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Weather & Climate in Bertram, IA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Bertram experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 73°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 35.9 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 778 feet.
Temperature
20°F Jan (-7°C)
73°F Jul (23°C)
| Annual Average | 48.3°F |
| 11% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 778 ft (237 m) |
| Area | 1.7 sq mi (4.4 km²) |
| Population Density | 145/sq mi |
| Coordinates | 41.9517°N, 91.5378°W |
| Timezone | America/Chicago |
| County | Johnson County County |
| Nearest Airport | The Eastern Iowa (CID) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.4 / 100 |
| Social Vulnerability | 11.4 / 100 |
| Community Resilience | 96.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
647 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 14 fatalities, 494 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 15, 1968 | EF5 | 86 km | 13.1 mi | 5 |
| Mar 31, 2023 | EF4 | 82 km | 19.9 mi | 0 |
| Mar 13, 1990 | EF4 | 32 km | 19.0 mi | 0 |
| Aug 12, 1974 | EF4 | 45 km | 5.0 mi | 0 |
| Aug 12, 1974 | EF4 | 58 km | 2.0 mi | 0 |
| Aug 26, 1965 | EF4 | 67 km | 4.7 mi | 1 |
| Apr 11, 1965 | EF4 | 52 km | 91.5 mi | 1 |
| Apr 30, 1954 | EF4 | 24 km | 80.4 mi | 0 |
| May 25, 2008 | EF3 | 82 km | 32.0 mi | 0 |
| Jun 1, 2007 | EF3 | 81 km | 15.8 mi | 0 |
| May 21, 2004 | EF3 | 26 km | 3.0 mi | 0 |
| May 11, 2000 | EF3 | 98 km | 18.6 mi | 1 |
| May 15, 1998 | EF3 | 76 km | 47.0 mi | 0 |
| Jul 27, 1995 | EF3 | 73 km | 20.0 mi | 0 |
| May 9, 1995 | EF3 | 69 km | 10.0 mi | 0 |
| Jun 19, 1993 | EF3 | 79 km | 14.0 mi | 0 |
| Jun 19, 1993 | EF3 | 52 km | 9.0 mi | 0 |
| Jul 13, 1992 | EF3 | 42 km | 5.0 mi | 0 |
| May 8, 1988 | EF3 | 67 km | 32.0 mi | 0 |
| May 30, 1985 | EF3 | 100 km | 34.0 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
7 wildfires (100+ acres) recorded within 100 km. Largest: HSB 03 2 (1,130 acres, 2002).
| Year | Name | Acres Burned | Distance |
| 2002 | HSB 03 2 | 1,130 | 100 km |
| 2009 | UNNAMED | 939 | 60 km |
| 2010 | FOLEY | 786 | 58 km |
| 2000 | DESTRUST A | 756 | 99 km |
| 2011 | ACE AUTO | 676 | 49 km |
| 2004 | HSB 009 | 608 | 100 km |
| 2011 | IRCP WUI ROFAE #2 FY11 | 510 | 66 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.1 in | Coldest |
| February | 25°F (-4°C) | 1.0 in | Driest |
| March | 37°F (3°C) | 2.2 in | |
| April | 50°F (10°C) | 3.4 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 70°F (21°C) | 4.7 in | Wettest |
| July | 73°F (23°C) | 4.4 in | Warmest |
| August | 72°F (22°C) | 4.3 in | |
| September | 64°F (18°C) | 4.1 in | |
| October | 52°F (11°C) | 2.6 in | |
| November | 37°F (3°C) | 2.2 in | |
| December | 24°F (-4°C) | 1.6 in |
Bertram has a seasonal temperature swing of 53°F / from 20°F in January to 73°F in July. Total annual precipitation is 35.7 inches, with June being the wettest month (4.7") and February the driest (1.0").