Climate and monthly weather forecastMount Vernon, SD
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Mount Vernon, South Dakota, with an average temperature varying between 24.4°F (-4.2°C) and 10.2°F (-12.1°C). January, on average, is the coldest month, registering a high temperature of 24.4°F (-4.2°C) and a low of 10.2°F (-12.1°C). Weather in January »Weather in February
The last month of the winter, February, is also a subzero cold month in Mount Vernon, South Dakota, with temperature in the range of an average high of 28.6°F (-1.9°C) and an average low of 14.2°F (-9.9°C). February's presence marks an average high-temperature of a still freezing cold 28.6°F (-1.9°C), subtly varied from January's 24.4°F (-4.2°C). Weather in February »Weather in March
March, the first month of the spring in Mount Vernon, is a chilly month, with an average temperature fluctuating between 27.9°F (-2.3°C) and 44.4°F (6.9°C). The arrival of March is marked by a notable increase in high-temperatures, climbing from a subzero cold 28.6°F (-1.9°C) in February to a frosty 44.4°F (6.9°C). Weather in March »Weather in April
April in Mount Vernon, South Dakota, is a refreshing spring month, with temperature in the range of an average high of 56.8°F (13.8°C) and an average low of 38.8°F (3.8°C). The shift into April is accompanied by a temperature increase, with the average high-temperature rising from a frosty 44.4°F (6.9°C) in March to a moderate 56.8°F (13.8°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in Mount Vernon, South Dakota, with an average temperature ranging between max 68.4°F (20.2°C) and min 50°F (10°C). May's arrival signals a temperature shift, moving from a moderate 56.8°F (13.8°C) in April to a pleasant 68.4°F (20.2°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Mount Vernon, South Dakota, with an average temperature ranging between max 79°F (26.1°C) and min 60.3°F (15.7°C). Mount Vernon's transition into June sees a rise in the average high-temperature, advancing from a pleasant 68.4°F (20.2°C) in May to a moderately hot 79°F (26.1°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Mount Vernon, South Dakota, with an average temperature fluctuating between 85.6°F (29.8°C) and 64.6°F (18.1°C). July, on average, is the warmest month, registering a high temperature of 85.6°F (29.8°C) and a low of 64.6°F (18.1°C). For July, the heat index is calculated to be a tropical 93.2°F (34°C). Weather in July »Weather in August
August, the last month of the summer in Mount Vernon, is another warm month, with an average temperature varying between 62.1°F (16.7°C) and 84.4°F (29.1°C). The start of August sees the average high-temperature at a still warm 84.4°F (29.1°C), showing little difference from July's 85.6°F (29.8°C). Weather in August »Weather in September
September, the first month of the autumn in Mount Vernon, is also a moderately hot month, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 76.1°F (24.5°C). The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from 84.4°F (29.1°C) to a still warm 76.1°F (24.5°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Mount Vernon, South Dakota, with an average temperature varying between 42.1°F (5.6°C) and 58.5°F (14.7°C). A noticeable downshift in temperatures is seen as September gives way to October, with average highs moving from a warm 76.1°F (24.5°C) to a mild 58.5°F (14.7°C). Weather in October »Weather in November
November, the last month of the autumn in Mount Vernon, is another chilly month, with an average temperature ranging between min 29.5°F (-1.4°C) and max 45°F (7.2°C). As October shifts into November, a slight alteration in temperatures is observed, with average highs reducing from a refreshing 58.5°F (14.7°C) to a frosty 45°F (7.2°C). Weather in November »Weather in December
December, the first month of the winter in Mount Vernon, is also a subzero cold month, with an average temperature varying between 16°F (-8.9°C) and 28.6°F (-1.9°C). December signals a significant shift in the average high-temperature, falling from November's frosty 45°F (7.2°C) to a subzero cold 28.6°F (-1.9°C). Weather in December »Updated: Aug 11, 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
Mount Vernon's coldest month, January, generally records average temperatures ranging from a high of 24.4°F (-4.2°C) to a low of 10.2°F (-12.1°C).
The most humid month is January, with an average relative humidity of 87%.
In Mount Vernon, during the entire year, the rain falls for 93.2 days and collects up to 11.3" (287mm) of precipitation.
January through April, October through December are months with snowfall.
Throughout the year, there are 35.3 snowfall days, and 7.17" (182mm) of snow is accumulated.
With an average of 4.4h of sunshine, January has the least sunshine of the year.
The month with the lowest UV index is January, with an average maximum UV index of 1.
February and November are months with the least rain when the rain falls for 1.9 days and typically aggregates up to 0.28" (7mm) of rain.
February is the month with the most snowfall. Snow falls for 7.3 days and accumulates 1.42" (36mm) of snow.
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.
The month with the most rainfall is May, when the rain falls for 13.5 days and typically aggregates up to 1.65" (42mm) of precipitation.
May through September are months without snowfall in Mount Vernon.
June has the longest days of the year, with an average of 15h and 24min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
July is the month that records the highest temperatures, with averages ranging from a high of 85.6°F (29.8°C) to a low of 64.6°F (18.1°C).
The month with the most sunshine is July, with an average of 11.1h of sunshine.
September and October, with an average relative humidity of 63%, are the least humid months.
December has the shortest days of the year, with an average of 9h and 0min of daylight.
Average temperature
Mount Vernon, SD
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (24.4°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (10.2°F).
Average pressure
Mount Vernon, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.16"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:
29.85"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
29.98"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.13"Hg
The months with the highest atmospheric pressure are January and February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Mount Vernon, SD
- Average wind speed in January:
10.3mph - Average wind speed in February:
10.3mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11.2mph - Average wind speed in May:
9.8mph - Average wind speed in June:
9.2mph
- Average wind speed in July:
8.6mph - Average wind speed in August:
8.7mph - Average wind speed in September:
9.7mph - Average wind speed in October:
10.6mph - Average wind speed in November:
10.3mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).
Average humidity
Mount Vernon, SD
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are September and October (63%).
Average rainfall
Mount Vernon, SD
- Average rainfall in January:
0.31" - Average rainfall in February:
0.28" - Average rainfall in March:
0.83" - Average rainfall in April:
1.18" - Average rainfall in May:
1.65" - Average rainfall in June:
1.61"
- Average rainfall in July:
1.54" - Average rainfall in August:
1.14" - Average rainfall in September:
1.18" - Average rainfall in October:
0.79" - Average rainfall in November:
0.28" - Average rainfall in December:
0.51"
The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are February and November (0.28").
Average rainfall days
Mount Vernon, SD
- Average rainfall days in January:
2.6 days - Average rainfall days in February:
1.9 days - Average rainfall days in March:
7.2 days - Average rainfall days in April:
11.3 days - Average rainfall days in May:
13.5 days - Average rainfall days in June:
13.6 days
- Average rainfall days in July:
10.5 days - Average rainfall days in August:
10.5 days - Average rainfall days in September:
9.2 days - Average rainfall days in October:
6.8 days - Average rainfall days in November:
3.2 days - Average rainfall days in December:
2.9 days
The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is February (1.9 days).
Average snowfall
Mount Vernon, SD
The month with the highest snowfall is February (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Mount Vernon, SD
- Average snowfall days in January:
8.7 days - Average snowfall days in February:
7.3 days - Average snowfall days in March:
5.4 days - Average snowfall days in April:
2.6 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:
0.9 days - Average snowfall days in November:
2.8 days - Average snowfall days in December:
7.5 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Mount Vernon, SD
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 24min
- Average daylight in July:
15h and 6min - 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 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
4h and 24min - Average sunshine in February:
5h and 24min - Average sunshine in March:
6h and 18min - Average sunshine in April:
8h and 0min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 18min
- Average sunshine in July:
11h and 6min - Average sunshine in August:
10h and 42min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 30min - Average sunshine in November:
5h and 48min - Average sunshine in December:
4h and 42min
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 24min).
Average sunshine days
Mount Vernon, SD
- Average sunshine days in January:
21.6 days - Average sunshine days in February:
19.8 days - Average sunshine days in March:
18.3 days - Average sunshine days in April:
14.8 days - Average sunshine days in May:
14 days - Average sunshine days in June:
12.8 days
- Average sunshine days in July:
17.8 days - Average sunshine days in August:
17.3 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
22 days - Average sunshine days in November:
23.4 days - Average sunshine days in December:
21.9 days
The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is June (12.8 days).
Average UV index
Mount Vernon, SD
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Mount Vernon, SD
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 22).
Average visibility
Mount Vernon, 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).
