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Publication Number: FHWA-RD-06-067
Date: March 2006

Guidelines for The Collection of Long-Term Pavement Performance Data

Chapter 3. Climatic Data

3.1 Introduction to Climatic Data

The climatic data include the data necessary to characterize the environment in which the pavement has existed since its construction and throughout the monitoring period. The climatic data elements include:

LTPP climatic data have been developed from data obtained from the National Climatic Data Center (NCDC) and the Canadian Climatic Center (CCC). For each GPS test section and SPS project, up to five nearby weather stations were identified. Daily measurements for the selected data items were obtained for each of the identified weather stations. The data for these weather stations were used to estimate site specific climatic stations referred to as virtual weather data. The daily values are summarized to monthly and annual statistics including the mean, standard deviation, minimum, and maximum.

3.2 References Used for Climatic Data

The general reference for the collection and accumulation of climatic data is provided by:

This chapter provides a brief overview of the efforts involved in obtaining climatic data for LTPP GPS test sections. It was updated as referenced below:

A separate set of documents was prepared in 1993 to describe data obtained from the National Oceanic and Atmospheric Association (NOAA). It also provides details describing how the data obtained were accumulated and stored in the LTPP database. These data were available in a standard release of LTPP data until 1999. The first document is specific to GPS test sections, and the second is specific to SPS projects. The SPS document dated January 1993 was revised and re-released in May 1993.

Environmental data from each test section were replaced with a revised and more complete set of data in 1999. The following document describes how these data were accumulated into the set of statistics that were subsequently stored in the LTPP database.


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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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