Climate and monthly weather forecastNorwalk, CT
Climate and monthly weather forecast
The climate of Norwalk
Taking account of geographical position and the set of climatological parameters, Norwalk, Connecticut, USA is classified as a Humid Subtropical climate according to the Köppen climate classification system. In this classification, a key feature is that there is no dry season, and the climate maintains a fairly consistent humidity throughout the year, with relative humidity averaging between 72% and 76% during the twelve months.Norwalk experiences a noticeable range in temperatures during the year. In the warmer months of July and August, average high temperatures reach up to 81.1°F (27.3°C) and 80.1°F (26.7°C) respectively. In stark contrast, the colder months of January and February record low average temperatures of 26.4°F (-3.1°C) and 27.3°F (-2.6°C). Snowfall occurs predominantly in these colder months, precisely from December to March, in quantities between 2.01" (51mm) and 2.83" (72mm).
Rainfall is not biased to any particular season in Norwalk; there is observable precipitation throughout the year. Equally distributed through a year, rainfall quantity ranges from 2.36" (60mm) to 4.13" (105mm). The month observing the highest average rainfall is July, with 4.13" (105mm), while the least falls in January and February with 2.36" (60mm) each. It is interesting to note that months signaling the start of seasons, namely April, July, and October, present a higher number of rainfall days.
The best time to visit Norwalk
Given that weather preferences can vary dramatically from person to person, the recommended time to visit Norwalk could differ. However, considering factors such as temperature, humidity, and rainfall, the months from late spring to early fall could provide the most agreeable conditions. Ranging from May to September, the temperatures are moderate, with highs oscillating from 65.8°F (18.8°C) to 80.1°F (26.7°C). These months also see reduced wind speeds, descending from a maximum of 9.1mph (14.6km/h) in April to a minimum of 6.5mph (10.5km/h) in July.Several outdoor activities can be planned during this period thanks to longer daylight hours. June boasts the longest daylight duration of 15.1 hours, which slowly descends to 12.5 hours by September.
The worst time to visit Norwalk
Less hospitable for visitors without a preference for cold weather, the months from December to February could present a challenge. Average high temperatures during this period barely touch the mid-thirties in Fahrenheit, while lows can drop below freezing. Accompanied by strong winds, up to 9.8mph (15.8km/h) to be precise, these low temperatures may feel even more numbing. It is also during these winter months that Norwalk sees its most significant snowfall, reaching up to 2.83" (72mm) in February.Spring weather in Norwalk
Spring months from March to May in Norwalk see a steady increase in temperatures from an average high of 44.4°F (6.9°C) in March to 65.8°F (18.8°C) in May. Simultaneously, daylight hours are also on the rise, increasing from 12 hours in March to 14.5 hours in May. Even with these warming conditions, rainfall sees an uptick in both quantity and number of days. While March receives an average of 2.8" (71mm) of rain over 12.5 days, May collects an average of 3.11" (79mm) over 17.1 days.Summer weather in Norwalk
Summers in Norwalk are marked by warm temperatures, long daylight hours, and consistent humidity. Average high temperatures from June to August fluctuate between 74.1°F (23.4°C) and 81.1°F (27.3°C), while low temperatures rarely dip below the high sixties. Daylight hours peak in June, extending up to 15.1 hours. Despite this abundance of sunlight, summers also register the highest occurrences of rainfall, with July seeing an average 4.13" (105mm) over 18.1 days.Autumn weather in Norwalk
Shifting from September through November, autumn in Norwalk is characterised by decreasing temperatures and daylight hours. Highs plunge from 73°F (22.8°C) in September to 50.9°F (10.5°C) in November, while daylight reduces from 12.5 hours to 9.9 hours. Rainfall continues to be significant during this period with October witnessing the second-highest rainfall in the year, reaching 3.5" (89mm).Winter weather in Norwalk
Winter arrives in Norwalk in December and lasts through February. During this period, the temperature visibly dips with average highs going from 41.9°F (5.5°C) in December to a low of 35.8°F (2.1°C) in January. Lower temperatures are accompanied by shorter daylight hours, dropping to 9.3 hours in December. This season is also marked by snowfall, peaking at 2.83" (72mm) in February.Weather in January
The year kicks off in Norwalk, Connecticut, USA with typically winter conditions. January typically brings a chilly combination of snow and rainfall, rendering the city a winter wonderland. With mean daily high temperatures of 35.8°F (2.1°C) and lows dipping to 26.4°F (-3.1°C), Norwalk residents are quite acquainted with the cold. Weather in January »Weather in February
Compared to January, February is a slightly warmer but anticipated cold winter month. Norwalk sustains moderately high relative humidity at 76%, contributing to the overall chill in the air. Temperatures rise marginally from January, with highs reaching up to 38.1°F (3.4°C) and lows at 27.3°F (-2.6°C). Weather in February »Weather in March
March signals the shift from intense winter pressures to the beginning of the spring season in Norwalk. There's an evident jump in temperature ranges from February, as the highs hit 44.4°F (6.9°C) and lows rise to 33.4°F (0.8°C). Weather in March »Weather in April
April sees the full bloom of spring in Norwalk with its share of consistent rain showers. April’s weather deviates considerably from March's, characterized by warmer temperatures, increased daylight hours, and a substantial dip in snowfall. Weather in April »Weather in May
May brings a breath of fresh air in Norwalk with pleasant temperatures marking the transition into summer. The city witnesses higher temperatures with highs soaring up to 65.8°F (18.8°C) and lows maintaining a mild 52.7°F (11.5°C). Weather in May »Weather in June
June introduces the summer solstice in Norwalk, bringing the longest period of daylight for the year. While noticeably warmer than May, temperatures still hover in the pleasant range, with highs peaking at 74.1°F (23.4°C) and lows at approximately 61°F (16.1°C). Weather in June »Weather in July
July is the warmest month in Norwalk, showcasing typical summer weather and high sun exposures. Temperatures rise significantly from June, topping at 81.1°F (27.3°C) for high temperatures, and 68.2°F (20.1°C) for low temperatures. Weather in July »Weather in August
The summer season reaches its finale in August, with temperature highs nearly matching those of July at 80.1°F (26.7°C), and lows resting at 67.8°F (19.9°C). Although warmer than June, August brings an appealing end to the summer season, balancing heat with the slight cooling breeze. Weather in August »Weather in September
September in Norwalk ushers in the fall season, with temperatures retreating from the summer highs. High temperatures drop to 73°F (22.8°C) and low temperatures to 61.2°F (16.2°C), signaling the arrival of mild temperatures. Weather in September »Weather in October
October in Norwalk emerges as a true fall month. The weather, cooler than September’s, necessitates warmer clothing, as high temperatures average at 61.9°F (16.6°C) and low temperatures dive to 51.3°F (10.7°C). The trees in Norwalk adorn vibrant colored foliage, adding charm to the city's landscape. Weather in October »Weather in November
November sees a brisk drop in temperatures, hinting at the approaching winter. With high temperatures averaging 50.9°F (10.5°C) and low temperatures falling to 40.3°F (4.6°C), chilly winds signify the reign of winter in the near future. Weather in November »Weather in December
December marks the onset of winter and festive cheer in Norwalk. The weather in December considerably drops from November, with high temperatures reaching 41.9°F (5.5°C) and low temperatures falling to 32.9°F (0.5°C). Along with the festive excitement, residents brace for the cold, chilly winds, frosty mornings, and possibilities of snowfall characteristic to the month, rounding off the year on a wintry note. Setting in of December comes with a decrease in the average high-temperature, moving from a cool 50.9°F (10.5°C) in November to a cold 41.9°F (5.5°C). Weather in December »Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
The coldest period tends to be January, when average temperatures fluctuate between a high of 35.8°F (2.1°C) and a low of 26.4°F (-3.1°C).
January and February are months with the least rain when the rain falls for 8.3 days and typically aggregates up to 2.36" (60mm) of rain.
In Norwalk, Connecticut, during the entire year, the rain falls for 166.3 days and collects up to 37.87" (962mm) of precipitation.
January through April, November and December are months with snowfall in Norwalk.
In Norwalk, Connecticut, during the entire year, snow falls for 24.6 days and aggregates up to 9.61" (244mm) of snow.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Norwalk.
February, May and June, with an average relative humidity of 76%, are most humid months.
The month with the most snowfall is February, when snow falls for 7.4 days and typically aggregates up to 2.83" (72mm) of snow.
The month with the coldest seawater is February, with an average ocean temperature of 39°F (3.9°C).
February has the least sunshine of the year in Norwalk, Connecticut, with an average of 4.7h of sunshine.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The months with the lowest humidity are April and November, with an average relative humidity of 72%.
In Norwalk, Connecticut, snow does not fall in May through October.
With an average of 15h and 6min of daylight, June has the longest days of the year in Norwalk.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Norwalk.
July is the warmest month, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 68.2°F (20.1°C).
The month with the most rainfall in Norwalk is July, when the rain falls for 18.1 days and typically aggregates up to 4.13" (105mm) of precipitation.
With an average of 10.5h of sunshine, July has the most sunshine of the year.
With an average ocean temperature of 73°F (22.8°C), August is the month with the warmest seawater.
With an average of 9h and 18min of daylight, December has the shortest days of the year.
Average temperature
Norwalk, CT
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (35.8°F).
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure
Norwalk, CT
- Average pressure in January:
30.05"Hg - Average pressure in February:
30.02"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
30.01"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.06"Hg
The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Norwalk, CT
- Average wind speed in January:
10.1mph - Average wind speed in February:
9.8mph - Average wind speed in March:
9.9mph - Average wind speed in April:
9.1mph - Average wind speed in May:
7.6mph - Average wind speed in June:
7mph
- Average wind speed in July:
6.5mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity
Norwalk, CT
The months with the highest relative humidity are February, May and June (76%).
The months with the lowest relative humidity are April and November (72%).
Average rainfall
Norwalk, CT
- Average rainfall in January:
2.36" - Average rainfall in February:
2.36" - Average rainfall in March:
2.8" - Average rainfall in April:
3.15" - Average rainfall in May:
3.11" - Average rainfall in June:
3.27"
- Average rainfall in July:
4.13" - Average rainfall in August:
3.54" - Average rainfall in September:
2.72" - Average rainfall in October:
3.5" - Average rainfall in November:
2.95" - Average rainfall in December:
3.98"
The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.36").
Average rainfall days
Norwalk, CT
- Average rainfall days in January:
8.3 days - Average rainfall days in February:
9.9 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
15.9 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
18.1 days - Average rainfall days in August:
16.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
12.2 days
The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (8.3 days).
Average snowfall
Norwalk, CT
The month with the highest snowfall is February (2.83").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Norwalk, CT
- Average snowfall days in January:
6.7 days - Average snowfall days in February:
7.4 days - Average snowfall days in March:
5 days - Average snowfall days in April:
0.7 days - Average snowfall days in May:
0.2 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
0.9 days - Average snowfall days in December:
3.6 days
The month with the highest number of snowfall days is February (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Norwalk, CT
The best month for swimming (with the highest average sea temperature) is August (73°F).
The coldest month (with the lowest average sea temperature) is February (39°F).
Average daylight / Average sunshine
Norwalk, CT
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 6min - Average sunshine in February:
4h and 42min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 24min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 42min - Average sunshine in December:
4h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).
Average sunshine days
Norwalk, CT
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
13.6 days - Average sunshine days in March:
14.6 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
11.3 days - Average sunshine days in August:
11.5 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
16.9 days - Average sunshine days in December:
15.4 days
The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10 days).
Average UV index
Norwalk, CT
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Norwalk, CT
The months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Norwalk, CT
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
