Climate and monthly weather forecastSinai, SD
Climate and monthly weather forecast
Weather in January
January, the same as December, in Sinai, South Dakota, is a freezing cold winter month, with temperature in the range of an average high of 20.7°F (-6.3°C) and an average low of 7°F (-13.9°C). In Sinai, South Dakota, January is the month with the lowest recorded average temperatures, measuring a high of 20.7°F (-6.3°C) and a low of 7°F (-13.9°C). Weather in January »Weather in February
February, the last month of the winter in Sinai, is another freezing cold month, with temperature in the range of an average low of 10.2°F (-12.1°C) and an average high of 24.3°F (-4.3°C). Sinai experiences an average high-temperature of a still subzero cold 24.3°F (-4.3°C) in February, subtly different from January's 20.7°F (-6.3°C). Weather in February »Weather in March
March, the first month of the spring in Sinai, is an icy month, with temperature in the range of an average low of 25.2°F (-3.8°C) and an average high of 39.7°F (4.3°C). The beginning of March marks a clear shift in the average high-temperature, advancing from February's subzero cold 24.3°F (-4.3°C) to an icy 39.7°F (4.3°C). Weather in March »Weather in April
April in Sinai, South Dakota, is a fresh spring month, with an average temperature varying between 53.1°F (11.7°C) and 36.7°F (2.6°C). The start of April brings a rise in the average high-temperature, moving from an icy 39.7°F (4.3°C) in March to a fresh 53.1°F (11.7°C). Weather in April »Weather in May
May, the last month of the spring in Sinai, is a comfortable month, with an average temperature varying between 65.8°F (18.8°C) and 48.4°F (9.1°C). The arrival of May signals an increase in the average high-temperature, moving from a fresh 53.1°F (11.7°C) in April to a comfortable 65.8°F (18.8°C). Weather in May »Weather in June
June, the first month of the summer in Sinai, is a moderately hot month, with an average temperature fluctuating between 58.1°F (14.5°C) and 75.7°F (24.3°C). With the onset of June, Sinai's weather sees a temperature rise, transitioning from a refreshing 65.8°F (18.8°C) in May to a moderately hot 75.7°F (24.3°C). Weather in June »Weather in July
July, like June, in Sinai, South Dakota, is a moderately hot summer month, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 62.2°F (16.8°C). Sinai's July weather, marked by an average high temperature of 81.3°F (27.4°C) and an average low temperature of 62.2°F (16.8°C), is the warmest in the year. Throughout July, the heat index is estimated at a tropical 86°F (30°C). Weather in July »Weather in August
August, the last month of the summer in Sinai, is also a moderately hot month, with an average temperature ranging between max 80.2°F (26.8°C) and min 59.2°F (15.1°C). August notes an average high-temperature of a still warm 80.2°F (26.8°C), subtly differing from July's 81.3°F (27.4°C). Weather in August »Weather in September
The first month of the autumn, September, is still a pleasant month in Sinai, South Dakota, with an average temperature ranging between min 52.3°F (11.3°C) and max 72.5°F (22.5°C). Sinai's transition into September involves a gentle shift in temperature, receding from a warm 80.2°F (26.8°C) in August to a pleasant 72.5°F (22.5°C). Weather in September »Weather in October
October, like September, is a moderate autumn month in Sinai, South Dakota, with an average temperature ranging between max 55.6°F (13.1°C) and min 39.6°F (4.2°C). As Sinai transitions into October, a marked decrease in the average high-temperature is observed, dropping from an agreeable 72.5°F (22.5°C) in September to a mild 55.6°F (13.1°C). Weather in October »Weather in November
The last month of the autumn, November, is also an icy month in Sinai, South Dakota, with an average temperature varying between 27.5°F (-2.5°C) and 41.2°F (5.1°C). Sinai's weather experiences a significant temperature drop with the arrival of November, falling from a refreshing 55.6°F (13.1°C) in October to a cold 41.2°F (5.1°C). Weather in November »Weather in December
December, the first month of the winter in Sinai, is also a subzero cold month, with an average temperature varying between 25.7°F (-3.5°C) and 13.6°F (-10.2°C). With the transition into December, Sinai experiences a significant decrease in average high-temperatures, moving down from a cold 41.2°F (5.1°C) in November to a subzero cold 25.7°F (-3.5°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, with average temperatures reaching a high of 20.7°F (-6.3°C) and a low of 7°F (-13.9°C), is the coldest month in Sinai, South Dakota.
The most humid month in Sinai is January, with an average relative humidity of 90%.
In Sinai, during the entire year, the rain falls for 125.5 days and collects up to 21.65" (550mm) of precipitation.
January through May, October through December are months with snowfall in Sinai, South Dakota.
In Sinai, South Dakota, during the entire year, snow falls for 61.5 days and aggregates up to 21.38" (543mm) of snow.
January has the least sunshine of the year in Sinai, South Dakota, with an average of 3.8h of sunshine.
January is the month with the lowest UV index, with an average maximum UV index of 1.
The month with the most snowfall is February, when snow falls for 11.5 days and typically aggregates up to 4.69" (119mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Sinai, 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.
June is the month with the most rainfall. Rain falls for 19.8 days and accumulates 3.46" (88mm) of precipitation.
June through September are months without snowfall in Sinai, South Dakota.
With an average of 15h and 30min of daylight, June has the longest days of the year in Sinai.
June and July, with an average maximum UV index of 6, are months with the highest UV index in Sinai.
The warmest temperatures in Sinai, South Dakota, occur during July, when averages reach a peak of 81.3°F (27.4°C) and a low of 62.2°F (16.8°C).
July has the most sunshine of the year, with an average of 10.6h of sunshine.
With an average relative humidity of 68%, October is the least humid month.
November is the month with the least rainfall in Sinai. Rain falls for 5.5 days and accumulates 0.67" (17mm) of precipitation.
December has the shortest days of the year, with an average of 8h and 54min of daylight.
Average temperature
Sinai, SD
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (20.7°F).
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (7°F).
Average pressure
Sinai, SD
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.16"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.92"Hg - Average pressure in June:
29.86"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.93"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 (29.86"Hg).
Average wind speed
Sinai, SD
- Average wind speed in January:
10.8mph - Average wind speed in February:
10.8mph - Average wind speed in March:
10.8mph - Average wind speed in April:
11.5mph - Average wind speed in May:
10.1mph - Average wind speed in June:
9.2mph
- Average wind speed in July:
8.4mph - Average wind speed in August:
8.5mph - Average wind speed in September:
9.8mph - Average wind speed in October:
10.9mph - Average wind speed in November:
10.9mph - Average wind speed in December:
10.7mph
The windiest month (with the highest average wind speed) is April (11.5mph).
The calmest month (with the lowest average wind speed) is July (8.4mph).
Average humidity
Sinai, SD
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is October (68%).
Average rainfall
Sinai, SD
- Average rainfall in January:
0.71" - Average rainfall in February:
0.75" - Average rainfall in March:
1.34" - Average rainfall in April:
2.24" - Average rainfall in May:
2.72" - Average rainfall in June:
3.46"
- Average rainfall in July:
3.03" - Average rainfall in August:
2.24" - Average rainfall in September:
1.65" - Average rainfall in October:
1.73" - Average rainfall in November:
0.67" - Average rainfall in December:
1.1"
The wettest month (with the highest rainfall) is June (3.46").
The driest month (with the least rainfall) is November (0.67").
Average rainfall days
Sinai, SD
- Average rainfall days in January:
3.2 days - Average rainfall days in February:
3.3 days - Average rainfall days in March:
9.7 days - Average rainfall days in April:
13.5 days - Average rainfall days in May:
16.4 days - Average rainfall days in June:
19.8 days
- Average rainfall days in July:
14.8 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
10.9 days - Average rainfall days in October:
9 days - Average rainfall days in November:
5.5 days - Average rainfall days in December:
5.1 days
The month with the highest number of rainy days is June (19.8 days).
The month with the least rainy days is January (3.2 days).
Average snowfall
Sinai, SD
- Average snowfall in January:
4.13" - Average snowfall in February:
4.69" - Average snowfall in March:
3.58" - Average snowfall in April:
2.13" - Average snowfall in May:
0.16" - Average snowfall in June:
0"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sinai, SD
- Average snowfall days in January:
14.4 days - Average snowfall days in February:
11.5 days - Average snowfall days in March:
9.7 days - Average snowfall days in April:
4.7 days - Average snowfall days in May:
0.4 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:
5.9 days - Average snowfall days in December:
13.3 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, August and September (0 days).
Average daylight / Average sunshine
Sinai, 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 48min - Average daylight in June:
15h and 30min
- Average daylight in July:
15h and 6min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - 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:
3h and 48min - Average sunshine in February:
4h and 48min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 36min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 54min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Sinai, SD
- Average sunshine days in January:
15.8 days - Average sunshine days in February:
15 days - Average sunshine days in March:
13.7 days - Average sunshine days in April:
11.9 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
8.3 days
- Average sunshine days in July:
13.4 days - Average sunshine days in August:
14.5 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
18.9 days - Average sunshine days in December:
16.1 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is June (8.3 days).
Average UV index
Sinai, SD
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Sinai, SD
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility
Sinai, 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).
