Average Statewide Temperature for Western U.S. States
Each month, averages of temperature are calculated for U.S. Climate Divisions by simply averaging the data from all stations within the division that record both temperature. A division represents a region within a state that is climatically quasi-homogeneous or, in some cases, a semi-homogeneous drainage basin.
The average monthly temperature for a state is derived from the divisional values by weighting each division by its percentage of the total state area.
Source: National Climatic Data Center, Historical Climatography Series 4-1.
NORMALS JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC YEAR
Alaska 1931-60 0.2 3.9 9.6 24.3 38.6 49.7 53.5 50.9 42.5 28.7 12.6 2.2 26.4
1941-70 0.6 3.9 9.7 23.3 38.6 49.5 53.5 50.9 42.6 27.5 12.3 1.5 26.2
1951-80 -0.2 2.2 8.8 22.9 38.5 49.2 53.6 51.3 42.5 26.7 12.3 0.9 25.7
1961-90 1.4 2.6 10.4 22.8 38.8 49.6 54.2 51.4 42.7 26.4 11.1 3.4 26.2
1971-00 1.1 3.1 10.7 23.9 39.5 50.3 54.9 51.8 42.6 26.2 11.2 3.9 26.6
Arizona 1931-60 40.6 44.3 49.8 57.6 65.4 74.3 80.0 77.8 72.7 61.8 49.1 42.7 59.7
1941-70 40.9 44.7 49.1 57.0 65.4 74.0 80.0 77.8 72.4 61.8 49.6 42.2 59.6
1951-80 41.0 44.8 49.2 56.4 64.9 74.6 80.1 77.7 72.1 61.6 49.3 41.9 59.5
1961-90 41.2 45.4 49.8 57.0 65.4 74.9 80.1 77.9 71.8 61.3 49.7 41.9 59.7
1971-00 42.3 46.2 51.0 57.6 66.0 75.5 80.2 78.5 72.6 61.7 49.6 42.5 60.3
California 1931-60 43.3 46.4 50.6 56.3 62.3 68.8 75.2 73.8 69.7 60.9 51.1 45.3 58.6
1941-70 43.6 47.1 50.0 55.6 62.0 68.6 75.0 73.7 69.6 61.0 51.2 44.8 58.5
1951-80 43.9 47.6 50.2 55.1 61.9 69.3 75.1 73.9 69.6 61.2 51.1 44.8 58.6
1961-90 44.4 48.1 50.9 55.7 62.5 69.9 75.2 74.3 69.3 61.3 51.1 44.5 58.9
1971-00 45.1 48.5 51.8 56.5 63.1 70.2 75.3 74.6 69.9 61.6 51.1 45.0 59.4
Colorado 1931-60 23.8 27.3 33.6 43.5 52.9 62.3 68.2 66.6 58.8 48.1 34.1 26.8 45.5
1941-70 23.7 27.4 32.6 43.2 52.9 61.6 67.8 65.9 58.0 47.7 34.3 26.2 45.1
1951-80 23.1 27.4 33.1 42.6 52.6 62.1 67.9 65.6 57.7 47.4 33.7 25.7 44.9
1961-90 22.9 27.4 34.0 43.0 52.4 61.8 67.8 65.5 57.3 46.8 34.2 24.8 44.8
1971-00 23.7 28.3 35.6 43.1 52.5 62.2 67.6 65.7 57.7 46.6 33.5 25.2 45.1
Hawaii 1931-60 -999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9 -999.9
1941-70 -999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9 -999.9
1951-80 -999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9-999.9 -999.9
1961-90 67.0 66.9 67.5 68.4 69.8 71.3 72.1 72.7 72.7 72.0 70.2 68.1 69.9
1971-00 67.0 67.0 67.7 68.5 69.7 71.4 72.3 73.0 72.9 72.2 70.4 68.2 70.0
Idaho 1931-60 21.5 26.1 33.0 43.0 51.7 58.3 66.9 64.5 56.3 46.4 32.7 25.8 43.9
1941-70 21.8 27.3 32.4 42.1 51.1 57.8 66.4 64.4 55.9 45.7 33.2 25.2 43.6
1951-80 22.5 27.8 32.7 41.8 51.0 58.7 66.5 64.4 55.9 45.5 32.9 25.2 43.7
1961-90 22.7 27.9 34.4 42.6 51.1 59.4 66.4 65.0 55.6 45.4 33.3 24.0 44.0
1971-00 23.6 28.4 35.9 43.5 51.6 59.3 66.2 65.4 56.1 45.5 32.9 24.3 44.4
Montana 1931-60 16.7 20.7 28.8 41.7 52.2 59.3 67.6 65.3 55.4 45.1 30.3 22.6 42.1
1941-70 16.1 22.3 28.3 41.3 51.4 58.8 66.8 65.2 54.6 44.9 30.4 21.5 41.8
1951-80 15.3 22.9 29.2 40.8 51.5 59.7 66.7 65.0 54.8 44.7 30.0 21.5 41.9
1961-90 17.4 23.7 31.4 41.9 51.8 60.6 66.9 65.4 54.5 44.6 30.2 19.9 42.4
1971-00 18.4 24.4 32.9 42.5 52.2 60.6 66.4 65.6 55.1 44.3 29.7 20.8 42.7
Nevada 1931-60 29.2 33.4 39.8 48.0 56.0 64.2 72.6 70.4 62.4 51.3 38.8 32.1 49.8
1941-70 29.5 34.3 38.7 46.7 55.4 63.2 71.9 69.6 61.7 51.0 38.9 31.3 49.4
1951-80 29.9 34.9 39.0 46.0 55.1 64.1 72.0 69.6 61.5 50.9 38.7 31.1 49.4
1961-90 29.7 34.9 39.8 46.4 55.3 64.5 71.9 69.8 61.0 50.6 38.7 30.5 49.4
1971-00 30.4 35.5 41.2 47.3 55.7 64.8 71.9 70.2 61.6 50.6 38.4 30.9 49.9
New Mexico 1931-60 33.8 37.8 43.5 52.1 60.6 70.0 73.4 71.9 65.5 55.1 42.1 35.5 53.4
1941-70 33.8 37.8 42.8 52.0 60.8 69.5 73.6 71.8 65.2 54.9 42.6 35.2 53.3
1951-80 33.9 37.7 43.3 51.5 60.3 69.7 73.6 71.3 64.8 54.6 42.2 35.0 53.2
1961-90 33.5 37.9 43.9 51.8 60.4 69.3 73.3 71.0 64.4 54.3 42.8 34.8 53.1
1971-00 34.4 38.9 44.9 51.8 60.7 69.7 73.2 71.3 64.8 54.3 42.4 34.9 53.4
Oregon 1931-60 30.8 34.9 40.1 46.7 53.2 58.9 66.0 64.4 58.4 49.6 39.0 34.0 48.0
1941-70 31.0 36.2 39.7 45.7 52.7 58.8 65.8 64.3 58.4 49.2 39.5 33.8 47.9
1951-80 31.7 36.7 39.7 45.2 52.5 59.3 66.0 64.5 58.4 49.2 39.2 33.7 48.0
1961-90 32.0 36.7 40.7 45.6 52.5 59.9 65.8 65.2 58.0 49.1 39.2 32.6 48.1
1971-00 32.6 36.7 41.5 46.4 52.9 59.6 66.0 65.5 58.6 49.2 39.0 32.8 48.4
Utah 1931-60 24.2 29.3 37.2 46.9 55.8 64.3 72.2 70.1 61.8 50.1 35.8 28.0 48.0
1941-70 24.7 30.2 36.6 46.1 55.7 63.7 72.1 69.9 61.3 50.0 36.5 27.7 47.9
1951-80 25.1 30.7 37.1 45.7 55.5 64.7 72.5 69.9 61.2 49.9 36.4 27.2 48.0
1961-90 24.7 30.8 38.1 46.2 55.6 65.2 72.6 70.2 60.9 49.6 36.9 26.7 48.1
1971-00 25.9 31.5 39.7 46.9 55.9 65.6 72.5 70.6 61.5 49.5 36.3 27.3 48.6
Washington 1931-60 29.3 33.6 39.8 47.3 54.4 59.6 65.7 64.4 58.6 49.1 38.0 33.0 47.7
1941-70 29.3 35.1 39.5 46.4 53.8 59.6 65.6 64.4 58.5 48.6 38.3 32.5 47.6
1951-80 29.8 35.5 39.5 46.1 53.5 59.8 65.5 64.6 58.4 48.5 38.1 32.7 47.7
1961-90 30.8 35.8 40.9 46.6 53.5 60.3 65.5 65.4 58.3 48.4 38.4 31.6 48.0
1971-00 31.5 35.8 41.5 47.4 54.1 60.1 65.7 65.8 58.7 48.5 38.3 31.7 48.3
Wyoming 1931-60 18.6 22.1 28.9 40.1 50.1 58.8 66.8 64.8 55.3 44.7 30.0 22.9 41.9
1941-70 18.7 23.1 28.3 39.9 50.0 58.2 66.4 64.7 54.8 44.4 30.4 22.2 41.8
1951-80 18.3 23.5 29.0 39.5 50.1 59.2 66.7 64.4 54.7 44.2 29.7 21.9 41.8
1961-90 18.6 23.3 30.5 40.1 49.9 59.5 66.7 64.4 54.3 43.7 30.0 20.3 41.8
1971-00 19.2 23.7 32.1 40.4 50.0 59.6 66.3 64.7 54.7 43.4 29.2 20.7 42.0