<P> Thunderstorms usually occur about 2 to 5 days per month during this period . Summer precipitation in Seoul is as likely to occur at 0200 as at 1400 . Humidity is very high and fog will develop whenever a cold air mass confronts this moisture laden air, often forming on cloudless days . The typhoon season occurs from July through September . About once each year, a typhoon will pass very close to or move over Korea, causing heavy showers . Strong winds are usually confined to islands and exposed coastal areas . Although winds might not pose a problem, the associated rainfall can cause significant flash flooding, a very real threat during the rainy season, especially in rough terrain . The mean temperature for Seoul in August is 25.7 ° C (78 ° F) </P> <P> October is the transition month between the summer rainy season and the cold, dry winter . The predominantly tropical cloudy weather of the summer is replaced by cooler, drier, and less cloudy conditions . The primary weather producers during October are cold frontal systems from the Asian mainland . On the average, one frontal passage per week can be expected during the month . A typical frontal passage is proceeded by increasing middle and high cloudiness with light rain . Following the frontal passage, mostly clear skies can be expected for 3 or 4 days . During this clear period it is very likely for fog to form . Fog is especially prevalent in river valleys and in low - lying areas . </P> <Table> <Tr> <Th_colspan="14"> hide Climate data for Seoul (normals 1981--2010, extremes 1907--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 ° C (° F) </Th> <Td> 14.4 (57.9) </Td> <Td> 18.7 (65.7) </Td> <Td> 23.8 (74.8) </Td> <Td> 29.8 (85.6) </Td> <Td> 34.4 (93.9) </Td> <Td> 37.2 (99) </Td> <Td> 38.4 (101.1) </Td> <Td> 39.6 (103.3) </Td> <Td> 35.1 (95.2) </Td> <Td> 30.1 (86.2) </Td> <Td> 25.9 (78.6) </Td> <Td> 17.7 (63.9) </Td> <Td> 39.6 (103.3) </Td> </Tr> <Tr> <Th> Average high ° C (° F) </Th> <Td> 1.5 (34.7) </Td> <Td> 4.7 (40.5) </Td> <Td> 10.4 (50.7) </Td> <Td> 17.8 (64) </Td> <Td> 23.0 (73.4) </Td> <Td> 27.1 (80.8) </Td> <Td> 28.6 (83.5) </Td> <Td> 29.6 (85.3) </Td> <Td> 25.8 (78.4) </Td> <Td> 19.8 (67.6) </Td> <Td> 11.6 (52.9) </Td> <Td> 4.3 (39.7) </Td> <Td> 17.0 (62.6) </Td> </Tr> <Tr> <Th> Daily mean ° C (° F) </Th> <Td> − 2.4 (27.7) </Td> <Td> 0.4 (32.7) </Td> <Td> 5.7 (42.3) </Td> <Td> 12.5 (54.5) </Td> <Td> 17.8 (64) </Td> <Td> 22.2 (72) </Td> <Td> 24.9 (76.8) </Td> <Td> 25.7 (78.3) </Td> <Td> 21.2 (70.2) </Td> <Td> 14.8 (58.6) </Td> <Td> 7.2 (45) </Td> <Td> 0.4 (32.7) </Td> <Td> 12.5 (54.5) </Td> </Tr> <Tr> <Th> Average low ° C (° F) </Th> <Td> − 5.9 (21.4) </Td> <Td> − 3.4 (25.9) </Td> <Td> 1.6 (34.9) </Td> <Td> 7.8 (46) </Td> <Td> 13.2 (55.8) </Td> <Td> 18.2 (64.8) </Td> <Td> 21.9 (71.4) </Td> <Td> 22.4 (72.3) </Td> <Td> 17.2 (63) </Td> <Td> 10.3 (50.5) </Td> <Td> 3.2 (37.8) </Td> <Td> − 3.2 (26.2) </Td> <Td> 8.6 (47.5) </Td> </Tr> <Tr> <Th> Record low ° C (° F) </Th> <Td> − 22.5 (− 8.5) </Td> <Td> − 19.6 (− 3.3) </Td> <Td> − 14.1 (6.6) </Td> <Td> − 4.3 (24.3) </Td> <Td> 2.4 (36.3) </Td> <Td> 8.8 (47.8) </Td> <Td> 12.9 (55.2) </Td> <Td> 13.5 (56.3) </Td> <Td> 3.2 (37.8) </Td> <Td> − 5.1 (22.8) </Td> <Td> − 11.9 (10.6) </Td> <Td> − 23.1 (− 9.6) </Td> <Td> − 23.1 (− 9.6) </Td> </Tr> <Tr> <Th> Average precipitation mm (inches) </Th> <Td> 20.8 (0.819) </Td> <Td> 25.0 (0.984) </Td> <Td> 47.2 (1.858) </Td> <Td> 64.5 (2.539) </Td> <Td> 105.9 (4.169) </Td> <Td> 133.2 (5.244) </Td> <Td> 394.7 (15.539) </Td> <Td> 364.2 (14.339) </Td> <Td> 169.3 (6.665) </Td> <Td> 51.8 (2.039) </Td> <Td> 52.5 (2.067) </Td> <Td> 21.5 (0.846) </Td> <Td> 1,450.5 (57.106) </Td> </Tr> <Tr> <Th> Average precipitation days (≥ 0.1 mm) </Th> <Td> 6.5 </Td> <Td> 5.8 </Td> <Td> 7.4 </Td> <Td> 7.8 </Td> <Td> 9.0 </Td> <Td> 9.9 </Td> <Td> 16.3 </Td> <Td> 14.6 </Td> <Td> 9.1 </Td> <Td> 6.3 </Td> <Td> 8.7 </Td> <Td> 7.4 </Td> <Td> 108.8 </Td> </Tr> <Tr> <Th> Average snowy days </Th> <Td> 8.0 </Td> <Td> 5.2 </Td> <Td> 3.4 </Td> <Td> 0.1 </Td> <Td> 0.0 </Td> <Td> 0.0 </Td> <Td> 0.0 </Td> <Td> 0.0 </Td> <Td> 0.0 </Td> <Td> 0.1 </Td> <Td> 2.1 </Td> <Td> 6.1 </Td> <Td> 24.9 </Td> </Tr> <Tr> <Th> Average relative humidity (%) </Th> <Td> 59.8 </Td> <Td> 57.9 </Td> <Td> 57.8 </Td> <Td> 56.2 </Td> <Td> 62.7 </Td> <Td> 68.1 </Td> <Td> 78.3 </Td> <Td> 75.6 </Td> <Td> 69.2 </Td> <Td> 64.0 </Td> <Td> 62.0 </Td> <Td> 60.6 </Td> <Td> 64.4 </Td> </Tr> <Tr> <Th> Mean monthly sunshine hours </Th> <Td> 160.3 </Td> <Td> 163.3 </Td> <Td> 189.0 </Td> <Td> 205.0 </Td> <Td> 213.0 </Td> <Td> 182.0 </Td> <Td> 120.0 </Td> <Td> 152.5 </Td> <Td> 176.2 </Td> <Td> 198.8 </Td> <Td> 153.2 </Td> <Td> 152.6 </Td> <Td> 2,066 </Td> </Tr> <Tr> <Th> Percent possible sunshine </Th> <Td> 52.3 </Td> <Td> 53.6 </Td> <Td> 51.0 </Td> <Td> 51.9 </Td> <Td> 48.4 </Td> <Td> 41.2 </Td> <Td> 26.8 </Td> <Td> 36.2 </Td> <Td> 47.2 </Td> <Td> 57.1 </Td> <Td> 50.2 </Td> <Td> 51.1 </Td> <Td> 46.4 </Td> </Tr> <Tr> <Td_colspan="14"> Source: Korea Meteorological Administration (percent sunshine and snowy days) </Td> </Tr> </Table> <Tr> <Th_colspan="14"> hide Climate data for Seoul (normals 1981--2010, extremes 1907--present) </Th> </Tr>

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