<Tr> <Td_colspan="14"> Source: NOAA </Td> </Tr> <Table> <Tr> <Th_colspan="14"> (show) Climate data for Williston, North Dakota (Sloulin Int'l), 1981--2010 normals, extremes 1894--present </Th> </Tr> <Tr> <Th> Month </Th> <Th> Jan </Th> <Th> Feb </Th> <Th> Mar </Th> <Th> Apr </Th> <Th> May </Th> <Th> Jun </Th> <Th> Jul </Th> <Th> Aug </Th> <Th> Sep </Th> <Th> Oct </Th> <Th> Nov </Th> <Th> Dec </Th> <Th> Year </Th> </Tr> <Tr> <Th> Record high ° F (° C) </Th> <Td> 58 (14) </Td> <Td> 66 (19) </Td> <Td> 84 (29) </Td> <Td> 92 (33) </Td> <Td> 106 (41) </Td> <Td> 108 (42) </Td> <Td> 110 (43) </Td> <Td> 108 (42) </Td> <Td> 104 (40) </Td> <Td> 93 (34) </Td> <Td> 76 (24) </Td> <Td> 63 (17) </Td> <Td> 110 (43) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 21.9 (− 5.6) </Td> <Td> 27.5 (− 2.5) </Td> <Td> 40.4 (4.7) </Td> <Td> 57.0 (13.9) </Td> <Td> 67.7 (19.8) </Td> <Td> 76.8 (24.9) </Td> <Td> 84.4 (29.1) </Td> <Td> 83.8 (28.8) </Td> <Td> 71.3 (21.8) </Td> <Td> 56.3 (13.5) </Td> <Td> 37.9 (3.3) </Td> <Td> 24.4 (− 4.2) </Td> <Td> 54.1 (12.3) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 0.1 (− 17.7) </Td> <Td> 6.3 (− 14.3) </Td> <Td> 18.2 (− 7.7) </Td> <Td> 29.7 (− 1.3) </Td> <Td> 40.5 (4.7) </Td> <Td> 49.7 (9.8) </Td> <Td> 55.8 (13.2) </Td> <Td> 53.9 (12.2) </Td> <Td> 42.1 (5.6) </Td> <Td> 29.8 (− 1.2) </Td> <Td> 16.4 (− 8.7) </Td> <Td> 3.3 (− 15.9) </Td> <Td> 28.8 (− 1.8) </Td> </Tr> <Tr> <Th> Record low ° F (° C) </Th> <Td> − 42 (− 41) </Td> <Td> − 50 (− 46) </Td> <Td> − 35 (− 37) </Td> <Td> − 15 (− 26) </Td> <Td> 10 (− 12) </Td> <Td> 26 (− 3) </Td> <Td> 34 (1) </Td> <Td> 32 (0) </Td> <Td> 13 (− 11) </Td> <Td> − 9 (− 23) </Td> <Td> − 27 (− 33) </Td> <Td> − 50 (− 46) </Td> <Td> − 50 (− 46) </Td> </Tr> <Tr> <Th> Average precipitation inches (mm) </Th> <Td> 0.59 (15) </Td> <Td> 0.39 (9.9) </Td> <Td> 0.71 (18) </Td> <Td> 1.00 (25.4) </Td> <Td> 1.92 (48.8) </Td> <Td> 2.52 (64) </Td> <Td> 2.54 (64.5) </Td> <Td> 1.45 (36.8) </Td> <Td> 1.06 (26.9) </Td> <Td> 0.92 (23.4) </Td> <Td> 0.65 (16.5) </Td> <Td> 0.62 (15.7) </Td> <Td> 14.37 (365) </Td> </Tr> <Tr> <Th> Average snowfall inches (cm) </Th> <Td> 10.0 (25.4) </Td> <Td> 5.7 (14.5) </Td> <Td> 6.2 (15.7) </Td> <Td> 3.7 (9.4) </Td> <Td> 1.3 (3.3) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0.2 (0.5) </Td> <Td> 2.6 (6.6) </Td> <Td> 6.1 (15.5) </Td> <Td> 9.5 (24.1) </Td> <Td> 45.3 (115.1) </Td> </Tr> <Tr> <Th> Average precipitation days (≥ 0.01 in) </Th> <Td> 7.5 </Td> <Td> 6.0 </Td> <Td> 7.6 </Td> <Td> 7.7 </Td> <Td> 10.0 </Td> <Td> 11.5 </Td> <Td> 9.0 </Td> <Td> 8.2 </Td> <Td> 7.4 </Td> <Td> 6.3 </Td> <Td> 6.7 </Td> <Td> 8.6 </Td> <Td> 96.5 </Td> </Tr> <Tr> <Th> Average snowy days (≥ 0.1 in) </Th> <Td> 8.7 </Td> <Td> 6.4 </Td> <Td> 6.0 </Td> <Td> 2.4 </Td> <Td> 0.8 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0.1 </Td> <Td> 1.8 </Td> <Td> 5.9 </Td> <Td> 9.1 </Td> <Td> 41.2 </Td> </Tr> <Tr> <Th> Average relative humidity (%) </Th> <Td> 76.2 </Td> <Td> 75.6 </Td> <Td> 72.5 </Td> <Td> 61.4 </Td> <Td> 58.5 </Td> <Td> 59.6 </Td> <Td> 56.1 </Td> <Td> 54.9 </Td> <Td> 61.1 </Td> <Td> 65.2 </Td> <Td> 74.9 </Td> <Td> 77.1 </Td> <Td> 66.1 </Td> </Tr> <Tr> <Th> Mean monthly sunshine hours </Th> <Td> 144.5 </Td> <Td> 169.7 </Td> <Td> 227.3 </Td> <Td> 250.3 </Td> <Td> 297.9 </Td> <Td> 326.0 </Td> <Td> 366.3 </Td> <Td> 331.5 </Td> <Td> 249.5 </Td> <Td> 197.1 </Td> <Td> 122.2 </Td> <Td> 125.5 </Td> <Td> 2,807.8 </Td> </Tr> <Tr> <Th> Percent possible sunshine </Th> <Td> 53 </Td> <Td> 59 </Td> <Td> 62 </Td> <Td> 61 </Td> <Td> 63 </Td> <Td> 68 </Td> <Td> 76 </Td> <Td> 75 </Td> <Td> 66 </Td> <Td> 59 </Td> <Td> 44 </Td> <Td> 48 </Td> <Td> 63 </Td> </Tr> <Tr> <Td_colspan="14"> Source: NOAA (relative humidity 1962--1990, sun 1961--1990) </Td> </Tr> </Table> <Tr> <Th_colspan="14"> (show) Climate data for Williston, North Dakota (Sloulin Int'l), 1981--2010 normals, extremes 1894--present </Th> </Tr> <Tr> <Th> Month </Th> <Th> Jan </Th> <Th> Feb </Th> <Th> Mar </Th> <Th> Apr </Th> <Th> May </Th> <Th> Jun </Th> <Th> Jul </Th> <Th> Aug </Th> <Th> Sep </Th> <Th> Oct </Th> <Th> Nov </Th> <Th> Dec </Th> <Th> Year </Th> </Tr>

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