Climate averages 1991–2020
Norwalk weather
in April.
A cool, wet month: the 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a cool month in Norwalk: daytime highs average 14.0°C and nights cool to about 5.5°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 93 mm of rain on roughly 11 days, which makes April a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 17 min on an average April day.
The nearest other city in this atlas is Stamford (13 km away). In April its highs average 14.3°C, about as warm as Norwalk, with 93 mm of rain.
Among the 498 cities listed in the United States, Norwalk ranks joint 404th of 498 for the warmest April highs and joint 307th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Norwalk is 5.3°C cooler than that mean.
From April to May, average highs rise by 5.5°C to 19.5°C, and monthly rainfall falls from 93 mm to 85 mm.
The annual picture
April 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
Norwalk climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.6°C-4.1°C | -4.1°C | 84 | 9.0 | 9.610 h |
| February | 3.8°C-3.8°C | -3.8°C | 78 | 8.7 | 10.611 h |
| March | 7.8°C-0.1°C | -0.1°C | 105 | 10.3 | 11.912 h |
| April, selected | 14.0°C5.5°C | 5.5°C | 93 | 10.5 | 13.313 h |
| May | 19.5°C11.2°C | 11.2°C | 85 | 10.9 | 14.514 h |
| June | 24.8°C16.9°C | 16.9°C | 94 | 10.8 | 15.115 h |
| July | 28.1°C20.5°C | 20.5°C | 92 | 10.7 | 14.815 h |
| August | 27.0°C19.9°C | 19.9°C | 103 | 10.5 | 13.814 h |
| September | 23.1°C16.4°C | 16.4°C | 94 | 9.0 | 12.513 h |
| October | 16.7°C10.5°C | 10.5°C | 100 | 8.5 | 11.111 h |
| November | 10.7°C4.8°C | 4.8°C | 82 | 8.5 | 9.910 h |
| December | 5.5°C-0.2°C | -0.2°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
April in nearby cities
- Stamford in AprilUnited States · 13 kmHigh 14.3°C · Low 5.5°C · 93 mm rain
- Bridgeport in AprilUnited States · 20 kmHigh 13.6°C · Low 5.3°C · 104 mm rain
- Danbury in AprilUnited States · 31 kmHigh 14.4°C · Low 4.4°C · 97 mm rain
- Greenburgh in AprilUnited States · 38 kmHigh 14.7°C · Low 5.4°C · 93 mm rain
- New Haven in AprilUnited States · 45 kmHigh 13.1°C · Low 5.2°C · 116 mm rain
- Yonkers in AprilUnited States · 46 kmHigh 15.1°C · Low 5.3°C · 93 mm rain
- The Bronx in AprilUnited States · 49 kmHigh 15.1°C · Low 5.2°C · 92 mm rain
- Waterbury in AprilUnited States · 57 kmHigh 14.4°C · Low 4.4°C · 97 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 Norwalk) is explained once on the Norwalk year overview and on the Sources, method and limits page.
Stamford lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.