Monthly logs include a daily account of temperature extremes and precipitation, along with snow data at some locations. U.S. Cooperative Observer Program (COOP) Network stations scattered across the continental U.S., a few from Caribbean and Pacific Island stations. Cooperative stations are assigned a six-digit COOPID in which the first two correspond to the state, and the last four are assigned roughly in alphabetical order by station name.

Observations from the Cooperative Hurricane Reporting Network (CHURN), a special network of stations that provided observations when tropical cyclones approached the southeastern U.S. Coast. Forms submitted to the local National Weather Service offices and archived at NCDC. Period of record 1957-2000

Single-year summaries of observations at Weather Bureau and cooperative stations across the United States. Predominantly the single page Form 1066, which includes monthly mean, maximum and minimum temperature, precipitation and snowfall, cloud cover and prevailing wind direction and the multi-page Form 1002 which includes many more elements. Overall period of record is 1822-1989, bulk 1906-1948.

Multi-year summaries of one or more meteorological elements at a station or in a state. Primarily includes Form 1078, a United States Weather Bureau form designed for recording monthly sums or means for a single element over multiple years. Period of record 1738-2003, bulk 1931-1950. Primarily United States, with a few records from Mexico.

Multi-year weather and climate summaries for stations across the United States. Includes U.S. Army Signal Service summaries for the period 1872-1888 on Form 106S.

Weather Bureau and US Army Corps and other reports of storms from 1886-1955. Hourly precipitation from recording rain gauges captured during heavy rain, snow, flooding, or hurricane events.

Daily weather observations from global land stations, recorded in synoptic code. Period of record 1950 only.

Surface Weather Observation 1001 Forms is a set of historical manuscript records for the period 1893-1948. The collection includes two very similar form types: Form 1001, in use by the US Weather Bureau, and Form 1, in use by the US Army and Navy. NCDC Climate Data Modernization Program (CDMP) scanned the vast majority of these forms in order to fill in the observation gap prior to the time when commercial aviation began in the U.S. Many forms contiaining observations taken on foreign soil have not yet been scanned.

Standard hourly observations taken at Weather Bureau/National Weather Service offices and airports throughout the United States. Hourly observations began during the aviation boom in the late 1920s-early 1930s, and continue through Automated Surface Observing Stations (ASOS) today. Files scanned from original manuscript records of raw meteorological data collected by first and second order stations located in the U.S., U.S. Pacific Islands, U.S. Virgin Islands, Puerto Rico, and by military weather stations located worldwide.

US Navy hourly observations taken at Naval bases worldwide. Observations begin 1995.