| July 2003 | Thunderstorm Wind | Hamilton | 1 hurt, $60,000 | Numerous trees down |
| June 2011 | Thunderstorm Wind | Hamilton | $250,000 | Wind gusts estimated to be 60 to 80 mph downed several trees and large limbs across much of Hamilton, IL around 130 am CDT June 27. A home on North 19th Street sustained roof damage and a power pole was blown down in the front yard. |
| July 2003 | Flash Flood | Hamilton | $100,000 | Water over IL 96 between Hamilton & Nauvoo |
| July 2003 | Thunderstorm Wind | Hamilton | $50,000 | Power lines down |
| June 2011 | Flash Flood | Hamilton | $25,000 | Heavy rains during the predawn hours of June 5 resulted in a portion of Windy Hills Rd just southwest of Hamilton, IL washing out. |
| August 2010 | Thunderstorm Wind | Hamilton | $10,000 | Wind gusts estimated to be 65 mph blew down some large tree limbs and power lines in Hamilton, IL around 540 pm CDT August 20. |
| May 2004 | Thunderstorm Wind | Hamilton | $10,000 | Continuous path of straight line winds from the Mississippi River north of Hamilton to between Ferris and Adrian were 30 power poles were snapped off near the ground. |
| November 2005 | Hail | Hamilton | $1,500 | no account filed |
| May 2000 | Thunderstorm Wind | Hamilton | $1,000 | no account filed |
| August 1993 | Thunderstorm Wind | Hamilton | $500 | Large tree limbs were blown down 2 miles northeast of town. |
| March 2025 | Thunderstorm Wind | Hamilton | - | A tree was blown down. |
| June 2023 | Thunderstorm Wind | Hamilton | - | Very poor visibility. |
| June 2023 | Thunderstorm Wind | Hamilton | - | Tree snapped off, with several large branches blown down. |
| June 2019 | Flash Flood | Hamilton | - | Very heavy rain created significant street flooding, so high that spotter has never seen this before. Water from the street flowed through the spotter's garage. |
| June 2019 | Thunderstorm Wind | Hamilton | - | A report of a tree blown down onto a house near between 17th street and 18th street in Hamilton was reported through social media. |
| June 2019 | Thunderstorm Wind | Hamilton | - | A spotter reported 1 to 2 inch diameter tree limbs blown down in addition to the flash flooding. |
| June 2019 | Hail | Hamilton | - | The public reported a few quarter sized hailstones. |
| June 2019 | Thunderstorm Wind | Hamilton | - | This reported was relayed by the NWS in Lincoln (ILX) Illinois. A public report of pine trees snapped off a few tree limbs of unknown size were also down. The time of the event was estimated using radar. |
| June 2019 | Thunderstorm Wind | Hamilton | - | A trained spotter estimated thunderstorms wind gusts around 60 MPH. |
| June 2019 | Thunderstorm Wind | Hamilton | - | A public report estimated thunderstorm wind gusts around 60 MPH. |
| July 2019 | Thunderstorm Wind | Hamilton | - | A trained spotter reported several two inch tree limbs down. |
| May 2019 | Flood | Hamilton | - | The Mississippi River at Keokuk Lock and Dam 19 began the month above its major flood stage of 19 feet. The river stage at the beginning of the month was 21.4 feet. The river would rise to a crest of 23.5 feet on May 2nd and another higher crest later in the month, in a later storm data entry. The river fell below major flood stage the morning of May 11th. |
| May 2019 | Flash Flood | Hamilton | - | Water was covering roadways and ditches throughout the southern part of Hancock County, in addition, water was covering a portion of the 136 bridge due to poor drainage from sandbagging efforts near the Mississippi River. |
| April 2019 | Flood | Hamilton | - | The Mississippi River at Keokuk Lock and Dam 19 rose back above its major flood stage of 19 feet during the morning hours of April 30th and continued to rise through the end of the month. |
| July 2017 | Flash Flood | Hamilton | - | Local law enforcement reported 6 inches of water blocking the northbound lane of traffic on Highway 96. Traffic was being diverted into the southbound lane. |
| April 2016 | Hail | Hamilton | - | Law Enforcement reported hail that started out as pea sized around 920 PM and increase in size to quarters. |
| March 2016 | Hail | Hamilton | - | This report was received via twitter. |
| July 2014 | Flood | Hamilton | - | Heavy rainfall that fell across the Upper Midwest during the last two weeks of June brought the Mississippi River at Keokuk above the major flood stage of 19 feet around 200 AM on July 3 and fell below major flood stage around 600 AM on July 14. The river crested at 23.4 feet around 1100 PM on July 7. |
| June 2014 | Thunderstorm Wind | Hamilton | - | Law enforcement reported trees and power lines down. |
| June 2013 | Flood | Hamilton | - | Heavy rain across the region late in the month of May led to the Mississippi River being above the major flood stage of 18 feet to begin the month. The river fell below major flood stage by mid morning on the 1st and then rose back above it shortly after midnight on the 4th. The river remained above major flood stage until late in the day on the 9th. |
| June 2012 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 75 mph blew down several trees and six power poles were broken with power lines down in the Montebello Township area northeast of Hamilton, IL at 1007 am CDT June 24. |
| June 2012 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 75 mph blew down a large tree about 3 miles northeast of Hamilton, IL at 1008 am CDT June 24. |
| April 2010 | Hail | Hamilton | - | Quarter sized hail fell near Hamilton, IL at 608 pm April 4. The hail covered the ground. |
| April 2010 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 60 mph knocked down some branches near Hamilton, IL at 608 pm April 4. |
| July 2010 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 65 mph blew a tree down across Highway 96 about 2 miles north of Hamilton, IL around 700 am CDT July 18. |
| August 2010 | Flash Flood | Hamilton | - | Heavy rains resulted in some flash flooding in the Hamilton, IL area during the late afternoon and evening of August 13. |
| October 2010 | Hail | Hamilton | - | Trained spotter reported pea to nickel size hail just east of Hamilton. |
| June 2010 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 65 mph blew a tree down onto the highway in Hamilton, IL around 630 pm June 23. |
| July 2010 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 65 mph blew down a couple of trees in Hamilton, IL at 134 pm CDT July 24. |
| August 2009 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 60 mph were observed about 2 miles north northeast of Hamilton, IL around 700 am August 4. |
| April 2008 | Flash Flood | Hamilton | - | A trained spotter reported creeks and rivers bankfull with some smaller streams out of their banks. Some farm fields were also flooded. |
| June 2008 | Thunderstorm Wind | Hamilton | - | Wind gusts estimated to be 65 to 70 mph were observed just north of Hamilton, IL around 1:35 pm June 15. |
| June 2008 | Hail | Hamilton | - | Nickel to quarter-sized hail fell just north of Hamilton, IL at 1:35 pm June 15. |
| April 2006 | Funnel Cloud | Hamilton | - | Funnel cloud north of Hamilton |
| July 2001 | Thunderstorm Wind | Hamilton | - | Power lines down. Reported by law enforcement. |
| April 2026 | Thunderstorm Wind | Hamilton | - | no account filed |
| June 2019 | Hail | Hamilton | - | no account filed |
| September 2019 | Hail | Hamilton | - | no account filed |
| May 2013 | Hail | Hamilton | - | no account filed |
| April 1999 | Flood | Hamilton | - | no account filed |
| June 1998 | Hail | Hamilton | - | no account filed |
| April 1996 | Hail | Hamilton | - | no account filed |
| April 1995 | Hail | Hamilton | - | no account filed |