October 2010 was the seventh warmest October at the Rapid City Regional Airport--in contrast to last year's coldest October. The average temperature this year was 53.3 degrees; the highest average October temperature is 59.4 degrees in 1963. Last year's average temperature was 38.7 degrees, which ironically was the average minimum temperature this year.
Downtown Rapid City also had its seventh warmest October with an average temperature of 54.6 degrees. October of 1963 is the warmest at 60.8 degrees.
Additional station reports:
Opal/Maurine 12SW had the warmest October as their average temperature of 50.9 degrees passed 49.4 degrees of October 1980.
Several stations reported their second warmest October: Devils Tower had 51.4 degrees, just below the record of 53.9 degrees in 1963. Interior 3NE/Cedar Pass recorded an average temperature of 57.9; their October record is 63.6 degrees also set in 1963. Oelrichs' average temperature was 53.5 degrees; their warmest October is 54.2 degrees in 1950.
Heavy rain fell October 9-10 in the northern Black Hills. Lead received 4.64 inches in 24 hours ending the evening of October 10, which is the second wettest day in October, behind 5.14 inches that fell October 6, 1994, and the seventh wettest day for any time of year. The rain gave Lead its fifth wettest October. The wettest October on record is 9.30 inches in 1994, followed by
2nd: 9.27 inches in 1998
3rd: 7.67 inches in 1982, and
4th: 6.94 inches in 1995.
This year's precipitation topped the 5.99 inches measured in 1996.
Unlike many of these years, most of this year's precipitation fell as rain, with only 1.8 inches of snow measured in Lead. The snowiest Octobers include:
highest: 70.2 inches in 1995
2nd: 64.3 inches in 1982
3rd: 61.3 inches in 1998
4th: 61.1 inches in 1996
5th: 53.3 inches in 2009
October 1994 recorded only 1.6 inches of snow.