Sequences of extreme temperature and humidity for design calculations

Donald G. Colliver, Richard S. Gates, Hanzhong Zhang, K. Tom Priddy

Research output: Contribution to journalConference articlepeer-review


This paper reports on the development of the criteria and the procedures used to produce design sequences of near-extreme weather records for four design parameters: high and low dry-bulb temperature, high dew-point temperature, high enthalpy levels, and low wet-bulb depression. Design sequences, or groupings of actual hourly weather data, were obtained from 30-year, hourly weather records for 381 U.S. and Canadian locations. Four different extreme design sequences were determined for each parameter: the most extreme value for the period of record and the 0.4%, 1.0%, and 2.0% annual frequencies of occurrence. These design sequences were obtained from four different data window lengths: 24, 72, 120, and 168 hours. The data windows (or contiguous hourly readings) were developed using an `exclusive-overlapping' technique. In all cases, the mean value of the design variable for each data window was used to rank sequences. The time of occurrence, summary statistics of the extreme sequences, the hourly weather data in WYEC2 format for the time period of the four levels of extreme for each parameter and each location, and a computer program to select and output the desired data were produced on a CD-ROM.

Original languageEnglish (US)
Pages (from-to)133-144
Number of pages12
JournalASHRAE Transactions
Issue numberPt 1A
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 ASHRAE Winter Meeting. Part 1 (of 2) - San Francisco, CA, USA
Duration: Jan 18 1998Jan 21 1998

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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