Climate and monthly weather forecastOpal, SD
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Opal, South Dakota, with an average temperature ranging between max 27°F (-2.8°C) and min 13.6°F (-10.2°C). January brings the lowest temperatures, with an average high of 27°F (-2.8°C) and an average low of 13.6°F (-10.2°C). Weather in January »Weather in February
February, the last month of the winter in Opal, is also a subzero cold month, with an average temperature fluctuating between 29.1°F (-1.6°C) and 15.8°F (-9°C). In Opal, February's average high-temperature stands at a still subzero cold 29.1°F (-1.6°C), closely related to the preceding month. Weather in February »Weather in March
March, the first month of the spring in Opal, is a frosty month, with temperature in the range of an average low of 27.9°F (-2.3°C) and an average high of 43.2°F (6.2°C). March's arrival coincides with a temperature rise, moving from February's subzero cold 29.1°F (-1.6°C) to a chilly 43.2°F (6.2°C). Weather in March »Weather in April
April is a fresh spring month in Opal, South Dakota, with an average temperature varying between 37.2°F (2.9°C) and 54.3°F (12.4°C). Opal in April experiences an increase in the average high-temperature, moving from March's frosty 43.2°F (6.2°C) to a fresh 54.3°F (12.4°C). Weather in April »Weather in May
May, the last month of the spring in Opal, is an enjoyable month, with an average temperature ranging between max 66°F (18.9°C) and min 47.8°F (8.8°C). May's onset brings a temperature rise, moving from a fresh 54.3°F (12.4°C) in April to a refreshing 66°F (18.9°C). Weather in May »Weather in June
June, the first month of the summer in Opal, is a warm month, with an average temperature ranging between min 58.3°F (14.6°C) and max 78.6°F (25.9°C). The shift into June is accompanied by a temperature increase, with the average high-temperature rising from an enjoyable 66°F (18.9°C) in May to a moderately hot 78.6°F (25.9°C). Weather in June »Weather in July
July is a hot summer month in Opal, South Dakota, with an average temperature fluctuating between 66°F (18.9°C) and 87.3°F (30.7°C). Opal reaches its highest average temperatures in July, measuring 87.3°F (30.7°C) at the peak and 66°F (18.9°C) at the lowest. For July, the heat index is estimated at a hot 89.6°F (32°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Opal, South Dakota, with an average temperature ranging between min 64°F (17.8°C) and max 84.7°F (29.3°C). With the onset of August, a modest change to a moderately hot 84.7°F (29.3°C) from July's 87.3°F (30.7°C) is noted in high-temperature. Weather in August »Weather in September
September, the first month of the autumn in Opal, is still a warm month, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 75.4°F (24.1°C). September brings a drop in Opal's average high-temperature, falling from 84.7°F (29.3°C) in August to a still moderately hot 75.4°F (24.1°C). Weather in September »Weather in October
October, like September, is another mild autumn month in Opal, South Dakota, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 41.2°F (5.1°C). October is characterized by a noticeable reduction in the average high-temperature, falling from a warm 75.4°F (24.1°C) in September to a mild 56.7°F (13.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Opal, South Dakota, with an average temperature varying between 43.3°F (6.3°C) and 29.1°F (-1.6°C). Opal in November experiences a subtle temperature decline, with average high-temperatures reducing from a refreshing 56.7°F (13.7°C) in October to a chilly 43.3°F (6.3°C). Weather in November »Weather in December
The first month of the winter, December, is also a subzero cold month in Opal, South Dakota, with an average temperature varying between 28.2°F (-2.1°C) and 16.2°F (-8.8°C). The shift from November to December sees a distinct decrease in the average high-temperature, dropping from a chilly 43.3°F (6.3°C) to a freezing cold 28.2°F (-2.1°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
In Opal, the average lowest temperatures are observed in January, with a high of 27°F (-2.8°C) and a low of 13.6°F (-10.2°C).
With an average relative humidity of 83%, January is the most humid month in Opal, South Dakota.
The month with the least rainfall is January, when the rain falls for 3.3 days and typically collects 0.51" (13mm) of precipitation.
Throughout the year, in Opal, South Dakota, there are 99.7 rainfall days, and 16.06" (408mm) of precipitation is accumulated.
Months with snowfall in Opal are January through May, October through December.
In Opal, South Dakota, during the entire year, snow falls for 58.3 days and aggregates up to 22.95" (583mm) of snow.
The month with the least sunshine is January, with an average of 4.8h of sunshine.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
The month with the most snowfall in Opal, South Dakota, is February, when snow falls for 12.2 days and typically aggregates up to 5.12" (130mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Opal, 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.
May is the month with the most rainfall. Rain falls for 14.7 days and accumulates 2.83" (72mm) of precipitation.
June through September are months without snowfall in Opal.
June has the longest days of the year in Opal, South Dakota, with an average of 15h and 30min of daylight.
With an average high-temperature of 87.3°F (30.7°C) and an average low-temperature of 66°F (18.9°C), July is the warmest month in Opal.
With an average of 11.5h of sunshine, July has the most sunshine of the year in Opal.
With an average maximum UV index of 7, July is the month with the highest UV index in Opal.
August and September, with an average relative humidity of 49%, are the least humid months in Opal, South Dakota.
December has the shortest days of the year in Opal, South Dakota, with an average of 8h and 54min of daylight.
Average temperature
Opal, SD
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (27°F).
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure
Opal, SD
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.15"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.84"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:
29.98"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.14"Hg
The months with the highest atmospheric pressure are January and February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed
Opal, SD
- Average wind speed in January:
11.3mph - Average wind speed in February:
10.4mph - Average wind speed in March:
11.2mph - Average wind speed in April:
12.2mph - Average wind speed in May:
11.6mph - Average wind speed in June:
11.1mph
- Average wind speed in July:
10.5mph - Average wind speed in August:
10.4mph - Average wind speed in September:
11.3mph - Average wind speed in October:
12.1mph - Average wind speed in November:
10.9mph - Average wind speed in December:
10.9mph
The windiest month (with the highest average wind speed) is April (12.2mph).
The calmest months (with the lowest average wind speed) are February and August (10.4mph).
Average humidity
Opal, SD
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are August and September (49%).
Average rainfall
Opal, SD
- Average rainfall in January:
0.51" - Average rainfall in February:
0.79" - Average rainfall in March:
1.1" - Average rainfall in April:
1.81" - Average rainfall in May:
2.83" - Average rainfall in June:
2.28"
- Average rainfall in July:
1.89" - Average rainfall in August:
1.26" - Average rainfall in September:
0.87" - Average rainfall in October:
1.34" - Average rainfall in November:
0.55" - Average rainfall in December:
0.83"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days
Opal, SD
- Average rainfall days in January:
3.3 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
8 days - Average rainfall days in April:
12.3 days - Average rainfall days in May:
14.7 days - Average rainfall days in June:
13.8 days
- Average rainfall days in July:
10.8 days - Average rainfall days in August:
10.8 days - Average rainfall days in September:
7.9 days - Average rainfall days in October:
7.4 days - Average rainfall days in November:
3.4 days - Average rainfall days in December:
4 days
The month with the highest number of rainy days is May (14.7 days).
The months with the least rainy days are January and February (3.3 days).
Average snowfall
Opal, SD
- Average snowfall in January:
3.07" - Average snowfall in February:
5.12" - Average snowfall in March:
4.13" - Average snowfall in April:
3.39" - Average snowfall in May:
0.79" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Opal, SD
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
12.2 days - Average snowfall days in March:
9.3 days - Average snowfall days in April:
5.3 days - Average snowfall days in May:
0.9 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:
2.5 days - Average snowfall days in November:
5.4 days - Average snowfall days in December:
10.4 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Opal, SD
- Average daylight in January:
9h and 18min - 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 54min - Average daylight in June:
15h and 30min
- 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 36min - Average daylight in December:
8h and 54min
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:
4h and 48min - Average sunshine in February:
4h and 54min - Average sunshine in March:
6h and 24min - Average sunshine in April:
8h and 42min - Average sunshine in May:
9h and 30min - Average sunshine in June:
10h and 48min
- Average sunshine in July:
11h and 30min - Average sunshine in August:
11h and 24min - Average sunshine in September:
9h and 42min - Average sunshine in October:
6h and 54min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 6min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days
Opal, SD
- Average sunshine days in January:
16.4 days - Average sunshine days in February:
15.2 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
12.4 days - Average sunshine days in May:
13.6 days - Average sunshine days in June:
13.4 days
- Average sunshine days in July:
16.6 days - Average sunshine days in August:
17 days - Average sunshine days in September:
20.4 days - Average sunshine days in October:
19.9 days - Average sunshine days in November:
20.1 days - Average sunshine days in December:
17.3 days
The month with the most sunshine days is September (20.4 days).
The month with the least sunshine days is April (12.4 days).
Average UV index
Opal, SD
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Opal, SD
The month with the most cloud cover is January (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 19).
Average visibility
Opal, 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).
