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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
Climate and monthly weather forecast
Weather in January
January, the same as December, in Erwin, South Dakota, is a freezing cold winter month, with temperature in the range of an average high of 19.4°F (-7°C) and an average low of 5.5°F (-14.7°C). Erwin's January weather, marked by an average high temperature of 19.4°F (-7°C) and an average low temperature of 5.5°F (-14.7°C), is the coldest in the year. Weather in January »
Weather in February
February, the last month of the winter in Erwin, is another freezing cold month, with an average temperature varying between 8.4°F (-13.1°C) and 22.5°F (-5.3°C). Erwin observes an average high-temperature of a still freezing cold 22.5°F (-5.3°C) in February, barely different from 19.4°F (-7°C) in January. Weather in February »
Weather in March
March, the first month of the spring in Erwin, is an icy month, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 38.1°F (3.4°C). In Erwin, the average high-temperature in March soars, from a freezing cold 22.5°F (-5.3°C) in February, to a cold 38.1°F (3.4°C). Weather in March »
Weather in April
April in Erwin, South Dakota, is a fresh spring month, with an average temperature fluctuating between 35.2°F (1.8°C) and 51.6°F (10.9°C). An upsurge in temperatures occurs as March gives way to April, with average highs shifting from a wintry 38.1°F (3.4°C) to a cool 51.6°F (10.9°C). Weather in April »
Weather in May
The last month of the spring, May, is an enjoyable month in Erwin, South Dakota, with an average temperature varying between 64.6°F (18.1°C) and 46.9°F (8.3°C). May's onset brings a rise in the average high-temperature, moving from a cool 51.6°F (10.9°C) in April to a comfortable 64.6°F (18.1°C). Weather in May »
Weather in June
June, the first month of the summer in Erwin, is a moderately hot month, with an average temperature varying between 74.5°F (23.6°C) and 56.8°F (13.8°C). The shift into June brings an increase in the average high-temperature, moving from an enjoyable 64.6°F (18.1°C) in May to a warm 74.5°F (23.6°C). Weather in June »
Weather in July
July, like June, in Erwin, South Dakota, is another warm summer month, with an average temperature fluctuating between 80.8°F (27.1°C) and 60.8°F (16°C). Erwin's July weather, marked by an average high temperature of 80.8°F (27.1°C) and an average low temperature of 60.8°F (16°C), is the warmest in the year. For most parts of July, the heat index is computed to be 84.2°F (29°C). Weather in July »
Weather in August
August, the last month of the summer in Erwin, is another warm month, with an average temperature ranging between max 80.1°F (26.7°C) and min 59°F (15°C). With the transition into August, Erwin notes an average high-temperature of a still moderately hot 80.1°F (26.7°C), closely resembling July. Weather in August »
Weather in September
September, the first month of the autumn in Erwin, is also an agreeable month, with an average temperature ranging between max 71.6°F (22°C) and min 51.3°F (10.7°C). The move into September indicates a slight reduction in the average high-temperature, down from August's warm 80.1°F (26.7°C) to a pleasant 71.6°F (22°C). Weather in September »
Weather in October
October, the same as September, is another fresh autumn month in Erwin, South Dakota, with temperature in the range of an average low of 39°F (3.9°C) and an average high of 54.3°F (12.4°C). October signals a considerable drop in Erwin's average high-temperature, reducing from a pleasant 71.6°F (22°C) in September to a fresh 54.3°F (12.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cold month in Erwin, South Dakota, with an average temperature varying between 26.4°F (-3.1°C) and 40.1°F (4.5°C). In Erwin, entering November brings a temperature decrement, reducing from October's fresh 54.3°F (12.4°C) to an icy 40.1°F (4.5°C). Weather in November »
Weather in December
December, the first month of the winter in Erwin, is still a freezing cold month, with an average temperature varying between 12.4°F (-10.9°C) and 23.7°F (-4.6°C). The arrival of December brings a significant change in Erwin's weather, with average high-temperatures dropping from November's icy 40.1°F (4.5°C) to a freezing cold 23.7°F (-4.6°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
What month is the coldest in Erwin?
With average high temperatures of 19.4°F (-7°C) and lows of 5.5°F (-14.7°C), January is the coldest month in Erwin.
What is the most humid month in Erwin?
With an average relative humidity of 90%, January is the most humid month.
What is the driest month in Erwin?
The months with the least rainfall in Erwin, South Dakota, are January and February Rain falls for 2.9 days and accumulates 0.59" (15mm) of rain.
How many days does it rain in Erwin?
Throughout the year, in Erwin, South Dakota, there are 112.3 rainfall days, and 18.78" (477mm) of precipitation is accumulated.
When does it snow in Erwin?
January through May, October through December are months with snowfall.
What is the snowiest month in Erwin?
The months with the most snowfall are January and December, with an average 3.74" (95mm) of accumulated snow.
How many days does it snow in Erwin?
In Erwin, during the entire year, snow falls for 64.3 days and aggregates up to 17.56" (446mm) of snow.
What is the month with the least sunshine in Erwin?
With an average of 3.6h of sunshine, January has the least sunshine of the year in Erwin.
What is the month with the lowest UV index in Erwin?
The months with the lowest UV index in Erwin are January and December, with an average maximum UV index of 1.
When is Daylight Saving Time (DST) in Erwin?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Erwin, 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.
What is the wettest month in Erwin?
The month with the most rainfall in Erwin is June, when the rain falls for 17.2 days and typically aggregates up to 3.19" (81mm) of precipitation.
When it does not snow in Erwin?
In Erwin, snow does not fall in June through September.
When are the longest days in Erwin?
June has the longest days of the year, with an average of 15h and 30min of daylight.
When is the highest UV index in Erwin?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What time of the year is the hottest in Erwin?
In Erwin, July is the warmest month, with temperatures averaging a high of 80.8°F (27.1°C) and a low of 60.8°F (16°C).
What month has the most sunshine in Erwin?
July has the most sunshine of the year in Erwin, South Dakota, with an average of 10.7h of sunshine.
What is the least humid month in Erwin?
September and October, with an average relative humidity of 68%, are the least humid months in Erwin, South Dakota.
What is the month with the shortest days in Erwin?
December has the shortest days of the year, with an average of 8h and 54min of daylight.
Average temperature
Erwin, SD
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (19.4°F).
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (5.5°F).
Average pressure
Erwin, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.08"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:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.97"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
Erwin, SD
- Average wind speed in January:
11mph - Average wind speed in February:
10.8mph - Average wind speed in March:
10.9mph - Average wind speed in April:
11.6mph - Average wind speed in May:
10.3mph - Average wind speed in June:
9.4mph
- Average wind speed in July:
8.5mph - Average wind speed in August:
8.6mph - Average wind speed in September:
10mph - Average wind speed in October:
11.2mph - Average wind speed in November:
11mph - Average wind speed in December:
11mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest month (with the lowest average wind speed) is July (8.5mph).
Average humidity
Erwin, SD
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are September and October (68%).
Average rainfall
Erwin, SD
- Average rainfall in January:
0.59" - Average rainfall in February:
0.59" - Average rainfall in March:
1.02" - Average rainfall in April:
1.46" - Average rainfall in May:
2.52" - Average rainfall in June:
3.19"
- Average rainfall in July:
2.91" - Average rainfall in August:
1.81" - Average rainfall in September:
1.57" - Average rainfall in October:
1.73" - Average rainfall in November:
0.63" - Average rainfall in December:
0.75"
The wettest month (with the highest rainfall) is June (3.19").
The driest months (with the least rainfall) are January and February (0.59").
Average rainfall days
Erwin, SD
- Average rainfall days in January:
2.9 days - Average rainfall days in February:
2.7 days - Average rainfall days in March:
7.8 days - Average rainfall days in April:
11.6 days - Average rainfall days in May:
16.3 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
12.4 days - Average rainfall days in September:
10.4 days - Average rainfall days in October:
8.3 days - Average rainfall days in November:
4.9 days - Average rainfall days in December:
3.5 days
The month with the highest number of rainy days is June (17.2 days).
The month with the least rainy days is February (2.7 days).
Average snowfall
Erwin, SD
- Average snowfall in January:
3.74" - Average snowfall in February:
3.35" - Average snowfall in March:
2.2" - Average snowfall in April:
1.46" - Average snowfall in May:
0.12" - Average snowfall in June:
0"
The months with the highest snowfall are January and December (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Erwin, SD
- Average snowfall days in January:
14.4 days - Average snowfall days in February:
11.8 days - Average snowfall days in March:
10 days - Average snowfall days in April:
4.8 days - Average snowfall days in May:
0.8 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:
0.1 days - Average snowfall days in October:
2.3 days - Average snowfall days in November:
7.1 days - Average snowfall days in December:
13 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Erwin, 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 5min - Average daylight in June:
15h and 3min
- Average daylight in July:
15h and 1min - Average daylight in August:
14h and 0min - 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:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
4h and 2min - Average sunshine in March:
5h and 2min - Average sunshine in April:
7h and 3min - Average sunshine in May:
8h and 4min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 2min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Erwin, SD
- Average sunshine days in January:
15.1 days - Average sunshine days in February:
15.3 days - Average sunshine days in March:
14.2 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
11.9 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
13.8 days - Average sunshine days in August:
15.7 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
19 days - Average sunshine days in December:
16.3 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is June (10.3 days).
Average UV index
Erwin, SD
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Erwin, SD
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility
Erwin, 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).