Codes 00-09 General Group: No precipitation, fog, duststorm, sandstorm, drifting or blowing snow at the station at the time of observation or, except for 09 during the preceding hour 00 01 02 03 04 05 06 07 08 09 Cloud development NOT observed or NOT observable during past hour (not plotted) Clouds generally dissolving or becoming less developed during past hour (not plotted) State of sky on the whole unchanged during past hour (not plotted) Clouds generally forming or developing during past hour (not plotted) Visibility reduced by smoke Haze Widespread dust in suspension in the air, not raised by wind at or near the station at the time of observation Dust or sand raised by the wind at or near the station at the time of the observation, but no well-developed dust whirl(s), and no sandstorm seen: or, in the case of ships, blowing spray at the station Well developed dust whirl(s) or sand whirl(s) seen at or near the station during the preceding hour or at the time of observation, but no duststorm or sandstorm Duststorm or sandstorm within sight at the time of observation, or at the station during the preceding hour Codes 10-19 General Group: No precipitation at the station at the time of observation or, except 17, during the preceeding hour 10 11 12 13 14 15 16 17 18 19 Mist Patches of shallow fog at station, less than 2 meters on land or 10 meters at sea More or less continuous shallow fog at station, less than 2 meters on land or 10 meters at sea Lighting visible, no thunder heard Precipitation within sight, but NOT reaching the ground Precipitation within sight, reaching ground or the surface of the sea, but distant, i.e. estimated to be more than 5 km from the station Precipitation within sight, reaching the ground or the surface of the sea, near to (within 5 km), but not at the station Thunder heard, but no precipitation at the station Squall(s) within sight during past hour Funnel cloud(s) / Tornado(s) during the preceding hour or at time of observation Codes 20-29 General Group: Precipitation, fog, ice fog, or thunderstorm at the station during the preceeding hour but not at the time of observation 20 21 22 23 24 25 26 27 28 29 Drizzle (not freezing) or snow grains not falling as shower(s) ended in the past hour Rain (not freezing) not falling as shower(s) ended in the past hour Snow not falling as shower(s) ended in the past hour Rain and snow or ice pellets not falling as shower(s) ended in the past hour Freezing drizzle or freezing rain not falling as shower(s) ended in the past hour Shower(s) of rain ended in the past hour Shower(s) of snow, or of rain and snow ended in the past hour Shower(s) of hail, or of rain and hail ended in the past hour Fog or ice fog ended in the past hour Thunderstorm (with or without precipitation) ended in the past hour Codes 30-39 General Group: Duststorm, sandstorm, drifting or blowing snow 30 31 32 33 34 35 36 37 38 39 Slight or moderate duststorm or sandstorm (has decreased during the preceding hour) Slight or moderate duststorm or sandstorm (no appreciable change during the preceding hour) Slight or moderate duststorm or sandstorm (has begun or increased during the preceding hour) Severe duststorm or sandstorm has decreased during the preceding hour Severe duststorm or sandstorm has no appreciable change during the preceding hour Severe duststorm or sandstorm has begun or increased during the preceding hour Slight or moderate drifting snow (generally below eye level) Heavy drifting snow (generally below eye level) Slight or moderate blowing snow (generally above eye level) Heavy drifting snow (generally above eye level) Codes 40-49 General Group: Fog at the time of observation 40 41 42 43 44 45 46 47 48 49 Fog at a distance at the time of observation, but not at the station during the preceding hour, the fog or ice fog extending to a level above that of the observer Fog in patches Fog sky visible (has become thinner during preceding hour) Fog sky obscured (has become thinner during preceding hour) Fog sky visible (no appreciable change during the preceding hour) Fog sky obscured (no appreciable change during the preceding hour) Fog sky visible (has begun or has become thicker during the preceding hour) Fog sky obscured (has begun or has become thicker during the preceding hour) Fog, depositing rime ice, sky visible Fog, depositing rime ice, or ice fog, sky obscured Codes 50-59 General Group: Drizzle 50 51 52 53 54 55 56 57 58 59 Drizzle, not freezing, intermittent (slight at time of observation) Drizzle, not freezing, continuous (slight at time of observation) Drizzle, not freezing, intermittent (moderate at time of observation) Drizzle, not freezing, continuous (moderate at time of observation) Drizzle, not freezing, intermittent (heavy at time of observation) Drizzle, not freezing, continuous (heavy at time of observation) Drizzle, freezing, slight Drizzle, freezing, moderate or heavy Drizzle and rain, slight Drizzle and rain, moderate or heavy Codes 60-69 General Group: Rain 60 61 62 63 64 65 66 67 68 69 Rain, not freezing, intermittent (slight at time of observation) Rain, not freezing, continuous (slight at time of observation) Rain, not freezing, intermittent (moderate at time of observation) Rain, not freezing, continuous (moderate at time of observation) Rain, not freezing, intermittent (heavy at time of observation) Rain, not freezing, continuous (heavy at time of observation) Rain, freezing, slight Rain, freezing, moderate or heavy Rain or drizzle and snow, slight Rain or drizzle and snow, moderate or heavy Codes 70-79 General Group: Solid precipitation not in showers 70 71 72 73 74 75 76 77 78 79 Intermittent fall of snowflakes (slight at time of observation) Continuous fall of snowflakes (slight at time of observation) Intermittent fall of snowflakes (moderate at time of observation) Continuous fall of snowflakes (moderate at time of observation) Intermittent fall of snowflakes (heavy at time of observation) Continuous fall of snowflakes (heavy at time of observation) Ice needles (with or without fog) Snow grains (with or without fog) Isolated star-like snow crystals (with or without fog) Ice pellets (sleet) Codes 80-90 General Group: Showery precipitation 80 81 82 83 84 85 86 Rain shower(s), slight Rain shower(s), moderate or heavy Rain shower(s), violent Shower(s) of rain and snow mixed, slight Shower(s) of rain and snow mixed, moderate or heavy Snow shower(s), slight Snow shower(s), moderate or heavy 87 88 89 90 Shower(s) of snow pellets or small hail, slight with or without rain or rain and snow mixed Shower(s) of snow pellets or small hail, moderate or heavy with or without rain or rain and snow mixed Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder, slight Shower(s) of hail, with or without rain or rain and snow mixed, not associated with thunder, moderate or heavy Codes 91-99 General Group: Precipitation with current or recent thunderstorm 91 92 93 94 95 96 97 98 99 Thunderstorm during the preceding hour but not at time of observation with slight rain at time of observation Thunderstorm during the preceding hour but not at time of observation with moderate or heavy rain at time of observation Thunderstorm during the preceding hour but not at time of observation with slight snow, or rain and snow mixed, or hail at time of observation Thunderstorm during the preceding hour but not at time of observation with moderate or heavy snow, or rain and snow mixed, or hail at time of observation Thunderstorm, slight or moderate, without hail but with rain and/or snow at time of observation Thunderstorm, slight or moderate, with hail at time of observation Thunderstorm, heavy, without hail but with rain and or snow at time of observation Thunderstorm combined with duststorm or sandstorm at time of observation Thunderstorm, heavy, with hail at time of observation

Cloud Type Symbols

Station Report Symbols