A Original Monthly Record of Observations - Weather Bureau Form 1001 is a set of historical manuscript records archived at the National Climatic Data Center (NCDC). The major parameters that make up this file are in three parts: 1. Twice daily observations of: a. Station pressure and sea level pressure (in. Hg), b. Dry bulb, wet bulb, and dew point temperatures (deg. F), c. Maximum and minimum ... temperatures for the previous 12 hours (deg. F), d. Relative humidity (%), e. Wind direction (8 points) and speed (mph), f. Maximum wind speed for the previous 12 hours (MPH), g. Precipitation amount (in.) for the previous 12 hours, h. Cloud amount (10 ths), kind, and direction of movement (from scale to 8 points), i. State of weather (plain language). 2. Daily observations of: a. maximum and minimum temperature (deg. F), b. Average temperature with departure from normal (deg. F), c. Precipitation amount with departure from normal (in.) and beginning and ending times, d. Snowfall and snow depth (in.), e. Average cloud amount (10 ths), f. Character of day (clear, partly cloudy, cloudy). 3. Monthly means and extremes of the parameters in 1 and 2. The twice daily observations were not taken at the same time each day by those stations, nor were they taken at the same time historically by each station. Times of observations vary from 05 am to 12 pm and from 12 pm to midnight local standard time. Some of the twice daily, daily, and monthly observations, averages and extremes, are also presented in the 'climatological record book' file. The 'Index of Original Surface Weather Records' lists those stations and the period of record for which the manuscript records in this file are available. They are listed under meteorological summary which indicates that some type of monthly summary is on file in the NCDC archives. A number of parameters are also presented hourly. Later in the period of record 6-hourly data is presented instead of 12 hourly. Limited station history information is available on the first page of the summary.