Defiance, MO Live Doppler Radar
Live radar for Defiance, St. Charles County: every NWS radar combined, rain, snow and ice colors, flash-flood risk, storm tracks and official warnings.
What weather hits Defiance?
Since 1996, the National Weather Service has logged damaging thunderstorm winds on 162 days in the St. Charles forecast zone and St. Charles County — the most common reported hazard around Defiance, mostly in June and May. Next come excessive heat (78 days) and heavy snow & winter storms (49 days).
| Hazard | Days reported | Most recent | Worst on record |
|---|---|---|---|
| Damaging thunderstorm winds | 162 | Jun 2026 | May 7, 2002 · $1.8 million damage |
| Excessive heat | 78 | Aug 2025 | Jul 1, 2012 · 1 death |
| Heavy snow & winter storms | 49 | Nov 2025 | Nov 30, 2006 · $20 million damage |
| Flash flooding | 41 | Jun 2026 | Jul 26, 2022 · $10 million damage |
| Flooding | 20 | Jun 2019 | May 3, 2019 · 2 deaths |
| High winds | 13 | Mar 2025 | Mar 14, 2025 · $20,000 damage |
| Ice storms & sleet | 7 | Feb 2022 | Jan 12, 2007 · $169,000 damage |
| Lightning casualties & damage | 6 | Jun 2014 | Jun 21, 2014 · $487,000 damage |
Source: NOAA NCEI Storm Events Database, 1996–2026 (the latest year is partial). A "day" is a date with at least one report in the St. Charles forecast zone and St. Charles County; damage is as reported, not adjusted for inflation.
How much snow does Defiance get?
A normal year brings about 14 inches of snow to Defiance, based on NOAA's 1991–2020 climate normals for the Weldon Spring Nws weather station 7.1 miles away. The snowiest month is usually January (4.1 in).
| Oct | Nov | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| 0.0 | 0.8 | 3.0 | 4.1 | 3.7 | 1.7 | 0.2 | 0.0 |
Normal snowfall in inches. TALON Pro compares this season's snow at your location with these normals as winter goes on.
Which radars cover Defiance?
The closest NEXRAD Doppler radar is KLSX (St. Louis, MO), about 7 miles northeast. Radar beams climb as they travel, so the height of the lowest scan over town decides how low in a storm the radar can see.
| Radar | Distance | Lowest beam over Defiance | View |
|---|---|---|---|
| KLSX St. Louis, MO | 7 mi northeast | 400 ft | Excellent — the lowest scan sees close to the ground |
| KILX Lincoln, IL | 130 mi northeast | 14,500 ft | Limited — the beam overshoots the lowest part of storms |
| KPAH Paducah, KY | 154 mi southeast | 19,000 ft | Limited — the beam overshoots the lowest part of storms |
Beam height is the center of the 0.5° scan above the radar, with standard refraction. Mountains near a radar can block it further.
Tornado & hail history near Defiance
Since 1950, NOAA has recorded 134 tornadoes within 25 miles of Defiance, 30 of them EF2/F2 or stronger. Most came in May and April. The strongest was an F4 on February 10, 1959, which passed about 12 miles southeast of town and caused 21 deaths. The most recent was an EF1 on June 4, 2025, which passed about 7 miles east-southeast of town.
Hail: 796 reports of 1-inch or larger hail within 25 miles since 1955, 95 of them 2 inches or more; the largest was 4.50-inch hail on April 22, 2011.
Source: NOAA Storm Prediction Center — tornadoes 1950–2025, hail 1955–2025. Distances are to each tornado's track; ratings before February 2007 use the original Fujita scale.
On TALON you get Defiance's live radar loop, rain/snow/ice colors, flash-flood risk, storm tracks with arrival times and NWS warnings free; close-up radar and rotation detection are part of TALON Pro.
Defiance radar FAQ
Where is the nearest weather radar to Defiance, MO?
KLSX (St. Louis, MO), about 7 miles northeast. KILX (Lincoln, IL) is 130 miles away and also covers the area.
Does radar show snow in Defiance?
Yes. TALON colors snow blue, a rain–snow mix pink and freezing rain purple using NOAA's precipitation-type analysis. Over Defiance the lowest scan from KLSX is about 400 ft up.
Is TALON's radar for Defiance free?
Yes — the US radar loop, rain/snow/ice colors, flash-flood risk, storm tracks and NWS warnings are free in any browser. Close-up radar, rotation detection and longer forecasts are part of TALON Pro.
Should I rely on radar for my safety?
No app replaces official warnings. When the National Weather Service issues a warning for Defiance, follow it right away — see watch vs. warning.
Radar for nearby towns
- Wildwood, MO radar 7 mi
- Dardenne Prairie, MO radar 8 mi
- Weldon Spring, MO radar 9 mi
- Lake St. Louis, MO radar 10 mi
- Clarkson Valley, MO radar 10 mi
- Cottleville, MO radar 11 mi
- Pacific, MO radar 11 mi
- Ellisville, MO radar 11 mi
- O'Fallon, MO radar 11 mi
- Chesterfield, MO radar 11 mi