10 0 CLOUD COVERING 1/2 OR LESS OF THE SKY THROUGHOUT THE APPROPP" RIATE PERIOD 21 1 CLOUD COVERING MORE THAN 1/2 OF THE SKY DURING PART OF THE A" PPROPRIATE PERIOD AND COVERING 1/2 OR LESS DURING PART OF TH" E PERIOD 32 2 CLOUD COVERING MORE THAN 1/2 OF THE SKY THROUGHOUT THE APPRP" PRIATE PERIOD 43 3 SANSTORM, DUSTSTORM OR BLOWING SNOW 54 4 FOG OR ICE OR THICK HAZE 65 5 DRIZZLE 76 6 RAIN 87 7 SNOW, OR RAIN AND SNOW MIXED 98 8 SHOWER(S) 109 9 THUNDERSTORM(S) WITH OR WITHOUT PRECIPITATION 1110 10 NO SIGNIFICANT WEATHER OBSERVED 1211 11 VISIBILITY REDUCED 1312 12 BLOWING PHENOMENA, VISIBILITY REDUCED 1413 13 FOG 1514 14 PRECIPITATION 1615 15 DRIZZLE 1716 16 RAIN 1817 17 SNOW OR ICE PELLETS 1918 18 SHOWERS OR INTERMITTENT PRECIPITATION 2019 19 THUNDERSTORM 2131 31 MISSING VALUE 22