DISTRICT OF COLUMBIA
Climate Normals (1981-2010)
other states

Source: National Climatic Data Center

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City: DALECARLIA RSVR
State: MD
Lat: 38.9400
Long: -77.1131
Elev: 150 ft
Normal       Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Annual
Maximum      43.0    47.3    56.2    68.2    76.5    84.9    88.5    86.7    79.8    68.6    57.5    46.4     67.1
Mean         34.2    37.8    45.5    56.2    65.1    74.1    78.3    76.8    69.7    57.8    47.6    37.6     56.8
Minimum      25.4    28.2    34.7    44.1    53.6    63.4    68.1    66.9    59.6    47.1    37.7    28.7     46.6
CDD          <0.5    <0.5       4      26     104     285     412     368     178      29       2    <0.5    1409
HDD           955     763     610     292     102      11    <0.5       2      37     251     524     851    4398
Precip       3.02    3.03       4    3.66    4.44    4.21    4.59    3.86    4.17    3.84    3.62    3.22    45.66
City: NATL ARBORETUM DC
State: MD
Lat: 38.9133
Long: -76.9700
Elev: 50 ft
Normal       Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Annual
Maximum      44.3    48.0    56.4    67.5    76.7    85.6    89.6    88.3    81.1    69.9    59.3    48.2     68.0
Mean         35.5    38.4    46.2    56.4    65.9    75.1    79.6    78.0    70.3    58.5    48.8    39.2     57.7
Minimum      26.7    28.8    36.0    45.3    55.1    64.7    69.6    67.7    59.4    47.0    38.3    30.1     47.5
CDD          <0.5    <0.5       4      25     112     312     452     403     191      30       3       1    1533
HDD           914     745     587     283      84       7    <0.5       1      34     233     489     802    4178
Precip       3.09     2.9    3.72    3.51    4.28    4.08    4.32    3.41    3.76    3.79    3.47     3.2    43.53
Snow          4.6     3.1     0.9     0.0     0.0     0.0     0.0     0.0     0.0     0.0     0.5     1.5     10.6
City: WASHGTN DULLES INTL AP
State: VA
Lat: 38.9408
Long: -77.4636
Elev: 290 ft
Normal       Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Annual
Maximum      42.5    46.4    55.5    66.7    75.1    83.8    87.9    86.6    79.4    68.2    57.5    46.0     66.4
Mean         33.2    36.2    44.2    54.4    63.2    72.4    76.7    75.4    67.9    56.0    46.4    36.6     55.3
Minimum      23.9    26.0    32.9    42.1    51.2    61.0    65.5    64.2    56.3    43.8    35.3    27.1     44.2
CDD             0    <0.5       3      17      72     237     363     324     141      19       2    <0.5    1178
HDD           986     806     647     335     130      15    <0.5       2      56     298     560     882    4717
Precip       2.68    2.74    3.38    3.47    4.55    3.98    3.67    3.53    3.92    3.25    3.41    2.96    41.54
Snow          7.3     7.6     2.8     0.3     0.0     0.0     0.0     0.0     0.0     0.0     0.5     3.5     22.0
City: WASHINGTON REAGAN AP
State: VA
Lat: 38.8483
Long: -77.0342
Elev: 10 ft
Normal       Jan     Feb     Mar     Apr     May     Jun     Jul     Aug     Sep     Oct     Nov     Dec     Annual
Maximum      43.4    47.1    55.9    66.6    75.4    84.2    88.4    86.5    79.5    68.4    57.9    46.8     66.8
Mean         36.0    39.0    46.8    56.8    66.0    75.2    79.8    78.1    71.0    59.5    49.6    39.7     58.2
Minimum      28.6    30.9    37.6    47.0    56.5    66.3    71.1    69.7    62.4    50.6    41.2    32.5     49.6
CDD          <0.5    <0.5       2      24     108     314     457     406     202      34       2    <0.5    1550
HDD           899     728     568     270      79       6    <0.5    <0.5      24     205     466     786    4030
Precip       2.81    2.62    3.48    3.06    3.99    3.78    3.73    2.93    3.72     3.4    3.17    3.05    39.74
Snow          5.6     4.8     1.3     0.0     0.0     0.0     0.0     0.0     0.0     0.0     0.5     2.3     14.5