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Contents
- Weather in January
- 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
Weather in January
January, the same as December, in Sullivan, Maine, is a freezing cold winter month, with temperature in the range of an average low of 18.5°F (-7.5°C) and an average high of 29.7°F (-1.3°C). Sullivan's January weather reaches an average high of 29.7°F (-1.3°C) and an average low of 18.5°F (-7.5°C), making it the coldest month. Weather in January »
Weather in February
February, the last month of the winter in Sullivan, is also a subzero cold month, with an average temperature fluctuating between 18.9°F (-7.3°C) and 30.7°F (-0.7°C). With the onset of February, the average high-temperature stands at a still freezing cold 30.7°F (-0.7°C), closely aligned with January's 29.7°F (-1.3°C). Weather in February »
Weather in March
The first month of the spring, March, is an icy month in Sullivan, Maine, with an average temperature ranging between max 37.2°F (2.9°C) and min 25.9°F (-3.4°C). The start of March is characterized by a subtle increase in the average high-temperature, transitioning from a freezing cold 30.7°F (-0.7°C) in February to a cold 37.2°F (2.9°C). Weather in March »
Weather in April
April in Sullivan, Maine, is a frosty spring month, with an average temperature fluctuating between 48.6°F (9.2°C) and 35.6°F (2°C). In April, the average high-temperature increases from an icy 37.2°F (2.9°C) in March to a frosty 48.6°F (9.2°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Sullivan, Maine, with an average temperature fluctuating between 44.2°F (6.8°C) and 58.6°F (14.8°C). Sullivan sees an increase in the average high-temperature with the arrival of May, moving from April's frosty 48.6°F (9.2°C) to a refreshing 58.6°F (14.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a refreshing month in Sullivan, Maine, with an average temperature ranging between min 51.4°F (10.8°C) and max 66°F (18.9°C). The transition from May to June brings a subtle temperature rise, with average high-temperatures increasing from a mild 58.6°F (14.8°C) to a still refreshing 66°F (18.9°C). Weather in June »
Weather in July
July in Sullivan, Maine, is an agreeable summer month, with temperature in the range of an average low of 58.1°F (14.5°C) and an average high of 73.2°F (22.9°C). July introduces a marginal temperature uplift, with average high-temperatures adjusting from June's comfortable 66°F (18.9°C) to an agreeable 73.2°F (22.9°C). Weather in July »
Weather in August
The last month of the summer, August, is a warm month in Sullivan, Maine, with an average temperature fluctuating between 57.7°F (14.3°C) and 73.4°F (23°C). The month of August sees the highest average temperatures, reaching 73.4°F (23°C) at the peak and 57.7°F (14.3°C) at the low. Weather in August »
Weather in September
September, the first month of the autumn in Sullivan, is also an enjoyable month, with temperature in the range of an average low of 52.7°F (11.5°C) and an average high of 67.1°F (19.5°C). In Sullivan, entering September brings a subtle temperature decrement, reducing from August's warm 73.4°F (23°C) to a comfortable 67.1°F (19.5°C). Weather in September »
Weather in October
October, the same as September, in Sullivan, Maine, is a moderate autumn month, with an average temperature ranging between max 55.9°F (13.3°C) and min 45°F (7.2°C). October's arrival comes with a decrease in the average high-temperature, moving from a comfortable 67.1°F (19.5°C) in September to a still refreshing 55.9°F (13.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Sullivan, Maine, with an average temperature ranging between max 44.8°F (7.1°C) and min 34.7°F (1.5°C). Sullivan's weather changes with the onset of November, slightly falling from a moderate 55.9°F (13.3°C) in October to a frosty 44.8°F (7.1°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Sullivan, Maine, with an average temperature varying between 35.1°F (1.7°C) and 25.7°F (-3.5°C). December brings a decrease in the average high-temperature, falling from November's chilly 44.8°F (7.1°C) to an icy 35.1°F (1.7°C). Weather in December »
Updated: Aug 22, 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?
Sullivan's coldest weather arrives in January, when temperatures average a high of 29.7°F (-1.3°C) and a low of 18.5°F (-7.5°C).
How many days does it rain?
Throughout the year, there are 142.1 rainfall days, and 32.28" (820mm) of precipitation is accumulated.
When does it snow?
January through May, October through December are months with snowfall.
How many days does it snow?
Throughout the year, in Sullivan, there are 48.1 snowfall days, and 23.82" (605mm) of snow is accumulated.
When is 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.
What is the most humid month?
The most humid month is February, with an average relative humidity of 83%.
When does it snow the most in Sullivan?
The month with the most snowfall is February, when snow falls for 11.4 days and typically aggregates up to 5.75" (146mm) of snow.
What is the month with the least sunshine?
With an average of 4.1h of sunshine, February has the least sunshine of the year.
What is the month with the coldest ocean?
With an average ocean temperature of 37.9°F (3.3°C), March is the month with the coldest seawater.
When is Daylight Saving Time (DST) in Sullivan?
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?
In Sullivan, snow does not fall in June through September.
When are the longest days?
The month with the longest days in Sullivan is June, with an average of 15h and 30min of daylight.
What is the month with 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 driest month?
The month with the least rainfall is July, when the rain falls for 13 days and typically collects 1.57" (40mm) of precipitation.
What is the warmest month?
With an average high-temperature of 73.4°F (23°C) and an average low-temperature of 57.7°F (14.3°C), August is the warmest month.
What is the month with the warmest ocean?
August is the month with the warmest seawater, with an average ocean temperature of 56.8°F (13.8°C).
What month has the most sunshine?
August has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the least humid month?
With an average relative humidity of 76%, November is the least humid month in Sullivan.
What is the rainiest month?
The month with the most rainfall is December, when the rain falls for 11.5 days and typically aggregates up to 3.94" (100mm) of precipitation.
What is the month with the shortest days?
With an average of 8h and 54min of daylight, December has the shortest days of the year.
Average temperature
Sullivan, ME
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure
Sullivan, ME
- Average pressure in January:
29.95"Hg - Average pressure in February:
29.94"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:
30.02"Hg - Average pressure in December:
29.99"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
Sullivan, ME
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.3mph - Average wind speed in April:
9.2mph - Average wind speed in May:
7.6mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.5mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity
Sullivan, ME
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is November (76%).
Average rainfall
Sullivan, ME
- Average rainfall in January:
3.19" - Average rainfall in February:
2.52" - Average rainfall in March:
2.44" - Average rainfall in April:
3.5" - Average rainfall in May:
2.28" - Average rainfall in June:
2.6"
- Average rainfall in July:
1.57" - Average rainfall in August:
1.73" - Average rainfall in September:
1.81" - Average rainfall in October:
3.35" - Average rainfall in November:
3.35" - Average rainfall in December:
3.94"
The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (1.57").
Average rainfall days
Sullivan, ME
- Average rainfall days in January:
8.1 days - Average rainfall days in February:
7.5 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
13 days - Average rainfall days in August:
10.4 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
14 days - Average rainfall days in November:
11.7 days - Average rainfall days in December:
11.5 days
The month with the highest number of rainy days is April (15.5 days).
The month with the least rainy days is February (7.5 days).
Average snowfall
Sullivan, ME
- Average snowfall in January:
5.31" - Average snowfall in February:
5.75" - Average snowfall in March:
4.13" - Average snowfall in April:
2.44" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sullivan, ME
- Average snowfall days in January:
11.8 days - Average snowfall days in February:
11.4 days - Average snowfall days in March:
9.4 days - Average snowfall days in April:
3.1 days - Average snowfall days in May:
0.1 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:
0.3 days - Average snowfall days in November:
4.1 days - Average snowfall days in December:
7.9 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Sullivan, ME
The best month for swimming (with the highest average sea temperature) is August (56.8°F).
The coldest month (with the lowest average sea temperature) is March (38°F).
Average daylight / Average sunshine
Sullivan, 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 3min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 1min - Average sunshine in April:
7h and 1min - Average sunshine in May:
7h and 5min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 1min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days
Sullivan, ME
- Average sunshine days in January:
14.4 days - Average sunshine days in February:
12.4 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
11.2 days - Average sunshine days in May:
14.5 days - Average sunshine days in June:
14.3 days
- Average sunshine days in July:
16.6 days - Average sunshine days in August:
18.7 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
14.5 days - Average sunshine days in November:
15.7 days - Average sunshine days in December:
14.1 days
The month with the most sunshine days is August (18.7 days).
The month with the least sunshine days is April (11.2 days).
Average UV index
Sullivan, 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
Sullivan, ME
The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility
Sullivan, ME
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Sullivan, Maine, USA
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