Weather observations for the past three days for
Chester County Airport
Metric (Imperial)
Date Time (edt) Wind (kph) Vis. (km) Weather Sky Cond. Temperature (ºC) Relative Humidity Wind Chill (°C) Heat Index (°C) Pressure Precipitation (cm)
Air Dwpt 6 hour altimeter (cm) sea level (mb) 1 hr 3 hr 6 hr
Max. Min.
14 12:35 NW 30 16.09 Mostly Cloudy BKN040 BKN360 15.2 7.2 59% 75.69 0.0
14 12:15 NW 26 G 31 16.09 Mostly Cloudy BKN037 14.1 6.7 61% 75.69 0.0
14 11:55 NW 20 G 30 16.09 Mostly Cloudy BKN036 BKN043 13.7 7 64% 75.72 0.0
14 11:35 NW 20 16.09 Mostly Cloudy FEW031 BKN042 14.6 8.1 65% 75.72 0.0
14 11:15 NW 11 16.09 Mostly Cloudy BKN030 BKN044 13.9 7.4 65% 75.72 0.0
14 10:55 NW 22 16.09 Mostly Cloudy BKN029 BKN090 13.5 7.3 66% 75.72 0.0
14 10:35 NW 19 16.09 Overcast SCT029 OVC090 13.1 8 71% 75.72 0.0
14 10:15 NW 19 16.09 Overcast FEW028 OVC090 13.3 8.4 72% 75.74 0.0
14 09:55 NW 19 16.09 Overcast OVC085 12.3 8 75% 75.74 0.0
14 09:35 NW 19 16.09 Overcast FEW020 OVC090 11.9 8.3 79% 75.72 0.0
14 09:15 NW 22 16.09 Overcast SCT019 OVC090 11.6 8.6 82% 75.72 0.0
14 08:55 NW 15 16.09 Mostly Cloudy BKN085 10.7 9 89% 75.72 0.0
14 08:35 NW 15 16.09 Overcast OVC080 10.6 9.6 94% 75.72 0.0
14 08:15 NW 13 14.48 Overcast OVC080 10.7 9.8 94% 75.69 0.0
14 07:55 NW 17 16.09 Overcast OVC065 10.6 10 11.2 10.6 96% 75.69 0.0
14 07:35 N 7 16.09 Overcast FEW009 OVC065 10.7 10.5 99% 75.69 0.0
14 07:15 NW 9 14.48 Overcast FEW008 OVC060 10.8 10.8 100% 75.69 0.0
14 06:55 NW 15 16.09 Overcast OVC060 10.9 10.9 100% 75.67 0.0
14 06:35 NW 15 14.48 Overcast BKN060 OVC095 10.8 10.8 100% 75.67 0.0
14 06:15 NW 13 12.87 Overcast FEW060 OVC085 10.8 10.8 100% 75.64 0.0
14 05:55 NW 15 12.87 Mostly Cloudy FEW007 BKN080 BKN130 10.8 10.8 100% 75.62 0.0
14 05:35 NW 13 12.87 Overcast BKN005 OVC080 10.9 10.9 100% 75.62 0.0
14 05:15 NW 11 8.05 Fog/Mist OVC004 11 11 100% 75.62 0.0
14 04:55 W 7 6.44 Fog/Mist OVC003 10.9 10.9 100% 75.62 0.0
14 04:35 NW 11 4.83 Fog/Mist OVC003 10.9 10.9 100% 75.57 0.0
14 04:15 NW 19 6.44 Fog/Mist OVC004 11 11 100% 75.57 0.0
14 03:55 NW 15 11.27 Overcast OVC004 10.9 10.9 100% 75.62 0.0
14 03:35 NW 17 11.27 Overcast OVC004 11 11 100% 75.62 0.0
14 03:15 NW 13 16.09 Overcast OVC004 10.9 10.9 100% 75.62 0.0
14 02:55 NW 6 11.27 Overcast OVC003 11.1 11.1 100% 75.64 0.0
14 02:35 W 6 8.05 Fog/Mist BKN002 OVC010 11 11 100% 75.64 0.0
14 02:15 Calm 14.48 Overcast OVC009 11.1 11.1 100% 75.64 0.0
14 01:55 W 7 14.48 Mostly Cloudy SCT007 BKN150 BKN170 11.2 11.2 18.2 11.1 100% 75.69 0.0 1.07
14 01:35 W 7 14.48 Overcast FEW004 SCT085 BKN150 OVC170 11.1 11.1 100% 75.67 0.0
14 01:15 W 9 9.66 Fog/Mist FEW004 BKN090 BKN100 BKN120 11.3 11.3 100% 75.69 0.0
14 00:55 NW 7 9.66 Fog/Mist SCT005 BKN032 BKN120 11.2 11.2 100% 75.72 0.0 0.03
14 00:35 NW 9 9.66 Fog/Mist SCT003 BKN033 BKN085 OVC110 11.3 11.3 100% 75.74 0.0 0.03
14 00:15 Calm 9.66 Fog/Mist FEW033 BKN085 11.3 11.3 100% 75.74 0.0 0.03
13 23:55 Calm 11.27 Overcast SCT055 BKN080 OVC095 11.3 11.3 100% 75.72 0.0 0.15
13 23:35 Calm 9.66 Light Rain Fog/Mist BKN060 OVC075 11.3 11.3 100% 75.72 0.0 0.15
13 23:15 SE 7 4.83 Light Rain Fog/Mist OVC070 11.3 11.3 100% 75.74 0.0 0.13
13 22:55 SE 13 4.02 Light Rain Fog/Mist OVC075 11.4 11.4 100% 75.72 0.0 0.43 0.89
13 22:35 SE 7 2.82 Light Rain Fog/Mist OVC075 11.5 11.5 100% 75.74 0.0 0.3
13 22:15 W 7 4.83 Thunderstorm Rain Fog/Mist OVC065 11.6 11.6 100% 75.77 0.0 0.2
13 21:55 NW 28 G 50 1.21 Thunderstorm Heavy Rain Fog/Mist FEW028 BKN042 OVC065 12 11.3 96% 75.79 0.0 0.46
13 21:35 NW 44 G 54 16.09 Mostly Cloudy and Windy FEW029 SCT047 BKN060 BKN120 16 10.7 71% 75.77 0.0
13 21:15 SW 13 16.09 Fair CLR 16.8 11.2 70% 75.67 0.0
13 20:55 Vrbl 11 16.09 Fair CLR 17 11 68% 75.64 0.0
13 20:35 Vrbl 11 16.09 A Few Clouds FEW160 17.3 11.1 67% 75.64 0.0
13 20:15 Vrbl 11 14.48 Partly Cloudy FEW160 SCT190 17.7 10.9 65% 75.67 0.0
13 19:55 Vrbl 11 14.48 Overcast OVC170 18.5 11.3 20.5 18.5 63% 75.62 0.0
13 19:35 S 13 G 28 14.48 Overcast FEW100 OVC150 18.8 11.2 62% 75.62 0.0
13 19:15 S 15 14.48 Overcast FEW080 BKN100 OVC160 19 11.1 60% 75.62 0.0
13 18:55 SW 17 G 37 12.87 Overcast BKN085 OVC150 19.5 10.9 58% 75.64 0.0
13 18:35 S 11 14.48 Overcast SCT080 OVC150 19.8 10.7 56% 75.64 0.0
13 18:15 Vrbl 11 12.87 Overcast OVC150 20 10.4 54% 75.64 0.0
13 17:55 S 13 14.48 Overcast OVC150 20.1 10.4 54% 75.67 0.0
13 17:35 S 11 G 35 14.48 Overcast FEW110 OVC150 20 9.9 52% 75.67 0.0
13 17:15 S 20 G 31 14.48 Mostly Cloudy BKN150 BKN170 20.1 9.4 50% 75.69 0.0
13 16:55 S 17 G 39 14.48 Mostly Cloudy BKN120 BKN160 20.2 9.4 50% 75.72 0.0
13 16:35 S 17 G 28 14.48 Overcast OVC120 20 9.2 50% 75.72 0.0
13 16:15 SW 17 16.09 Overcast OVC120 20.3 9.1 49% 75.74 0.0
13 15:55 S 20 G 39 14.48 Overcast OVC120 19.6 8.1 48% 75.77 0.0
13 15:35 S 15 G 35 14.48 Mostly Cloudy FEW100 BKN130 19.8 8 47% 75.77 0.0
13 15:15 S 17 G 44 14.48 Mostly Cloudy FEW100 BKN150 19.7 7.4 45% 75.82 0.0
13 14:55 SW 15 G 31 16.09 Mostly Cloudy BKN085 BKN150 BKN210 20.4 7.6 44% 75.84 0.0
13 14:35 SW 19 G 35 14.48 Overcast BKN085 OVC150 19.6 7.2 45% 75.84 0.0
13 14:15 S 17 G 35 14.48 Overcast FEW090 OVC150 20.2 7 43% 75.87 0.0
13 13:55 S 15 G 33 14.48 Mostly Cloudy SCT085 BKN160 BKN210 19.2 6.4 20 15.3 43% 75.87 0.0
13 13:35 SW 17 G 41 14.48 Mostly Cloudy SCT170 BKN200 BKN220 19.2 6.6 44% 75.9 0.0
13 13:15 S 17 G 37 14.48 Overcast BKN160 OVC190 19.8 6.9 43% 75.92 0.0
13 12:55 S 17 G 28 14.48 Overcast OVC160 19.1 7 46% 75.95 0.0
13 12:35 SW 17 G 31 14.48 Mostly Cloudy BKN170 19.2 6.6 44% 75.95 0.0
13 12:15 SW 11 G 31 14.48 A Few Clouds FEW170 19 6.6 45% 75.95 0.0
13 11:55 Vrbl 11 14.48 Partly Cloudy SCT160 19.5 7.5 46% 76 0.0
13 11:35 Vrbl 9 14.48 Overcast OVC160 18.7 7.5 48% 76 0.0
13 11:15 S 13 14.48 Partly Cloudy SCT160 SCT220 18.5 7.6 49% 76.02 0.0
13 10:55 S 15 14.48 Partly Cloudy FEW270 SCT370 18.6 7.7 49% 76.05 0.0
13 10:35 Vrbl 11 16.09 Partly Cloudy FEW085 SCT260 SCT350 18.1 7.4 50% 76.05 0.0
13 10:15 S 17 16.09 Mostly Cloudy SCT085 BKN270 17.7 7.2 50% 76.05 0.0
13 09:55 Vrbl 11 14.48 A Few Clouds FEW090 17.9 7.4 50% 76.07 0.0
13 09:35 SW 15 16.09 Fair CLR 17.4 7.5 52% 76.07 0.0
13 09:15 Vrbl 11 16.09 Fair CLR 17 7.4 53% 76.1 0.0
13 08:55 SW 13 16.09 Fair CLR 16.4 6.7 53% 76.12 0.0
13 08:35 SW 15 14.48 Fair CLR 16 6.6 54% 76.12 0.0
13 08:15 Vrbl 7 16.09 Fair CLR 15.5 6.8 56% 76.12 0.0
13 07:55 SW 13 16.09 Fair CLR 15 6.7 15 10.7 58% 76.1 0.0
13 07:35 Vrbl 7 16.09 Fair CLR 14.6 6.7 59% 76.1 0.0
13 07:15 Vrbl 11 16.09 Fair CLR 14.1 6.9 62% 76.12 0.0
13 06:55 Vrbl 9 14.48 Partly Cloudy SCT160 13.4 7.1 66% 76.12 0.0
13 06:35 Vrbl 7 14.48 Partly Cloudy FEW140 SCT160 13.5 7.2 66% 76.12 0.0
13 06:15 SW 11 14.48 Mostly Cloudy BKN160 13.2 8 71% 76.1 0.0
13 05:55 Vrbl 7 16.09 Overcast OVC160 12.5 8.9 79% 76.12 0.0
13 05:35 Vrbl 7 16.09 Overcast OVC150 12.3 9.3 82% 76.12 0.0
13 05:15 Vrbl 7 16.09 Overcast OVC150 12.2 9.4 83% 76.15 0.0
13 04:55 Vrbl 6 16.09 Mostly Cloudy BKN160 BKN190 11.9 9.4 85% 76.17 0.0
13 04:35 Vrbl 6 16.09 Mostly Cloudy BKN180 11.9 9.4 85% 76.17 0.0
13 03:55 Calm 16.09 Overcast BKN120 OVC140 11.2 8.6 84% 76.23 0.0
13 03:35 Calm 16.09 Overcast BKN120 OVC150 11.1 8.3 83% 76.23 0.0
13 03:15 Calm 16.09 Overcast BKN130 OVC160 10.9 7.8 81% 76.25 0.0
13 02:55 Vrbl 6 16.09 Overcast BKN140 OVC160 10.9 7.6 80% 76.25 0.0
13 02:35 Vrbl 6 16.09 Overcast OVC150 10.9 7.4 79% 76.28 0.0
13 02:15 Vrbl 6 16.09 Overcast OVC150 10.7 7.3 80% 76.3 0.0
13 01:55 SE 6 16.09 A Few Clouds FEW160 10.8 7.3 15 10.5 79% 76.33 0.0
13 01:35 SE 7 16.09 A Few Clouds FEW075 11.1 7.4 78% 76.35 0.0
13 01:15 Vrbl 6 16.09 Mostly Cloudy BKN075 11.1 7.5 79% 76.38 0.0
13 00:55 Calm 16.09 A Few Clouds FEW075 11.1 7.5 79% 76.4 0.0
13 00:35 Calm 16.09 A Few Clouds FEW070 10.9 7.6 80% 76.4 0.0
13 00:15 Vrbl 6 16.09 Mostly Cloudy BKN070 11.4 7.7 78% 76.4 0.0
12 23:55 Vrbl 6 16.09 Fair CLR 11.4 8.1 80% 76.43 0.0
12 23:35 Vrbl 7 16.09 Fair CLR 11.5 7.9 79% 76.43 0.0
12 23:15 Calm 16.09 Fair CLR 11.2 7.6 79% 76.45 0.0
12 22:55 Vrbl 6 16.09 Fair CLR 11.9 6.4 69% 76.45 0.0
12 22:35 Vrbl 7 16.09 Fair CLR 12.3 5.2 62% 76.48 0.0
12 22:15 Calm 16.09 Fair CLR 12.7 4.1 56% 76.48 0.0
12 21:55 Vrbl 6 16.09 Fair CLR 13.2 3.9 54% 76.45 0.0
12 21:35 Calm 16.09 Fair CLR 13.2 3.7 53% 76.45 0.0
12 21:15 Vrbl 6 16.09 Fair CLR 13.5 3.4 51% 76.45 0.0
12 20:55 Vrbl 6 16.09 Fair CLR 14.2 2.8 46% 76.45 0.0
12 20:35 Vrbl 6 14.48 Fair CLR 14 3 48% 76.45 0.0
12 20:15 Calm 16.09 Fair CLR 14.3 3 47% 76.45 0.0
12 19:55 Calm 16.09 Fair CLR 15.4 3 18.6 15.4 44% 76.45 0.0
12 19:35 Vrbl 6 16.09 Fair CLR 15.7 3.2 43% 76.45 0.0
12 19:15 Vrbl 6 16.09 Fair CLR 16.4 2.9 41% 76.45 0.0
12 18:55 Vrbl 6 16.09 Fair CLR 17 2.9 39% 76.43 0.0
12 18:35 Vrbl 7 16.09 Fair CLR 17.1 2.6 38% 76.45 0.0
12 18:15 Vrbl 7 16.09 Fair CLR 17.5 2.6 37% 76.45 0.0
12 17:55 Vrbl 9 16.09 Fair CLR 18.5 2.1 34% 76.43 0.0
12 17:35 Calm 16.09 Fair CLR 18.2 1.8 34% 76.45 0.0
12 17:15 Vrbl 9 16.09 Fair CLR 18.3 2.2 34% 76.45 0.0
12 16:55 NW 13 16.09 Fair CLR 18.1 1.8 34% 76.48 0.0
12 16:35 NW 11 16.09 Fair CLR 18 1.6 33% 76.48 0.0
12 16:15 NW 22 16.09 A Few Clouds FEW340 18 1.5 33% 76.48 0.0
12 15:55 NW 17 16.09 Fair CLR 17.7 1.2 33% 76.5 0.0
12 15:35 NW 17 16.09 Fair CLR 17.5 1.4 34% 76.53 0.0
12 15:15 W 13 16.09 Fair CLR 17 0.9 34% 76.53 0.0
12 14:55 Vrbl 6 16.09 Fair CLR 16.7 0.2 33% 76.56 0.0
12 14:35 NW 17 16.09 Fair CLR 16.7 0.5 34% 76.58 0.0
12 14:15 Vrbl 9 16.09 Fair CLR 16 -0.6 32% 76.58 0.0
12 13:55 Vrbl 11 16.09 A Few Clouds FEW370 15.7 -0.9 16.4 9.3 32% 76.63 0.0
12 13:35 NW 20 16.09 A Few Clouds FEW370 16.3 -0.4 32% 76.63 0.0
12 13:15 W 19 G 28 16.09 A Few Clouds FEW360 15.4 -1.6 31% 76.63 0.0
12 12:55 NW 17 16.09 Fair CLR 15.7 -0.5 33% 76.66 0.0
12 12:35 NW 13 16.09 Fair CLR 14.6 -2.1 32% 76.68 0.0
12 12:15 W 15 16.09 A Few Clouds FEW380 15 -2 31% 76.68 0.0
12 11:55 W 15 16.09 Fair CLR 14.2 -2.1 33% 76.71 0.0
12 11:35 N 9 16.09 Fair CLR 14.1 -2.1 33% 76.73 0.0
12 11:15 Vrbl 9 16.09 Fair CLR 13.6 -3 32% 76.73 0.0
12 10:55 NW 11 16.09 Fair CLR 13.3 -2.8 33% 76.76 0.0
12 10:35 E 9 16.09 Fair CLR 12.9 -2.8 34% 76.76 0.0
12 10:15 E 11 16.09 Fair CLR 12.3 -3.5 33% 76.76 0.0
12 09:15 Vrbl 11 16.09 Fair CLR 11.3 -2.5 38% 76.78 0.0
12 08:55 N 15 16.09 Fair CLR 10.9 -2 41% 76.78 0.0
12 08:35 N 17 16.09 Fair CLR 10.2 -1.9 43% 76.76 0.0
12 08:15 N 11 16.09 Fair CLR 9.7 -1.3 47% 8 76.78 0.0
12 07:55 N 13 16.09 Fair CLR 8.9 -1.7 9.6 5.5 48% 7 76.78 0.0
12 07:35 N 9 16.09 Fair CLR 8.8 -1.4 49% 8 76.76 0.0
12 07:15 N 11 16.09 Fair CLR 7.9 -1.8 51% 6 76.73 0.0
12 06:55 N 9 16.09 Fair CLR 6.8 -2.2 53% 5 76.73 0.0
12 06:35 N 7 16.09 Fair CLR 6.2 -2.4 54% 5 76.71 0.0
12 06:15 N 7 16.09 Fair CLR 6.3 -2.7 53% 5 76.71 0.0
12 05:55 NW 6 16.09 Fair CLR 5.8 -2.6 55% 76.68 0.0
12 05:35 NW 6 16.09 Fair CLR 6.3 -2.3 54% 76.68 0.0
12 05:15 N 7 16.09 Fair CLR 6.4 -1.8 56% 5 76.66 0.0
12 04:35 N 9 16.09 Fair CLR 6.4 -1.1 59% 5 76.66 0.0
12 04:15 NW 7 16.09 Fair CLR 7.5 -1.7 52% 6 76.66 0.0
12 03:55 N 9 16.09 Fair CLR 7.8 -1.1 54% 6 76.63 0.0
12 03:35 NE 7 16.09 Fair CLR 8.4 -0.7 53% 8 76.63 0.0
12 03:15 N 9 16.09 Fair CLR 8.5 0.7 58% 7 76.61 0.0
12 02:55 N 11 16.09 Fair CLR 8.6 1.9 63% 7 76.61 0.0
12 02:15 Vrbl 9 16.09 Fair CLR 9.4 1.9 60% 8 76.58 0.0
12 01:55 N 17 16.09 Fair CLR 9.8 1.8 12.7 7.9 58% 8 76.58 0.0
12 01:35 N 19 16.09 Fair CLR 10.1 1.8 57% 76.58 0.0
12 01:15 N 20 G 30 16.09 Fair CLR 10.2 1.6 55% 76.58 0.0
12 00:55 N 9 16.09 Fair CLR 8.4 3.3 71% 7 76.56 0.0
12 00:35 NW 6 16.09 A Few Clouds FEW090 9.2 3.2 66% 76.56 0.0
12 00:15 Vrbl 9 16.09 Partly Cloudy SCT090 9.8 4.5 70% 9 76.53 0.0
11 23:55 W 11 16.09 Fair CLR 9.9 3.7 66% 9 76.5 0.0
11 23:35 W 9 16.09 A Few Clouds FEW095 9.9 3.1 63% 9 76.48 0.0
11 23:15 W 9 16.09 Partly Cloudy SCT095 10 2.4 60% 9 76.5 0.0
11 22:55 W 9 16.09 Partly Cloudy SCT090 10.6 1.4 53% 76.48 0.0
11 22:35 W 9 16.09 Partly Cloudy SCT080 SCT100 11 0.7 49% 76.48 0.0
11 22:15 W 6 16.09 Mostly Cloudy BKN090 BKN100 11.4 0.5 47% 76.48 0.0
11 21:55 SW 6 16.09 Partly Cloudy SCT085 11.7 0.1 45% 76.45 0.0
11 21:35 SW 6 16.09 A Few Clouds FEW090 11.7 0.1 45% 76.45 0.0
11 21:15 Calm 16.09 Fair CLR 11.8 0.3 45% 76.45 0.0
11 20:55 SW 6 16.09 Partly Cloudy SCT100 12.3 0.2 44% 76.43 0.0
11 20:35 SW 6 16.09 Partly Cloudy SCT100 12.4 0.1 43% 76.4 0.0
11 20:15 SW 6 16.09 Fair CLR 12.6 0.1 43% 76.4 0.0
11 19:55 SW 6 16.09 Fair CLR 13.1 0.1 15.6 12.9 41% 76.4 0.0
11 19:35 SW 6 16.09 A Few Clouds FEW090 13.7 -0.3 38% 76.4 0.0
11 19:15 Calm 16.09 Fair CLR 14 0.1 39% 76.4 0.0
11 18:55 W 6 16.09 Fair CLR 14.5 0.4 38% 76.4 0.0
11 18:35 W 7 16.09 Fair CLR 14.7 -0.1 37% 76.38 0.0
11 18:15 W 7 16.09 Fair CLR 14.8 0 37% 76.38 0.0
11 17:55 Vrbl 7 16.09 Fair CLR 15.3 -0.2 35% 76.38 0.0
11 17:35 W 15 16.09 Fair CLR 15.3 -0.4 34% 76.38 0.0
11 17:15 NW 9 16.09 Fair CLR 15.1 -0.9 34% 76.38 0.0
11 16:55 Vrbl 6 16.09 Fair CLR 14.6 -1 34% 76.38 0.0
11 16:35 W 15 16.09 A Few Clouds FEW260 15.1 -0.6 34% 76.38 0.0
11 16:15 NW 11 16.09 Partly Cloudy SCT250 14.4 0.2 38% 76.4 0.0
11 15:55 NW 13 16.09 A Few Clouds FEW220 14 -0.5 37% 76.43 0.0
11 15:35 Calm 16.09 Partly Cloudy SCT210 SCT360 13.9 -1.2 36% 76.43 0.0
11 15:15 Calm 16.09 Mostly Cloudy BKN210 BKN320 13.4 -1.9 35% 76.45 0.0
11 14:55 N 9 16.09 Partly Cloudy SCT190 SCT350 13.3 -0.6 39% 76.48 0.0
11 14:35 NW 7 16.09 Mostly Cloudy SCT180 SCT200 BKN350 BKN370 13.4 -2.3 34% 76.5 0.0
11 14:15 NE 11 16.09 Mostly Cloudy BKN180 BKN200 13.1 -2.1 35% 76.5 0.0
11 13:55 N 7 16.09 Overcast BKN160 OVC190 13 -2.1 13 10.3 35% 76.53 0.0
11 13:35 Vrbl 6 16.09 Overcast OVC150 12.5 -1.9 37% 76.56 0.0
11 13:15 Calm 16.09 Overcast BKN140 OVC170 12.5 -1.3 39% 76.56 0.0
11 12:55 NE 6 16.09 Partly Cloudy SCT140 SCT350 12.2 -1.8 38% 76.56 0.0
Date Time (edt) Wind (kph) Vis. (km) Weather Sky Cond. Air Dwpt Max. Min. Relative Humidity Wind Chill (°C) Heat Index (°C) altimeter (cm) sea level (mb) 1 hr 3 hr 6 hr
6 hour
Temperature (ºC) Pressure Precipitation (cm)