A significant portion of the LCD annual issue provides tables of normals, means, and extremes of weather conditions. Normals are updated every ten years. Normals are provided for monthly temperature maximums and minimums, heating and cooling degree days, and precipitation. Means or averages are given for such local climatic data as temperature, heating and cooling degree days, snowfall, precipitation, sky cover, and visibility. In addition to the monthly averages for the current year, monthly and annual overages are included for the last 30 years.
Record values are for the entire period of record.
Temperature and precipitation extremes also appear. Each annual report includes a brief narrative climatological summary. This is a plain-language description of climate over the year at the location. The LCD monthly issue provides tables which summarize the weather readings for each day of the month at a specific location. In addition, observational data are given in the monthly issue at 3-hour intervals.