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Contents
- The climate of Deer Isle
- The best time to visit Deer Isle
- The worst time to visit Deer Isle
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Deer Isle
Situated in Maine, USA, Deer Isle experiences a Humid continental climate (Dfb) according to the Köppen climate classification. This climate type signifies no dry season and predominantly warm summer months. The weather here witnesses considerable variations throughout the year with stark differences noticed in each weather parameter.
Plotting temperature trends, it is observed that a steady increase from 21°F (-6.1°C) to 59.9°F (15.5°C) occurs between the start and middle of the year, followed by a gradual decrease towards year-end. The highest temperatures, peaking at 68.7°F (20.4°C) to 68.9°F (20.5°C), mark July and August. Simultaneously, the coldest month is January, with temperatures dropping to 21°F (-6.1°C).
Rainfall in Deer Isle spreads consistently across the year, with the wettest month being October, receiving 2.09" (53mm) of rain. However, January and December also experience significant rainfall with an average of 1.89" (48mm). Between 8.4 and 12.8 days per month are typically rainfall days.
Speaking of other weather parameters, the sunshine hours per day range from 4.5 hours in December to the maximum of 10.4 hours in August. Similarly, daylight duration is minimum at 8.9 hours in December, while the longest daylight occurs in June and July, for approximately 15.1 to 15.5 hours daily.
Plotting temperature trends, it is observed that a steady increase from 21°F (-6.1°C) to 59.9°F (15.5°C) occurs between the start and middle of the year, followed by a gradual decrease towards year-end. The highest temperatures, peaking at 68.7°F (20.4°C) to 68.9°F (20.5°C), mark July and August. Simultaneously, the coldest month is January, with temperatures dropping to 21°F (-6.1°C).
Rainfall in Deer Isle spreads consistently across the year, with the wettest month being October, receiving 2.09" (53mm) of rain. However, January and December also experience significant rainfall with an average of 1.89" (48mm). Between 8.4 and 12.8 days per month are typically rainfall days.
Speaking of other weather parameters, the sunshine hours per day range from 4.5 hours in December to the maximum of 10.4 hours in August. Similarly, daylight duration is minimum at 8.9 hours in December, while the longest daylight occurs in June and July, for approximately 15.1 to 15.5 hours daily.
The best time to visit Deer Isle
The ideal time to visit Deer Isle is during late spring through summer, primarily from May to August. This period offers warmer temperatures (ranging from 55°F (12.8°C) to 68.9°F (20.5°C)) and longer daylight hours (between 14.8 and 15.5 hours), which enables visitors to engage in various outdoor activities. Additionally, ample sunshine, with up to 10.4 hours daily in August, provides a pleasant ambiance.
The worst time to visit Deer Isle
A chill sets over Deer Isle between December and February, with temperatures frequently falling below freezing. This, coupled with shorter daylight durations (between 8.9 and 10.5 hours) and significant snowfall of precipitation is accumulated. In Deer Isle, during the entire year, the rain falls for 115.5 days and collects up to 17.95" (456mm) of precipitation. January through April, October through December are months with snowfall. In Deer Isle, during January, snow falls for 7.7 days and regularly aggregates up to 1.89" (48mm) of snow. In Deer Isle, during the entire year, snow falls for 29.2 days and aggregates up to 9.65" (245mm) of snow. In Deer Isle, the average seawater temperature in January is 41.7°F (5.4°C).
Note: Diving into 41.7°F (5.4°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation. In January, the average length of the day is 9h and 19min.
On the first day of January, sunrise is at 7:10 am and sunset at 4:06 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 4:42 pm EST. The average sunshine in January is 4.8h. January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: In January, the UV index of 2 transforms into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Stay sun-safe with clothing that is both closely woven and worn loosely. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Note: Diving into 41.7°F (5.4°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation. In January, the average length of the day is 9h and 19min.
On the first day of January, sunrise is at 7:10 am and sunset at 4:06 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 4:42 pm EST. The average sunshine in January is 4.8h. January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for average individuals.
Note: In January, the UV index of 2 transforms into the following advice:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Stay sun-safe with clothing that is both closely woven and worn loosely. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Weather in February
The weather in February displays a slightly warmer average than that of January. With temperatures reaching low averages of 22.1°F (-5.5°C). Both residents and visitors should still be ready for the persistent chill in the air. Weather in February »
Weather in March
March experiences a noteworthy change in Deer Isle, Maine, as this period transitions the area from winter to spring. Compared to February, higher temperatures with an average of 37°F (2.8°C) indicate the onset of warming. However, late winter weather can still offer some chilly days. Weather in March »
Weather in April
April brings in the warmth of spring in Deer Isle, Maine, relieving the city from the long, cold winter. A rise in the average temperature to 46°F (7.8°C) signifies that the spring weather is in full swing. This rise in temperature also sees an increase in rain, typical of a spring climate. Weather in April »
Weather in May
May carries the essence of spring to its summit in Deer Isle, Maine. The climate starts to warm up drastically, with average temperatures hitting the fifty mark, around 55°F (12.8°C). The return of migratory birds, blooming flowers, and a general increase in biomass reflects the city’s transition into summer. Weather in May »
Weather in June
June introduces summer in Deer Isle, Maine. It starts registering temperatures in the sixties, specifically around 62.2°F (16.8°C), indicating the onset of the hot season. Outdoor lovers thrive during this month due to the warmer weather and longer daylight hours. Weather in June »
Weather in July
July is characterized by the most robust appearance of summer in Deer Isle, Maine. The high average temperature soars to 68.7°F (20.4°C), making July the hottest month of the year. On top of warm temperatures, there are significantly longer daylight hours, increasing outdoor activities. Weather in July »
Weather in August
August retains the summer charm in Deer Isle, Maine. Average temperatures remain similar to those in July at around 68.9°F (20.5°C), giving August status as a peak summer month. The adequate sunshine, combined with warm temperatures, makes it a favorable month for water-based activities. Weather in August »
Weather in September
Weather patterns in Deer Isle, Maine begin to change in September. A drop in temperature to an average of 63.9°F (17.7°C), signals the onset of the fall season. Even though temperatures begin to decrease, the weather remains comfortably warm for the better part of the month. Weather in September »
Weather in October
October establishes fall in its entire splendor in Deer Isle, Maine. Average temperatures take a dip to the fifties, about 54.9°F (12.7°C), confirming fall's firm grip. October is characterized by its colorful foliage, thus offering a fantastic destination for leaf-peeping. Weather in October »
Weather in November
November in Deer Isle, Maine, acts as a transition period from fall to the cold winter season. Average temperatures further drop to 45.3°F (7.4°C), indicating the ending snap of fall. The decrease in temperature and daylight hours signifies that winter is just around the corner. Weather in November »
Weather in December
December symbolizes the official start of the winter period in Deer Isle, Maine. Temperatures aggressively decline to an average of 36.7°F (2.6°C), making it the second coldest month. With shorter daylight hours and occasional snowfall, the city turns into a winter wonderland. Weather in December »
Updated: Aug 6, 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
What month is the coldest?
January, with its high-temperature average of 31.5°F (-0.3°C) and a low-temperature average of 21°F (-6.1°C), is the coldest month.
How much does it rain in Deer Isle?
Throughout the year, there are 115.5 rainfall days, and 17.95" (456mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
How much does it snow?
In Deer Isle, during the entire year, snow falls for 29.2 days and aggregates up to 9.65" (245mm) of snow.
What are the months with the lowest UV index?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
When does it snow the most?
The month with the most snowfall is February, when snow falls for 6.6 days and typically aggregates up to 2.32" (59mm) of snow.
What month is the ocean coldest?
The month with the coldest seawater is March, with an average ocean temperature of 38.3°F (3.5°C).
When is Daylight Saving Time (DST)?
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.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
With an average of 15h and 30min of daylight, June has the longest days of the year.
When is the highest UV index?
June through August, with an average maximum UV index of 5, are months with the highest UV index.
What is the most humid month?
The most humid month is July, with an average relative humidity of 85%.
What time of the year is the hottest?
August tends to be the warmest month, with temperatures averaging a daily high of 68.9°F (20.5°C) and a low of 59.9°F (15.5°C).
What month is the ocean warmest?
With an average ocean temperature of 58.6°F (14.8°C), August is the month with the warmest seawater.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.4h of sunshine.
What is the driest month?
The month with the least rainfall is September, when the rain falls for 8.7 days and typically collects 0.91" (23mm) of precipitation.
What is the rainiest month?
The month with the most rainfall is October, when the rain falls for 10.6 days and typically aggregates up to 2.09" (53mm) of precipitation.
What is the least humid month?
The least humid month is November, with an average relative humidity of 76%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 8h and 54min of daylight.
What is the month with the least sunshine?
The month with the least sunshine is December, with an average of 4.5h of sunshine.
Average temperature
Deer Isle, ME
The warmest month (with the highest average high temperature) is August (68.9°F).
The month with the lowest average high temperature is January (31.5°F).
The month with the highest average low temperature is August (59.9°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure
Deer Isle, ME
- Average pressure in January:
29.96"Hg - Average pressure in February:
29.95"Hg - Average pressure in March:
30"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.99"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.03"Hg - Average pressure in December:
30"Hg
The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Deer Isle, ME
- Average wind speed in January:
14.4mph - Average wind speed in February:
14mph - Average wind speed in March:
13.7mph - Average wind speed in April:
11.7mph - Average wind speed in May:
9.6mph - Average wind speed in June:
8.8mph
- Average wind speed in July:
7.8mph - Average wind speed in August:
7.8mph - Average wind speed in September:
9.2mph - Average wind speed in October:
11.8mph - Average wind speed in November:
13.1mph - Average wind speed in December:
13.9mph
The windiest month (with the highest average wind speed) is January (14.4mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).
Average humidity
Deer Isle, ME
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is November (76%).
Average rainfall
Deer Isle, ME
- Average rainfall in January:
1.54" - Average rainfall in February:
1.22" - Average rainfall in March:
1.14" - Average rainfall in April:
1.69" - Average rainfall in May:
1.34" - Average rainfall in June:
1.65"
- Average rainfall in July:
1.34" - Average rainfall in August:
1.26" - Average rainfall in September:
0.91" - Average rainfall in October:
2.09" - Average rainfall in November:
1.89" - Average rainfall in December:
1.89"
The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is September (0.91").
Average rainfall days
Deer Isle, ME
- Average rainfall days in January:
5.8 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
8.6 days - Average rainfall days in April:
11.7 days - Average rainfall days in May:
12 days - Average rainfall days in June:
12 days
- Average rainfall days in July:
12.8 days - Average rainfall days in August:
10.2 days - Average rainfall days in September:
8.7 days - Average rainfall days in October:
10.6 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
8.4 days
The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall
Deer Isle, ME
The month with the highest snowfall is February (2.32").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Deer Isle, ME
- Average snowfall days in January:
7.7 days - Average snowfall days in February:
6.6 days - Average snowfall days in March:
4.6 days - Average snowfall days in April:
1.8 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:
2.5 days - Average snowfall days in December:
5.9 days
The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average sea temperature
Deer Isle, ME
The best month for swimming (with the highest average sea temperature) is August (58.6°F).
The coldest month (with the lowest average sea temperature) is March (38.2°F).
Average daylight / Average sunshine
Deer Isle, ME
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 3min
- Average daylight in July:
15h and 1min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
4h and 5min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 1min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 3min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 3min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 4h and 30min).
Average sunshine days
Deer Isle, ME
- Average sunshine days in January:
17.9 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
17.5 days - Average sunshine days in April:
15.5 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
16.5 days
- Average sunshine days in July:
15.4 days - Average sunshine days in August:
19.3 days - Average sunshine days in September:
19.9 days - Average sunshine days in October:
17.8 days - Average sunshine days in November:
18 days - Average sunshine days in December:
16.3 days
The month with the most sunshine days is September (19.9 days).
The month with the least sunshine days is July (15.4 days).
Average UV index
Deer Isle, ME
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Deer Isle, ME
The months with the most cloud cover are February and March (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Deer Isle, ME
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).
Deer Isle, Maine, USA
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