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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 daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a frosty winter month in Jefferson, Oregon, with an average temperature fluctuating between 35.2°F (1.8°C) and 47.8°F (8.8°C). Jefferson notes an average high-temperature of a still frosty 47.8°F (8.8°C) in January, displaying minor variation from December. Weather in January »
Weather in February
February, the last month of the winter in Jefferson, is another chilly month, with an average temperature ranging between min 35.4°F (1.9°C) and max 48.7°F (9.3°C). The onset of February brings an average high-temperature of a still frosty 48.7°F (9.3°C), nearly matching the January temperature. Weather in February »
Weather in March
March, the first month of the spring in Jefferson, is a fresh month, with an average temperature varying between 37.2°F (2.9°C) and 52.9°F (11.6°C). Jefferson signifies an average high-temperature of a cool 52.9°F (11.6°C) in March, closely mirroring the 48.7°F (9.3°C) of February. Weather in March »
Weather in April
April in Jefferson, Oregon, is a moderate spring month, with an average temperature varying between 38.5°F (3.6°C) and 58.5°F (14.7°C). April showcases a minor temperature ascent, adjusting from March's cool 52.9°F (11.6°C) to a moderate 58.5°F (14.7°C). Weather in April »
Weather in May
May, the last month of the spring in Jefferson, is a comfortable month, with an average temperature varying between 42.4°F (5.8°C) and 65.8°F (18.8°C). Jefferson's weather in May shows a minor rise in the average high-temperature, moving slightly up from April's moderate 58.5°F (14.7°C) to a comfortable 65.8°F (18.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a pleasant month in Jefferson, Oregon, with an average temperature fluctuating between 46.8°F (8.2°C) and 71.4°F (21.9°C). Jefferson experiences a minor temperature shift with the start of June, with average high-temperatures moving from an enjoyable 65.8°F (18.8°C) in May to a pleasant 71.4°F (21.9°C). Weather in June »
Weather in July
July in Jefferson, Oregon, is a moderately hot summer month, with temperature in the range of an average high of 79.9°F (26.6°C) and an average low of 51.4°F (10.8°C). Jefferson's July weather indicates a minor ascent in high-temperatures, adjusting from a pleasant 71.4°F (21.9°C) in June to a warm 79.9°F (26.6°C). Weather in July »
Weather in August
August, the last month of the summer in Jefferson, is also a moderately hot month, with an average temperature ranging between max 81.9°F (27.7°C) and min 52.9°F (11.6°C). August is the month when Jefferson's temperatures reach their peak, with averages of 81.9°F (27.7°C) and lows of 52.9°F (11.6°C). The heat index value during August is appraised at a hot 86°F (30°C). Weather in August »
Weather in September
September, the first month of the autumn in Jefferson, is also a moderately hot month, with an average temperature varying between 50.2°F (10.1°C) and 73.8°F (23.2°C). In September, the average high-temperature marginally drops from a warm 81.9°F (27.7°C) in August to a still moderately hot 73.8°F (23.2°C). Weather in September »
Weather in October
October, like September, in Jefferson, Oregon, is another enjoyable autumn month, with an average temperature varying between 44.6°F (7°C) and 62.4°F (16.9°C). October's onset brings a reduction in the average high-temperature, from a moderately hot 73.8°F (23.2°C) in September to a comfortable 62.4°F (16.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Jefferson, is also a fresh month, with an average temperature fluctuating between 51.6°F (10.9°C) and 39.7°F (4.3°C). With the beginning of November, the average high-temperature shows a decrease, transitioning from a comfortable 62.4°F (16.9°C) in October to a fresh 51.6°F (10.9°C). Weather in November »
Weather in December
December, the first month of the winter in Jefferson, is also a frosty month, with an average temperature fluctuating between 45.5°F (7.5°C) and 34.5°F (1.4°C). In Jefferson, the lowest temperatures are generally noted in December, averaging a high of 45.5°F (7.5°C) and a low of 34.5°F (1.4°C). Weather in December »
Updated: Jun 20, 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
How many days does it rain?
In Jefferson, during the entire year, the rain falls for 164.2 days and collects up to 26.97" (685mm) of precipitation.
When does it snow?
January through March, November and December are months with snowfall.
How much does it snow?
In Jefferson, during the entire year, snow falls for 4.3 days and aggregates up to 2.64" (67mm) of snow.
When is the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month?
The months with the highest humidity are February and December, with an average relative humidity of 87%.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 1.9 days and accumulates 1.3" (33mm) 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.
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 PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
When it does not snow?
In Jefferson, snow does not fall in April through October.
When are the longest days?
With an average of 15h and 30min of daylight, June has the longest days of the year.
What is the driest month?
The month with the least rainfall is July, when the rain falls for 4 days and typically collects 0.24" (6mm) of precipitation.
When is the highest UV index in Jefferson?
July is the month with the highest UV index, with an average maximum UV index of 6.
What time of the year is the hottest?
August, characterized by an average high temperature of 81.9°F (27.7°C) and a low temperature of 52.9°F (11.6°C), is generally the warmest month.
What is the least humid month?
The least humid month is August, with an average relative humidity of 66%.
What month has the most sunshine?
August has the most sunshine of the year, with an average of 11.1h of sunshine.
What part of the year is the coldest?
Jefferson records the coldest temperatures in December, averaging a high of 45.5°F (7.5°C) and a low of 34.5°F (1.4°C).
What is the wettest month?
The month with the most rainfall is December, when the rain falls for 18.5 days and typically aggregates up to 3.98" (101mm) of precipitation.
What is the month with the shortest days in Jefferson?
The month with the shortest days is December, with an average of 8h and 54min of daylight.
Average temperature
Jefferson, OR
The warmest month (with the highest average high temperature) is August (81.9°F).
The month with the lowest average high temperature is December (45.5°F).
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).
Average pressure
Jefferson, OR
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.07"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.04"Hg
- Average pressure in July:
30.04"Hg - Average pressure in August:
30.01"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed
Jefferson, OR
- Average wind speed in January:
5mph - Average wind speed in February:
5mph - Average wind speed in March:
5.1mph - Average wind speed in April:
4.8mph - Average wind speed in May:
4.3mph - Average wind speed in June:
4.3mph
- Average wind speed in July:
4.3mph - Average wind speed in August:
4mph - Average wind speed in September:
4.1mph - Average wind speed in October:
4.6mph - Average wind speed in November:
5mph - Average wind speed in December:
4.9mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity
Jefferson, OR
The months with the highest relative humidity are February and December (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall
Jefferson, OR
- Average rainfall in January:
3.86" - Average rainfall in February:
2.99" - Average rainfall in March:
3.39" - Average rainfall in April:
2.6" - Average rainfall in May:
1.57" - Average rainfall in June:
1.14"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.39" - Average rainfall in September:
1.34" - Average rainfall in October:
2.4" - Average rainfall in November:
3.07" - Average rainfall in December:
3.98"
The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days
Jefferson, OR
- Average rainfall days in January:
17.7 days - Average rainfall days in February:
17 days - Average rainfall days in March:
20 days - Average rainfall days in April:
18.3 days - Average rainfall days in May:
12.4 days - Average rainfall days in June:
10.5 days
- Average rainfall days in July:
4 days - Average rainfall days in August:
3.9 days - Average rainfall days in September:
9.6 days - Average rainfall days in October:
14 days - Average rainfall days in November:
18.3 days - Average rainfall days in December:
18.5 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (3.9 days).
Average snowfall
Jefferson, OR
The month with the highest snowfall is February (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Jefferson, OR
- Average snowfall days in January:
0.8 days - Average snowfall days in February:
1.9 days - Average snowfall days in March:
1 days - Average snowfall days in April:
0 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 days - Average snowfall days in November:
0.1 days - Average snowfall days in December:
0.5 days
The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Jefferson, OR
- 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 2min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 4min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
11h and 0min - Average sunshine in August:
11h and 1min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
4h and 5min - Average sunshine in December:
4h and 2min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).
Average sunshine days
Jefferson, OR
- Average sunshine days in January:
11.8 days - Average sunshine days in February:
9 days - Average sunshine days in March:
9.8 days - Average sunshine days in April:
10.1 days - Average sunshine days in May:
16.3 days - Average sunshine days in June:
17.5 days
- Average sunshine days in July:
25.7 days - Average sunshine days in August:
24.7 days - Average sunshine days in September:
19.1 days - Average sunshine days in October:
15.5 days - Average sunshine days in November:
10.9 days - Average sunshine days in December:
10.7 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is February (9 days).
Average UV index
Jefferson, OR
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Jefferson, OR
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).
Average visibility
Jefferson, OR
The months with the highest visibility are July, August and September (6mi).
The month with the lowest visibility is February (4mi).
Jefferson, Oregon, USA
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