Climate and monthly weather forecastMellette, SD
Climate and monthly weather forecast
Weather in January
January, the same as December, in Mellette, South Dakota, is another subzero cold winter month, with an average temperature varying between 20.7°F (-6.3°C) and 6.3°F (-14.3°C). January is the coldest month, exhibiting average temperatures of 20.7°F (-6.3°C) at the peak and 6.3°F (-14.3°C) at the base. Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Mellette, South Dakota, with an average temperature ranging between min 9.1°F (-12.7°C) and max 23.7°F (-4.6°C). February's advent notes a subtle adjustment in average high-temperature to a still freezing cold 23.7°F (-4.6°C) from January. Weather in February »Weather in March
The first month of the spring, March, is an icy month in Mellette, South Dakota, with an average temperature ranging between max 39.7°F (4.3°C) and min 24.8°F (-4°C). A clear rise in the average high-temperature is observed during March, increasing from a subzero cold 23.7°F (-4.6°C) in February to a cold 39.7°F (4.3°C). Weather in March »Weather in April
April in Mellette, South Dakota, is a fresh spring month, with an average temperature varying between 36.9°F (2.7°C) and 54.1°F (12.3°C). As April begins, there is a noticeable increase in the average high-temperature, soaring from a cold 39.7°F (4.3°C) in March to a cool 54.1°F (12.3°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Mellette, South Dakota, with an average temperature fluctuating between 48.2°F (9°C) and 66.7°F (19.3°C). As April transitions into May, a change in temperatures is observed, with average highs moving from a cool 54.1°F (12.3°C) to a refreshing 66.7°F (19.3°C). Weather in May »Weather in June
June, the first month of the summer in Mellette, is a warm month, with an average temperature ranging between max 76.8°F (24.9°C) and min 57.6°F (14.2°C). The shift into June is marked by a rise in the average high-temperature, moving from May's refreshing 66.7°F (19.3°C) to a moderately hot 76.8°F (24.9°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Mellette, South Dakota, with an average temperature ranging between max 84.7°F (29.3°C) and min 63.1°F (17.3°C). Mellette's July weather reaches an average high of 84.7°F (29.3°C) and an average low of 63.1°F (17.3°C), making it the warmest month. For July, the heat index is calculated to be a hot 89.6°F (32°C). Weather in July »Weather in August
August, the last month of the summer in Mellette, is another warm month, with an average temperature varying between 61°F (16.1°C) and 83.1°F (28.4°C). August welcomes an average high-temperature of a still moderately hot 83.1°F (28.4°C), not much different from the preceding month. Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Mellette, South Dakota, with an average temperature ranging between max 74.3°F (23.5°C) and min 52.9°F (11.6°C). As Mellette enters September, the average high-temperature subtly lowers from the 83.1°F (28.4°C) of August to a still moderately hot 74.3°F (23.5°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Mellette, South Dakota, with an average temperature ranging between max 56.3°F (13.5°C) and min 40.1°F (4.5°C). As Mellette steps into October, the average high-temperature decreases significantly from the a warm 74.3°F (23.5°C) of September to a refreshing 56.3°F (13.5°C). Weather in October »Weather in November
The last month of the autumn, November, is also an icy month in Mellette, South Dakota, with an average temperature ranging between min 26.8°F (-2.9°C) and max 41.7°F (5.4°C). As November begins, there is a noticeable decrease in the average high-temperature, falling from a mild 56.3°F (13.5°C) in October to an icy 41.7°F (5.4°C). Weather in November »Weather in December
The first month of the winter, December, is also a subzero cold month in Mellette, South Dakota, with an average temperature ranging between min 12.7°F (-10.7°C) and max 25°F (-3.9°C). Mellette sees a considerable decrease in average high-temperatures during December, falling from a cold 41.7°F (5.4°C) in November to a freezing cold 25°F (-3.9°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
Mellette's coldest month, January, registers temperatures that range from a high of 20.7°F (-6.3°C) to a low of 6.3°F (-14.3°C).
January is the most humid month in Mellette, with an average relative humidity of 88%.
The month with the least rainfall in Mellette, South Dakota, is January, when the rain falls for 3 days and typically collects 0.59" (15mm) of precipitation.
Throughout the year, in Mellette, there are 97.2 rainfall days, and 18.35" (466mm) of precipitation is accumulated.
January through May, October through December are months with snowfall in Mellette, South Dakota.
The month with the most snowfall in Mellette, South Dakota, is January, when snow falls for 13 days and typically aggregates up to 3.82" (97mm) of snow.
Throughout the year, there are 54.8 snowfall days, and 19.13" (486mm) of snow is accumulated.
With an average of 3.9h of sunshine, January has the least sunshine of the year in Mellette, South Dakota.
January, February and November, with an average maximum UV index of 1, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Mellette, South Dakota, 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 June, when the rain falls for 15 days and typically aggregates up to 3.46" (88mm) of precipitation.
In Mellette, South Dakota, snow does not fall in June through September.
The month with the longest days in Mellette is June, with an average of 15h and 36min of daylight.
June through August, with an average maximum UV index of 6, are months with the highest UV index in Mellette.
July, with its high-temperature average of 84.7°F (29.3°C) and a low-temperature average of 63.1°F (17.3°C), is the warmest month in Mellette, South Dakota.
July has the most sunshine of the year, with an average of 11.1h of sunshine.
August and September, with an average relative humidity of 60%, are the least humid months.
December has the shortest days of the year, with an average of 8h and 48min of daylight.
Average temperature
Mellette, SD
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (20.7°F).
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (6.3°F).
Average pressure
Mellette, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.17"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.95"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:
29.91"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 month with the highest atmospheric pressure is February (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Mellette, SD
- Average wind speed in January:
9.5mph - Average wind speed in February:
9.4mph - Average wind speed in March:
9.7mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9.7mph - Average wind speed in June:
8.9mph
- Average wind speed in July:
8.4mph - Average wind speed in August:
8.3mph - Average wind speed in September:
9.6mph - Average wind speed in October:
10.4mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.5mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity
Mellette, SD
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are August and September (60%).
Average rainfall
Mellette, SD
- Average rainfall in January:
0.59" - Average rainfall in February:
0.63" - Average rainfall in March:
1.1" - Average rainfall in April:
1.65" - Average rainfall in May:
2.32" - Average rainfall in June:
3.46"
- Average rainfall in July:
2.6" - Average rainfall in August:
1.61" - Average rainfall in September:
1.26" - Average rainfall in October:
1.61" - Average rainfall in November:
0.63" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days
Mellette, SD
- Average rainfall days in January:
3 days - Average rainfall days in February:
2 days - Average rainfall days in March:
7.1 days - Average rainfall days in April:
10.2 days - Average rainfall days in May:
13 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
12.2 days - Average rainfall days in August:
10.4 days - Average rainfall days in September:
8.9 days - Average rainfall days in October:
7.8 days - Average rainfall days in November:
4.5 days - Average rainfall days in December:
3.1 days
The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is February (2 days).
Average snowfall
Mellette, SD
- Average snowfall in January:
3.82" - Average snowfall in February:
3.7" - Average snowfall in March:
3.19" - Average snowfall in April:
2.32" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is January (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Mellette, SD
- Average snowfall days in January:
13 days - Average snowfall days in February:
10.9 days - Average snowfall days in March:
8.7 days - Average snowfall days in April:
3.3 days - Average snowfall days in May:
0.3 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:
2.1 days - Average snowfall days in November:
5.1 days - Average snowfall days in December:
11.4 days
The month with the highest number of snowfall days is January (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Mellette, SD
- Average daylight in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 54min - Average daylight in June:
15h and 36min
- Average daylight in July:
15h and 12min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 48min - Average sunshine in March:
5h and 30min - Average sunshine in April:
7h and 42min - 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 42min - Average sunshine in October:
6h and 24min - Average sunshine in November:
5h and 18min - Average sunshine in December:
4h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Mellette, SD
- Average sunshine days in January:
17.2 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
16.4 days - Average sunshine days in April:
15.5 days - Average sunshine days in May:
15.7 days - Average sunshine days in June:
12.7 days
- Average sunshine days in July:
16.8 days - Average sunshine days in August:
18.2 days - Average sunshine days in September:
18.7 days - Average sunshine days in October:
19.8 days - Average sunshine days in November:
20.9 days - Average sunshine days in December:
18.9 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is June (12.7 days).
Average UV index
Mellette, 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 and November (UV index 1).
Average cloud cover
Mellette, SD
The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are July and August (Cloud cover 23).
Average visibility
Mellette, SD
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
