National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
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.
30 03:55 Calm 16.09 Mostly Cloudy FEW049 BKN065 16.4 13.7 84% 76.76 0.0
30 03:35 Calm 16.09 A Few Clouds FEW070 15.4 14.2 93% 76.78 0.0
30 03:15 Calm 16.09 Fair CLR 16.7 13.6 82% 76.76 0.0
30 02:55 Calm 16.09 Partly Cloudy FEW075 SCT210 15.8 13.9 89% 76.76 0.0
30 02:35 Calm 16.09 Partly Cloudy FEW075 SCT210 15.9 13.7 87% 76.78 0.0
30 02:15 Calm 16.09 Fair CLR 16.7 13.2 80% 76.78 0.0
30 01:55 Vrbl 6 16.09 Fair CLR 17.5 13.4 20.4 14.1 77% 76.78 0.0
30 01:35 Calm 16.09 Fair CLR 15.1 13.7 91% 76.78 0.0
30 01:15 Calm 16.09 Fair CLR 14.8 13.5 92% 76.78 0.0
30 00:55 NW 7 16.09 Fair CLR 14.7 14.2 97% 76.78 0.0
30 00:35 NW 6 16.09 Fair CLR 14.1 13.9 99% 76.78 0.0
30 00:15 Calm 16.09 Fair CLR 14.9 14.1 95% 76.76 0.0
29 23:55 Calm 16.09 Fair CLR 15.2 14.5 96% 76.73 0.0
29 23:35 NW 6 16.09 Fair CLR 16 14.3 90% 76.76 0.0
29 23:15 Calm 16.09 Fair CLR 15.5 14.9 96% 76.76 0.0
29 22:55 Calm 16.09 Fair CLR 16.4 14.5 89% 76.76 0.0
29 22:35 Calm 16.09 Fair CLR 16.3 14.8 91% 76.76 0.0
29 22:15 Calm 16.09 Fair CLR 16.3 14.9 91% 76.76 0.0
29 21:55 SW 6 16.09 Fair CLR 16.7 13.6 82% 76.76 0.0
29 21:35 Calm 16.09 Fair CLR 16.7 14.2 85% 76.76 0.0
29 21:15 Calm 16.09 Fair CLR 17.3 13.4 78% 76.76 0.0
29 20:55 Calm 16.09 Fair CLR 18.1 13.3 74% 76.76 0.0
29 20:35 Calm 16.09 Fair CLR 18.3 12.7 70% 76.73 0.0
29 20:15 Calm 16.09 Fair CLR 20.1 12.3 61% 76.71 0.0
29 19:35 Calm 16.09 Fair CLR 20.3 13.1 63% 76.71 0.0
29 19:15 Calm 16.09 Fair CLR 20.9 13.4 62% 76.73 0.0
29 18:55 Calm 16.09 Fair CLR 21.9 13.8 60% 76.73 0.0
29 18:35 NW 7 16.09 Fair CLR 22.8 11.7 50% 76.73 0.0
29 18:15 Vrbl 7 16.09 Fair CLR 23.8 11.6 46% 76.76 0.0
29 17:55 W 6 16.09 Fair CLR 23.3 13 52% 76.73 0.0
29 17:35 Calm 16.09 Fair CLR 23.5 12.7 51% 76.71 0.0
29 17:15 Calm 16.09 Fair CLR 23.9 12.2 48% 25 76.73 0.0
29 16:55 Calm 16.09 Fair CLR 23.9 10.7 43% 25 76.73 0.0
29 16:35 NW 7 16.09 Fair CLR 24.5 11.5 44% 26 76.76 0.0
29 16:15 Calm 16.09 Fair CLR 23.8 11.2 45% 76.76 0.0
29 15:55 NW 11 16.09 Fair CLR 24.2 11.5 45% 25 76.81 0.0
29 15:35 NW 11 16.09 Fair CLR 24.3 11.6 45% 25 76.81 0.0
29 15:15 Calm 16.09 Fair CLR 24 11.8 46% 25 76.81 0.0
29 14:55 NW 11 16.09 Fair CLR 24 12.1 47% 25 76.81 0.0
29 14:35 Vrbl 6 16.09 Fair CLR 23.6 11.7 47% 76.84 0.0
29 14:15 Calm 16.09 Fair CLR 23.6 10.9 45% 76.84 0.0
29 13:55 Vrbl 6 16.09 Fair CLR 23.2 11.3 23.5 16.9 47% 76.86 0.0
29 13:35 Vrbl 6 16.09 Fair CLR 23.3 11.3 47% 76.86 0.0
29 12:15 N 9 16.09 Fair CLR 22 11.7 52% 76.89 0.0
29 11:55 NE 7 16.09 Fair CLR 21.5 12 55% 76.91 0.0
29 11:35 N 11 16.09 Fair CLR 21.4 12.1 56% 76.91 0.0
29 11:15 NE 9 16.09 Fair CLR 20.9 12.2 58% 76.89 0.0
29 10:55 NE 11 16.09 Fair CLR 20.7 11.8 57% 76.89 0.0
29 10:35 Vrbl 11 16.09 Fair CLR 20.5 12.2 59% 76.86 0.0
29 10:15 NE 15 16.09 Fair CLR 20 11.8 59% 76.86 0.0
29 09:55 NE 11 16.09 Fair CLR 19.5 12.3 63% 76.86 0.0
29 09:35 N 15 16.09 Fair CLR 19.2 12.5 65% 76.86 0.0
29 09:15 NE 13 16.09 Fair CLR 18.4 11.9 66% 76.84 0.0
29 08:55 NE 15 16.09 Fair CLR 18 12.2 69% 76.84 0.0
29 08:35 NE 13 16.09 Fair CLR 17.6 11.8 69% 76.84 0.0
29 08:15 NE 9 16.09 Fair CLR 17.3 11.5 69% 76.81 0.0
29 07:55 NE 9 16.09 Fair CLR 16.7 10.7 18.8 14.6 68% 76.81 0.0 0.08
29 07:35 Vrbl 9 16.09 Fair CLR 16.3 10.7 70% 76.81 0.0
29 07:15 N 7 16.09 Fair CLR 15.7 10.7 72% 76.78 0.0
29 06:55 N 7 16.09 Fair CLR 14.9 10.7 76% 76.78 0.0
29 06:35 N 6 16.09 Fair CLR 15 10.6 75% 76.73 0.0
29 06:15 N 7 16.09 Fair CLR 15.2 10.8 75% 76.73 0.0
29 05:55 Calm 16.09 Fair CLR 15.6 10.7 73% 76.73 0.0
29 05:35 N 6 16.09 Fair CLR 15.6 10.7 73% 76.71 0.0
29 05:15 N 7 16.09 Fair CLR 16.2 10.2 68% 76.68 0.0
29 04:55 N 9 16.09 Fair CLR 16.3 10.4 68% 76.68 0.0 0.08
29 04:35 N 9 16.09 Fair CLR 16.9 10.3 65% 76.66 0.0
29 04:15 N 13 16.09 Fair CLR 17 10.9 68% 76.63 0.0
29 03:55 N 11 16.09 Fair CLR 17.1 12.8 76% 76.63 0.0
29 03:35 N 9 16.09 Fair CLR 17.4 13.1 76% 76.61 0.0
29 03:15 N 11 16.09 Fair CLR 17.7 13.4 76% 76.61 0.0
29 02:55 NE 11 16.09 Fair CLR 18.1 14.2 78% 76.61 0.0 0.08
29 02:35 NE 9 16.09 Fair CLR 18.1 15.3 84% 76.61 0.0 0.08
29 02:15 N 9 16.09 Fair CLR 18.5 15.9 85% 76.58 0.0 0.05
29 01:55 N 13 16.09 Fair CLR 18.9 16.4 22.7 18.9 86% 76.58 0.0 0.18 1.52
29 01:35 N 11 16.09 Fair CLR 19.2 16.8 86% 76.58 0.0 0.13
29 01:15 N 9 16.09 A Few Clouds FEW055 19.5 17.2 87% 76.56 0.0 0.08
29 00:55 N 11 16.09 Fair CLR 19.6 17.7 89% 76.53 0.0 0.23
29 00:35 N 9 16.09 Fair CLR 20.1 17.8 87% 76.53 0.0 0.18
29 00:15 N 11 16.09 Fair CLR 20.5 18 86% 76.5 0.0 0.1
28 23:55 N 6 16.09 Fair CLR 19.8 18.2 91% 76.5 0.0 0.23
28 23:35 N 9 16.09 Fair CLR 20.3 18.3 88% 76.48 0.0 0.18
28 23:15 N 7 16.09 Fair CLR 19.3 18.7 96% 76.48 0.0 0.1
28 22:55 Calm 16.09 Fair CLR 20 19.3 96% 76.45 0.0 0.25 0.89
28 22:35 Calm 16.09 Fair CLR 19.7 19.5 99% 76.45 0.0 0.2
28 22:15 Calm 16.09 Fair CLR 20.1 19.8 98% 76.45 0.0 0.1
28 21:55 Calm 16.09 Fair CLR 20.4 19.5 95% 76.45 0.0 0.3
28 21:35 NW 6 16.09 Fair CLR 20.6 19.9 96% 76.43 0.0 0.23
28 21:15 NW 6 16.09 Fair CLR 21.2 19.7 91% 76.43 0.0 0.13
28 20:55 Calm 16.09 Fair CLR 21 19.7 92% 76.4 0.0 0.33
28 20:35 Calm 16.09 Fair CLR 21.7 19.8 89% 76.38 0.0 0.25
28 20:15 Calm 16.09 Fair CLR 22.4 20 86% 76.35 0.0 0.15
28 19:35 Calm 16.09 Fair CLR 24.3 19.6 75% 25 76.35 0.0 0.25
28 19:15 NE 6 16.09 Fair CLR 25 19.4 71% 26 76.33 0.0 0.15
28 18:55 NE 6 16.09 Fair CLR 25.6 19.4 69% 27 76.3 0.0 0.43
28 18:35 NE 7 16.09 Fair CLR 25.7 19.2 67% 27 76.33 0.0 0.33
28 18:15 NE 7 16.09 Fair CLR 26.2 19.3 66% 27 76.33 0.0 0.18
28 17:55 N 7 16.09 Fair CLR 26.5 20 68% 28 76.3 0.0 0.43
28 17:35 N 7 16.09 Fair CLR 26.5 19.6 66% 28 76.33 0.0 0.33
28 17:15 N 13 16.09 Fair CLR 26.9 20 66% 28 76.3 0.0 0.18
28 16:55 N 11 16.09 A Few Clouds FEW055 27 20.4 67% 29 76.3 0.0 0.38 0.94
28 16:35 N 11 16.09 A Few Clouds FEW055 26.5 20.9 71% 28 76.3 0.0 0.3
28 16:15 Vrbl 9 16.09 Fair CLR 27 21 70% 29 76.3 0.0 0.18
28 15:55 NE 13 16.09 Mostly Cloudy SCT033 BKN045 26.3 21 73% 28 76.3 0.0 0.33
28 15:35 N 9 16.09 Partly Cloudy SCT032 27.4 21.6 71% 30 76.3 0.0 0.25
28 15:15 Calm 16.09 Partly Cloudy FEW035 SCT050 26.1 21.1 74% 28 76.33 0.0 0.13
28 14:55 Vrbl 11 16.09 Mostly Cloudy SCT029 BKN039 26.5 21.2 73% 28 76.3 0.0 0.23
28 14:35 N 13 16.09 Mostly Cloudy BKN029 BKN038 26 21.2 75% 27 76.33 0.0 0.15
28 14:15 N 13 16.09 A Few Clouds FEW026 26.7 21.7 74% 29 76.3 0.0 0.05
28 13:55 N 11 16.09 Partly Cloudy SCT024 26.3 21.7 26.3 19.5 76% 28 76.3 0.0 0.05 0.15
28 13:35 N 15 16.09 Partly Cloudy SCT024 26.2 22.1 78% 28 76.3 0.0 0.03
28 13:15 N 15 16.09 Partly Cloudy SCT022 26 22.1 79% 28 76.33 0.0 0.03
28 12:55 N 13 16.09 Partly Cloudy SCT019 SCT370 25.6 22.3 82% 27 76.33 0.0 0.03
28 12:35 N 11 16.09 Partly Cloudy SCT019 25.5 22.2 82% 27 76.33 0.0 0.03
28 12:15 NW 9 16.09 Partly Cloudy SCT019 25.2 22.1 83% 26 76.33 0.0 0.03
28 11:55 NE 9 16.09 Mostly Cloudy FEW016 BKN140 24.1 21.4 85% 24 76.33 0.0
28 11:35 N 7 16.09 Mostly Cloudy BKN140 23.5 21.2 87% 76.35 0.0
28 10:55 N 6 16.09 Mostly Cloudy SCT095 BKN140 BKN360 23 21.2 90% 76.35 0.0 0.03 0.08
28 10:35 N 6 16.09 Mostly Cloudy SCT100 BKN130 23 20.7 87% 76.33 0.0
28 10:15 Vrbl 6 16.09 Partly Cloudy FEW020 SCT130 22.5 21.1 92% 76.3 0.0
28 09:55 NE 6 16.09 Overcast OVC020 21.3 21.1 99% 76.3 0.0 0.03
28 09:35 NE 6 16.09 Overcast OVC019 20.7 20.7 100% 76.3 0.0 0.03
28 09:15 Calm 16.09 Overcast OVC018 20.5 20.5 100% 76.28 0.0
28 08:55 Calm 14.48 Overcast OVC016 20.1 20.1 100% 76.28 0.0 0.03
28 08:35 NE 6 14.48 Overcast OVC016 19.9 19.9 100% 76.25 0.0
28 08:15 NE 6 12.87 Overcast OVC017 19.6 19.6 100% 76.23 0.0
28 07:55 Calm 14.48 Overcast OVC016 19.2 19.2 19.2 18 100% 76.23 0.0 0.03
28 07:35 Calm 14.48 Overcast OVC016 19 19 100% 76.2 0.0
28 07:15 Calm 11.27 Overcast OVC016 18.6 18.6 100% 76.2 0.0
28 06:55 NE 6 12.87 Mostly Cloudy BKN017 18.4 18.4 100% 76.17 0.0
28 06:35 Calm 14.48 Partly Cloudy FEW016 SCT180 18.3 18.3 100% 76.17 0.0
28 06:15 Calm 12.87 Partly Cloudy SCT180 18.2 18.2 100% 76.15 0.0
28 05:55 N 6 6.44 Fog/Mist CLR 18 18 100% 76.12 0.0
28 05:35 Calm 11.27 Partly Cloudy SCT140 18.2 18.2 100% 76.12 0.0
28 05:15 Calm 9.66 Fog/Mist OVC140 18.2 18.2 100% 76.12 0.0
28 04:55 Calm 4.02 Fog/Mist FEW140 18 18 100% 76.12 0.0 0.03 0.03
28 04:35 Calm 6.44 Fog/Mist CLR 18.2 18.2 100% 76.12 0.0 0.03
28 04:15 Calm 11.27 Fair CLR 18.1 18.1 100% 76.1 0.0
28 03:55 Calm 14.48 A Few Clouds FEW140 18.2 18.2 100% 76.1 0.0
28 03:35 SE 7 14.48 A Few Clouds FEW140 18.2 18.2 100% 76.1 0.0
28 03:15 SE 7 12.87 NULL NULL 18.2 18.2 100% 76.1 0.0
28 02:55 Calm 8.05 Light Rain Fog/Mist NULL 18.5 18.5 100% 76.15 0.0
28 02:35 NW 7 12.87 Light Rain FEW080 SCT090 SCT210 18.3 18.3 100% 76.17 0.0
28 02:15 Calm 14.48 A Few Clouds FEW220 18.3 18.3 100% 76.15 0.0
28 01:55 S 6 12.87 Light Rain FEW100 18.4 18.4 20.7 18.1 100% 76.17 0.0 0.03 0.05
28 01:35 SE 6 16.09 Partly Cloudy FEW080 SCT130 18.4 18.4 100% 76.17 0.0 0.03
28 01:15 Calm 16.09 A Few Clouds FEW120 18.3 18.2 99% 76.17 0.0
28 00:55 NW 6 16.09 A Few Clouds FEW160 18.8 18.8 100% 76.17 0.0
28 00:35 N 6 16.09 A Few Clouds FEW120 18.8 18.8 100% 76.2 0.0
28 00:15 N 13 12.87 Light Rain FEW010 SCT022 SCT034 BKN120 19.1 19 99% 76.2 0.0
27 23:55 NW 20 16.09 Mostly Cloudy BKN020 19.6 19.2 98% 76.28 0.0
27 23:35 N 22 G 43 16.09 A Few Clouds FEW017 19.7 19.6 99% 76.25 0.0
27 23:15 N 13 16.09 Partly Cloudy FEW020 SCT140 20.2 20.2 100% 76.2 0.0
27 22:55 NW 11 14.48 Light Rain Thunderstorm in Vicinity FEW020 BKN085 BKN120 BKN140 20.6 20.6 100% 76.17 0.0 0.03 0.03
27 22:35 NW 11 14.48 Light Rain Thunderstorm in Vicinity BKN090 OVC120 20.2 20.2 100% 76.17 0.0 0.03
27 22:15 Calm 14.48 Thunderstorm in Vicinity SCT100 BKN120 19.8 19.8 100% 76.15 0.0 0.03
27 21:55 NW 9 14.48 Partly Cloudy FEW080 SCT110 19.8 19.8 100% 76.15 0.0
27 21:35 N 9 14.48 Thunderstorm in Vicinity SCT075 SCT100 19.9 19.9 100% 76.17 0.0
27 21:15 SE 7 14.48 Partly Cloudy FEW100 SCT130 19.8 19.8 100% 76.15 0.0
27 20:55 SE 13 12.87 Light Rain FEW130 19.8 19.8 100% 76.12 0.0
27 20:35 SE 9 16.09 Thunderstorm in Vicinity FEW130 20 20 100% 76.12 0.0
27 20:15 SE 11 16.09 Mostly Cloudy FEW032 SCT049 BKN130 20.1 20.1 100% 76.17 0.0
27 19:35 E 11 12.87 NULL NULL 20.5 20.5 100% 76.15 0.0 0.03
27 19:15 SE 11 14.48 Mostly Cloudy SCT006 BKN060 BKN075 20.9 20.9 100% 76.15 0.0 0.03
27 18:55 SE 11 14.48 Overcast FEW013 BKN060 OVC075 21.2 21.2 100% 76.12 0.0
27 18:15 SE 9 12.87 Light Rain Thunderstorm in Vicinity NULL 21.3 21.3 100% 76.15 0.0
27 17:55 E 9 G 50 0.40 Thunderstorm Heavy Rain Fog NULL 21.5 21 97% 76.12 0.0
27 17:35 SW 6 1.21 Rain Fog/Mist Thunderstorm in Vicinity NULL 20.7 20.7 100% 76.17 0.0
27 17:15 Vrbl 6 3.22 Rain Fog/Mist Thunderstorm in Vicinity NULL 20.8 20.8 100% 76.12 0.0
27 16:55 E 13 2.01 Light Rain Fog/Mist Thunderstorm in Vicinity NULL 21.1 21.1 100% 76.17 0.0 0.03
27 16:35 W 11 8.05 Light Rain Fog/Mist Thunderstorm in Vicinity NULL 21.7 21.7 100% 76.2 0.0
27 16:15 SE 13 8.05 Light Rain Fog/Mist Thunderstorm in Vicinity BKN011 OVC025 22.3 22.2 99% 76.1 0.0
27 15:55 Vrbl 6 14.48 Overcast SCT011 SCT019 BKN023 OVC031 23.2 22.9 98% 76.12 0.0
27 15:35 SE 19 16.09 Overcast FEW015 BKN023 BKN028 OVC035 24.3 23.5 95% 24 76.12 0.0
27 15:15 S 9 16.09 Overcast SCT022 BKN029 OVC039 26.6 24.1 86% 29 76.12 0.0
27 14:55 Vrbl 6 16.09 Mostly Cloudy SCT019 BKN027 BKN034 BKN043 27 24.7 87% 30 76.15 0.0 0.03
27 14:35 Vrbl 11 16.09 Mostly Cloudy SCT020 BKN027 BKN033 26.8 24.3 86% 30 76.12 0.0 0.03
27 14:15 Vrbl 11 16.09 Mostly Cloudy BKN019 BKN026 26.9 24.2 85% 30 76.15 0.0
27 13:55 Vrbl 9 16.09 Thunderstorm in Vicinity BKN017 BKN028 26.8 24.2 27 20.8 86% 30 76.15 0.0 0.03
27 13:35 Vrbl 7 14.48 Thunderstorm in Vicinity BKN018 26.2 24.1 88% 28 76.15 0.0
27 13:15 W 9 16.09 Partly Cloudy FEW014 SCT065 SCT080 25.6 23.9 90% 27 76.15 0.0
27 12:55 S 7 16.09 Mostly Cloudy SCT046 BKN070 24.5 22.9 91% 25 76.17 0.0
27 12:35 Calm 16.09 Mostly Cloudy BKN044 23.3 21.6 90% 76.2 0.0
27 12:15 Calm 16.09 Overcast OVC044 22.8 21.2 91% 76.23 0.0
27 11:55 Calm 16.09 Thunderstorm in Vicinity FEW006 BKN045 BKN060 22.9 22.6 98% 76.23 0.0 0.03
27 11:35 Calm 14.48 Thunderstorm in Vicinity FEW006 SCT050 BKN065 22.8 22.8 100% 76.23 0.0 0.03
27 11:15 Vrbl 9 12.87 Thunderstorm in Vicinity SCT048 BKN090 22.4 22.4 100% 76.25 0.0 0.03
27 10:55 Vrbl 6 11.27 Thunderstorm in Vicinity NULL 22.5 22.5 100% 76.23 0.0
27 10:35 Calm 3.22 Light Rain Fog/Mist Thunderstorm in Vicinity NULL 22.7 22.7 100% 76.25 0.0
27 10:15 Vrbl 6 14.48 Overcast OVC011 23.2 22.7 97% 76.25 0.0
27 09:55 S 7 14.48 Overcast OVC010 23 22.5 97% 76.23 0.0
27 09:35 Vrbl 6 16.09 Overcast OVC010 22.8 22.3 97% 76.23 0.0
27 09:15 Calm 14.48 Overcast OVC010 22.2 21.7 97% 76.25 0.0
27 08:55 Vrbl 6 14.48 Overcast OVC010 21.8 21.3 97% 76.25 0.0
27 08:35 Vrbl 7 16.09 Overcast OVC012 21.7 21 96% 76.25 0.0
27 08:15 S 7 11.27 Rain OVC014 21.1 20.6 97% 76.25 0.0
27 07:55 SE 7 16.09 Partly Cloudy SCT016 20.8 20.3 20.8 19.9 97% 76.23 0.0
27 07:35 Vrbl 6 14.48 Partly Cloudy FEW016 SCT120 SCT150 20.7 20.2 97% 76.23 0.0
27 07:15 S 6 14.48 A Few Clouds FEW140 20.5 19.8 96% 76.23 0.0
27 06:55 Vrbl 6 16.09 Mostly Cloudy BKN110 20.2 19.6 96% 76.23 0.0
27 06:35 Vrbl 6 16.09 Overcast OVC110 20.2 19.5 96% 76.23 0.0
27 06:15 Vrbl 7 16.09 Overcast FEW080 OVC110 20.1 19.3 95% 76.23 0.0
27 05:55 Vrbl 7 16.09 Partly Cloudy FEW070 SCT120 19.9 19.2 96% 76.23 0.0
27 05:35 Vrbl 6 16.09 Mostly Cloudy SCT075 BKN120 20 19.2 95% 76.23 0.0
27 05:15 Vrbl 6 16.09 Overcast BKN075 OVC120 20.2 19.2 94% 76.23 0.0
27 04:55 Vrbl 7 16.09 Overcast FEW075 OVC110 20.1 19.3 95% 76.23 0.0
27 04:35 Vrbl 6 16.09 Overcast OVC110 20.2 19.2 94% 76.23 0.0
27 04:15 Vrbl 6 16.09 Mostly Cloudy BKN110 20.1 19.2 95% 76.23 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)