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Outdoor Temperatures and Relative Humidity - U.S. Winter and Summer Conditions

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The table below indicates the summer and winter design conditions in U.S. states and cities.

For full table with Summer Condtions - rotate the screen!

Outdoor Temperatures vs. Relative Humidity - U.S. Winter and Summer Conditions
StateCityJanuaryJuly
Average Daily Temperature
(oF)

Design Dry Bulb Temperature (oF)

Normal Relative Humidity (%)Average Daily Temperature
(oF)

Design Dry Bulb Temperature (oF)

Normal Relative Humidity (%)
7:30 am.1:30 pm.7:30 pm.7:30 am.1:30 pm.7:30 pm.
Alabama Birmingham   10 81 61 66   95 84 56 68
Mobile 52.5 10 81.5 95 90 64 78
Arizona Flagstaff   -10 83 58   90 77 36
Phoenix 53.9 25 75 47 39 89.6 105 53 31 23
Yuma   30 56 37 27   110 51 31 23
Arkansas Little Rock 42.4 5 80 67 68 80.5 95 85 55 59
California Eureka   30 87 77   90 92 80
Fresno   25 93 80 66   105 61 36 20
Los Angeles 52.1 35 63 46 51 68.3 90 85 50 54
Sacramento   30 90 82 70   100 76 46 28
San Diego   35 76 58 60   85 86 68 65
San Francisco   35 84 69 70   85 92 75 78
Colorado Denver 31.9 -10 54 37 41 70.6 95 55 27 30
Grand Junction   -15 77 64 64   95 48 27 22
Pueblo   -20 67 44 48   95 73 34 35
Connecticut New Haven   0 75 65 69   95 77 64 74
Delaware Wilmington 33.3 0 77 62 70 74.0 95 80 52 69
District of Columbia Washington 37.2 0 73 56 64 77.0 95 78 52 64
Florida Jacksonville   25 89 56 75   95 85 57 76
Miami 67.8 35 87 59 75 82.0 91 83 64 76
Georgia Atlanta 43.8 10 80 64 69 77.5 95 83 57 68
Augusta   10 84 59 69   98 83 55 69
Savannah   20 83 58 72   95 85 61 80
Idaho Boise 32.7 -10 82 75 74 70.8 95 54 34 23
Lewiston   -5 79 73 71   95 64 37 25
Illinois Cairo   0 81 69   98 83 57
Chicago 25.0 -10 81 70 75 71.2 95 78 51 55
Peoria   -10 73 72 77   96 81 53 58
Indiana Fort Wayne   -10 84 75 81   95 84 53 58
Indianapolis 29.1 -10 83 72 78 73.4 95 84 54 60
Terre Haute   0 82 70 76   95 77 50 56
Iowa Davenport   -15   95
Sioux City   -20 78 67 72   95 86 55 54
Kansas Dodge City   -10 78 57 61   95 77 45 52
Topeka   -10 78 64 67   100 85 54 54
Kentucky Louisville 35.2 0 78 68 69 75.9 95 77 52 57
Louisiana New Orleans 53.9 20 85 67 73 81.3 95 84 64 72
Shreveport   20 83 67 66   100 86 56 62
Maine Portland 23.4 -5 81 65 74 65.6 90 78 58 76
Maryland Baltimore 34.6 0 72 68 56 74.8 95 71 52 65
Massachusetts Boston 31.3 0 72 59 67 71.1 92 72 55 70
Michigan Detroit 25.9 -10 82 71 77 70.0 95 74 50 56
Grand Rapids   -10 85 78 80   95 76 51 54
Minnesota Duluth   -25 78 74 74   93 87 61 66
Minneapolis 16.0 -20 82 72 75 70.6 95 82 54 54
Mississippi Vicksburg   10 82 65 67   95 87 61 70
Missouri Kansas City   -10 78 64 66   100 76 48 47
St. Louis 32.3 0 77 65 68 76.9 95 73 50 55
Montana Billings   -25 67 73 60   90 65 40 33
Butte   -20 76 70 71   95 82 36 33
Nebraska North Platte   -20 80 62 66   85 84 50 46
Omaha 24.9 -10 82 68 73 75.3 65 80 51 51
Nevada Reno 34.0 -5 82 67 54 66.2 95 72 25 20
New Hampshire Concord 22.2 -15 78 60 69 67.1 90 80 49 69
New Jersey Atlantic City 33.6 5 79 68 74 72.2 95 81 72 82
Newark   0 72 79 65   95 75 51 65
Trenton   0 73 62 68   95 77 55 68
New Mexico Albuquerque 36.6 0 68 51 46 76.4 95 59 33 28
New York Albany   -10 75 63 71   93 79 52 64
Buffalo   -5 79 72 78   93 78 53 63
New York 33.8 0 72 61 66 74.5 95 75 58 68
Rochester   -5 81 73 79   95 80 50 60
North Carolina Asheville   0 82 59 69   93 88 56 73
Raleigh 41.1 10 82 57 69 76.2 95 86 55 72
North Dakota Bismarck 12.2 -30 77 71 75 67.8 95 85 52 49
Ohio Cincinnati   0 82 70 74   95 84 52 60
Cleveland 28.0 0 81 72 79 69.8 95 79 52 58
Columbus   -10 83 71 76   95 78 52 60
Toledo   -10 79 72 75   95 76 52 59
Oklahoma Oklahoma City 38.9 0 79 62 65 80.0 101 80 49 51
Oregon Baker   -5 83 81 78   90 69 68 36
Portland 41.0 10 87 82 78 63.8 90 86 63 48
Pennsylvania Harrisburg   0 72 49 65   95 78 51 62
Philadelphia   0 74 65 68   95 78 52 65
Pittsburgh 29.0 0 77 67 63 70.2 95 80 52 63
Scranton   -5 80 67   95 77 50
Rhode Island Providence 29.9 0 73 60 67 70.1 93 79 57 73
South Carolina Charleston   15 87 55 76   95 88 64 82
Columbia 46.2 10 81 57 65 79.6 95 83 56 68
South Dakota Huron   -20 79 72 76   95 86 52 49
Rapid City   -20 71 69 67   95 71 42 40
Tennessee Knoxville   0 83 65 69   95 83 55 66
Memphis   0 82 67 73   95 85 55 59
Texas Amarillo   -10 71 51 52   100 77 43 42
Corpus Christi   20 88 66 75   95 93 58 68
Dallas   10 81 62 62   100 79 50 47
El Paso   10 63 45 39   100 60 37 30
Houston 53.3 20 85 66 73 82.1 95 90 58 66
San Antonio   20 82 60 59   100 88 49 45
Utah Salt Lake City 31.0 -10 80 71 72 73.5 95 56 27 23
Vermont Burlington 19.1 -10 81 69 78 67.3 90 76 54 67
Virginia Richmond 38.5 15 84 60 68 76.0 95 81 57 72
Washington Seattle 41.0 15 86 80 74 63.0 85 86 63 47
Walla Walla   -5 80 74 78   95 50 33 22
West Virginia Charleston 35.1 0 79 64 70 73.0 95 88 53 67
Parkersburg   -10 82 66 74   95 80 52 65
Wisconsin Green Bay   -15 75 68 73   95 85 58 64
Milwaukee 22.3 -15 76 70 73 68.2 95 81 58 64
Wyoming Cheyenne 28.2 -15 59 48 55 65.9 95 73 36 40
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