Climate and monthly weather forecastPort Jefferson, OH
Climate and monthly weather forecast
Weather in January
January, like December, in Port Jefferson, Ohio, is a wintry winter month, with temperature in the range of an average high of 32°F (0°C) and an average low of 20.1°F (-6.6°C). Port Jefferson's coldest month, January, generally records average temperatures ranging from a high of 32°F (0°C) to a low of 20.1°F (-6.6°C). Weather in January »Weather in February
The last month of the winter, February, is also a wintry month in Port Jefferson, Ohio, with an average temperature fluctuating between 23.7°F (-4.6°C) and 36.3°F (2.4°C). Port Jefferson signifies an average high-temperature of a still icy 36.3°F (2.4°C) in February, closely mirroring the 32°F (0°C) of January. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Port Jefferson, Ohio, with an average temperature varying between 47.5°F (8.6°C) and 32.5°F (0.3°C). The rise of average high-temperatures is seen in March, with an increase from an icy 36.3°F (2.4°C) in February to a chilly 47.5°F (8.6°C). Weather in March »Weather in April
April is a moderate spring month in Port Jefferson, Ohio, with temperature in the range of an average low of 42.6°F (5.9°C) and an average high of 59.5°F (15.3°C). As March gives way to April, the average high-temperature displays an increase, moving from a frosty 47.5°F (8.6°C) to a moderate 59.5°F (15.3°C). Weather in April »Weather in May
May, the last month of the spring in Port Jefferson, is a pleasant month, with an average temperature varying between 70.3°F (21.3°C) and 54°F (12.2°C). The shift into May is characterized by a rise in the average high-temperature, transitioning from April's moderate 59.5°F (15.3°C) to an agreeable 70.3°F (21.3°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Port Jefferson, Ohio, with an average temperature varying between 77.7°F (25.4°C) and 61°F (16.1°C). As Port Jefferson transitions into June, a marginal rise in the average high-temperature is observed, moving from an agreeable 70.3°F (21.3°C) in May to a moderately hot 77.7°F (25.4°C). Weather in June »Weather in July
July, like June, in Port Jefferson, Ohio, is a moderately hot summer month, with an average temperature fluctuating between 80.2°F (26.8°C) and 63.7°F (17.6°C). July proves to be the warmest month, recording an average peak temperature of 80.2°F (26.8°C) and a minimum temperature of 63.7°F (17.6°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Port Jefferson, Ohio, with an average temperature fluctuating between 79.2°F (26.2°C) and 61.3°F (16.3°C). August notes an average high-temperature of a still warm 79.2°F (26.2°C), subtly differing from July's 80.2°F (26.8°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Port Jefferson, Ohio, with an average temperature ranging between min 56.1°F (13.4°C) and max 73.6°F (23.1°C). The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from 79.2°F (26.2°C) to a still warm 73.6°F (23.1°C). Weather in September »Weather in October
October, the same as September, is another refreshing autumn month in Port Jefferson, Ohio, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 61.7°F (16.5°C). With October's arrival, Port Jefferson sees a decrease in average high-temperatures, moving from a moderately hot 73.6°F (23.1°C) in September to a comfortable 61.7°F (16.5°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Port Jefferson, Ohio, with an average temperature varying between 34.9°F (1.6°C) and 48.4°F (9.1°C). The onset of November comes with a shift in the average high-temperature, falling from a comfortable 61.7°F (16.5°C) in October to a chilly 48.4°F (9.1°C). Weather in November »Weather in December
December, the first month of the winter in Port Jefferson, is also an icy month, with temperature in the range of an average low of 27.5°F (-2.5°C) and an average high of 37.8°F (3.2°C). Port Jefferson's progression into December includes a drop in the average high-temperature, from a chilly 48.4°F (9.1°C) in November to a wintry 37.8°F (3.2°C). Weather in December »Updated: Jun 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
In Port Jefferson, the average lowest temperatures are observed in January, with a high of 32°F (0°C) and a low of 20.1°F (-6.6°C).
The months with the highest humidity are January, February and December, with an average relative humidity of 83%.
Throughout the year, there are 111.7 rainfall days, and 8.58" (218mm) of precipitation is accumulated.
Months with snowfall are January through May, October through December.
Throughout the year, there are 27.1 snowfall days, and 2.8" (71mm) of snow is accumulated.
The month with the least sunshine is January, with an average of 3.5h of sunshine.
The months with the lowest UV index in Port Jefferson are January, February, October through December, with an average maximum UV index of 2.
The month with the most snowfall is February, when snow falls for 6.8 days and typically aggregates up to 0.79" (20mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Port Jefferson, Ohio, 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 most rainfall are May and June, with an average 1.06" (27mm) of precipitation.
In Port Jefferson, snow does not fall in June through September.
With an average of 15h and 0min of daylight, June has the longest days of the year.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
July, on average, is the warmest month, registering a high temperature of 80.2°F (26.8°C) and a low of 63.7°F (17.6°C).
With an average of 10.1h of sunshine, July has the most sunshine of the year.
The least humid month is October, with an average relative humidity of 75%.
November is the month with the least rainfall. Rain falls for 6.2 days and accumulates 0.47" (12mm) of precipitation.
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
Port Jefferson, OH
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (32°F).
The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).
Average pressure
Port Jefferson, OH
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.04"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Port Jefferson, OH
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.4mph - Average wind speed in March:
9.8mph - Average wind speed in April:
10mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.8mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity
Port Jefferson, OH
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is October (75%).
Average rainfall
Port Jefferson, OH
- Average rainfall in January:
0.59" - Average rainfall in February:
0.59" - Average rainfall in March:
0.63" - Average rainfall in April:
0.75" - Average rainfall in May:
1.06" - Average rainfall in June:
1.06"
- Average rainfall in July:
0.91" - Average rainfall in August:
0.83" - Average rainfall in September:
0.51" - Average rainfall in October:
0.63" - Average rainfall in November:
0.47" - Average rainfall in December:
0.55"
The wettest months (with the highest rainfall) are May and June (1.06").
The driest month (with the least rainfall) is November (0.47").
Average rainfall days
Port Jefferson, OH
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
5 days - Average rainfall days in March:
9.9 days - Average rainfall days in April:
11.4 days - Average rainfall days in May:
13.2 days - Average rainfall days in June:
10.8 days
- Average rainfall days in July:
12.9 days - Average rainfall days in August:
10.8 days - Average rainfall days in September:
10.3 days - Average rainfall days in October:
7.9 days - Average rainfall days in November:
6.2 days - Average rainfall days in December:
7 days
The month with the highest number of rainy days is May (13.2 days).
The month with the least rainy days is February (5 days).
Average snowfall
Port Jefferson, OH
- Average snowfall in January:
0.63" - Average snowfall in February:
0.79" - Average snowfall in March:
0.31" - Average snowfall in April:
0.12" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is February (0.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Port Jefferson, OH
- Average snowfall days in January:
7.5 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.2 days - Average snowfall days in April:
1 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:
0.4 days - Average snowfall days in November:
1.9 days - Average snowfall days in December:
6.1 days
The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Port Jefferson, OH
- Average daylight in January:
9h and 42min - 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 24min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
3h and 30min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 54min - Average sunshine in June:
10h and 0min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 6min - Average sunshine in October:
6h and 18min - Average sunshine in November:
5h and 12min - Average sunshine in December:
3h and 54min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days
Port Jefferson, OH
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
18.2 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
16.2 days - Average sunshine days in May:
13.9 days - Average sunshine days in June:
14.8 days
- Average sunshine days in July:
13.6 days - Average sunshine days in August:
16.4 days - Average sunshine days in September:
17.2 days - Average sunshine days in October:
19.9 days - Average sunshine days in November:
21.8 days - Average sunshine days in December:
21 days
The month with the most sunshine days is November (21.8 days).
The month with the least sunshine days is July (13.6 days).
Average UV index
Port Jefferson, OH
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, October, November and December (UV index 2).
Average cloud cover
Port Jefferson, OH
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Port Jefferson, OH
The months with the highest visibility are January, February, March, April, May, June, July, October, November and December (6mi).
The months with the lowest visibility are August and September (5mi).
