NCDC TD3210 U.S. First Order Summary of Day

This data set from the National Climatic Data Center (NCDC) contains summary of the day first order station surface weather observations. The stations are operated by the National Weather Service (NWS), the Federal Aviation Administration (FAA), the U.S. Air Force (Air Weather Service), and the U.S. Navy (Navy Weather Detachment). The NWS and FAA sites are located in the contiguous U.S., Alaska, Puerto Rico, Hawaii and other Pacific Islands. The Air Force and Navy operate stations worldwide.

The observations were generally recorded midnight to midnight for the 24-hour period. The major data parameters are wind, maximum temperature, minimum temperature, wet-bulb temperature, dew-point temperature, maximum relative humidity, minimum relative humidity, precipitation, station pressure, sea level pressure, snowfall, snow depth, and present weather. The earliest data is for 1881 but most stations begin in 1948. Periods of record vary widely among the stations.

本数据集源自国家气候数据中心（NCDC），收录了国家级一阶气象站地面气象观测的汇总信息。这些气象站由美国国家气象服务局（NWS）、联邦航空管理局（FAA）、美国空军（空军气象服务）和美国海军（海军气象分队）运营。NWS和FAA站点位于美国本土、阿拉斯加、波多黎各、夏威夷以及其他太平洋岛屿。空军和海军在全球范围内运营气象站。观测数据通常记录自午夜至午夜，涵盖24小时周期。主要数据参数包括风速、最高气温、最低气温、湿球温度、露点温度、最高相对湿度、最低相对湿度、降水量、站压、海平面气压、降雪量、积雪深度以及当前天气状况。最早的数据记录始于1881年，但大多数站点的观测始于1948年。不同气象站的记录周期差异较大。