Weather observations for the past three days for
St Marys 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.
25 11:55 S 7 0.00 Partly Cloudy FEW260 SCT370 26.7 15 49% 27 76.48 0.0
25 11:35 S 9 0.00 Partly Cloudy SCT260 SCT370 27 15.3 49% 27 76.45 0.0
25 11:15 Vrbl 11 0.00 Partly Cloudy SCT250 26.4 17 56% 27 76.43 0.0
25 10:55 S 7 0.00 Mostly Cloudy BKN250 25.8 17.3 59% 27 76.45 0.0
25 10:35 Calm 0.00 Mostly Cloudy BKN260 24.9 18.3 67% 26 76.43 0.0
25 10:15 Calm 0.00 Partly Cloudy SCT270 SCT370 24.9 19.4 72% 26 76.43 0.0
25 09:55 SW 9 0.00 A Few Clouds FEW280 24.8 19.3 72% 26 76.43 0.0
25 09:35 SW 9 0.00 A Few Clouds FEW340 24.6 19.3 72% 25 76.43 0.0
25 09:15 Vrbl 6 0.00 A Few Clouds FEW350 24.1 19.2 74% 25 76.4 0.0
25 08:55 SW 7 0.00 Fair CLR 23.2 19.9 82% 76.4 0.0
25 08:35 SW 9 0.00 Fair CLR 22.2 19.5 85% 76.4 0.0
25 08:15 SW 7 0.00 Fair CLR 21.9 19.4 86% 76.4 0.0
25 07:55 Calm 0.00 Fair CLR 21 19.2 21 17.5 90% 76.4 0.0
25 07:35 SW 6 0.00 Fair CLR 20.8 19.1 90% 76.4 0.0
25 07:15 SW 6 0.00 Fair CLR 20.2 18.8 92% 76.4 0.0
25 06:55 Calm 0.00 Fair CLR 18.9 18.1 95% 76.4 0.0
25 06:35 Calm 0.00 Fair CLR 18.4 17.5 95% 76.38 0.0
25 06:15 Calm 0.00 Fair CLR 17.9 17.4 97% 76.38 0.0
25 05:55 Calm 0.00 Fair CLR 17.5 17.2 98% 76.35 0.0
25 05:35 Calm 0.00 Fair CLR 17.9 17.3 96% 76.33 0.0
25 05:15 Calm 0.00 Fair CLR 17.8 17.1 96% 76.33 0.0
25 04:55 Calm 0.00 Fair CLR 17.8 17 95% 76.33 0.0
25 04:35 Calm 0.00 Fair CLR 18 17 94% 76.33 0.0
25 04:15 Calm 0.00 Fair CLR 17.8 16.8 94% 76.33 0.0
25 03:35 Calm 0.00 Fair CLR 18 16.6 92% 76.33 0.0
25 03:15 Calm 0.00 Fair CLR 18.1 16.5 90% 76.33 0.0
25 02:55 Calm 0.00 Fair CLR 18.1 16.2 89% 76.35 0.0
25 02:35 Calm 0.00 Fair CLR 18.2 16.2 88% 76.35 0.0
25 02:15 S 7 0.00 Fair CLR 18.8 16.2 85% 76.35 0.0
25 01:55 Calm 0.00 Fair CLR 18.1 16.1 25.4 17.9 88% 76.35 0.0
25 01:35 Calm 0.00 Fair CLR 18 16 88% 76.35 0.0
25 01:15 Calm 0.00 Fair CLR 18.6 16.1 85% 76.35 0.0
25 00:55 Calm 0.00 Fair CLR 18.5 16.2 87% 76.35 0.0
25 00:35 Calm 0.00 Fair CLR 18.1 16.2 89% 76.35 0.0
25 00:15 Calm 0.00 Fair CLR 18.8 16.3 86% 76.35 0.0
24 23:55 Calm 0.00 Fair CLR 18.8 16.3 86% 76.35 0.0
24 23:35 Calm 0.00 Fair CLR 18.9 16.3 85% 76.35 0.0
24 23:15 Calm 0.00 Fair CLR 19.1 16.2 83% 76.35 0.0
24 22:55 Calm 0.00 Fair CLR 19.6 16.1 80% 76.35 0.0
24 22:35 Calm 0.00 Fair CLR 19.5 15.9 80% 76.35 0.0
24 22:15 Calm 0.00 Fair CLR 19.5 15.8 79% 76.35 0.0
24 21:55 Calm 0.00 Fair CLR 20.1 15.5 75% 76.35 0.0
24 21:35 Calm 0.00 Fair CLR 20.5 15.7 74% 76.33 0.0
24 21:15 Calm 0.00 Fair CLR 20.9 15.3 70% 76.3 0.0
24 20:55 Calm 0.00 Fair CLR 22.6 14.7 61% 76.28 0.0
24 20:35 Calm 0.00 Fair CLR 23.7 14.3 56% 76.28 0.0
24 20:15 S 6 0.00 Fair CLR 24.5 14 52% 26 76.28 0.0
24 19:55 S 6 0.00 Fair CLR 25.6 13.4 28.4 25.6 47% 26 76.28 0.0
24 19:35 SW 9 0.00 Fair CLR 26.3 13.2 44% 27 76.28 0.0
24 19:15 SW 11 0.00 Fair CLR 26.6 12.5 42% 27 76.28 0.0
24 18:55 SW 13 0.00 Fair CLR 27 12.4 40% 27 76.28 0.0
24 18:35 SW 13 0.00 Fair CLR 27.2 12.2 39% 27 76.28 0.0
24 18:15 SW 9 0.00 Fair CLR 27.3 12.5 40% 27 76.25 0.0
24 17:55 SW 13 0.00 Fair CLR 27.5 12.6 40% 27 76.25 0.0
24 17:35 SW 17 0.00 Fair CLR 27.4 11.8 38% 27 76.25 0.0
24 17:15 SW 20 0.00 Fair CLR 27.9 12.5 39% 27 76.25 0.0
24 16:55 SW 13 0.00 A Few Clouds FEW060 27.9 12.8 39% 28 76.25 0.0
24 16:35 SW 19 0.00 A Few Clouds FEW060 28 13 40% 28 76.25 0.0
24 16:15 Calm 0.00 A Few Clouds FEW260 26.8 13.9 45% 27 76.25 0.0
24 15:55 Vrbl 7 0.00 Fair CLR 26.9 12.1 40% 27 76.25 0.0
24 15:35 W 7 0.00 Fair CLR 27.9 12.8 39% 28 76.25 0.0
24 15:15 Vrbl 7 0.00 A Few Clouds FEW310 27.7 12.8 40% 27 76.28 0.0
24 14:55 Calm 0.00 A Few Clouds FEW060 26.6 12.4 41% 27 76.28 0.0
24 14:35 Calm 0.00 Fair CLR 26.8 12.5 41% 27 76.28 0.0
24 14:15 Calm 0.00 A Few Clouds FEW060 26.9 12.2 40% 27 76.3 0.0
24 13:55 NE 7 0.00 A Few Clouds FEW060 26.2 12.6 26.3 20.2 43% 26 76.3 0.0
24 13:35 Vrbl 11 0.00 A Few Clouds FEW060 26.2 12.8 43% 26 76.3 0.0
24 13:15 Vrbl 11 0.00 Fair CLR 26.2 12.8 43% 26 76.33 0.0
24 12:55 Calm 0.00 A Few Clouds FEW370 25.5 12 43% 26 76.35 0.0
24 12:35 Vrbl 9 0.00 A Few Clouds FEW370 25.6 12.4 44% 26 76.35 0.0
24 12:15 Vrbl 7 0.00 Fair CLR 25.5 12.5 44% 26 76.35 0.0
24 11:55 Vrbl 7 0.00 Fair CLR 25.4 12.5 45% 26 76.35 0.0
24 11:35 Vrbl 11 0.00 Fair CLR 24.6 12.2 46% 26 76.35 0.0
24 11:15 Vrbl 11 0.00 Fair CLR 24.5 12.9 48% 26 76.35 0.0
24 10:55 NW 13 0.00 Fair CLR 24.2 13.5 51% 25 76.35 0.0
24 10:35 Vrbl 11 0.00 Fair CLR 23.5 13.6 54% 76.35 0.0
24 10:15 Vrbl 9 0.00 Fair CLR 23.6 13.8 54% 76.35 0.0
24 09:55 Calm 0.00 Fair CLR 23.2 14 56% 76.35 0.0
24 09:35 Vrbl 7 0.00 Fair CLR 22.8 13.1 54% 76.35 0.0
24 09:15 Vrbl 9 0.00 Fair CLR 22.1 14 60% 76.35 0.0
24 08:55 Calm 0.00 Fair CLR 21.6 14.6 65% 76.35 0.0
24 08:35 Calm 0.00 Fair CLR 21.1 14.8 67% 76.35 0.0
24 08:15 Calm 0.00 Fair CLR 20.5 14.8 70% 76.35 0.0
24 07:55 NW 7 0.00 Fair CLR 19.9 15.4 19.9 15.6 75% 76.33 0.0 0.03 0.03
24 07:35 Calm 0.00 Fair CLR 19.1 16.2 83% 76.33 0.0
24 07:15 W 6 0.00 Fair CLR 18.5 16.3 87% 76.3 0.0
24 06:55 Calm 0.00 Fair CLR 17.6 15.9 90% 76.3 0.0
24 06:35 W 6 0.00 Fair CLR 16.4 15.9 97% 76.28 0.0
24 06:15 Calm 0.00 Fair CLR 15.7 15.7 100% 76.25 0.0
24 05:55 Calm 0.00 Fair CLR 15.8 15.8 100% 76.25 0.0
24 05:35 Calm 0.00 Fair CLR 16.1 16.1 100% 76.23 0.0
24 05:15 Calm 0.00 Fair CLR 16.6 16.1 97% 76.23 0.0
24 04:55 Calm 0.00 Fair CLR 17 16.2 95% 76.2 0.0
24 04:35 Calm 0.00 Fair CLR 16.7 16.3 98% 76.2 0.0
24 04:15 Calm 0.00 A Few Clouds FEW060 16.5 16.4 99% 76.17 0.0
24 03:55 W 6 0.00 A Few Clouds FEW060 16.9 16.8 99% 76.17 0.0
24 03:35 W 6 0.00 Fair CLR 16.7 16.7 100% 76.15 0.0
24 03:15 Calm 0.00 A Few Clouds FEW070 16.9 16.9 100% 76.15 0.0
24 02:55 Calm 0.00 Mostly Cloudy BKN070 17.1 17.1 100% 76.15 0.0
24 02:35 W 6 0.00 Mostly Cloudy BKN070 17 17 100% 76.15 0.0
24 02:15 W 6 0.00 Fair CLR 16.7 16.7 100% 76.15 0.0
24 01:55 W 6 0.00 Fair CLR 16.1 16.1 20.2 16 100% 76.12 0.0
24 01:35 W 6 0.00 Fair CLR 16 16 100% 76.12 0.0
24 01:15 W 6 0.00 Fair CLR 16.2 16.2 100% 76.1 0.0
24 00:55 W 6 0.00 Fair CLR 16.3 16.3 100% 76.12 0.0
24 00:35 W 6 0.00 Fair CLR 16.2 16.2 100% 76.12 0.0
24 00:15 W 6 0.00 Fair CLR 16.4 16.4 100% 76.1 0.0
23 23:55 Calm 0.00 Fair CLR 16.7 16.7 100% 76.12 0.0
23 23:35 Calm 0.00 Fair CLR 17 17 100% 76.12 0.0
23 23:15 Calm 0.00 Fair CLR 17.1 17.1 100% 76.12 0.0
23 22:55 Calm 0.00 Fair CLR 17.2 17.2 100% 76.12 0.0
23 22:35 Calm 0.00 Fair CLR 17.2 17.2 100% 76.12 0.0
23 22:15 Calm 0.00 Fair CLR 17.6 17.6 100% 76.1 0.0
23 21:55 Calm 0.00 Fair CLR 17.8 17.7 99% 76.07 0.0
23 21:35 Calm 0.00 Fair CLR 18.2 17.8 98% 76.1 0.0
23 21:15 Calm 0.00 Fair CLR 19.2 17.5 90% 76.07 0.0
23 20:55 Vrbl 6 0.00 Fair CLR 19.5 17.6 89% 76.07 0.0
23 20:35 Calm 0.00 Fair CLR 19.8 17.6 87% 76.07 0.0
23 20:15 Calm 0.00 Partly Cloudy SCT031 20 17.6 86% 76.05 0.0
23 19:55 Calm 0.00 Overcast BKN030 OVC100 20.3 18 21.8 19.4 87% 76.05 0.0
23 19:35 Calm 0.00 Overcast FEW021 SCT030 OVC095 20.4 18.1 87% 76.05 0.0
23 19:15 Vrbl 7 0.00 Overcast SCT022 OVC095 20.2 18.3 89% 76.05 0.0
23 18:55 Vrbl 9 0.00 Overcast OVC022 20.2 18.6 91% 76.02 0.0
23 18:35 Vrbl 6 0.00 Overcast FEW013 OVC025 20.4 18.9 91% 75.97 0.0
23 18:15 Vrbl 9 0.00 Overcast BKN023 OVC090 19.9 18.7 93% 75.95 0.0
23 17:55 Vrbl 7 0.00 Overcast SCT009 BKN016 OVC085 19.5 18.7 95% 75.92 0.0
23 17:35 Vrbl 6 0.00 Overcast BKN010 OVC015 19.6 18.9 96% 75.92 0.0
23 17:15 Calm 0.00 Overcast BKN012 OVC017 19.8 19.1 96% 75.9 0.0
23 16:55 Vrbl 6 0.00 Overcast BKN013 OVC024 19.5 18.8 96% 75.92 0.0
23 16:35 Vrbl 6 0.00 Overcast BKN009 BKN016 OVC022 19.6 19.3 98% 75.9 0.0
23 16:15 Vrbl 9 0.00 Overcast SCT009 BKN014 BKN020 OVC050 20.1 19.9 99% 75.9 0.0
23 15:55 Vrbl 9 0.00 Overcast SCT010 OVC014 20.2 19.9 98% 75.9 0.0
23 15:35 Vrbl 7 0.00 Overcast OVC011 20.2 20 99% 75.92 0.0
23 15:15 Vrbl 7 0.00 Overcast BKN011 OVC019 20.4 20.2 99% 75.9 0.0
23 14:55 Vrbl 7 0.00 Overcast FEW010 BKN019 OVC025 20.6 20.3 98% 75.9 0.0
23 14:35 Vrbl 11 0.00 Overcast FEW009 BKN019 OVC027 20.6 20.3 98% 75.9 0.0
23 14:15 Vrbl 9 0.00 Overcast FEW007 BKN020 OVC030 20.9 20.8 99% 75.87 0.0
23 13:55 Vrbl 9 0.00 Overcast SCT018 OVC030 23.9 21.5 26.3 23.7 86% 24 75.87 0.0
23 13:35 Vrbl 6 0.00 Overcast FEW017 BKN026 OVC036 24.1 21.6 86% 24 75.84 0.0
23 13:15 Calm 0.00 Overcast OVC027 24.7 22.1 86% 25 75.87 0.0
23 12:55 Calm 0.00 Overcast BKN019 OVC027 24.5 22 86% 25 75.87 0.0
23 12:35 Vrbl 7 0.00 Overcast BKN021 BKN027 OVC034 25.2 22.2 84% 26 75.87 0.0
23 12:15 Calm 0.00 Overcast OVC021 25.1 22.2 84% 26 75.9 0.0
23 11:55 Vrbl 6 0.00 Overcast BKN017 OVC024 25.3 22.1 83% 26 75.9 0.0
23 11:35 Calm 0.00 Overcast BKN021 OVC027 25.8 22.5 82% 27 75.87 0.0
23 11:15 Calm 0.00 Overcast BKN019 BKN027 OVC040 25.9 22.1 80% 27 75.87 0.0
23 10:55 Vrbl 6 0.00 Mostly Cloudy SCT015 BKN040 BKN120 25.8 22.8 84% 27 75.84 0.0
23 10:35 Vrbl 6 0.00 Mostly Cloudy BKN014 BKN019 BKN130 25.9 22.6 82% 28 75.84 0.0
23 10:15 Calm 0.00 Mostly Cloudy BKN013 BKN120 25.4 22.9 86% 27 75.87 0.0
23 09:55 Calm 0.00 Mostly Cloudy SCT010 SCT015 BKN023 BKN120 24.5 23 91% 25 75.87 0.0
23 09:35 Vrbl 6 0.00 Overcast SCT009 BKN015 BKN021 OVC026 24.4 22.9 91% 24 75.87 0.0
23 09:15 NW 6 0.00 Overcast BKN008 BKN013 OVC020 24.1 23 94% 23 75.87 0.0
23 08:55 W 7 0.00 Overcast BKN008 OVC013 24 23.1 95% 23 75.84 0.0
23 08:35 W 9 0.00 Overcast SCT008 BKN012 OVC020 24 23.1 95% 23 75.84 0.0
23 08:15 W 7 0.00 Overcast FEW012 OVC020 24.2 23.2 94% 24 75.87 0.0
23 07:55 W 9 0.00 Overcast SCT007 OVC020 23.6 22.9 23.6 22.5 96% 75.84 0.0
23 07:35 W 7 0.00 Overcast BKN007 BKN011 OVC019 23.2 22.8 98% 75.87 0.0
23 07:15 SW 9 0.00 Overcast OVC007 23.1 22.8 98% 75.87 0.0
23 06:55 SW 9 0.00 Overcast OVC008 23 22.7 98% 75.87 0.0
23 06:35 SW 9 0.00 Overcast OVC010 22.8 22.5 98% 75.84 0.0
23 06:15 SW 6 0.00 Overcast BKN011 OVC140 22.6 22.4 99% 75.82 0.0
23 05:55 SW 6 0.00 Overcast FEW010 SCT023 OVC140 22.7 22.5 99% 75.82 0.0
23 05:35 SW 6 0.00 Mostly Cloudy BKN011 BKN022 22.8 22.4 98% 75.82 0.0
23 05:15 SW 6 0.00 Overcast OVC012 22.8 22.6 99% 75.79 0.0
23 04:55 Calm 0.00 Overcast OVC010 22.9 22.7 99% 75.79 0.0
23 04:35 Calm 0.00 Overcast BKN009 OVC013 22.8 22.6 99% 75.79 0.0
23 04:15 Vrbl 6 0.00 Overcast OVC007 23 22.7 98% 75.79 0.0
23 03:55 SW 7 0.00 Overcast OVC007 22.9 22.7 99% 75.82 0.0
23 03:35 S 9 0.00 Overcast OVC007 22.9 22.7 99% 75.82 0.0
23 03:15 SW 9 0.00 Overcast OVC006 22.8 22.7 99% 75.84 0.0
23 02:55 Vrbl 7 0.00 Overcast OVC006 22.8 22.6 99% 75.84 0.0
23 02:35 SW 11 0.00 Mostly Cloudy BKN007 BKN160 22.7 22.5 99% 75.84 0.0
23 01:55 Vrbl 6 0.00 Mostly Cloudy SCT005 BKN200 22.7 22.7 22.7 21 100% 75.87 0.0 0.05
23 01:35 S 7 0.00 Mostly Cloudy SCT005 BKN170 22.6 22.6 100% 75.87 0.0
23 01:15 Vrbl 6 0.00 Mostly Cloudy FEW007 BKN170 22.4 22.4 100% 75.84 0.0
23 00:55 Vrbl 7 0.00 A Few Clouds FEW005 22.3 22.3 100% 75.9 0.0
23 00:35 SE 9 0.00 A Few Clouds FEW005 22.2 22.2 100% 75.87 0.0
23 00:15 S 7 0.00 A Few Clouds FEW200 22.1 22.1 100% 75.87 0.0
22 23:55 Vrbl 7 0.00 Mostly Cloudy FEW140 BKN190 BKN230 22 21.9 99% 75.9 0.0
22 23:35 Calm 0.00 Mostly Cloudy FEW140 SCT190 BKN220 21.9 21.8 99% 75.92 0.0
22 23:15 S 11 0.00 Mostly Cloudy FEW090 SCT150 BKN220 21.9 21.5 98% 75.95 0.0
22 22:55 Vrbl 6 0.00 Mostly Cloudy BKN095 21.6 21.3 98% 75.97 0.0 0.05
22 22:35 Calm 0.00 Mostly Cloudy BKN100 21.6 21.3 98% 75.95 0.0
22 22:15 Calm 0.00 Overcast FEW065 BKN100 OVC140 21.5 21.2 98% 75.95 0.0
22 21:55 Calm 0.00 Mostly Cloudy FEW140 BKN160 21 21 100% 75.92 0.0
22 21:35 Calm 0.00 A Few Clouds FEW130 21.1 21.1 100% 75.9 0.0
22 21:15 Calm 0.00 Mostly Cloudy FEW080 SCT120 BKN150 21.3 21.3 100% 75.87 0.0
22 20:55 Calm 0.00 Mostly Cloudy FEW049 SCT080 BKN110 21.5 21.3 99% 75.92 0.0 0.05
22 20:35 Calm 0.00 Partly Cloudy FEW095 SCT120 21.5 21.3 99% 75.92 0.0 0.03
22 20:15 Calm 0.00 Overcast SCT055 BKN080 BKN100 OVC110 21.6 20.9 96% 75.9 0.0 0.03
22 19:55 Vrbl 6 0.00 Overcast FEW020 BKN046 OVC060 22.1 21.5 34.1 22.1 96% 75.95 0.0 0.03 0.03
22 19:35 NW 13 0.00 Mostly Cloudy FEW022 BKN028 BKN050 22.3 22.1 99% 75.92 0.0 0.03
22 19:15 NW 11 G 43 0.00 Mostly Cloudy SCT021 SCT030 BKN050 BKN065 23.8 22.5 92% 75.92 0.0
22 18:55 S 15 G 30 0.00 A Few Clouds FEW070 29.4 22.4 66% 33 75.77 0.0
22 18:35 S 15 0.00 A Few Clouds FEW380 29.8 22.5 65% 33 75.74 0.0
22 18:15 S 13 0.00 Fair CLR 30.2 22.5 63% 34 75.74 0.0
22 17:55 S 15 0.00 Fair CLR 31.4 22.4 59% 35 75.74 0.0
22 17:35 SE 13 0.00 Fair CLR 31.2 22.2 59% 35 75.77 0.0
22 17:15 SE 22 0.00 Fair CLR 31.4 22.2 58% 35 75.79 0.0
22 16:55 SE 22 G 30 0.00 Fair CLR 32.3 22.4 56% 37 75.82 0.0
22 16:35 S 17 0.00 Fair CLR 31.9 22.4 57% 36 75.84 0.0
22 16:15 S 15 G 28 0.00 A Few Clouds FEW049 32.2 22.4 56% 36 75.84 0.0
22 15:55 SE 15 0.00 Fair CLR 32.5 23.1 58% 38 75.87 0.0
22 15:35 SE 20 G 33 0.00 A Few Clouds FEW065 32.2 22.9 58% 37 75.9 0.0
22 15:15 SE 17 0.00 Mostly Cloudy BKN060 BKN110 31.3 22.5 60% 35 75.92 0.0
22 14:55 SW 13 0.00 Mostly Cloudy SCT060 SCT075 BKN290 BKN360 33 19.1 44% 35 75.92 0.0
22 14:35 S 15 G 33 0.00 Partly Cloudy FEW070 SCT360 33.8 19.1 42% 36 75.92 0.0
22 14:15 S 20 G 31 0.00 Partly Cloudy FEW070 SCT340 SCT370 33.2 19 43% 35 75.92 0.0
22 13:55 S 17 G 39 0.00 A Few Clouds FEW320 32.9 19.4 33.5 25.5 45% 35 75.95 0.0
22 13:35 SW 15 0.00 Partly Cloudy FEW055 SCT320 SCT360 33.2 19.9 46% 35 75.97 0.0
22 12:55 S 17 G 30 0.00 A Few Clouds FEW047 32.6 20.5 49% 35 76 0.0
22 12:35 S 15 G 26 0.00 A Few Clouds FEW320 31.6 20.8 53% 34 76 0.0
22 12:15 S 19 G 26 0.00 A Few Clouds FEW350 31.3 20.7 53% 34 76.02 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)