph | 107 km |
| 1989 | Chantal | Category 1 | 81 mph | 210 km |
| 1989 | Jerry | Category 1 | 86 mph | 156 km |
| 1986 | Bonnie | Category 1 | 86 mph | 223 km |
| 1983 | Alicia | Category 3 | 115 mph | 105 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
512 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 11 fatalities, 225 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Dec 24, 1975 | EF3 | 55 km | 1.0 mi | 0 |
| Sep 13, 1974 | EF3 | 79 km | 3.6 mi | 0 |
| Nov 5, 1968 | EF3 | 90 km | 14.4 mi | 0 |
| Sep 20, 1967 | EF3 | 50 km | 0.1 mi | 0 |
| Sep 20, 1967 | EF3 | 52 km | 4.3 mi | 0 |
| Sep 20, 1967 | EF3 | 97 km | 1.0 mi | 4 |
| Sep 20, 1967 | EF3 | 47 km | 19.9 mi | 0 |
| Sep 20, 1967 | EF3 | 47 km | 19.9 mi | 0 |
| Sep 20, 1967 | EF3 | 28 km | 2.0 mi | 0 |
| Mar 28, 1966 | EF3 | 24 km | 9.3 mi | 0 |
| Feb 9, 1966 | EF3 | 61 km | 2.0 mi | 0 |
| Apr 19, 1965 | EF3 | 55 km | 0.2 mi | 1 |
| Nov 22, 1961 | EF3 | 49 km | 2.0 mi | 0 |
| Oct 14, 1957 | EF3 | 87 km | 1.0 mi | 0 |
| Mar 20, 1957 | EF3 | 96 km | 16.9 mi | 0 |
| Mar 20, 1957 | EF3 | 88 km | 7.2 mi | 0 |
| Apr 28, 1953 | EF3 | 79 km | 0.5 mi | 0 |
| Jun 5, 1950 | EF3 | 76 km | 23.9 mi | 0 |
| May 3, 2019 | EF2 | 58 km | 2.4 mi | 0 |
| Feb 14, 2017 | EF2 | 83 km | 0.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
11 wildfires (100+ acres) recorded within 100 km. Largest: BASTROP COUNTY COMPLEX (31,838 acres, 2011).
| Year | Name | Acres Burned | Distance |
| 2011 | BASTROP COUNTY COMPLEX | 31,838 | 94 km |
| 2011 | DELHI | 4,735 | 90 km |
| 2015 | HIDDEN PINES | 3,807 | 87 km |
| 2011 | BAILEY | 3,136 | 29 km |
| 2011 | LUTHERHILL | 2,215 | 58 km |
| 2009 | REESE LANE | 1,888 | 29 km |
| 2017 | SALEM RD | 1,672 | 77 km |
| 2011 | GEORGE BUSH PARK | 1,557 | 92 km |
| 2009 | WILDERNESS RIDGE | 1,278 | 88 km |
| 2009 | EL TORRO | 1,108 | 69 km |
| 1998 | PRAUSE PRAIRIE | 1,027 | 36 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (11°C) | 3.1 in | Coldest |
| February | 54°F (12°C) | 2.7 in | |
| March | 61°F (16°C) | 2.4 in | Driest |
| April | 68°F (20°C) | 3.0 in | |
| May | 74°F (24°C) | 5.4 in | Wettest |
| June | 80°F (27°C) | 4.4 in | |
| July | 84°F (29°C) | 2.7 in | Warmest |
| August | 83°F (28°C) | 3.0 in | |
| September | 78°F (26°C) | 4.9 in | |
| October | 70°F (21°C) | 3.6 in | |
| November | 60°F (16°C) | 3.4 in | |
| December | 53°F (12°C) | 2.8 in |
Rock Island has a seasonal temperature swing of 32°F / from 51°F in January to 84°F in July. Total annual precipitation is 41.4 inches, with May being the wettest month (5.4") and March the driest (2.4").