Climate averages 1991–2020
Stamford weather
in May.
A mild, moderately wet month: the 5th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Stamford: daytime highs average 19.8°C and nights cool to about 11.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 85 mm of rain on roughly 11 days, which makes May a moderately wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 27 min on an average May day.
The nearest other city in this atlas is Norwalk (13 km away). In May its highs average 19.5°C, about as warm as Stamford, with 85 mm of rain.
Among the 498 cities listed in the United States, Stamford ranks joint 394th of 498 for the warmest May highs and joint 248th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Stamford is 4.0°C cooler than that mean.
From May to June, average highs rise by 5.2°C to 25.0°C, and monthly rainfall rises from 85 mm to 94 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
Stamford climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.7°C-4.2°C | -4.2°C | 84 | 9.0 | 9.610 h |
| February | 3.9°C-3.8°C | -3.8°C | 78 | 8.7 | 10.611 h |
| March | 8.0°C-0.1°C | -0.1°C | 105 | 10.3 | 11.912 h |
| April | 14.3°C5.5°C | 5.5°C | 93 | 10.5 | 13.313 h |
| May, selected | 19.8°C11.3°C | 11.3°C | 85 | 10.9 | 14.514 h |
| June | 25.0°C17.0°C | 17.0°C | 94 | 10.8 | 15.115 h |
| July | 28.3°C20.5°C | 20.5°C | 92 | 10.7 | 14.815 h |
| August | 27.2°C19.9°C | 19.9°C | 103 | 10.5 | 13.814 h |
| September | 23.2°C16.4°C | 16.4°C | 94 | 9.0 | 12.513 h |
| October | 16.8°C10.4°C | 10.4°C | 100 | 8.5 | 11.111 h |
| November | 10.8°C4.7°C | 4.7°C | 82 | 8.5 | 9.910 h |
| December | 5.5°C-0.3°C | -0.3°C | 105 | 9.8 | 9.39 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
- Norwalk in MayUnited States · 13 kmHigh 19.5°C · Low 11.2°C · 85 mm rain
- Greenburgh in MayUnited States · 26 kmHigh 20.2°C · Low 11.2°C · 87 mm rain
- Bridgeport in MayUnited States · 32 kmHigh 19.0°C · Low 10.9°C · 92 mm rain
- Yonkers in MayUnited States · 33 kmHigh 20.6°C · Low 11.2°C · 91 mm rain
- The Bronx in MayUnited States · 36 kmHigh 20.6°C · Low 11.1°C · 85 mm rain
- Danbury in MayUnited States · 39 kmHigh 19.9°C · Low 10.2°C · 99 mm rain
- Manhattan in MayUnited States · 47 kmHigh 20.6°C · Low 11.1°C · 85 mm rain
- Queens in MayUnited States · 48 kmHigh 20.1°C · Low 11.5°C · 85 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 Stamford) is explained once on the Stamford year overview and on the Sources, method and limits page.
Norwalk lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.