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Weather & Climate in Irwin, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Irwin enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 31°F in January while summers reach 79°F in July. The area gets 253 sunny days per year, above the national average. Annual precipitation totals 45.8 inches (wetter than the 38-inch national average). The area receives 4.3 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 974 feet.
Temperature
31°F Jan (-1°C)
79°F Jul (26°C)
| Annual Average | 56.0°F |
| 4% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 253 days/yr |
Geography
| Elevation | 974 ft (297 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 123/sq mi |
| Coordinates | 37.5887°N, 94.2855°W |
| Timezone | America/Chicago |
| Nearest Airport | Joplin Regional (JLN) 29 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
7 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| May 18, 2005 | Missouri | M3.3 | 101 km | 5 km |
| Mar 30, 2001 | 1 km SW of Hermitage, Missouri | M3.1 | 93 km | 5 km |
| Jan 21, 1992 | 5 km SE of Linn Creek, Missouri | M3.1 | 149 km | 5 km |
| May 21, 2010 | 2 km SW of Centerton, Arkansas | M2.6 | 138 km | 1 km |
| Apr 4, 2015 | 3 km ESE of Clinton, Missouri | M2.6 | 98 km | 2 km |
| Apr 29, 2018 | 3 km WNW of Evergreen, Missouri | M2.5 | 146 km | 2 km |
| Apr 29, 2010 | 3 km SW of Centerton, Arkansas | M2.5 | 139 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
531 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 224 fatalities, 2,052 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2011 | EF5 | 66 km | 21.6 mi | 158 |
| May 10, 2008 | EF4 | 100 km | 75.5 mi | 21 |
| Feb 28, 2007 | EF4 | 94 km | 28.0 mi | 0 |
| May 4, 2003 | EF4 | 74 km | 33.0 mi | 4 |
| Apr 24, 1975 | EF4 | 88 km | 11.9 mi | 3 |
| May 22, 2019 | EF3 | 32 km | 11.3 mi | 3 |
| May 22, 2019 | EF3 | 61 km | 9.2 mi | 0 |
| Mar 12, 2006 | EF3 | 80 km | 42.0 mi | 1 |
| Mar 12, 2006 | EF3 | 81 km | 17.0 mi | 0 |
| Apr 21, 2005 | EF3 | 96 km | 5.0 mi | 0 |
| May 4, 2003 | EF3 | 21 km | 86.0 mi | 5 |
| May 4, 2003 | EF3 | 75 km | 49.0 mi | 7 |
| May 4, 2003 | EF3 | 82 km | 25.0 mi | 5 |
| May 4, 1999 | EF3 | 54 km | 3.0 mi | 0 |
| May 17, 1995 | EF3 | 31 km | 14.0 mi | 0 |
| Apr 29, 1983 | EF3 | 86 km | 5.5 mi | 1 |
| Mar 26, 1983 | EF3 | 41 km | 7.0 mi | 0 |
| Mar 15, 1982 | EF3 | 83 km | 14.0 mi | 0 |
| Mar 15, 1982 | EF3 | 44 km | 9.0 mi | 0 |
| Mar 15, 1982 | EF3 | 46 km | 70.0 mi | 2 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (3,427 acres, 1986).
| Year | Name | Acres Burned | Distance |
| 1986 | UNNAMED | 3,427 | 82 km |
| 2006 | UNNAMED | 2,089 | 94 km |
| 1991 | UNNAMED | 2,043 | 52 km |
| 2005 | NR STEELE | 1,652 | 77 km |
| 1988 | UNNAMED | 1,539 | 74 km |
| 1996 | UNNAMED | 1,356 | 55 km |
| 1996 | UNNAMED | 1,346 | 19 km |
| 1996 | UNNAMED | 1,305 | 64 km |
| 2006 | UNNAMED | 1,282 | 96 km |
| 2006 | GRAND | 1,067 | 72 km |
| 1984 | RESIDENT | 1,048 | 75 km |
| 1994 | UNNAMED | 1,045 | 100 km |
| 1992 | UNNAMED | 912 | 98 km |
| 2005 | UNNAMED | 860 | 54 km |
| 2000 | UNNAMED | 802 | 44 km |
| 2009 | REYNOLDS HOLLOW | 728 | 80 km |
| 2006 | SALT CREEK MARSH | 720 | 65 km |
| 1996 | UNNAMED | 636 | 68 km |
| 2012 | FANCY FENCE | 626 | 72 km |
| 1996 | UNNAMED | 624 | 65 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 1.7 in | Coldest, Driest |
| February | 36°F (2°C) | 2.1 in | |
| March | 46°F (8°C) | 3.9 in | |
| April | 56°F (13°C) | 4.3 in | |
| May | 65°F (18°C) | 5.2 in | |
| June | 74°F (23°C) | 5.4 in | Wettest |
| July | 79°F (26°C) | 3.8 in | Warmest |
| August | 78°F (25°C) | 3.8 in | |
| September | 70°F (21°C) | 5.1 in | |
| October | 58°F (15°C) | 4.1 in | |
| November | 46°F (8°C) | 3.8 in | |
| December | 35°F (2°C) | 2.6 in |
Irwin has a seasonal temperature swing of 48°F / from 31°F in January to 79°F in July. Total annual precipitation is 45.8 inches, with June being the wettest month (5.4") and January the driest (1.7").