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Monthly
Summary
Summary
CASTLE ROCK, SOUTH DAKOTA
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North America > United States > South Dakota
Elevation: 954 meters Latitude: 44 57N Longitude: 103 46W
Elevation: 954 meters Latitude: 44 57N Longitude: 103 46W
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WEATHER
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CURRENT CONDITIONS
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TEMPERATURE
Average Temperature | Years on Record: 9  |
 | ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| C | 6.4 | -9.4 | -5.9 | -2 | 5.5 | 11.6 | 16.8 | 21.7 | 20.3 | 14.7 | 8.7 | 0.6 | -6.1 |
Average High Temperature | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| C | 13.7 | -2.8 | 0.9 | 4.8 | 12.2 | 18.8 | 23.3 | 29.4 | 28.8 | 22.8 | 17.5 | 8.1 | 0.4 |
Average Low Temperature | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| C | -0.9 | -16.1 | -12.7 | -8.8 | -1.2 | 4.5 | 10.3 | 13.9 | 11.9 | 6.5 | -0.1 | -6.9 | -12.7 |
Highest Recorded Temperature | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| C | 41.7 | 17.8 | 17.2 | 25.6 | 28.9 | 35 | 38.9 | 41.7 | 41.7 | 35.6 | 33.3 | 24.4 | 17.2 |
Lowest Recorded Temperature | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| C | -37.2 | -37.2 | -32.2 | -27.2 | -16.7 | -9.4 | -1.1 | 3.3 | 2.2 | -6.1 | -12.8 | -28.3 | -33.9 |
Average Number of Days Above 90F/32C | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 22.5 | --- | --- | --- | --- | 0.4 | 1.4 | 8 | 10.6 | 1.9 | 0.2 | --- | --- |
Average Number of Days Below 32F/0C | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 191.8 | 30.5 | 27.9 | 28.3 | 20.1 | 4.9 | 0.5 | --- | --- | 2.8 | 17.6 | 28.6 | 30.8 |
Average Number of Days Below 0F/-17C | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 33.5 | 12.9 | 7.9 | 4.3 | --- | --- | --- | --- | --- | --- | --- | 1 | 7.5 |
PRECIPITATION
Average Precipitation | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| mm | 350 | 6 | 10 | 13 | 33 | 57 | 94 | 53 | 26 | 29 | 13 | 8 | 8 |
Average Number of Days With Precipitation | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 86 | 5 | 5 | 5 | 9 | 11 | 15 | 9 | 8 | 6 | 4 | 4 | 5 |
Most Reported Precipitation in a Month | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| mm | 145 | 10 | 29 | 26 | 67 | 121 | 145 | 81 | 55 | 66 | 30 | 29 | 18 |
Least Reported Precipitation in a Month | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| mm | --- | 2 | 1 | 7 | 9 | 21 | 63 | 13 | 11 | 2 | --- | 1 | 1 |
Most Precipitation Reported in a Day | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| mm | 53.6 | 4.6 | 12.7 | 7.1 | 19.3 | 30 | 53.6 | 48.3 | 16.5 | 25.6 | 15.5 | 3.3 | 10.2 |
Avg. No. of Days w/Precip. Above 0.2in/5mm | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 35 | 1 | 1 | 2 | 4 | 5 | 8 | 5 | 3 | 3 | 1 | 1 | 1 |
Avg. # of Days w/Precip. Above 0.4in/10mm | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 6 | --- | --- | --- | 1 | 1 | 2 | 1 | --- | 1 | --- | --- | --- |
Avg. No. of Days w/Precip. Above 1in/25mm | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 1 | --- | --- | --- | --- | --- | 1 | --- | --- | --- | --- | --- | --- |
PRECIPITATION - SNOW
Average Snowfall | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| cm | 74.4 | 9.7 | 13.5 | 15.2 | 14.7 | 5.3 | --- | --- | --- | 1 | 0.5 | 2 | 12.4 |
Most Snow Reported in a Month | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| cm | 48.3 | 16.8 | 30.7 | 30.5 | 48.3 | 20.3 | --- | --- | --- | 7.6 | 5.1 | 11.4 | 27.9 |
DEGREE DAYS
Heating Degree Days | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 3136.7 | 688.3 | 526.7 | 458.9 | 222.8 | 86.7 | 10.6 | --- | 3.9 | 38.9 | 148.3 | 366.7 | 585 |
Cooling Degree Days | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 256.1 | --- | --- | --- | --- | 6.1 | 26.1 | 112.8 | 92.2 | 17.2 | 1.7 | --- | --- |
Growing Degree Days | Years on Record: 9 |
| ANNUAL | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | ||||||||||||||
| Days | 1076.9 | --- | --- | --- | --- | 49.9 | 203.3 | 363.4 | 320.3 | 140 | --- | --- | --- |
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