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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 another subzero cold winter month in Jefferson, South Dakota, with temperature in the range of an average low of 13.1°F (-10.5°C) and an average high of 27°F (-2.8°C). January stands out as Jefferson's coldest month, with temperatures ranging between an average high of 27°F (-2.8°C) and a low of 13.1°F (-10.5°C). Weather in January »
Weather in February
February, the last month of the winter in Jefferson, is another freezing cold month, with an average temperature ranging between max 30.7°F (-0.7°C) and min 16.7°F (-8.5°C). The transition from January to February sees an average high-temperature of a still subzero cold 30.7°F (-0.7°C), indicating a minor variance from the prior month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Jefferson, South Dakota, with an average temperature fluctuating between 46.6°F (8.1°C) and 30.9°F (-0.6°C). Jefferson in March experiences a marked increase in the average high-temperature, ascending from February's subzero cold 30.7°F (-0.7°C) to a frosty 46.6°F (8.1°C). Weather in March »
Weather in April
April is a moderate spring month in Jefferson, South Dakota, with an average temperature ranging between max 58.6°F (14.8°C) and min 40.8°F (4.9°C). April brings an increase in the average high-temperature, progressing from a frosty 46.6°F (8.1°C) in March to a mild 58.6°F (14.8°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Jefferson, South Dakota, with an average temperature varying between 52.2°F (11.2°C) and 69.4°F (20.8°C). As April transitions into May, a change in temperatures is observed, with average highs moving from a mild 58.6°F (14.8°C) to a pleasant 69.4°F (20.8°C). Weather in May »
Weather in June
June, the first month of the summer in Jefferson, is a moderately hot month, with an average temperature fluctuating between 79.9°F (26.6°C) and 62.2°F (16.8°C). The arrival of June brings an increase in high-temperatures, moving from a pleasant 69.4°F (20.8°C) in May to a moderately hot 79.9°F (26.6°C). Weather in June »
Weather in July
July, like June, in Jefferson, South Dakota, is another warm summer month, with an average temperature ranging between min 64.9°F (18.3°C) and max 84°F (28.9°C). The highest temperatures are recorded in July, with averages reaching a high of 84°F (28.9°C) and a low of 64.9°F (18.3°C). The heat index value during July is estimated at a tropical 91.4°F (33°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Jefferson, South Dakota, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 61.3°F (16.3°C). In August, Jefferson experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 84°F (28.9°C) in July to a still moderately hot 82°F (27.8°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Jefferson, South Dakota, with an average temperature fluctuating between 76.1°F (24.5°C) and 55°F (12.8°C). Jefferson's transition into September involves a gentle shift in temperature, receding from 82°F (27.8°C) in August to a still moderately hot 76.1°F (24.5°C). Weather in September »
Weather in October
October, the same as September, in Jefferson, South Dakota, is a moderate autumn month, with an average temperature varying between 43.3°F (6.3°C) and 59.9°F (15.5°C). As Jefferson transitions into October, a noticeable drop in the average high-temperature is observed, falling from a moderately hot 76.1°F (24.5°C) in September to a refreshing 59.9°F (15.5°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Jefferson, South Dakota, with an average temperature ranging between max 45.9°F (7.7°C) and min 31.5°F (-0.3°C). The onset of November is marked by a decrease in temperature, transitioning from a refreshing 59.9°F (15.5°C) in October to a chilly 45.9°F (7.7°C). Weather in November »
Weather in December
The first month of the winter, December, is also a subzero cold month in Jefferson, South Dakota, with an average temperature varying between 30.7°F (-0.7°C) and 18.7°F (-7.4°C). Jefferson sees a considerable decrease in average high-temperatures during December, falling from a frosty 45.9°F (7.7°C) in November to a subzero cold 30.7°F (-0.7°C). Weather in December »
Updated: Jun 8, 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 are the coldest months?
With average high and low temperatures of 27°F (-2.8°C) and 13.1°F (-10.5°C) respectively, January is Jefferson's coldest month.
What is the most humid month?
With an average relative humidity of 84%, January is the most humid month.
How much does it rain?
Throughout the year, there are 122 rainfall days, and 21.61" (549mm) of precipitation is accumulated.
When does it snow in Jefferson?
January through May, October through December are months with snowfall.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 9.6 days and accumulates 2.95" (75mm) of snow.
How much does it snow?
In Jefferson, South Dakota, during the entire year, snow falls for 38 days and aggregates up to 13.23" (336mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.4h of sunshine.
What is the month with the lowest UV index?
With an average maximum UV index of 1, January is the month with the lowest UV index.
What is the driest month?
February is the month with the least rainfall. Rain falls for 3.3 days and accumulates 0.67" (17mm) of precipitation.
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 CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the wettest month?
The wettest months are May and June, with an average 3.03" (77mm) of rainfall.
When it does not snow?
In Jefferson, snow does not fall in June through September.
When are the longest days?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What are the months with the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What is the warmest month?
July, known for its average high temperature of 84°F (28.9°C) and an average low temperature of 64.9°F (18.3°C), is the warmest month.
What month has the most sunshine?
July has the most sunshine of the year, with an average of 10.7h of sunshine.
What is the least humid month?
October is the least humid month, with an average relative humidity of 65%.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Jefferson, SD
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (27°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure
Jefferson, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.15"Hg - Average pressure in March:
30.06"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.86"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed
Jefferson, SD
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.5mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11.1mph - Average wind speed in May:
9.4mph - Average wind speed in June:
8.7mph
- Average wind speed in July:
7.6mph - Average wind speed in August:
8mph - Average wind speed in September:
9mph - Average wind speed in October:
10.2mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10.2mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (7.6mph).
Average humidity
Jefferson, SD
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (65%).
Average rainfall
Jefferson, SD
- Average rainfall in January:
0.75" - Average rainfall in February:
0.67" - Average rainfall in March:
1.69" - Average rainfall in April:
2.56" - Average rainfall in May:
3.03" - Average rainfall in June:
3.03"
- Average rainfall in July:
1.89" - Average rainfall in August:
2.2" - Average rainfall in September:
1.93" - Average rainfall in October:
1.85" - Average rainfall in November:
0.79" - Average rainfall in December:
1.22"
The wettest months (with the highest rainfall) are May and June (3.03").
The driest month (with the least rainfall) is February (0.67").
Average rainfall days
Jefferson, SD
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
13.3 days - Average rainfall days in May:
16.2 days - Average rainfall days in June:
17.8 days
- Average rainfall days in July:
12.7 days - Average rainfall days in August:
13.6 days - Average rainfall days in September:
11.8 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.1 days - Average rainfall days in December:
4.1 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is February (3.3 days).
Average snowfall
Jefferson, SD
- Average snowfall in January:
2.95" - Average snowfall in February:
2.36" - Average snowfall in March:
2.48" - Average snowfall in April:
1.61" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (2.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Jefferson, SD
- Average snowfall days in January:
9.6 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
5.3 days - Average snowfall days in April:
2.1 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:
0.7 days - Average snowfall days in November:
3.4 days - Average snowfall days in December:
8.4 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Jefferson, SD
- Average daylight in January:
9h and 3min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
5h and 2min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 5min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days
Jefferson, SD
- Average sunshine days in January:
19.2 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
15.6 days - Average sunshine days in April:
13.6 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
9.7 days
- Average sunshine days in July:
15 days - Average sunshine days in August:
14.7 days - Average sunshine days in September:
16.4 days - Average sunshine days in October:
18.7 days - Average sunshine days in November:
20.9 days - Average sunshine days in December:
20.1 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (9.7 days).
Average UV index
Jefferson, SD
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Jefferson, SD
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility
Jefferson, SD
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).
Jefferson, South Dakota, USA
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