Climate averages 1991–2020
Waterbury weather
in May.
A mild, moderately wet month: the 5th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Waterbury: daytime highs average 20.0°C and nights cool to about 10.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 87 mm of rain on roughly 11 days, which makes May a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 30 min on an average May day.
The nearest other city in this atlas is New Britain (25 km away). In May its highs average 20.2°C, about as warm as Waterbury, with 84 mm of rain.
Among the 498 cities listed in the United States, Waterbury ranks joint 378th of 498 for the warmest May highs and joint 267th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Waterbury is 3.8°C cooler than that mean.
From May to June, average highs rise by 5.0°C to 25.1°C, and monthly rainfall rises from 87 mm to 100 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Waterbury climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.1°C-5.9°C | -5.9°C | 88 | 9.5 | 9.510 h |
| February | 3.5°C-5.2°C | -5.2°C | 78 | 8.7 | 10.611 h |
| March | 7.8°C-1.4°C | -1.4°C | 106 | 10.7 | 11.912 h |
| April | 14.4°C4.4°C | 4.4°C | 97 | 11.2 | 13.313 h |
| May, selected | 20.0°C10.3°C | 10.3°C | 87 | 11.4 | 14.514 h |
| June | 25.1°C15.6°C | 15.6°C | 100 | 11.2 | 15.115 h |
| July | 28.2°C18.9°C | 18.9°C | 90 | 10.9 | 14.915 h |
| August | 27.2°C18.3°C | 18.3°C | 104 | 10.2 | 13.814 h |
| September | 23.2°C14.6°C | 14.6°C | 101 | 9.1 | 12.513 h |
| October | 16.5°C8.6°C | 8.6°C | 106 | 9.1 | 11.111 h |
| November | 10.3°C2.9°C | 2.9°C | 88 | 8.5 | 9.910 h |
| December | 4.8°C-2.1°C | -2.1°C | 107 | 10.1 | 9.29 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- New Britain in MayUnited States · 25 kmHigh 20.2°C · Low 9.8°C · 84 mm rain
- New Haven in MayUnited States · 30 kmHigh 18.4°C · Low 10.6°C · 98 mm rain
- Hartford in MayUnited States · 38 kmHigh 20.4°C · Low 9.7°C · 84 mm rain
- Danbury in MayUnited States · 38 kmHigh 19.9°C · Low 10.2°C · 99 mm rain
- Bridgeport in MayUnited States · 44 kmHigh 19.0°C · Low 10.9°C · 92 mm rain
- Norwalk in MayUnited States · 57 kmHigh 19.5°C · Low 11.2°C · 85 mm rain
- Stamford in MayUnited States · 69 kmHigh 19.8°C · Low 11.3°C · 85 mm rain
- Springfield (Massachusetts), United States in MayUnited States · 72 kmHigh 19.9°C · Low 9.5°C · 83 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Waterbury) is explained once on the Waterbury year overview and on the Sources, method and limits page.