Operational Climatic Data Summary (OCDS) LOCATION_ID: ICAO_KHOP STATION NAME: CAMPBELL AAF / FT CAMPBELL KENTUCKY USA, KYLOCATION(DEGREES): N 36.669 W 87.496 ELEVATION: 573 ft / 174.65 m PREPARED BY: 557 WW / 14 WS UTC TO LST: -6 MEAN POR: 2014/01/01 - 2023/12/31 EXTREME POR: 1943/07/15 - 2024/12/31 DETAILED POR: 1943-1945, 1950-1970, 1973-2024 YEAR(S): Period of Record (see mean POR >>>) Authoritative climate summary - data quality and quantity sufficient to produce accurate climatological values Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Extreme Max (F) 75 86 88 91 97 108 106 106 104 95 86 78 108 Average Max (F) 47 51 61 70 78 86 88 86 83 72 59 53 70 Daily Average (F) 39 42 50 59 67 75 78 76 71 61 49 46 59 Average Min (F) 30 33 41 49 60 67 71 69 62 52 40 36 51 Extreme Min (F) -20 -12 -2 21 33 43 49 46 36 23 -4 -14 -20 Max Diurnal Range (F) 49 50 47 47 40 40 38 40 47 43 43 50 50 Average # Days >= 90 F 0 0 0 0 0 6 13 8 5 # 0 0 32 Average # Days <= 32 F 20 16 7 1 0 0 0 0 0 # 10 13 67 Average # Days <= 0 F # # # 0 0 0 0 0 0 0 0 # 1 Precipitation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Monthly Max (In) 10.1 11.5 14.0 10.3 13.1 12.3 16.2 10.7 10.2 9.4 13.2 11.9 67.8 Monthly Average (In) 3.8 4.2 4.8 4.2 4.5 3.6 3.8 3.4 3.1 3.0 3.9 4.2 46.8 Monthly Min (In) 0.0 0.0 0.5 0.0 0.4 0.3 0.8 0.2 0.2 0.0 0.5 0.7 31.9 Daily Max (In) 6.3 3.9 7.0 3.8 5.6 4.0 3.9 3.6 5.7 3.8 5.3 3.9 7.0 Monthly Max Snowfall (In) 15.8 18.8 24.9 5.8 0.0 0.0 0.0 0.0 0.0 1.0 5.3 12.1 39.9 Monthly Average Snowfall (In) 3.3 3.1 1.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.4 1.5 10.2 Daily Max Snowfall (In) 6.8 8.0 11.6 5.8 0.0 0.0 0.0 0.0 0.0 1.0 5.0 7.2 11.6 Days with Liquid = Trace 6 7 4 6 7 6 6 6 7 5 2 3 63 Days with Liquid >= 0.01" 10 10 12 12 11 10 12 11 6 9 9 11 123 Days with Liquid >= 0.5" 2 4 4 3 3 3 3 3 2 2 2 2 33 Days with Frozen = Trace 5 4 2 0 0 0 0 0 0 0 1 3 15 Days with Frozen >= 0.05" 2 2 1 0 0 0 0 0 0 0 0 1 7 Days with Frozen > 1.5" 1 1 0 0 0 0 0 0 0 0 0 0 2 Moisture Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Average Max RH (%) 89.1 89.6 88.9 89.5 94.7 96.0 97.6 98.0 97.0 94.8 89.4 91.6 93.0 Average Min RH (%) 50.2 48.9 42.1 38.8 48.2 48.4 52.6 53.3 48.4 46.8 44.4 53.4 48.0 Extreme Max Dew Point (F) 68 72 71 77 79 85 84 84 81 76 72 72 85 Average Dew Point (F) 33 35 42 49 60 67 71 70 64 53 41 40 52 Extreme Min Dew Point (F) -33 -21 -8 4 11 32 33 34 26 -11 -13 -22 -33 Average Vapor Pressure (In Hg) 0.22 0.24 0.30 0.38 0.55 0.69 0.78 0.75 0.61 0.44 0.29 0.28 0.46 Wind Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Prevailing Direction S N S S S S $SW $S $N $S $S S $S Average Prevailing Speed (kts) 8.2 8.0 9.1 8.2 7.0 6.8 7.4 6.0 7.0 6.6 7.6 8.4 7.4 Extreme Max Speed (kts) 46.0 54.0 49.0 41.0 40.8 40.0 35.9 37.9 35.9 42.9 35.0 51.1 54.0 Extreme Max Gust (kts) 60.0 77.1 73.0 55.0 65.1 63.9 57.1 64.1 54.0 47.0 53.0 60.0 77.1 Average Speed (kts) 7.4 7.8 7.8 7.8 6.8 6.2 5.6 5.1 5.1 6.0 6.4 7.0 6.6 Pressure Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Extreme Max Pressure Altitude (ft) 1270 1391 1476 1263 1115 1043 823 1211 1260 1125 1201 1263 1476 Weather Occurrence Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Average # Fog Days (FG/BR) 11 12 11 8 8 7 9 10 9 11 10 11 117 Average # Thunderstorm Days 1 2 5 4 7 7 9 7 3 2 1 2 50 Average # Precip Days 16 17 16 17 16 15 18 18 12 14 12 15 184 Average # Rain Days 13 14 16 17 16 15 18 18 12 14 12 14 177 Average # Freezing Rain Days 1 2 # 0 0 0 0 0 0 0 # # 3 Clouds Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann Average Cloud Cover (x/8) 6 6 5 5 4 4 4 4 3 4 4 6 5 % Frequency of Wind > 25 kts Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 2.0 3.2 3.7 3.6 2.8 3.5 7.7 0.9 0.9 0.4 2.5 3.1 2.9 20-22 LST 2.6 2.9 2.2 4.5 1.4 0.7 0.9 0.5 0.0 0.2 2.6 1.2 1.7 23-01 LST 2.5 1.6 2.6 5.8 3.1 0.8 1.0 0.0 2.9 0.5 2.6 4.4 2.4 02-04 LST 2.6 1.4 2.5 3.3 0.8 0.1 0.0 0.1 2.8 0.4 4.5 2.1 1.7 05-07 LST 2.3 2.9 2.6 1.6 0.1 0.3 0.7 0.0 1.8 0.1 1.4 0.6 1.2 08-10 LST 2.9 2.4 4.1 4.0 1.7 1.4 1.0 0.4 1.7 0.4 2.4 1.4 2.0 11-13 LST 3.4 3.9 7.2 7.0 2.7 4.2 5.8 1.8 2.0 2.8 1.9 3.6 3.9 14-16 LST 4.8 5.7 7.1 8.0 5.6 4.9 2.8 4.7 1.8 2.0 3.4 2.7 4.6 All Hours 2.9 3.0 4.0 4.7 2.2 2.0 2.5 1.0 1.8 0.8 2.7 2.4 2.5 % Frequency of Fog (FG/BR) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 13.4 12.9 8.9 4.2 6.1 5.8 12.7 7.5 5.8 9.8 8.1 11.7 9.1 20-22 LST 18.3 12.5 18.3 6.7 5.7 8.7 8.2 9.4 5.3 11.8 11.2 16.9 11.5 23-01 LST 22.4 14.8 18.2 15.0 9.3 13.0 13.8 15.3 10.7 18.3 12.8 19.5 15.6 02-04 LST 20.6 25.1 16.8 20.4 18.8 12.3 18.4 31.3 22.3 22.7 17.3 20.7 20.8 05-07 LST 24.0 30.0 21.1 21.8 14.9 12.1 20.6 23.9 27.6 27.6 28.6 21.6 23.0 08-10 LST 18.1 20.4 12.0 5.1 8.2 9.0 8.8 6.9 10.1 14.7 15.4 18.2 12.4 11-13 LST 11.2 11.5 8.9 6.4 11.7 6.1 8.3 7.0 6.3 12.5 9.0 12.6 9.4 14-16 LST 12.6 20.5 9.6 9.4 10.0 6.5 6.6 9.1 4.4 11.5 10.4 9.0 10.1 All Hours 17.7 18.9 14.3 11.5 10.9 9.2 12.3 14.4 12.3 16.4 14.5 16.5 14.2 % Frequency of Thunderstorms Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 0.1 2.2 3.5 4.8 11.0 9.9 19.7 7.7 4.0 4.5 0.6 2.4 5.7 20-22 LST 0.5 2.1 5.2 5.1 4.2 10.2 10.4 5.7 0.5 1.4 1.9 3.8 4.2 23-01 LST 1.3 1.1 2.7 4.7 5.0 5.4 8.8 4.1 0.6 2.0 0.4 2.9 3.2 02-04 LST 0.8 1.9 2.3 4.2 3.0 0.5 6.7 3.9 0.9 0.5 2.9 4.3 2.7 05-07 LST 1.2 3.2 3.2 3.4 1.7 2.7 5.6 2.7 2.1 2.0 0.6 0.8 2.4 08-10 LST 1.6 4.1 0.8 1.7 2.5 5.5 7.3 5.9 3.0 0.5 0.3 0.2 2.8 11-13 LST 0.6 1.0 2.8 1.4 9.5 10.3 21.7 8.4 4.4 0.3 0.3 1.2 5.2 14-16 LST 0.3 1.2 6.5 6.6 15.1 14.9 14.4 19.5 6.3 0.3 1.2 0.6 7.1 All Hours 0.8 2.2 3.4 4.0 6.4 7.4 11.7 7.2 2.7 1.4 1.1 2.1 4.1 % Frequency of Rain Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 15.7 26.5 20.8 27.7 25.1 21.2 29.2 21.6 15.7 24.8 20.1 22.5 22.7 20-22 LST 17.7 28.8 23.4 27.2 17.4 24.2 22.8 16.5 10.2 16.8 21.0 24.4 21.2 23-01 LST 19.6 26.7 22.3 24.9 19.4 17.6 18.4 11.9 12.4 18.6 16.4 26.7 20.0 02-04 LST 17.8 22.0 21.2 26.6 22.7 10.5 15.2 16.8 12.2 18.6 21.3 26.1 19.6 05-07 LST 17.5 24.3 22.7 23.8 24.3 18.1 24.4 16.4 16.7 22.7 15.3 23.1 20.9 08-10 LST 19.2 28.2 22.9 20.1 22.0 21.5 21.5 21.7 23.7 22.8 13.2 16.6 21.2 11-13 LST 17.9 22.4 23.2 22.6 28.9 23.4 32.0 25.0 20.7 23.9 18.2 19.7 23.2 14-16 LST 20.1 28.2 25.5 29.7 27.9 23.8 26.5 32.1 19.3 22.2 20.6 19.4 24.7 All Hours 18.2 25.8 22.8 25.3 23.6 20.1 23.8 20.3 16.7 21.3 18.2 22.4 21.6 % Frequency of Snow or Ice Pellets Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 6.7 7.3 2.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.6 0.9 1.6 20-22 LST 6.8 4.5 3.4 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.9 2.7 1.7 23-01 LST 6.2 5.0 2.3 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.7 1.4 02-04 LST 5.4 10.4 3.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.5 0.6 1.8 05-07 LST 5.2 7.7 5.0 1.2 0.0 0.0 0.0 0.0 0.0 0.0 1.7 1.3 2.0 08-10 LST 9.0 8.9 2.0 0.7 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.3 2.0 11-13 LST 6.1 7.9 2.2 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.6 1.0 1.5 14-16 LST 7.3 9.5 2.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.5 0.3 1.8 All Hours 6.6 7.7 2.9 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.7 1.1 1.7 % Frequency of Ceiling & Visibility < 100 ft / 0.25 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 20-22 LST 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 23-01 LST 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 02-04 LST 0.0 0.0 0.0 0.2 0.0 0.1 0.0 0.0 0.0 0.1 0.2 0.0 0.1 05-07 LST 0.1 0.1 0.0 0.6 0.2 0.1 0.1 0.3 0.5 0.0 0.2 0.2 0.2 08-10 LST 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.5 0.1 11-13 LST 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 14-16 LST 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 All Hours 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.1 0.0 0.1 0.1 0.0 % Frequency of Ceiling & Visibility < 200 ft / 0.5 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 0.0 0.0 0.0 0.0 0.0 0.1 0.2 0.1 0.0 0.1 0.0 0.1 0.1 20-22 LST 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 0.1 0.0 23-01 LST 0.1 0.0 0.2 0.2 0.0 0.0 0.1 0.0 0.0 0.6 0.1 0.2 0.1 02-04 LST 0.0 0.7 0.4 0.9 0.5 0.1 0.4 0.3 0.7 1.0 0.8 0.5 0.5 05-07 LST 0.4 0.2 0.5 1.0 0.6 0.2 1.0 1.0 1.0 1.0 1.4 1.1 0.8 08-10 LST 0.4 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.6 0.9 0.2 11-13 LST 0.0 0.2 0.0 0.0 0.1 0.1 0.2 0.0 0.0 0.0 0.1 0.0 0.1 14-16 LST 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 All Hours 0.1 0.1 0.1 0.3 0.1 0.1 0.2 0.2 0.2 0.4 0.4 0.4 0.2 % Frequency of Ceiling & Visibility < 300 ft / 1 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 2.0 1.0 1.0 0.1 0.1 0.3 0.4 0.3 0.0 0.9 1.0 1.8 0.8 20-22 LST 2.2 1.3 1.0 0.3 0.2 0.6 0.2 0.5 0.1 1.2 1.0 2.3 0.9 23-01 LST 3.9 2.4 2.1 1.0 1.1 0.4 1.1 0.9 0.3 2.4 1.5 3.8 1.7 02-04 LST 4.0 3.8 2.7 2.1 1.9 1.3 2.3 3.0 2.3 3.4 2.5 4.7 2.8 05-07 LST 5.0 4.3 2.5 2.5 1.9 1.1 2.9 3.7 3.3 3.3 3.5 4.1 3.2 08-10 LST 3.2 1.9 1.7 0.3 0.2 0.2 0.9 1.0 0.8 0.9 1.7 3.6 1.4 11-13 LST 1.1 1.3 0.7 0.2 0.3 0.2 0.4 0.0 0.1 0.3 0.5 1.1 0.5 14-16 LST 0.7 1.9 0.3 0.5 0.2 0.2 0.4 0.1 0.2 0.5 0.1 0.8 0.5 All Hours 2.8 2.2 1.5 0.9 0.7 0.5 1.1 1.2 0.9 1.6 1.5 2.8 1.5 % Frequency of Ceiling & Visibility < 500 ft / 1.5 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 4.8 5.3 2.4 1.1 0.4 0.5 0.4 0.3 0.8 2.5 2.7 4.9 2.2 20-22 LST 4.6 4.3 2.9 1.1 1.5 0.7 0.3 0.9 0.8 2.6 2.6 6.2 2.4 23-01 LST 6.0 5.9 3.8 2.6 1.6 1.0 1.4 2.2 0.9 4.5 3.5 6.7 3.3 02-04 LST 6.2 8.6 5.7 3.8 3.5 2.7 3.7 5.0 3.3 5.8 4.9 8.8 5.2 05-07 LST 7.4 6.8 6.5 5.4 3.3 2.8 4.8 6.3 4.8 6.4 5.6 9.3 5.8 08-10 LST 7.6 5.7 4.6 2.0 1.4 1.2 1.5 1.9 1.9 3.8 3.7 7.2 3.6 11-13 LST 5.2 3.4 2.5 0.9 1.0 0.3 0.7 0.1 0.5 2.1 2.2 4.8 2.0 14-16 LST 4.8 5.6 2.2 0.8 0.3 0.5 0.5 0.2 0.3 2.0 2.6 3.2 1.9 All Hours 5.8 5.7 3.8 2.2 1.6 1.2 1.7 2.1 1.7 3.7 3.5 6.4 3.3 % Frequency of Ceiling & Visibility < 800 ft / 2 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 8.0 10.2 4.8 2.0 1.1 0.5 0.8 0.5 2.2 5.0 4.5 8.4 4.0 20-22 LST 8.7 9.1 5.4 2.1 2.5 0.9 0.8 1.9 1.2 5.9 4.1 9.3 4.3 23-01 LST 8.6 9.3 6.8 4.1 3.7 2.5 1.5 3.0 2.8 7.0 5.1 10.7 5.4 02-04 LST 9.1 11.5 7.4 6.0 5.1 4.5 5.2 6.6 5.7 8.2 6.2 12.6 7.3 05-07 LST 10.1 11.3 8.3 7.5 7.1 7.0 8.3 9.6 7.5 8.9 8.2 13.3 8.9 08-10 LST 11.7 11.1 7.1 4.0 4.2 3.2 3.2 5.2 5.1 8.5 6.0 12.1 6.8 11-13 LST 10.0 9.2 5.8 1.7 2.1 0.9 0.9 0.6 1.9 4.4 5.1 11.5 4.5 14-16 LST 9.3 9.8 3.8 2.0 0.6 0.5 0.7 0.7 1.5 3.5 4.6 8.0 3.7 All Hours 9.4 10.2 6.2 3.7 3.3 2.5 2.7 3.5 3.5 6.4 5.5 10.7 5.6 % Frequency of Ceiling & Visibility < 1000 ft / 2 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 9.8 12.5 5.9 3.0 1.8 0.6 1.1 0.9 2.5 5.9 5.7 10.0 4.9 20-22 LST 10.4 12.5 6.9 3.3 3.3 1.2 0.9 2.1 2.1 6.8 5.9 11.4 5.5 23-01 LST 10.5 11.7 8.4 5.0 4.5 2.9 2.3 3.6 3.8 8.7 5.9 12.8 6.7 02-04 LST 10.8 14.6 8.8 6.6 6.9 5.5 6.2 7.4 6.7 10.7 7.6 15.2 8.9 05-07 LST 12.1 14.3 10.1 9.3 9.3 8.6 9.4 11.3 9.7 12.1 8.8 16.0 10.9 08-10 LST 14.5 14.9 9.5 5.9 5.7 5.1 5.3 7.6 6.9 11.4 7.6 14.6 9.1 11-13 LST 12.3 12.8 7.5 3.0 3.7 1.7 1.0 1.3 3.2 6.3 6.4 14.7 6.1 14-16 LST 11.1 13.2 5.0 2.8 0.8 0.8 0.7 0.7 2.6 4.6 6.2 10.9 4.9 All Hours 11.4 13.3 7.8 4.9 4.5 3.3 3.4 4.4 4.7 8.3 6.8 13.2 7.1 % Frequency of Ceiling & Visibility < 1500 ft / 3 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 13.3 18.6 8.8 4.8 2.6 1.1 1.3 2.4 3.4 8.5 9.5 13.9 7.3 20-22 LST 15.3 17.8 9.4 5.3 3.8 2.5 1.3 3.1 3.3 9.4 9.8 15.5 8.0 23-01 LST 14.5 16.3 12.7 8.9 5.7 3.7 3.5 5.5 5.5 11.1 10.1 16.4 9.5 02-04 LST 17.2 21.5 14.1 10.1 8.7 7.4 7.0 9.4 8.4 12.7 9.9 20.7 12.2 05-07 LST 19.1 21.8 14.7 13.7 12.0 10.7 11.7 14.0 13.4 15.6 11.0 23.0 15.0 08-10 LST 20.6 22.3 15.5 10.3 10.2 9.8 9.6 13.5 11.7 15.1 10.1 21.9 14.2 11-13 LST 18.2 20.5 13.6 6.4 6.7 5.0 2.2 3.5 5.7 10.9 10.1 20.5 10.3 14-16 LST 13.9 19.3 9.7 5.0 2.6 1.8 1.5 1.6 4.3 8.0 9.8 16.1 7.7 All Hours 16.5 19.8 12.3 8.1 6.5 5.2 4.8 6.6 7.0 11.4 10.0 18.5 10.5 % Frequency of Ceiling & Visibility < 3000 ft / 3 mi Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 17-19 LST 25.8 28.4 16.1 9.0 6.4 2.7 2.5 4.3 5.7 12.5 18.0 25.4 13.0 20-22 LST 27.1 27.7 15.5 9.5 5.8 4.1 2.2 4.7 4.9 12.8 17.6 26.6 13.1 23-01 LST 27.4 27.6 19.3 12.6 8.5 5.5 5.7 7.1 6.3 15.4 16.3 28.4 15.0 02-04 LST 31.0 32.5 22.7 16.9 12.5 9.0 7.9 10.6 10.0 17.5 18.5 31.8 18.4 05-07 LST 34.7 34.0 23.9 18.2 16.6 12.9 13.1 15.9 17.2 19.9 18.1 37.0 21.8 08-10 LST 34.6 33.0 27.1 18.9 17.5 16.2 14.0 18.9 16.0 21.7 20.8 35.9 22.9 11-13 LST 33.2 31.7 24.8 14.6 13.6 8.9 5.3 8.9 12.0 18.4 20.8 35.1 18.9 14-16 LST 29.0 29.9 20.1 11.0 8.1 3.5 2.9 4.6 7.4 14.1 18.7 27.1 14.6 All Hours 30.3 30.6 21.2 13.8 11.1 7.8 6.7 9.4 9.9 16.5 18.6 30.9 17.2 LEGEND: * = Data not Available *** = Variable Wind Direction Predominant # = Occurrences rounded to zero $ = Percent of Calm > Prevailing Direction Abs = Absolute ALSTG = Altimeter Setting DA = Density Altitude FG/BR = Fog/Mist LST = Local Standard Time RH = Relative Humidity SLP = Sea Level Pressure Spec = Specific Std Dev = Standard Deviation T = Trace Vis = Visibility