Historical weather data, all-time temperature records, and monthly climate averages for Cromwell, CT. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Cromwell sits right in the heart of the year's wettest week, with nearly a coin-flip chance (44%) of rain and average temperatures running from 35° to 54°. The date has seen some wild swings over 104 years of records — from a balmy 75° in 2010 to a brutal 8° low back in 1997. Snow is unlikely but not impossible, with a 3% chance keeping early spring on its toes.
Cromwell's weather has real range — from a scorching 103° on July 22, 2011, to a bone-chilling -24° on February 16, 1943, a swing of 127 degrees. The wettest single day on record dropped 6.1 inches of rain during the infamous 1938 New England Hurricane, and a December 1945 storm buried the town under 17.7 inches of snow in a single day.
Summer is Cromwell's sweet spot, peaking the week of July 16–22 with average highs of 85°, while January is the time to stay indoors — average highs barely crack 36° in mid-month. Early April is historically the wettest stretch of the year, averaging over an inch of precipitation in a single week, so pack accordingly if you're visiting in spring.