National Weather Service United States Department of Commerce

Severe Storms; Fire Danger; and Strong Pacific Storms

More strong storms on tap for the Pacific Northwest this weekend. Heavy rains could produce flooding and mudslides. Saturday, a cold front moving into the central U.S. will bring potential for severe thunderstorms containing damaging winds, large hail, and isolated tornadoes; and localized flooding potential. Dry winds in southwestern California will keep fire weather threats high. Read More >

Selected Quick Reference Climatic Info for Sioux Falls and South Dakota

Temperatures...   ....Sioux Falls....       ....South Dakota....

Record High       110F /43C  Jun 21 1988   120F 17 WSW Ft. Pierre Jul 15 2006 
                             Jul 17 1936         4 NW Gann Valley  Jul 5 1936 
Record Low        -42F/-41C  Feb  9 1899   -58F  McIntosh         Feb 17 1936 

Warmest Year      50.6  1931                50.2  1931 State Avg. 
Coldest Year      40.9  1917                41.8  1917 State Avg.

Warmest Month     84.5  Jul 1936            87.7  Jul 1936  Pierre 
(also Warmest Avg High 98.9 and Low 70.2)   84.3  Jul 1936  State Avg.

Coldest Month      0.5  Feb 1936           -11.0  Feb 1936  Pollock 
(Coldest Avg Hi   10.9  Jan 1979)           -3.6  Feb 1936  State Avg 
(Coldest Avg Low -10.9  Feb 1936)

Warmest Summer    77.8  1936                77.6      1936  State Avg
Coldest Summer    63.8  1915
Coldest Winter     8.0  1978-79              8.6   1935-36  State Avg 
Warmest Winter    28.7  1930-31

Precipitation...  ....Sioux Falls....         ....South Dakota....
                                                                
Wettest Year     38.26  2010               48.42  1946  Deadwood (Blk Hls) 
                                           44.66  1909  Vermillion (Plains)
                                           28.54  1915  State Avg

Driest Year      10.53  1894                2.89  1936  Ludlow
                                           10.91  1936  State Avg

Wettest Month    13.70  June 2014          18.61  May 1946  Deadwood
                                           19.75  Jun 2014  Canton

Driest Month      Zero  Nov 1914             .02  Oct 1952  State Avg

Wettest Day       4.59  Aug  1 1975         8.74  May 5 2007  Groton 
                                                              ..Official 
                                           14.0   Jun  9 1972  Nemo
                                               ..Black Hills..Unofficial 
Snowfall...
                                                              
Greatest Seasonal 94.7  1968/69            364.7  1993/94  Lead (BlkHls)
                                           109.2  1968/69  Clear Lake 

Greatest 24 Hr.   26.0  Feb 17/18 1962      52.0  Mar 14 1973  Lead

Greatest Storm    32.2  Feb 16-18 1962     112.4  Feb 25-Mar 1,98 Lead

Greatest Month    48.4  Feb 1962            94.0  Mar 1950  Dumont 2ENE
                                            50.0  Feb 1962  Canton 
Earliest Snowfall...
Significant..      (24 Hrs)                                (Black Hills)
(2.0+ Inches)      2.7  Oct 1 1999           4.0  Sep  1 1974  Deerfield 
                                             5.0 Sep 12-13 1903 Camp Crook
Measurable..       Sep 25 1939 (0.3 In.)
(0.1-1.9 In.)      Sep 28 1985 (0.9 In.)
                   Sep 28 1945 (0.1 In.)

Trace..            Sep 18 1929

Latest Snowfall...                                         (Black Hills) 
Significant..                                8.0  Jun 18 1973  Deerfield 
(2.0+ Inches)      2.0  May 12 1943          2.0  Jun  2 1951  Newell

Measurable..       May 18 1968 (0.1 In.)

Trace..            Jun 3 1998


                       ......Sioux Falls......
Temperatures...
Month    Record High       Record Low      Warmest Mean   Coldest Mean 
Jan     66  24th 1981    -38  12th 1912     31.1  2006      1.8  1979 
Feb     70  17th 1981    -42   9th 1899     33.4  1954      0.5  1936
            22nd 1982                             1931
            23rd 1958
Mar     88  30th 1943    -23  11th 1948     49.8  2012     16.9  1899 
Apr     98  28th 1910      4   3rd 1936     56.1  1925     37.8  1950 
May    104  30th 1934     17   4th 1967     70.4  1934     51.1  1907 
Jun    110  21st 1988     32   7th 1901     76.3  1988     61.4  1969
                               7th 1897
Jul    110  17th 1936     34   9th 1895     84.5  1936     65.5  1992 
Aug    109  24th 1936     34  20th 1950     78.8  1947     63.7  1915
                              29th 1893
Sep    104   6th 1976     13  29th 1899     69.9  1908     51.4  1965
             6th 1922
         4,5,6th 1913
Oct     94   5th 1963     -5  29th 1925     58.8  1938     37.8  1925 
Nov     81   8th 1999    -17  30th 1964     43.5  2001     18.2  1896
                              14th 1959
Dec     63 1,2,3 1998    -31  29th 1917     31.9  1918      2.1  1983

Precipitation...
Month     Wettest           Driest                Snowiest

Jan      2.33  1922       T  1901,1900            22.2  1929
Feb      4.05  1962       T  1923,1894            48.4  1962
Mar      4.90  2007      .01  1930                31.5  1951
Apr      6.97  2001      .02  1926                18.4  1983
May      9.42  1898      .10  1934                 3.0  1944
Jun     13.70  2014      .36  1893                  T   1998
Jul      9.11  1900      .24  2012                  0
AUG      9.33  1932      .36  1907                  0
Sep      9.26  1986      .20  2011                 0.9  1985
Oct      6.89  1911       T  1952,1933            10.0  1991
Nov      4.76  2001       0  1914                 21.9  1985
Dec      2.97  1945       T 1986,1944,1905,1896   41.1  1968

Maximum Snow Depth on Record     34 inches Dec 31 1968 / Feb 28 1969 
Greatest Annual Snowfall (Calendar Year)       78.2 inches (1983)
Least Annual Snowfall (Calendar Year)           9.5 inches (1901)
Latest First Measurable Snow of Season     Jan 8 1945  0.4 in.
Atmospheric Pressure...Highest on Record   31.15 inches on Jan  7 2015
                       Lowest on Record    28.63 inches on Mar 26 1950

Updated 4/5/2016