Table 18. Monthly and annual average and extreme heating degree days (HDD) for CFA(a).

                                                                      Daily Extremes
                  Average         Highest          Lowest          Highest      Lowest
                   (HDD)           (HDD)           (HDD)            (HDD)       (HDD)

January            1,508           1,828           1,086              85          22
February           1,235           1,623             865              88          20
March              1,028           1,446             728              71          10
April                686             889             471              44           2
May                  417             623             206              35           0
June                 175             305              38              26           0
July                  25             192               0              16           0
August                46             192               0              20           0
September            268             493             100              36           0
October              656             955             433              55           0
November           1,062           1,342             860              74           8
December           1,445           1,799           1,181              93          18

ANNUAL             8,550          10,268           7,524              93           0

a. Data period of record spans January 1950 through December 2023.