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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, the same as December, in Iona, South Dakota, is a freezing cold winter month, with an average temperature varying between 26.1°F (-3.3°C) and 12.6°F (-10.8°C). January, characterized by an average high temperature of 26.1°F (-3.3°C) and a low temperature of 12.6°F (-10.8°C), is generally the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Iona, South Dakota, with an average temperature fluctuating between 29.8°F (-1.2°C) and 15.3°F (-9.3°C). Iona, South Dakota, greets February with an average high-temperature of a still freezing cold 29.8°F (-1.2°C), marking a slight deviation from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Iona, South Dakota, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 29.1°F (-1.6°C). A shift in Iona's weather is noticeable as February turns into March, with the average high temperature increases from a freezing cold 29.8°F (-1.2°C) to a frosty 45°F (7.2°C). Weather in March »
Weather in April
April in Iona, South Dakota, is a moderate spring month, with an average temperature fluctuating between 56.3°F (13.5°C) and 38.3°F (3.5°C). The commencement of April sees a shift in the average high-temperature, moving from a frosty 45°F (7.2°C) in March to a moderate 56.3°F (13.5°C). Weather in April »
Weather in May
May, the last month of the spring in Iona, is a comfortable month, with an average temperature fluctuating between 49.3°F (9.6°C) and 67.8°F (19.9°C). May's onset witnesses a shift in the average high-temperature, moving from a moderate 56.3°F (13.5°C) in April to a comfortable 67.8°F (19.9°C). Weather in May »
Weather in June
June, the first month of the summer in Iona, is a moderately hot month, with an average temperature varying between 60.4°F (15.8°C) and 79.7°F (26.5°C). Iona in June experiences an increase in the average high-temperature, moving from May's refreshing 67.8°F (19.9°C) to a moderately hot 79.7°F (26.5°C). Weather in June »
Weather in July
July is a hot summer month in Iona, South Dakota, with an average temperature ranging between min 66.2°F (19°C) and max 88°F (31.1°C). Iona's temperatures tend to reach their peak averages in July, with a high of 88°F (31.1°C) and a low of 66.2°F (19°C). The heat index for July is evaluated at a sweltering 95°F (35°C). Weather in July »
Weather in August
August, the last month of the summer in Iona, is also a moderately hot month, with an average temperature varying between 85.8°F (29.9°C) and 63.7°F (17.6°C). Iona observes an average high-temperature of a moderately hot 85.8°F (29.9°C) in August, barely different from 88°F (31.1°C) in July. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Iona, South Dakota, with temperature in the range of an average high of 76.3°F (24.6°C) and an average low of 55.9°F (13.3°C). As Iona enters September, the average high-temperature decreases from the 85.8°F (29.9°C) of August to a still moderately hot 76.3°F (24.6°C). Weather in September »
Weather in October
October, the same as September, in Iona, South Dakota, is another refreshing autumn month, with an average temperature varying between 58.6°F (14.8°C) and 42.4°F (5.8°C). Iona's transition into October is marked by a distinct drop in the average high-temperature, reducing from a warm 76.3°F (24.6°C) in September to a mild 58.6°F (14.8°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Iona, South Dakota, with an average temperature varying between 45.5°F (7.5°C) and 29.7°F (-1.3°C). The transition into November involves a decrease in the average high-temperature, falling from a mild 58.6°F (14.8°C) in October to a frosty 45.5°F (7.5°C). Weather in November »
Weather in December
December, the first month of the winter in Iona, is still a freezing cold month, with an average temperature ranging between min 16.9°F (-8.4°C) and max 29.1°F (-1.6°C). December indicates a noticeable reduction in the average high-temperature, moving down from a chilly 45.5°F (7.5°C) in November to a subzero cold 29.1°F (-1.6°C). Weather in December »
[Resources]Frequently asked questions
What are the coldest months in Iona?
January tends to be the coldest month in Iona, South Dakota, with temperatures averaging a daily high of 26.1°F (-3.3°C) and a low of 12.6°F (-10.8°C).
What is the most humid month in Iona?
The most humid month is January, with an average relative humidity of 86%.
How much does it rain in Iona?
Throughout the year, there are 107.6 rainfall days, and 17.83" (453mm) of precipitation is accumulated.
When does it snow in Iona?
January through April, October through December are months with snowfall.
How much does it snow in Iona?
In Iona, during the entire year, snow falls for 50.9 days and aggregates up to 17.87" (454mm) of snow.
What is the month with the least sunshine in Iona?
The month with the least sunshine in Iona, South Dakota, is January, with an average of 4.7h of sunshine.
When does it snow the most in Iona?
The month with the most snowfall in Iona is February, when snow falls for 11.7 days and typically aggregates up to 3.66" (93mm) of snow.
When is the lowest UV index in Iona?
February is the month with the lowest UV index in Iona, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Iona?
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.
When it does not snow in Iona?
In Iona, South Dakota, snow does not fall in May through September.
What is the wettest month in Iona?
The month with the most rainfall is June, when the rain falls for 14.6 days and typically aggregates up to 3.03" (77mm) of precipitation.
When are the longest days in Iona?
June has the longest days of the year in Iona, South Dakota, with an average of 15h and 24min of daylight.
What are the months with the highest UV index in Iona?
The months with the highest UV index in Iona are June through August, with an average maximum UV index of 6.
What is the warmest month in Iona?
The warmest month in Iona, South Dakota, is July, with an average high-temperature of 88°F (31.1°C) and an average low-temperature of 66.2°F (19°C).
What month has the most sunshine in Iona?
July has the most sunshine of the year, with an average of 11.4h of sunshine.
What is the least humid month in Iona?
With an average relative humidity of 58%, September is the least humid month in Iona.
What is the driest month in Iona?
November is the month with the least rainfall. Rain falls for 4.1 days and accumulates 0.55" (14mm) of precipitation.
What is the month with the shortest days in Iona?
The month with the shortest days in Iona is December, with an average of 9h and 0min of daylight.
Average temperature
Iona, SD
The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (26.1°F).
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure
Iona, 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:
29.84"Hg
- Average pressure in July:
29.91"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.95"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 January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed
Iona, SD
- Average wind speed in January:
10.3mph - Average wind speed in February:
9.9mph - Average wind speed in March:
10.6mph - Average wind speed in April:
11.3mph - Average wind speed in May:
10.4mph - Average wind speed in June:
9.8mph
- Average wind speed in July:
9.2mph - Average wind speed in August:
9.1mph - Average wind speed in September:
10.3mph - Average wind speed in October:
10.7mph - Average wind speed in November:
10.1mph - Average wind speed in December:
10mph
The windiest month (with the highest average wind speed) is April (11.3mph).
The calmest month (with the lowest average wind speed) is August (9.1mph).
Average humidity
Iona, SD
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is September (58%).
Average rainfall
Iona, SD
- Average rainfall in January:
0.59" - Average rainfall in February:
0.67" - Average rainfall in March:
1.26" - Average rainfall in April:
1.89" - Average rainfall in May:
2.8" - Average rainfall in June:
3.03"
- Average rainfall in July:
2.28" - Average rainfall in August:
1.5" - Average rainfall in September:
1.18" - Average rainfall in October:
1.14" - Average rainfall in November:
0.55" - Average rainfall in December:
0.94"
The wettest month (with the highest rainfall) is June (3.03").
The driest month (with the least rainfall) is November (0.55").
Average rainfall days
Iona, SD
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
8.8 days - Average rainfall days in April:
13.7 days - Average rainfall days in May:
15.3 days - Average rainfall days in June:
14.6 days
- Average rainfall days in July:
11.8 days - Average rainfall days in August:
11 days - Average rainfall days in September:
8.5 days - Average rainfall days in October:
7.8 days - Average rainfall days in November:
4.1 days - Average rainfall days in December:
3.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall
Iona, SD
The month with the highest snowfall is February (3.66").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Iona, SD
- Average snowfall days in January:
11.7 days - Average snowfall days in February:
11.7 days - Average snowfall days in March:
8.3 days - Average snowfall days in April:
3.4 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:
1.6 days - Average snowfall days in November:
4.5 days - Average snowfall days in December:
9.6 days
The months with the highest number of snowfall days are January and February (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Iona, SD
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 3min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - 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 4min - 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 4min - Average sunshine in February:
5h and 5min - Average sunshine in March:
6h and 5min - Average sunshine in April:
7h and 5min - Average sunshine in May:
9h and 3min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
11h and 2min - Average sunshine in August:
11h and 0min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 5min - Average sunshine in November:
6h and 1min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Iona, SD
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
16.3 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
12.1 days - Average sunshine days in June:
12.4 days
- Average sunshine days in July:
15.9 days - Average sunshine days in August:
17.2 days - Average sunshine days in September:
19.6 days - Average sunshine days in October:
19.9 days - Average sunshine days in November:
20.7 days - Average sunshine days in December:
19.5 days
The month with the most sunshine days is November (20.7 days).
The month with the least sunshine days is April (11.8 days).
Average UV index
Iona, SD
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover
Iona, SD
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility
Iona, 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).
Iona, South Dakota, USA
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