<Tr> <Th> Percent possible sunshine </Th> <Td> 31 </Td> <Td> 37 </Td> <Td> 44 </Td> <Td> 51 </Td> <Td> 57 </Td> <Td> 63 </Td> <Td> 66 </Td> <Td> 62 </Td> <Td> 55 </Td> <Td> 47 </Td> <Td> 29 </Td> <Td> 25 </Td> <Td> 49 </Td> </Tr> <Tr> <Td_colspan="14"> Source: NOAA (relative humidity and sun 1961--1990) </Td> </Tr> <Table> <Tr> <Th_colspan="14"> hide Climate data for Islip, New York (Long Island MacArthur Airport), 1981--2010 normals, extremes 1963--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> 69 (21) </Td> <Td> 68 (20) </Td> <Td> 82 (28) </Td> <Td> 94 (34) </Td> <Td> 98 (37) </Td> <Td> 96 (36) </Td> <Td> 104 (40) </Td> <Td> 100 (38) </Td> <Td> 94 (34) </Td> <Td> 88 (31) </Td> <Td> 78 (26) </Td> <Td> 77 (25) </Td> <Td> 104 (40) </Td> </Tr> <Tr> <Th> Mean maximum ° F (° C) </Th> <Td> 57.3 (14.1) </Td> <Td> 56.6 (13.7) </Td> <Td> 66.9 (19.4) </Td> <Td> 77.2 (25.1) </Td> <Td> 84.7 (29.3) </Td> <Td> 89.6 (32) </Td> <Td> 93.3 (34.1) </Td> <Td> 90.8 (32.7) </Td> <Td> 85.4 (29.7) </Td> <Td> 77.0 (25) </Td> <Td> 68.4 (20.2) </Td> <Td> 60.3 (15.7) </Td> <Td> 95.1 (35.1) </Td> </Tr> <Tr> <Th> Average high ° F (° C) </Th> <Td> 38.0 (3.3) </Td> <Td> 40.3 (4.6) </Td> <Td> 47.3 (8.5) </Td> <Td> 57.6 (14.2) </Td> <Td> 67.5 (19.7) </Td> <Td> 76.6 (24.8) </Td> <Td> 81.7 (27.6) </Td> <Td> 80.4 (26.9) </Td> <Td> 73.8 (23.2) </Td> <Td> 63.0 (17.2) </Td> <Td> 53.2 (11.8) </Td> <Td> 43.0 (6.1) </Td> <Td> 60.3 (15.7) </Td> </Tr> <Tr> <Th> Average low ° F (° C) </Th> <Td> 23.3 (− 4.8) </Td> <Td> 25.2 (− 3.8) </Td> <Td> 31.3 (− 0.4) </Td> <Td> 40.6 (4.8) </Td> <Td> 49.8 (9.9) </Td> <Td> 60.2 (15.7) </Td> <Td> 66.0 (18.9) </Td> <Td> 65.3 (18.5) </Td> <Td> 57.5 (14.2) </Td> <Td> 45.5 (7.5) </Td> <Td> 37.1 (2.8) </Td> <Td> 28.2 (− 2.1) </Td> <Td> 44.3 (6.8) </Td> </Tr> <Tr> <Th> Mean minimum ° F (° C) </Th> <Td> 6.3 (− 14.3) </Td> <Td> 10.4 (− 12) </Td> <Td> 16.2 (− 8.8) </Td> <Td> 28.7 (− 1.8) </Td> <Td> 37.1 (2.8) </Td> <Td> 48.3 (9.1) </Td> <Td> 56.4 (13.6) </Td> <Td> 54.6 (12.6) </Td> <Td> 44.3 (6.8) </Td> <Td> 32.4 (0.2) </Td> <Td> 22.9 (− 5.1) </Td> <Td> 13.1 (− 10.5) </Td> <Td> 4.3 (− 15.4) </Td> </Tr> <Tr> <Th> Record low ° F (° C) </Th> <Td> − 8 (− 22) </Td> <Td> − 14 (− 26) </Td> <Td> 0 (− 18) </Td> <Td> 16 (− 9) </Td> <Td> 32 (0) </Td> <Td> 42 (6) </Td> <Td> 49 (9) </Td> <Td> 45 (7) </Td> <Td> 38 (3) </Td> <Td> 23 (− 5) </Td> <Td> 11 (− 12) </Td> <Td> − 1 (− 18) </Td> <Td> − 14 (− 26) </Td> </Tr> <Tr> <Th> Average precipitation inches (mm) </Th> <Td> 3.64 (92.5) </Td> <Td> 3.26 (82.8) </Td> <Td> 4.44 (112.8) </Td> <Td> 4.34 (110.2) </Td> <Td> 3.78 (96) </Td> <Td> 4.27 (108.5) </Td> <Td> 3.43 (87.1) </Td> <Td> 3.98 (101.1) </Td> <Td> 3.58 (90.9) </Td> <Td> 3.79 (96.3) </Td> <Td> 3.67 (93.2) </Td> <Td> 4.06 (103.1) </Td> <Td> 46.24 (1,174.5) </Td> </Tr> <Tr> <Th> Average snowfall inches (cm) </Th> <Td> 6.7 (17) </Td> <Td> 7.1 (18) </Td> <Td> 4.5 (11.4) </Td> <Td> 0.6 (1.5) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0 (0) </Td> <Td> 0.5 (1.3) </Td> <Td> 5.4 (13.7) </Td> <Td> 24.8 (62.9) </Td> </Tr> <Tr> <Th> Average precipitation days (≥ 0.01 in) </Th> <Td> 11.0 </Td> <Td> 9.1 </Td> <Td> 10.5 </Td> <Td> 11.3 </Td> <Td> 11.1 </Td> <Td> 10.1 </Td> <Td> 9.1 </Td> <Td> 8.5 </Td> <Td> 8.6 </Td> <Td> 8.5 </Td> <Td> 10.3 </Td> <Td> 10.8 </Td> <Td> 118.9 </Td> </Tr> <Tr> <Th> Average snowy days (≥ 0.1 in) </Th> <Td> 3.7 </Td> <Td> 3.4 </Td> <Td> 2.3 </Td> <Td> 0.3 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0 </Td> <Td> 0.2 </Td> <Td> 2.4 </Td> <Td> 12.3 </Td> </Tr> <Tr> <Td_colspan="14"> Source: NOAA </Td> </Tr> </Table> <Tr> <Th_colspan="14"> hide Climate data for Islip, New York (Long Island MacArthur Airport), 1981--2010 normals, extremes 1963--present </Th> </Tr>

When does it get cold in upstate ny