Climate and monthly weather forecastFairfax, SD
Climate and monthly weather forecast
Weather in January
January, the same as December, in Fairfax, South Dakota, is a freezing cold winter month, with temperature in the range of an average high of 27.3°F (-2.6°C) and an average low of 13.6°F (-10.2°C). January brings the lowest temperatures, with an average high of 27.3°F (-2.6°C) and an average low of 13.6°F (-10.2°C). Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Fairfax, South Dakota, with an average temperature varying between 31.5°F (-0.3°C) and 16.9°F (-8.4°C). During February, the average high-temperature is a still freezing cold 31.5°F (-0.3°C), maintaining a close resemblance to that of the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a frosty month in Fairfax, South Dakota, with an average temperature fluctuating between 46.9°F (8.3°C) and 30.4°F (-0.9°C). The start of March signals a clear increase in the average high-temperature, soaring from a freezing cold 31.5°F (-0.3°C) in February to a chilly 46.9°F (8.3°C). Weather in March »Weather in April
April in Fairfax, South Dakota, is a moderate spring month, with an average temperature fluctuating between 39.7°F (4.3°C) and 57.7°F (14.3°C). The start of April brings a rise in the average high-temperature, moving from a chilly 46.9°F (8.3°C) in March to a moderate 57.7°F (14.3°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Fairfax, South Dakota, with temperature in the range of an average low of 50.4°F (10.2°C) and an average high of 68.5°F (20.3°C). In May, the average high-temperature increases from a moderate 57.7°F (14.3°C) in April to a pleasant 68.5°F (20.3°C). Weather in May »Weather in June
June, the first month of the summer in Fairfax, is a warm month, with an average temperature fluctuating between 79.5°F (26.4°C) and 61.3°F (16.3°C). Fairfax's transition into June brings a rise in the average high-temperature, moving from an agreeable 68.5°F (20.3°C) in May to a moderately hot 79.5°F (26.4°C). Weather in June »Weather in July
July is a hot summer month in Fairfax, South Dakota, with temperature in the range of an average low of 65.7°F (18.7°C) and an average high of 86.5°F (30.3°C). The warmest period is July, when temperatures fluctuate between an average high of 86.5°F (30.3°C) and a low of 65.7°F (18.7°C). The heat index for July is evaluated at a very hot 95°F (35°C). Weather in July »Weather in August
August, the last month of the summer in Fairfax, is also a moderately hot month, with an average temperature varying between 62.8°F (17.1°C) and 85.1°F (29.5°C). In August, Fairfax's weather conditions record an average high-temperature of a warm 85.1°F (29.5°C), demonstrating little divergence from the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Fairfax, South Dakota, with an average temperature fluctuating between 55.4°F (13°C) and 76.3°F (24.6°C). September brings a slight decrease in temperature, down from 85.1°F (29.5°C) in August to a still warm 76.3°F (24.6°C). Weather in September »Weather in October
October, like September, is another mild autumn month in Fairfax, South Dakota, with an average temperature ranging between max 59.7°F (15.4°C) and min 42.4°F (5.8°C). October's arrival brings a noticeable temperature shift, dropping from a warm 76.3°F (24.6°C) in September to a mild 59.7°F (15.4°C). Weather in October »Weather in November
November, the last month of the autumn in Fairfax, is also a frosty month, with an average temperature varying between 46.4°F (8°C) and 30.9°F (-0.6°C). The onset of November comes with a shift in the average high-temperature, falling from a refreshing 59.7°F (15.4°C) in October to a frosty 46.4°F (8°C). Weather in November »Weather in December
The first month of the winter, December, is still a freezing cold month in Fairfax, South Dakota, with an average temperature varying between 30.4°F (-0.9°C) and 18.3°F (-7.6°C). December is characterized by a clear drop in the average high-temperature, falling from November's frosty 46.4°F (8°C) to a subzero cold 30.4°F (-0.9°C). Weather in December »Updated: Feb 14, 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
January stands out as Fairfax's coldest month, with an average high-temperature of 27.3°F (-2.6°C) and a low-temperature of 13.6°F (-10.2°C).
January is the most humid month in Fairfax, with an average relative humidity of 84%.
In Fairfax, South Dakota, during the entire year, the rain falls for 104.1 days and collects up to 14.29" (363mm) of precipitation.
Months with snowfall in Fairfax are January through April, October through December.
The months with the most snowfall are January and March, with an average 1.93" (49mm) of accumulated snow.
In Fairfax, South Dakota, during the entire year, snow falls for 32.8 days and aggregates up to 8.35" (212mm) of snow.
The month with the least sunshine in Fairfax is January, with an average of 4.7h of sunshine.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
February is the month with the least rainfall in Fairfax. Rain falls for 3.6 days and accumulates 0.31" (8mm) of precipitation.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Fairfax, 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.
The month with the most rainfall in Fairfax, South Dakota, is May, when the rain falls for 15.3 days and typically aggregates up to 2.72" (69mm) of precipitation.
In Fairfax, snow does not fall in May through September.
June has the longest days of the year in Fairfax, South Dakota, with an average of 15h and 18min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Fairfax.
July, having an average high-temperature of 86.5°F (30.3°C) and an average low-temperature of 65.7°F (18.7°C), is the warmest month.
The month with the most sunshine in Fairfax, South Dakota, is July, with an average of 11.1h of sunshine.
The least humid month in Fairfax is October, with an average relative humidity of 62%.
The month with the shortest days in Fairfax, South Dakota, is December, with an average of 9h and 6min of daylight.
Average temperature
Fairfax, SD
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (27.3°F).
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure
Fairfax, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.15"Hg - Average pressure in March:
30.05"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.91"Hg - Average pressure in June:
29.85"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.06"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 (29.85"Hg).
Average wind speed
Fairfax, SD
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11.1mph - Average wind speed in May:
9.6mph - Average wind speed in June:
8.9mph
- Average wind speed in July:
8.3mph - Average wind speed in August:
8.5mph - Average wind speed in September:
9.4mph - Average wind speed in October:
10.3mph - Average wind speed in November:
10.1mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is April (11.1mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).
Average humidity
Fairfax, SD
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (62%).
Average rainfall
Fairfax, SD
- Average rainfall in January:
0.39" - Average rainfall in February:
0.31" - Average rainfall in March:
0.98" - Average rainfall in April:
1.42" - Average rainfall in May:
2.72" - Average rainfall in June:
2.28"
- Average rainfall in July:
1.73" - Average rainfall in August:
1.46" - Average rainfall in September:
1.02" - Average rainfall in October:
1.02" - Average rainfall in November:
0.35" - Average rainfall in December:
0.59"
The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is February (0.31").
Average rainfall days
Fairfax, SD
- Average rainfall days in January:
2.9 days - Average rainfall days in February:
3.6 days - Average rainfall days in March:
8.8 days - Average rainfall days in April:
10.8 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
14.7 days
- Average rainfall days in July:
12.4 days - Average rainfall days in August:
11.3 days - Average rainfall days in September:
9.4 days - Average rainfall days in October:
7.7 days - Average rainfall days in November:
4.1 days - Average rainfall days in December:
3.1 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (2.9 days).
Average snowfall
Fairfax, SD
The months with the highest snowfall are January and March (1.93").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Fairfax, SD
- Average snowfall days in January:
8.2 days - Average snowfall days in February:
7.5 days - Average snowfall days in March:
5.2 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:
0.8 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
6.5 days
The month with the highest number of snowfall days is January (8.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Fairfax, SD
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 6min
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 42min - Average sunshine in February:
5h and 48min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 6min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 24min
- Average sunshine in July:
11h and 6min - Average sunshine in August:
10h and 30min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 36min - Average sunshine in November:
5h and 54min - Average sunshine in December:
4h and 54min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Fairfax, SD
- Average sunshine days in January:
20.9 days - Average sunshine days in February:
19.5 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
15.4 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
14.6 days - Average sunshine days in August:
16.7 days - Average sunshine days in September:
18.4 days - Average sunshine days in October:
20.7 days - Average sunshine days in November:
23.4 days - Average sunshine days in December:
22.5 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.3 days).
Average UV index
Fairfax, SD
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, November and December (UV index 2).
Average cloud cover
Fairfax, SD
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 23).
Average visibility
Fairfax, 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).
