NOAA U.S. Climate Normals

The U.S. Climate Normals are a large suite of data products that provide information about typical climate conditions for thousands of locations across the United States. Normals act both as a ruler to compare today’s weather and tomorrow’s forecast, and as a predictor of conditions in the near future. The official normals are calculated for a uniform 30 year period, and consist of annual/seasonal, monthly, daily, and hourly averages and statistics of temperature, precipitation, and other climatological variables from almost 15,000 U.S. weather stations. NCEI generates the official U.S. norma...

美国气候正常值（U.S. Climate Normals）是一套大型数据产品套件，可为美国境内数千个观测站点提供典型气候状况的相关信息。该正常值既可作为比对标尺，用于对比当日天气与次日预报，亦可作为近期气候状况的预测依据。官方气候正常值基于统一的30年周期计算生成，涵盖美国近15000个气象站的气温、降水及其他气候变量的年/季、月、日、小时级平均值与统计数据。美国国家环境信息中心（NCEI）负责生成官方美国气候正常值……