MONTHLY CLIMATOLOGICAL SUMMARY for SEP. 2026 NAME: Gebze CITY: Istanbul STATE: Turkey ELEV: 280 m LAT: 40° 50' 50" N LONG: 29° 32' 32" E TEMPERATURE (°C), RAIN (mm), WIND SPEED (kt) HEAT COOL AVG MEAN DEG DEG WIND DOM DAY TEMP HIGH TIME LOW TIME DAYS DAYS RAIN SPEED HIGH TIME DIR ------------------------------------------------------------------------------------ 1 22.7 28.5 14:40 18.5 4:00 0.0 4.4 0.0 5.8 21.7 17:40 NE 2 22.1 27.8 14:30 17.8 5:50 0.0 3.8 0.0 6.6 20.9 17:20 NE 3 21.7 26.3 14:30 17.4 6:30 0.0 3.4 0.0 8.3 24.3 15:20 NNE 4 21.7 25.9 13:10 18.1 5:20 0.0 3.4 0.0 8.5 25.2 16:50 NNE 5 22.8 28.6 14:20 18.4 3:40 0.0 4.5 0.0 5.7 19.1 16:30 NE 6 23.1 29.6 14:00 18.9 7:00 0.0 4.8 0.0 5.4 21.7 18:20 ENE 7 21.6 25.9 14:40 17.7 23:00 0.0 3.3 0.0 9.1 24.3 14:40 NE 8 19.8 24.4 14:20 16.5 7:00 0.3 1.8 0.0 9.4 25.2 15:40 NE 9 20.9 26.1 13:20 17.8 7:00 0.0 2.7 0.0 8.1 21.7 15:30 ENE 10 21.7 28.0 13:50 18.2 7:10 0.0 3.3 0.0 5.2 19.1 15:10 NE 11 21.1 27.3 14:40 17.5 2:40 0.1 2.9 0.2 5.4 20.0 17:00 NNE 12 21.5 29.0 16:00 17.3 6:40 0.1 3.3 0.0 3.6 18.3 16:10 NE 13 20.1 25.3 14:30 16.3 4:40 0.1 1.9 0.0 6.5 23.5 17:20 N 14 18.8 22.9 15:20 17.0 23:50 0.5 1.1 0.0 6.9 20.0 15:50 N 15 18.7 22.0 14:10 15.8 3:30 0.6 0.9 0.0 7.7 22.6 18:10 NE 16 16.8 17.7 3:30 15.9 9:10 1.5 0.0 3.0 5.0 17.4 0:30 NE 17 18.1 22.6 15:20 15.3 3:30 1.0 0.8 0.0 5.4 20.9 18:20 NE 18 17.5 19.7 13:40 15.4 2:30 1.0 0.2 1.4 5.6 21.7 14:00 NNE 19 19.5 23.5 14:40 17.0 3:10 0.2 1.4 0.0 7.7 20.9 17:20 ENE 20 19.9 23.9 15:10 17.6 0:40 0.1 1.7 0.0 8.0 22.6 16:50 NNE 21 20.3 25.5 17:00 16.9 7:40 0.2 2.3 0.0 2.7 12.2 16:20 SSE 22 17.8 19.9 1:30 14.8 00:00 0.8 0.2 12.8 4.1 18.3 10:20 N 23 13.6 15.1 0:50 12.8 10:40 2.1 0.0 10.0 2.0 18.3 1:50 N 24 15.1 17.9 16:50 11.9 4:50 2.6 0.0 0.0 3.8 13.0 19:40 SSE 25 16.6 21.1 14:20 13.4 2:40 2.1 0.4 0.0 7.0 20.9 15:40 ENE 26 18.4 22.2 13:00 15.7 7:40 0.8 0.9 0.0 8.6 25.2 17:50 NE 27 17.7 20.6 15:00 15.9 00:00 1.0 0.4 2.0 8.5 22.6 5:40 NNE 28 15.6 16.7 10:50 14.7 17:10 2.8 0.0 35.0 8.3 26.1 12:20 N 29 15.5 16.8 10:40 14.6 5:40 2.2 0.0 10.4 6.7 20.9 5:40 NNE 30 15.9 18.5 14:00 13.9 00:00 2.2 0.0 1.6 9.3 38.3 16:10 NE ------------------------------------------------------------------------------------- 19.2 29.6 6 11.9 24 22.3 53.9 76.4 6.5 38.3 30 NE Max >= 32.0: 0 Max <= 0.0: 0 Min <= 0.0: 0 Min <= -18.0: 0 Max Rain: 35.00 ON 28/09/26 Days of Rain: 9 (> .2 mm) 6 (> 2 mm) 1 (> 20 mm) Heat Base: 18.3 Cool Base: 18.3 Method: Integration