Climate and monthly weather forecastStonington, CT
Climate and monthly weather forecast
The climate of Stonington
The climate in Stonington, Connecticut, USA, primarily falls under the Cfb classification, known as the marine west coast climate with warm summers, according to the Köppen climate classification system. Geographically, this town rests facing the Atlantic Coast, which influences its overall climatological patterns.Temperature fluctuations span a considerable range throughout the year. The highest average monthly high temperature is 77.9°F (25.5°C) in July while the lowest average monthly low is 26.6°F (-3°C) in January. Relative humidity is consistently significant, with fluctuations ranging from 74% in March to the highest value of 81% logged during June.
Precipitation in Stonington is fairly evenly distributed across the 12 months. The highest recorded average monthly rainfall is 3.86in in December and the lowest is 1.73in in September. The months with the most substantial snowfall, interestingly enough, are January and March with figures of 1.65in and 2.44in respectively. Conversely, the summer months typically see no snow according to the recorded data.
Stonington is relatively cloud-covered throughout the year. The least percentage of cloud cover, according to the yearly data, is 28% seen in August, while December pages the cloudiest month with an average of 47%. The stretch from the beginning of autumn until late winter tends to be the cloudiest period. Besides, the wind in Stonington maintains a steady speed between 8.1mph (13km/h) and 12.4mph (20km/h) annually.
The best time to visit Stonington
Stonington's climate and weather data suggest that the prime time for visitors to explore the town is during the summer months, particularly between June and August. Temperatures during these months stay comfortably warm, ranging from a maximum of 77.7°F (25.4°C) to 77.9°F (25.5°C) and a minimum from 66.4°F (19.1°C) to 70.9°F (21.6°C). This period commends itself as the best time to enjoy outdoor activities, with the maximum average daylight of 15.1 hours in June and maximum UV index of 6 between June and August.The worst time to visit Stonington
When considering the overall weather parameters, late autumn to early spring proves to be the least favorable time to visit Stonington. November to March sees lower temperatures, with the lowest annual average monthly temperature dipping to 26.6°F (-3°C) in January. This period records increased precipitation, with snowfall peaking in January with up to 1.65in. With decreased daylight hours to 9.6 in December and increasing cloud coverage, this period may not be ideal for outdoor activities and sightseeing.Spring weather in Stonington
Transitional weather characterizes spring in Stonington. After the winter's chill, temperatures rise significantly from an average high of 43.3°F (6.3°C) in March to 62.6°F (17°C) by May. Rainfall is quite frequent during spring, with an average of around 3" (76mm) per month and average rainfall days ranging from 12.6 in March to the year’s maximum of 16.6 days in May. Snowfall is minimal ending effectively in April.Summer weather in Stonington
Stonington's summer months from June to August offer warm and relatively dry conditions. Average maximum temperatures fluctuate around the mid-70s°F range, with the warmest being July at 77.9°F (25.5°C). Relative humidity during summer hovers around 81% in June to 78% in August. Rainfall totals are consistent, with an average of around 2.7" (69mm) in July. Additionally, days are long with an average of 10.5 hours of sunshine in June.Autumn weather in Stonington
Autumn in Stonington exhibits features of cooling temperatures and increasing rainfall. Average highs decrease from 71.4°F (21.9°C) in September to 51.3°F (10.7°C) in November. Rainfall sees an upward trend, reaching its annual peak of 3.43in in October. The length of days shorten, with daylight hours dwindling from 11.1 hours in October to 9.9 hours in November.Winter weather in Stonington
Winter in Stonington proves to be the coldest time of year with average high temperatures ranging from a chilly 42.3°F (5.7°C) in December to 36.5°F (2.5°C) in January. The winter months also record the lowest relative humidities of the year, at around 74% in December and March. Snowfall increases during the winter, reaching a height of 1.65in in January. The months of December and January receive the shortest daylight hours of the year, at 9.2 to 9.6 hours respectively.Weather in January
Starting the year in Stonington, Connecticut, January showcases improvements in the amount of daily sunshine as compared to the last month of the previous year. However, the city experiences its coldest phase during this time. The average temperature hovers from 26.6°F (-3°C) to 36.5°F (2.5°C), with the lowest visibility at 6 miles due to dense fog. Weather in January »Weather in February
Transitioning into February, the weather in Stonington sees a slightly warmer spectrum. This period observes less snowfall as compared to the preceding month. The rainfall averages at approximately 2.64" (67mm), offering an often damp ambiance. Weather in February »Weather in March
March marks a noticeable change in the weather of Stonington, displaying the initial hints of spring. Temperatures rise, paralleling an increase in rainfall, while the snowfall begins to cease. This period receives 2.95" (75mm) of average rainfall, the city's third wettest month. Weather in March »Weather in April
April represents a further nudge towards warmer weather in Stonington, showing a distinct transition from winter to spring. The city witnesses lesser rainfall compared to the previous month and a near absence of snowfall. More daylight hours start to brighten the city, enhancing its picturesque coastal scenery. Weather in April »Weather in May
May ushers in a pleasant season in Stonington, characterized by nice warmth and extended daylight hours. As residents bid farewell to chilly temperatures, the city begins to bask in the high-temperature band of approximately 62.6°F (17°C). Weather in May »Weather in June
With the beginning of June, Stonington experiences the true onset of summer. The temperature peaks towards the second half of the month, without any signs of rainfall or snowfall. The city boasts an average of 15.1 daylight hours, the maximum across the year. Weather in June »Weather in July
July reinforces the summer peak, with Stonington encountering the highest temperatures of the year. Warm days grace the city, reaching about 77.9°F (25.5°C), the highest average for the year. The warm seas and longer daylight hours enable various water sports and beach activities. Weather in July »Weather in August
August sustains the summer weather in Stonington, with warm and humid days a regular feature. The temperatures remain relatively steady, akin to the preceding month. The absence of snowfall and average rainfall contributes to the festive summer atmosphere. Weather in August »Weather in September
September heralds the outset of fall in Stonington, indicated by a dip in temperature. The drop in temperature complements the dwindling daylight hours, setting in a milder climate as compared to summer. The city receives the least amount of rainfall for the year at 1.73" (44mm), making it the driest month. Weather in September »Weather in October
October continues the fall vibe in Stonington, with a further recede in temperature. The city experiences a gradual shift towards cooler days, while rainfall amounts start to rise. The rainfall averages around 3.43" (87mm), making it the heaviest precipitation month of the year. Weather in October »Weather in November
November brings a colder weather front to Stonington, with a substantial descend in temperature. The fall foliage starts to fade away as winter gradually steps in. The initiating signs of snowfall can be witnessed at this time, with an average snowfall of about 0.28" (7mm). Weather in November »Weather in December
December marks the arrival of winter in Stonington, with temperatures dropping significantly. Snowfall shows a noticeable increase compared to November, enhancing the winter feels in the city. The city witnesses its shortest daylight hours during this month, contributing to the cold weather conditions. Weather in December »Updated: Aug 19, 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
In Stonington, the average lowest temperatures are observed in January, with a high of 36.5°F (2.5°C) and a low of 26.6°F (-3°C).
The months with the lowest humidity are January, March, April and November, with an average relative humidity of 74%.
Throughout the year, there are 166.1 rainfall days, and 34.09" (866mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
Throughout the year, there are 24.7 snowfall days, and 7.87" (200mm) of snow is accumulated.
January through March and December, with an average maximum UV index of 2, are months with the lowest UV index.
February and December, with an average of 4.9h of sunshine, are months with the least sunshine.
The month with the most snowfall is March, when snow falls for 5.3 days and typically aggregates up to 2.44" (62mm) of snow.
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.
May through September are months without snowfall.
June is the most humid month, with an average relative humidity of 81%.
With an average of 15h and 6min of daylight, June has the longest days of the year.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
During the warmest month in Stonington, July, temperatures average a high of 77.9°F (25.5°C) and a low of 66.9°F (19.4°C).
With an average of 10.6h of sunshine, August has the most sunshine of the year.
September is the month with the least rainfall. Rain falls for 12.8 days and accumulates 1.73" (44mm) of precipitation.
December is the month with the most rainfall. Rain falls for 13.4 days and accumulates 3.86" (98mm) of precipitation.
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Stonington, CT
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (36.5°F).
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).
Average pressure
Stonington, CT
- Average pressure in January:
30.02"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30.03"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:
29.95"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.05"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.04"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Stonington, CT
- Average wind speed in January:
12.4mph - Average wind speed in February:
12mph - Average wind speed in March:
12.1mph - Average wind speed in April:
11.1mph - Average wind speed in May:
9.6mph - Average wind speed in June:
8.6mph
- Average wind speed in July:
8.2mph - Average wind speed in August:
8.1mph - Average wind speed in September:
9.2mph - Average wind speed in October:
10.9mph - Average wind speed in November:
11.4mph - Average wind speed in December:
11.9mph
The windiest month (with the highest average wind speed) is January (12.4mph).
The calmest month (with the lowest average wind speed) is August (8.1mph).
Average humidity
Stonington, CT
The month with the highest relative humidity is June (81%).
The months with the lowest relative humidity are January, March, April and November (74%).
Average rainfall
Stonington, CT
- Average rainfall in January:
2.68" - Average rainfall in February:
2.64" - Average rainfall in March:
2.95" - Average rainfall in April:
3.23" - Average rainfall in May:
2.6" - Average rainfall in June:
2.83"
- Average rainfall in July:
2.72" - Average rainfall in August:
2.6" - Average rainfall in September:
1.73" - Average rainfall in October:
3.43" - Average rainfall in November:
2.83" - Average rainfall in December:
3.86"
The wettest month (with the highest rainfall) is December (3.86").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days
Stonington, CT
- Average rainfall days in January:
10.8 days - Average rainfall days in February:
10.1 days - Average rainfall days in March:
12.6 days - Average rainfall days in April:
16 days - Average rainfall days in May:
16.6 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
17.1 days - Average rainfall days in August:
16 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
14.1 days - Average rainfall days in November:
10.8 days - Average rainfall days in December:
13.4 days
The month with the highest number of rainy days is July (17.1 days).
The month with the least rainy days is February (10.1 days).
Average snowfall
Stonington, CT
The month with the highest snowfall is March (2.44").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Stonington, CT
- Average snowfall days in January:
6.8 days - Average snowfall days in February:
6.3 days - Average snowfall days in March:
5.3 days - Average snowfall days in April:
0.7 days - Average snowfall days in May:
0 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:
1 days - Average snowfall days in December:
4.5 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Stonington, CT
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - 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 12min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 12min - Average sunshine in April:
8h and 24min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
10h and 30min - Average sunshine in August:
10h and 36min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 12min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 54min).
Average sunshine days
Stonington, CT
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
12.8 days - Average sunshine days in March:
12.4 days - Average sunshine days in April:
12.4 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
11.7 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
15.2 days - Average sunshine days in October:
14.6 days - Average sunshine days in November:
16.5 days - Average sunshine days in December:
14.2 days
The month with the most sunshine days is November (16.5 days).
The months with the least sunshine days are June and July (11.7 days).
Average UV index
Stonington, 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 and December (UV index 2).
Average cloud cover
Stonington, CT
The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility
Stonington, 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).
