National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Weather observations for the past three days for
Richard I. Bong Airport
Metric (Imperial)
Date Time (cdt) 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.
15 07:55 Calm 11.27 Overcast OVC011 3.2 3 99% 75.72 0.0
15 07:35 Calm 8.05 Fog/Mist OVC013 3 2.8 99% 75.72 0.0
15 07:15 Calm 8.05 Fog/Mist OVC013 2.9 2.6 98% 75.74 0.0
15 06:55 W 6 8.05 Fog/Mist SCT003 OVC015 2.7 2.5 2.7 2.2 99% 75.72 0.0
15 06:35 Calm 8.05 Fog/Mist SCT003 OVC013 2.6 2.5 99% 75.72 0.0
15 06:15 S 7 8.05 Fog/Mist SCT003 OVC013 2.6 2.5 99% 1 75.72 0.0
15 05:55 Calm 6.44 Fog/Mist OVC013 2.6 2.5 99% 75.72 0.0
15 05:35 Calm 4.83 Fog/Mist OVC013 2.7 2.5 99% 75.67 0.0
15 05:15 Calm 6.44 Fog/Mist OVC013 2.7 2.5 99% 75.67 0.0
15 04:55 Calm 4.83 Fog/Mist OVC013 2.6 2.5 99% 75.67 0.0
15 04:35 Calm 6.44 Fog/Mist OVC013 2.7 2.5 99% 75.69 0.0
15 04:15 Calm 6.44 Fog/Mist OVC013 2.6 2.3 98% 75.69 0.0
15 03:55 SW 6 4.02 Fog/Mist SCT003 SCT009 OVC013 2.5 2.2 98% 75.67 0.0
15 03:35 SW 6 4.02 Fog/Mist SCT003 BKN009 OVC013 2.5 2.2 98% 75.69 0.0
15 03:15 S 7 1.61 Fog/Mist BKN003 OVC013 2.5 2.3 99% 1 75.67 0.0
15 02:55 Calm 2.01 Fog/Mist OVC013 2.6 2.4 99% 75.64 0.0
15 02:35 Calm 1.21 Fog/Mist BKN002 OVC013 2.7 2.5 99% 75.62 0.0
15 02:15 Calm 1.21 Fog/Mist BKN004 BKN007 OVC013 2.6 2.5 99% 75.62 0.0
15 01:55 NW 6 1.21 Fog/Mist OVC004 2.5 2.2 98% 75.64 0.0
15 01:35 NW 6 0.80 Fog OVC004 2.2 2 99% 75.67 0.0
15 01:15 Calm 1.21 Fog/Mist OVC004 2.2 2 99% 75.69 0.0
15 00:55 Calm 1.21 Fog/Mist OVC002 2.2 2 2.5 1.8 99% 75.69 0.0
15 00:35 Calm 1.61 Fog/Mist OVC002 2.1 1.8 98% 75.72 0.0
15 00:15 N 6 2.41 Fog/Mist OVC002 2 1.7 98% 75.69 0.0
14 23:55 N 6 1.61 Fog/Mist OVC002 2 1.7 98% 75.67 0.0
14 23:35 N 6 3.22 Fog/Mist OVC002 2.1 1.8 98% 75.67 0.0
14 23:15 NW 6 2.01 Fog/Mist OVC002 1.9 1.6 98% 75.69 0.0
14 22:55 N 7 1.21 Fog/Mist OVC002 1.8 1.5 98% -0 75.67 0.0
14 22:35 Calm 0.80 Fog OVC002 1.8 1.5 98% 75.69 0.0
14 22:15 Calm 1.21 Fog/Mist OVC002 1.8 1.5 98% 75.72 0.0
14 21:55 Calm 1.21 Fog/Mist OVC002 2 1.6 97% 75.67 0.0
14 21:35 Calm 0.80 Fog OVC002 1.8 1.5 98% 75.67 0.0
14 21:15 Calm 1.21 Fog/Mist OVC002 1.8 1.5 98% 75.64 0.0
14 20:55 E 7 1.61 Fog/Mist OVC002 2 1.6 97% 0 75.62 0.0
14 20:35 NE 6 1.21 Fog/Mist OVC002 1.9 1.4 97% 75.59 0.0
14 20:15 N 6 0.80 Fog OVC002 1.9 1.4 97% 75.59 0.0
14 19:55 Calm 0.80 Fog OVC002 2 1.3 95% 75.62 0.0
14 19:35 N 9 8.05 Fog/Mist BKN002 OVC005 2.2 1.6 96% -0 75.62 0.0
14 19:15 NE 6 16.09 Overcast OVC005 2.4 1.7 95% 75.64 0.0
14 18:55 NE 6 8.05 Fog/Mist OVC004 2.4 1.7 3.2 2.4 95% 75.67 0.0
14 18:35 N 6 11.27 Overcast OVC004 2.5 1.7 95% 75.67 0.0
14 18:15 NE 6 16.09 Overcast OVC004 2.8 2 95% 75.67 0.0
14 17:55 Calm 11.27 Overcast OVC004 2.7 2 95% 75.67 0.0
14 17:35 NE 6 4.83 Fog/Mist OVC004 3 2.1 94% 75.64 0.0
14 17:15 NE 6 4.83 Fog/Mist OVC004 3.1 2.3 95% 75.64 0.0
14 16:55 NE 6 4.02 Fog/Mist OVC002 3.1 2.5 96% 75.64 0.0
14 16:35 NE 6 4.83 Fog/Mist OVC002 2.9 2.2 95% 75.64 0.0
14 16:20 NE 6 4.02 Fog/Mist OVC002 3 2.3 95% 75.64 0.0
14 15:55 NE 7 8.05 Fog/Mist OVC002 2.7 2.2 97% 1 75.62 0.0
14 15:35 NE 9 3.22 Fog/Mist OVC002 2.7 2.2 97% 0 75.64 0.0
14 15:15 NE 11 2.41 Fog/Mist OVC002 2.7 2.3 97% 0 75.62 0.0
14 14:55 NE 11 2.01 Fog/Mist OVC002 2.6 2.2 97% -0 75.62 0.0
14 14:35 NE 15 2.01 Fog/Mist OVC002 2.8 2.4 97% -1 75.64 0.0
14 14:15 NE 13 2.82 Fog/Mist OVC002 2.8 2.4 97% -0 75.64 0.0
14 13:55 NE 9 4.02 Fog/Mist OVC002 3 2.6 97% 1 75.62 0.0
14 13:35 NE 11 3.22 Fog/Mist OVC002 2.8 2.5 98% 0 75.62 0.0
14 13:15 E 17 G 26 1.61 Fog/Mist OVC002 2.7 2.4 98% -1 75.62 0.0
14 12:55 NE 11 2.41 Fog/Mist OVC002 2.3 2 2.4 1.6 98% -0 75.67 0.0
14 12:35 NE 13 4.02 Fog/Mist OVC002 2.2 2 99% -1 75.67 0.0
14 12:15 NE 15 4.83 Fog/Mist OVC002 2.1 1.8 98% -1 75.67 0.0
14 11:55 NE 15 3.22 Fog/Mist OVC002 2.2 2 99% -1 75.67 0.0
14 11:35 NE 15 2.41 Fog/Mist OVC002 2.4 2.1 98% -1 75.67 0.0
14 11:15 NE 15 2.82 Fog/Mist OVC002 2.2 1.9 98% -1 75.64 0.0
14 10:55 NE 15 2.41 Fog/Mist OVC002 2 1.7 98% -2 75.64 0.0
14 10:35 NE 13 G 26 2.82 Fog/Mist OVC002 2 1.7 98% -1 75.67 0.0
14 10:15 NE 13 2.41 Fog/Mist OVC002 1.9 1.5 97% -1 75.67 0.0
14 09:55 NE 15 G 28 2.01 Fog/Mist OVC002 1.6 1.3 98% -2 75.62 0.0
14 09:35 NE 19 G 28 1.61 Fog/Mist OVC002 1.7 1.4 98% -2 75.62 0.0
14 09:15 NE 19 2.01 Fog/Mist OVC002 1.7 1.5 99% -2 75.64 0.0
14 08:55 NE 17 G 28 1.61 Fog/Mist OVC002 1.7 1.5 99% -2 75.67 0.0
14 08:35 NE 15 1.21 Fog/Mist OVC002 1.8 1.5 98% -2 75.67 0.0
14 08:15 NE 19 0.80 Fog OVC002 1.7 1.4 98% -2 75.64 0.0
14 07:55 NE 13 0.80 Fog OVC002 1.6 1.3 98% -2 75.67 0.0
14 07:35 NE 17 G 28 0.80 Fog OVC002 1.7 1.3 97% -2 75.64 0.0
14 07:15 NE 17 0.80 Fog OVC002 1.8 1.5 98% -2 75.62 0.0
14 06:55 NE 17 G 28 1.61 Fog/Mist OVC002 2.1 1.7 3 1.8 97% -2 75.62 0.0
14 06:35 E 17 G 26 3.22 Fog/Mist OVC002 2.3 2 98% -1 75.64 0.0
14 06:15 NE 17 G 28 2.41 Fog/Mist OVC002 2.5 2.1 97% -1 75.64 0.0
14 05:55 NE 15 2.82 Light Drizzle OVC002 2.6 2.2 97% -1 75.62 0.0
14 05:35 NE 11 3.22 Fog/Mist OVC002 2.5 2 97% -0 75.69 0.0
14 05:15 N 7 3.22 Fog/Mist OVC002 2.1 1.6 97% 0 75.77 0.0
14 04:55 NE 11 4.02 Fog/Mist OVC002 2.5 1.8 95% -0 75.74 0.0
14 04:35 NE 15 4.02 Fog/Mist OVC004 2.2 1.5 95% -1 75.67 0.0
14 04:15 NE 17 G 26 8.05 Fog/Mist OVC004 2 1.2 95% -2 75.64 0.0
14 03:55 NE 15 11.27 Overcast OVC004 2.1 1.4 95% -1 75.64 0.0
14 03:35 E 13 16.09 Overcast OVC004 2.3 1.5 95% -1 75.64 0.0
14 03:15 E 19 G 30 16.09 Overcast OVC006 2.6 2 96% -1 75.62 0.0
14 02:55 E 19 16.09 Overcast OVC006 2.8 2.2 96% -1 75.67 0.0
14 02:35 NE 17 16.09 Overcast OVC006 2.8 2.3 97% -1 75.67 0.0
14 02:15 NE 13 G 31 16.09 Overcast OVC004 3 2.5 97% 0 75.67 0.0
14 01:55 NE 19 G 28 16.09 Overcast OVC002 2.6 2.2 97% -1 75.67 0.0
14 01:35 NE 11 3.22 Fog/Mist OVC002 2 1.6 97% -1 75.69 0.0
14 01:15 NE 7 1.21 Fog/Mist OVC002 1.8 1.3 97% -0 75.69 0.0
14 00:55 NE 11 1.21 Fog/Mist OVC002 2 1.5 5.8 1.9 97% -1 75.67 0.0
14 00:35 NE 13 1.21 Fog/Mist OVC002 2 1.5 97% -1 75.67 0.0
14 00:15 NE 13 6.44 Fog/Mist OVC002 2.2 1.5 95% -1 75.69 0.0
13 23:55 NE 11 16.09 Overcast OVC004 2.5 1.6 94% -0 75.72 0.0
13 23:35 NE 11 16.09 Overcast OVC004 2.5 1.6 94% -0 75.69 0.0
13 23:15 NE 13 16.09 Mostly Cloudy BKN004 BKN120 3 1.6 91% 0 75.72 0.0
13 22:55 E 15 G 28 16.09 Fair CLR 3.5 2.2 91% 0 75.72 0.0
13 22:35 NE 15 G 26 16.09 Fair CLR 3.4 1.8 89% 0 75.69 0.0
13 22:15 NE 17 16.09 Fair CLR 4.4 2.2 86% 1 75.72 0.0
13 21:55 E 19 16.09 Fair CLR 5.5 2.6 82% 2 75.72 0.0
13 21:35 NE 13 16.09 Fair CLR 5.7 2.7 81% 3 75.69 0.0
13 21:15 NE 7 16.09 Fair CLR 4.9 2.5 85% 3 75.72 0.0
13 20:55 NE 11 16.09 Partly Cloudy SCT120 4.6 2.3 85% 2 75.72 0.0
13 20:35 E 13 16.09 Partly Cloudy SCT120 4.5 2.3 86% 2 75.72 0.0
13 20:15 NE 17 16.09 Partly Cloudy SCT120 4.4 2.2 86% 1 75.67 0.0
13 19:55 NE 9 16.09 Fair CLR 4.8 2.7 86% 3 75.67 0.0
13 19:35 NE 7 16.09 Partly Cloudy SCT120 4.5 2.6 88% 3 75.69 0.0
13 19:15 N 15 16.09 Partly Cloudy SCT120 4.4 2.2 86% 1 75.69 0.0
13 18:55 NE 15 16.09 Partly Cloudy SCT120 6 2.9 10.8 6 81% 3 75.74 0.0
13 18:35 E 11 16.09 Partly Cloudy SCT049 6.5 3.5 81% 5 75.77 0.0
13 18:15 E 11 16.09 Partly Cloudy SCT024 SCT049 6.3 3.4 82% 4 75.79 0.0
13 17:55 E 7 16.09 Mostly Cloudy BKN024 7.5 3.5 76% 6 75.82 0.0
13 17:35 NE 11 16.09 Mostly Cloudy BKN022 7.7 3.5 75% 6 75.79 0.0
13 17:15 E 13 16.09 Overcast OVC022 8.7 3.7 71% 7 75.77 0.0
13 16:55 NE 11 16.09 Overcast OVC022 9.4 4.3 71% 8 75.77 0.0
13 16:35 NE 13 16.09 Overcast OVC022 9.7 4.5 70% 8 75.77 0.0
13 16:15 NE 11 16.09 Overcast OVC022 9.8 4.4 69% 8 75.77 0.0
13 15:55 NE 17 16.09 Overcast OVC022 9.9 4.4 69% 8 75.79 0.0
13 15:35 NE 15 16.09 Overcast OVC020 9.4 4.5 72% 7 75.82 0.0
13 15:15 NE 11 16.09 Overcast OVC020 9.1 4.6 74% 8 75.84 0.0
13 14:55 NE 11 16.09 Overcast OVC020 8.8 4.4 74% 7 75.84 0.0
13 14:35 NE 13 16.09 Overcast OVC020 9.1 4.4 73% 7 75.87 0.0
13 14:15 NE 13 16.09 Overcast OVC020 9.2 4.5 73% 7 75.87 0.0
13 13:55 NE 13 16.09 Overcast OVC020 9.7 4.6 71% 8 75.87 0.0
13 13:35 NE 11 16.09 Overcast OVC020 10.3 5 70% 75.87 0.0
13 13:15 NE 11 16.09 Overcast OVC020 10.4 5.3 71% 75.9 0.0
13 12:55 NE 9 16.09 Overcast OVC020 10.1 4.8 10.5 7.6 70% 75.87 0.0
13 12:35 NE 15 16.09 Overcast OVC020 10.4 5.1 70% 75.87 0.0
13 12:15 N 13 16.09 Overcast OVC020 10.1 4.8 70% 75.87 0.0
13 11:55 NE 13 16.09 Overcast OVC020 10.2 4.9 70% 75.87 0.0
13 11:35 NE 9 16.09 Overcast OVC020 10.2 5.1 71% 75.87 0.0
13 11:15 N 11 16.09 Overcast OVC020 9.9 5.2 73% 9 75.87 0.0
13 10:55 N 13 16.09 Overcast OVC020 9.9 5.4 74% 8 75.84 0.0
13 10:35 N 11 16.09 Overcast OVC020 10.1 5.4 73% 75.84 0.0
13 10:15 N 7 16.09 Overcast OVC018 9.9 5.9 76% 9 75.84 0.0
13 09:55 NW 7 16.09 Overcast OVC018 9.5 5.9 78% 9 75.84 0.0
13 09:35 NW 11 16.09 Overcast OVC018 9.1 6 81% 8 75.84 0.0
13 09:15 NW 11 16.09 Overcast OVC018 8.8 6 83% 7 75.84 0.0
13 08:55 NW 9 16.09 Overcast OVC018 8.5 6 84% 7 75.84 0.0
13 08:35 NW 9 16.09 Overcast OVC018 8.3 5.8 84% 7 75.79 0.0
13 08:15 NW 7 16.09 Overcast OVC016 8 5.8 86% 7 75.79 0.0
13 07:55 NW 7 16.09 Overcast OVC016 7.8 5.8 87% 7 75.77 0.0
13 07:35 N 9 16.09 Overcast OVC016 7.7 5.8 88% 6 75.72 0.0
13 07:15 NW 7 16.09 Overcast OVC016 7.6 5.8 89% 7 75.69 0.0
13 06:55 N 7 16.09 Overcast OVC018 7.6 5.8 10.5 7.1 89% 7 75.67 0.0
13 06:35 N 6 16.09 Overcast OVC018 7.7 5.8 88% 75.64 0.0
13 06:15 NW 11 16.09 Overcast OVC018 8.2 6.2 87% 7 75.62 0.0
13 05:55 N 6 16.09 Overcast OVC018 8.5 6.5 87% 75.59 0.0
13 05:35 NW 7 16.09 Overcast OVC016 8.8 6.6 86% 8 75.59 0.0
13 05:15 NW 9 16.09 Overcast OVC016 9 6.8 86% 8 75.57 0.0
13 04:55 NW 11 16.09 Overcast OVC016 9 7 87% 8 75.54 0.0
13 04:35 NW 6 16.09 Overcast OVC016 9.5 7.3 86% 75.54 0.0
13 04:15 N 6 16.09 Overcast OVC016 9.8 7.6 86% 75.49 0.0
13 03:55 NW 9 16.09 Overcast OVC016 10 7.7 86% 9 75.49 0.0
13 03:35 NW 17 16.09 Overcast OVC016 10.1 8.1 88% 75.46 0.0
13 03:15 NW 17 16.09 Overcast OVC016 10.5 8.5 88% 75.41 0.0
13 02:55 NW 7 16.09 Overcast OVC016 10.4 9 91% 75.41 0.0
13 02:35 NW 6 16.09 Overcast OVC014 10.5 9.5 94% 75.39 0.0
13 02:15 N 11 16.09 Overcast OVC014 10.5 10 97% 75.36 0.0
13 01:55 NW 11 16.09 Overcast OVC014 10.4 10.1 98% 75.34 0.0
13 01:35 Calm 16.09 Overcast OVC016 8.3 8 98% 75.31 0.0
13 01:15 Calm 16.09 Overcast OVC016 8.5 8.3 99% 75.23 0.0
13 00:55 SW 6 16.09 Mostly Cloudy BKN018 7 6.8 7 2.9 99% 75.21 0.0
13 00:35 S 11 11.27 Fair CLR 6 5.8 99% 4 75.16 0.0
13 00:15 S 11 11.27 Fair CLR 5.2 5.1 99% 3 75.11 0.0
12 23:55 S 13 8.05 Fog/Mist CLR 4.3 4.1 99% 2 75.08 0.0
12 23:35 S 11 6.44 Fog/Mist CLR 3.7 3.5 99% 1 75.06 0.0
12 23:15 S 9 4.83 Fog/Mist CLR 3.2 3 99% 1 75.03 0.0
12 22:55 S 6 6.44 Fog/Mist CLR 3.4 3.1 98% 75.03 0.0
12 22:35 S 6 8.05 Fog/Mist CLR 3.3 3 98% 75.01 0.0
12 22:15 S 6 8.05 Fog/Mist CLR 3.5 3.1 97% 75.01 0.0
12 21:55 SW 7 6.44 Fog/Mist SCT001 3.4 3.1 98% 2 74.98 0.0
12 21:35 S 7 4.83 Fog/Mist OVC001 3.5 3.2 98% 2 74.98 0.0
12 21:15 S 6 1.61 Fog/Mist OVC001 3.2 3 99% 74.96 0.0
12 20:55 Calm 0.80 Fog OVC003 3.5 3.1 97% 74.9 0.0
12 20:35 W 6 1.21 Fog/Mist OVC003 3.9 3.5 97% 74.9 0.0
12 20:15 Calm 1.21 Fog/Mist OVC003 3.8 3.5 98% 74.85 0.0
12 19:55 SE 7 0.80 Fog OVC003 4 3.5 97% 2 74.83 0.0
12 19:35 Calm 0.40 Fog OVC003 3.9 3.5 97% 74.78 0.0
12 19:15 Calm 0.24 Fog OVC003 4 3.6 97% 74.78 0.0
12 18:55 N 6 0.24 Fog OVC003 4 3.6 5.9 2.6 97% 74.78 0.0
12 18:35 N 7 0.40 Fog OVC003 3.7 3.2 97% 2 74.75 0.0
12 18:15 Calm 0.40 Fog OVC003 3.8 3.2 96% 74.73 0.0
12 17:55 N 7 1.61 Fog/Mist OVC003 4.5 4 97% 3 74.73 0.0
12 17:35 E 9 1.21 Fog/Mist OVC003 5.1 4.6 97% 3 74.73 0.0
12 17:15 E 9 3.22 Fog/Mist OVC003 5.5 5.1 97% 4 74.75 0.0
12 16:55 NE 9 2.41 Fog/Mist OVC003 5.6 5.3 98% 4 74.75 0.0
12 16:35 E 11 1.61 Fog/Mist OVC003 5.7 5.5 99% 4 74.75 0.0
12 16:15 NE 11 0.80 Fog OVC003 5.5 5.2 98% 3 74.75 0.0
12 15:55 E 9 1.21 Fog/Mist OVC003 5.2 5 99% 3 74.75 0.0
12 15:35 E 11 0.80 Fog OVC003 4.5 4.2 98% 2 74.75 0.0
12 15:15 NE 13 0.80 Fog OVC003 3.9 3.6 98% 1 74.8 0.0
12 14:55 N 11 0.80 Fog OVC003 4.5 4.3 99% 2 74.83 0.0
12 14:35 N 11 0.40 Fog OVC003 3.7 3.5 99% 1 74.83 0.0
12 14:15 N 7 0.40 Fog OVC003 3.6 3.4 99% 2 74.85 0.0
12 13:55 NE 11 0.40 Fog OVC003 2.9 2.6 98% 0 74.85 0.0
12 13:35 NE 7 0.40 Fog OVC003 3.1 2.8 98% 1 74.9 0.0
12 13:15 E 9 0.40 Fog OVC003 2.9 2.7 99% 1 74.93 0.0
12 12:55 E 9 0.80 Fog OVC003 2.6 2.4 2.9 1.5 99% 0 74.96 0.0 0.05 0.1
12 12:35 NE 11 2.01 Light Rain OVC003 2.4 2.1 98% -0 75.03 0.0 0.05
12 12:15 NE 6 1.21 Fog/Mist OVC003 2.2 2 99% 75.08 0.0
12 11:55 NE 7 2.01 Fog/Mist OVC003 2.1 1.8 98% 0 75.11 0.0
12 11:35 NE 11 2.01 Fog/Mist OVC003 2.3 2 98% -0 75.13 0.0
12 11:15 NE 11 1.61 Fog/Mist OVC003 2.2 2 99% -1 75.16 0.0
12 10:55 NE 11 2.01 Fog/Mist OVC003 2 1.8 99% -1 75.16 0.0
12 10:35 NE 13 2.01 Fog/Mist OVC003 2 1.7 98% -1 75.18 0.0
12 10:15 NE 11 2.01 Fog/Mist OVC003 2.1 1.8 98% -1 75.21 0.0
12 09:55 NE 13 1.61 Fog/Mist OVC003 2.1 1.8 98% -1 75.23 0.0 0.05
12 09:35 NE 15 1.61 Fog/Mist OVC003 2.1 1.8 98% -1 75.26 0.0
12 09:15 NE 11 1.21 Fog/Mist OVC003 2 1.7 98% -1 75.31 0.0
12 08:55 NE 15 1.61 Light Drizzle OVC003 1.8 1.5 98% -2 75.31 0.0 0.03
12 08:35 NE 9 1.21 Light Drizzle OVC003 1.7 1.5 99% -1 75.34 0.0
12 08:15 NE 11 1.61 Light Drizzle OVC003 1.8 1.5 98% -1 75.34 0.0
Date Time (cdt) 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)