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Weather & Climate in St. Helena, NE
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Helena experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 20°F in January while summers reach 75°F in July. The area gets 291 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 28.7 inches (drier than the 38-inch national average). The area receives 38.1 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 1,239 feet.
Temperature
20°F Jan (-7°C)
75°F Jul (24°C)
| Annual Average | 48.7°F |
| 10% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 291 days/yr |
Geography
| Elevation | 1,239 ft (378 m) |
| Area | 0.4 sq mi (1.1 km²) |
| Population Density | 270/sq mi |
| Coordinates | 42.8107°N, 97.2489°W |
| Timezone | America/Chicago |
| County | Cedar County County |
| Nearest Airport | Sioux Gateway/Brig General Bud Day Field (SUX) 52 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 21.7 / 100 |
| Social Vulnerability | 16.6 / 100 |
| Community Resilience | 49.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.3.
| Nov 3, 2002 | 16 km SSW of Butte, Nebraska | M4.3 | 135 km | 5 km |
| Jun 4, 2021 | 10 km NE of Anoka, Nebraska | M3.7 | 123 km | 5 km |
| Oct 25, 1990 | 8 km N of Plankinton, South Dakota | M3.6 | 148 km | 5 km |
| Feb 6, 1996 | 1 km N of Wausa, Nebraska | M3.6 | 41 km | 5 km |
| Aug 9, 1997 | 9 km NW of Clarkson, Nebraska | M3.4 | 113 km | 5 km |
| Jun 4, 2021 | 9 km ENE of Anoka, Nebraska | M3.1 | 122 km | 5 km |
| Jan 4, 2021 | 5 km N of Tyndall, South Dakota | M3.1 | 56 km | 5 km |
| Jan 1, 2020 | 2 km E of Chambers, Nebraska | M2.8 | 138 km | 10 km |
| Feb 5, 2025 | 8 km SSE of Tilden, Nebraska | M2.7 | 103 km | 5 km |
| Jan 16, 2022 | 9 km NE of Plankinton, South Dakota | M2.5 | 141 km | 5 km |
| Mar 6, 2024 | 6 km SSE of Santee, Nebraska | M2.5 | 46 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
614 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 9 fatalities, 216 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 16, 2014 | EF4 | 96 km | 23.9 mi | 1 |
| Jun 16, 2014 | EF4 | 82 km | 15.8 mi | 0 |
| Jun 16, 2014 | EF4 | 95 km | 11.5 mi | 1 |
| Oct 4, 2013 | EF4 | 77 km | 18.3 mi | 0 |
| Jun 23, 2003 | EF4 | 35 km | 13.0 mi | 1 |
| Jul 28, 1986 | EF4 | 27 km | 52.5 mi | 0 |
| Jul 7, 1977 | EF4 | 86 km | 22.6 mi | 0 |
| May 6, 1975 | EF4 | 73 km | 4.1 mi | 0 |
| Jun 7, 1965 | EF4 | 40 km | 7.8 mi | 1 |
| May 29, 1962 | EF4 | 99 km | 24.2 mi | 0 |
| Jun 17, 2014 | EF3 | 30 km | 4.0 mi | 0 |
| Oct 4, 2013 | EF3 | 67 km | 6.4 mi | 0 |
| Jul 5, 1994 | EF3 | 94 km | 1.8 mi | 0 |
| May 7, 1993 | EF3 | 88 km | 10.0 mi | 0 |
| Aug 3, 1981 | EF3 | 53 km | 12.8 mi | 0 |
| May 8, 1979 | EF3 | 97 km | 0.1 mi | 0 |
| Jul 5, 1978 | EF3 | 76 km | 8.0 mi | 0 |
| May 6, 1975 | EF3 | 74 km | 44.8 mi | 0 |
| May 6, 1975 | EF3 | 94 km | 15.9 mi | 0 |
| Sep 22, 1968 | EF3 | 99 km | 4.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: SIX PACK (1,649 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | SIX PACK | 1,649 | 51 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 0.5 in | Coldest, Driest |
| February | 24°F (-4°C) | 0.6 in | |
| March | 36°F (2°C) | 1.8 in | |
| April | 49°F (9°C) | 2.4 in | |
| May | 60°F (16°C) | 3.2 in | |
| June | 70°F (21°C) | 3.4 in | Wettest |
| July | 75°F (24°C) | 2.9 in | Warmest |
| August | 73°F (23°C) | 2.6 in | |
| September | 63°F (17°C) | 2.3 in | |
| October | 51°F (11°C) | 1.8 in | |
| November | 34°F (1°C) | 1.3 in | |
| December | 22°F (-5°C) | 0.6 in |
St. Helena has a seasonal temperature swing of 55°F / from 20°F in January to 75°F in July. Total annual precipitation is 23.3 inches, with June being the wettest month (3.4") and January the driest (0.5").