DISTRICT OF COLUMBIA
Climate Normals (1971-2000)
other states
City:DALECARLIA RESERVOIR   
State:MD
Lat:38.56N
Long:077.07W
Elev:  150
ID:182325
Normal      Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec  Annual
Minimum     23.9  26.3  33.4  42.3  52.2  61.1  66.1  64.9  57.9  44.7  35.7  28.0  44.7
Maximum     44.0  48.4  57.9  68.9  77.6  85.2  89.1  87.4  80.7  69.8  58.6  48.4  68.0
Mean        34.0  37.4  45.7  55.6  64.9  73.2  77.6  76.2  69.3  57.3  47.2  38.2  56.4
Precip.     3.48  3.01  4.13  3.54  4.42  3.69  4.26  3.98  4.30  3.48  3.41  3.41 45.11
HDD          962   774   601   289    88     5     0     1    31   263   536   832  4382
CDD            0     0     0     7    84   249   390   345   160    23     0     0  1258
City:NATIONAL ARBORETUM DC  
State:MD
Lat:38.54N
Long:076.59W
Elev:   50
ID:186350
Normal      Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec  Annual
Minimum     24.0  26.0  33.4  42.2  52.4  61.8  66.9  64.8  56.9  44.1  35.7  28.2  44.7
Maximum     43.0  46.4  55.3  66.0  75.8  84.4  88.9  87.4  80.4  69.0  58.0  47.7  66.9
Mean        33.5  36.2  44.4  54.1  64.1  73.1  77.9  76.1  68.7  56.6  46.9  38.0  55.8
Precip.     3.57  2.84  3.92  3.26  4.29  3.63  4.21  3.90  4.08  3.43  3.32  3.25 43.70
HDD          977   807   641   332   108     6     0     1    35   283   544   837  4571
CDD            0     0     0     4    80   249   399   345   144    22     0     0  1243
City:WASHINGTON DULLES INTL 
State:VA
Lat:38.56N
Long:077.29W
Elev:  290
ID:448903
Normal      Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec  Annual
Minimum     21.9  24.1  31.8  40.2  49.9  59.0  64.0  62.8  55.6  42.3  33.8  26.0  42.6
Maximum     41.4  45.5  55.0  65.9  74.6  82.8  87.4  85.9  78.9  67.7  56.5  45.9  65.6
Mean        31.7  34.8  43.4  53.1  62.3  70.9  75.7  74.4  67.3  55.0  45.2  36.0  54.2
Precip.     3.05  2.77  3.55  3.22  4.22  4.07  3.57  3.78  3.82  3.37  3.31  3.07 41.80
HDD         1025   847   670   362   139    21     1     4    60   323   589   882  4923
CDD            0     0     4    11    60   203   345   302   132    15     3     0  1075
City:WASHINGTON REAGAN NATIONAL AP
State:VA
Lat:38.52N
Long:077.02W
Elev:   10
ID:448906
Normal      Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec  Annual
Minimum     27.3  29.7  37.3  45.9  55.8  65.0  70.1  68.6  61.8  49.6  40.0  32.0  48.6
Maximum     42.5  46.5  55.7  66.3  75.4  83.9  88.3  86.3  79.3  68.0  57.3  47.0  66.4
Mean        34.9  38.1  46.5  56.1  65.6  74.5  79.2  77.4  70.5  58.8  48.7  39.5  57.5
Precip.     3.21  2.63  3.60  2.77  3.82  3.13  3.66  3.44  3.79  3.22  3.03  3.05 39.35
HDD          906   741   562   269    72     5     0     1    19   202   467   755  3999
CDD            0     0     4    21   108   307   464   410   210    32     4     0  1560

 

 

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