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99% WINTER DESIGN TEMPERATURES FOR THE CONTIGUOUS UNITED STATES
This map is a necessarily generalized guide to temperatures in the contiguous Unites States. Temperatures shown for
areas such as mountainous regions and large urban centers may not be accurate. The data used to develop this map
was taken from the 1993 ASHRAE Fundamentals Handbook (Chapter 24, Table 1: Climate Conditions for the United
States).
Reprinted with permission from NFPA 54: National Fuel Gas Code 1999, National Fire Protection Association, Quincy,
MA 02269. This reprinted material is not the complete and ofcial position of the National Fire Protection Association on
the referenced subject, which is represented only by the standard in its entirety.
−10
o
F
o
5
o
F
17
o
F
27
o
F
37
o
F
37
o
F
27
o
F
17
o
F
5
o
F
−10
o
F