Climate and monthly weather forecastInterior, SD
Climate and monthly weather forecast
Weather in January
January, the same as December, in Interior, South Dakota, is a freezing cold winter month, with temperature in the range of an average low of 16.7°F (-8.5°C) and an average high of 29.8°F (-1.2°C). During the coldest month, January, temperatures average a high of 29.8°F (-1.2°C) and a low of 16.7°F (-8.5°C). Weather in January »Weather in February
February, the last month of the winter in Interior, is an icy month, with an average temperature varying between 32.9°F (0.5°C) and 18.5°F (-7.5°C). February's onset records an average high-temperature of an icy 32.9°F (0.5°C), a near match to January's 29.8°F (-1.2°C). Weather in February »Weather in March
March, the first month of the spring in Interior, is a frosty month, with temperature in the range of an average high of 46.8°F (8.2°C) and an average low of 30.6°F (-0.8°C). March's onset brings a rise in the average high-temperature, moving from an icy 32.9°F (0.5°C) in February to a chilly 46.8°F (8.2°C). Weather in March »Weather in April
April in Interior, South Dakota, is a mild spring month, with an average temperature varying between 56.5°F (13.6°C) and 38.7°F (3.7°C). In April, the meteorological conditions change with the average high-temperature moving from a frosty 46.8°F (8.2°C) in March to a moderate 56.5°F (13.6°C). Weather in April »Weather in May
The last month of the spring, May, is an agreeable month in Interior, South Dakota, with temperature in the range of an average low of 49.6°F (9.8°C) and an average high of 68.2°F (20.1°C). As April gives way to May, the average high-temperature displays an increase, moving from a refreshing 56.5°F (13.6°C) to an agreeable 68.2°F (20.1°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Interior, South Dakota, with an average temperature ranging between min 60.4°F (15.8°C) and max 81.3°F (27.4°C). June signals a shift in the average high-temperature, moving from May's pleasant 68.2°F (20.1°C) to a warm 81.3°F (27.4°C). Weather in June »Weather in July
July is a tropical summer month in Interior, South Dakota, with an average temperature ranging between max 89.2°F (31.8°C) and min 68.5°F (20.3°C). In Interior, temperatures reach their average annual highs in July, measuring 89.2°F (31.8°C) and a minimum average of 68.5°F (20.3°C). During July, the heat index is calculated to be a tropical 93.2°F (34°C). Weather in July »Weather in August
The last month of the summer, August, is another tropical month in Interior, South Dakota, with an average temperature varying between 87.1°F (30.6°C) and 66.9°F (19.4°C). August registers an average high-temperature of a still tropical 87.1°F (30.6°C), slightly varied from July's 89.2°F (31.8°C). Weather in August »Weather in September
September, the first month of the autumn in Interior, is also a moderately hot month, with an average temperature fluctuating between 77.5°F (25.3°C) and 58.3°F (14.6°C). Interior's progression into September includes a drop in the average high-temperature, from a hot 87.1°F (30.6°C) in August to a moderately hot 77.5°F (25.3°C). Weather in September »Weather in October
October, the same as September, in Interior, South Dakota, is a moderate autumn month, with temperature in the range of an average low of 43°F (6.1°C) and an average high of 59.2°F (15.1°C). In October, the average high-temperature decreases considerably from a moderately hot 77.5°F (25.3°C) in September to a refreshing 59.2°F (15.1°C). Weather in October »Weather in November
November, the last month of the autumn in Interior, is also a frosty month, with an average temperature fluctuating between 46.4°F (8°C) and 31.1°F (-0.5°C). The transition into November indicates a reduction in the average high-temperature, down to a chilly 46.4°F (8°C) from October's refreshing 59.2°F (15.1°C). Weather in November »Weather in December
The first month of the winter, December, is still a freezing cold month in Interior, South Dakota, with temperature in the range of an average high of 30.7°F (-0.7°C) and an average low of 18°F (-7.8°C). Interior's December weather is characterized by a distinct downswing in high-temperatures, falling from November's chilly 46.4°F (8°C) to a freezing cold 30.7°F (-0.7°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 brings the lowest temperatures in Interior, South Dakota, with an average high of 29.8°F (-1.2°C) and an average low of 16.7°F (-8.5°C).
The most humid month in Interior is January, with an average relative humidity of 81%.
January is the month with the least rainfall in Interior, South Dakota. Rain falls for 2.8 days and accumulates 0.39" (10mm) of precipitation.
Throughout the year, there are 95.3 rainfall days, and 13.74" (349mm) of precipitation is accumulated.
Months with snowfall are January through May, October through December.
Throughout the year, there are 38.8 snowfall days, and 16.1" (409mm) of snow is accumulated.
The months with the least sunshine are January and February, with an average of 5.2h of sunshine.
The month with the most snowfall is February, when snow falls for 8.9 days and typically aggregates up to 3.15" (80mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from MST to MDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from MDT to MST.
The month with the most rainfall is May, when the rain falls for 13.5 days and typically aggregates up to 2.09" (53mm) of precipitation.
In Interior, snow does not fall in June through September.
June has the longest days of the year in Interior, South Dakota, with an average of 15h and 24min of daylight.
July is the month when Interior, South Dakota, experiences its warmest temperatures, averaging a high of 89.2°F (31.8°C) and a low of 68.5°F (20.3°C).
The month with the highest UV index in Interior is July, with an average maximum UV index of 7.
The month with the most sunshine is August, with an average of 11.7h of sunshine.
With an average relative humidity of 47%, September is the least humid month in Interior, South Dakota.
The month with the shortest days is December, with an average of 9h and 0min of daylight.
The month with the lowest UV index in Interior is December, with an average maximum UV index of 1.
Average temperature
Interior, SD
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (29.8°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure
Interior, SD
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.14"Hg - Average pressure in March:
30.03"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:
29.9"Hg - Average pressure in August:
29.9"Hg - Average pressure in September:
29.94"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 (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed
Interior, SD
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.1mph - Average wind speed in March:
11mph - Average wind speed in April:
12.1mph - Average wind speed in May:
11.3mph - Average wind speed in June:
10.7mph
- Average wind speed in July:
10.3mph - Average wind speed in August:
10.2mph - Average wind speed in September:
11.1mph - Average wind speed in October:
11.5mph - Average wind speed in November:
10.5mph - Average wind speed in December:
10.3mph
The windiest month (with the highest average wind speed) is April (12.1mph).
The calmest month (with the lowest average wind speed) is February (10.1mph).
Average humidity
Interior, SD
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is September (47%).
Average rainfall
Interior, SD
- Average rainfall in January:
0.39" - Average rainfall in February:
0.55" - Average rainfall in March:
1.14" - Average rainfall in April:
1.57" - Average rainfall in May:
2.09" - Average rainfall in June:
1.69"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.18" - Average rainfall in September:
0.91" - Average rainfall in October:
1.14" - Average rainfall in November:
0.55" - Average rainfall in December:
0.71"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.39").
Average rainfall days
Interior, SD
- Average rainfall days in January:
2.8 days - Average rainfall days in February:
2.6 days - Average rainfall days in March:
6.5 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
13.5 days - Average rainfall days in June:
12.8 days
- Average rainfall days in July:
12.4 days - Average rainfall days in August:
10.8 days - Average rainfall days in September:
8.5 days - Average rainfall days in October:
7.2 days - Average rainfall days in November:
3.7 days - Average rainfall days in December:
2.7 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is February (2.6 days).
Average snowfall
Interior, SD
- Average snowfall in January:
2.09" - Average snowfall in February:
3.15" - Average snowfall in March:
3.07" - Average snowfall in April:
2.13" - Average snowfall in May:
0.75" - Average snowfall in June:
0"
The month with the highest snowfall is February (3.15").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Interior, SD
- Average snowfall days in January:
8.4 days - Average snowfall days in February:
8.9 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
3.3 days - Average snowfall days in May:
0.6 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:
1.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
6.9 days
The month with the highest number of snowfall days is February (8.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Interior, 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:
5h and 12min - Average sunshine in February:
5h and 12min - Average sunshine in March:
6h and 54min - Average sunshine in April:
9h and 0min - Average sunshine in May:
9h and 48min - Average sunshine in June:
11h and 0min
- Average sunshine in July:
11h and 36min - Average sunshine in August:
11h and 42min - Average sunshine in September:
9h and 54min - Average sunshine in October:
7h and 12min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 18min
The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days
Interior, SD
- Average sunshine days in January:
20.6 days - Average sunshine days in February:
17.5 days - Average sunshine days in March:
18.6 days - Average sunshine days in April:
14.1 days - Average sunshine days in May:
15 days - Average sunshine days in June:
14.1 days
- Average sunshine days in July:
15.5 days - Average sunshine days in August:
16.7 days - Average sunshine days in September:
18.8 days - Average sunshine days in October:
20.4 days - Average sunshine days in November:
20.8 days - Average sunshine days in December:
21.1 days
The month with the most sunshine days is December (21.1 days).
The months with the least sunshine days are April and June (14.1 days).
Average UV index
Interior, SD
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Interior, SD
The month with the most cloud cover is January (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility
Interior, 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).
