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Climatography of the United States NO. 84, 1971-2000

Daily Normals of

Temperature, Precipitation, and Heating and Cooling Degree Days

(includes monthly tables for precipitation probability and quintiles)
 Station Name, State:BOSTON LOGAN INTL AP, MA  Station Number:190770
 Latitude:42°21'  Longitude:-71°00'  Elevation:12ft Climate Division:03
December
DATE MAX MIN AVG HDD CDD PRCP
1 46 33 40 25 0 0.13
2 46 32 39 26 0 0.12
3 46 32 39 26 0 0.12
4 45 32 39 26 0 0.12
5 45 31 38 27 0 0.12
6 45 31 38 27 0 0.12
7 44 30 37 28 0 0.12
8 44 30 37 28 0 0.12
9 44 30 37 28 0 0.12
10 43 29 36 29 0 0.12
11 43 29 36 29 0 0.12
12 43 29 36 29 0 0.12
13 42 29 35 29 0 0.12
14 42 28 35 30 0 0.12
15 42 28 35 30 0 0.12
16 41 28 35 30 0 0.12
17 41 27 34 31 0 0.12
18 41 27 34 31 0 0.12
19 41 27 34 31 0 0.12
20 40 26 33 31 0 0.12
21 40 26 33 32 0 0.12
22 40 26 33 32 0 0.12
23 40 26 33 32 0 0.12
24 39 25 32 32 0 0.12
25 39 25 32 33 0 0.12
26 39 25 32 33 0 0.12
27 39 25 32 33 0 0.12
28 39 24 32 33 0 0.12
29 38 24 31 33 0 0.12
30 38 24 31 34 0 0.12
31 38 24 31 34 0 0.12
MNTH: 41.7 27.8 34.8 932 0 3.73
January
DATE MAX MIN AVG HDD CDD PRCP
1 38 24 31 34 0 0.12
2 38 23 30 34 0 0.12
3 38 23 30 35 0 0.12
4 37 23 30 35 0 0.12
5 37 23 30 35 0 0.12
6 37 23 30 35 0 0.13
7 37 22 30 35 0 0.13
8 37 22 30 35 0 0.13
9 37 22 29 35 0 0.13
10 37 22 29 35 0 0.13
11 37 22 29 36 0 0.13
12 36 22 29 36 0 0.13
13 36 22 29 36 0 0.13
14 36 22 29 36 0 0.13
15 36 22 29 36 0 0.13
16 36 22 29 36 0 0.13
17 36 22 29 36 0 0.13
18 36 22 29 36 0 0.13
19 36 22 29 36 0 0.13
20 36 21 29 36 0 0.13
21 36 21 29 36 0 0.13
22 36 21 29 36 0 0.13
23 36 21 29 36 0 0.13
24 36 22 29 36 0 0.13
25 36 22 29 36 0 0.13
26 36 22 29 36 0 0.12
27 36 22 29 36 0 0.12
28 36 22 29 36 0 0.12
29 36 22 29 36 0 0.12
30 36 22 29 36 0 0.12
31 37 22 29 36 0 0.12
MNTH: 36.5 22.1 29.3 1104 0 3.92
Winter 39.0 24.7 31.9 2987 0 10.95
Annual 59.3 43.9 51.6 5630 777 42.53
February
DATE MAX MIN AVG HDD CDD PRCP
1 37 22 29 36 0 0.12
2 37 22 29 36 0 0.12
3 37 22 30 36 0 0.12
4 37 22 30 36 0 0.12
5 37 23 30 36 0 0.12
6 37 23 30 35 0 0.12
7 37 23 30 35 0 0.12
8 37 23 30 35 0 0.12
9 38 23 30 35 0 0.12
10 38 23 31 35 0 0.12
11 38 23 31 35 0 0.12
12 38 24 31 35 0 0.12
13 38 24 31 34 0 0.12
14 38 24 31 34 0 0.11
15 39 24 31 34 0 0.11
16 39 24 32 34 0 0.11
17 39 24 32 34 0 0.11
18 39 25 32 34 0 0.11
19 39 25 32 33 0 0.11
20 40 25 32 33 0 0.12
21 40 25 33 33 0 0.12
22 40 26 33 33 0 0.12
23 40 26 33 32 0 0.12
24 40 26 33 32 0 0.12
25 41 26 34 32 0 0.12
26 41 27 34 32 0 0.12
27 41 27 34 31 0 0.12
28 42 27 34 31 0 0.12
 
 
 
MNTH: 38.7 24.2 31.5 951 0 3.30
 


Normals logo image

Climatography of the United States NO. 84, 1971-2000

Daily Normals of

Temperature, Precipitation, and Heating and Cooling Degree Days

(includes monthly tables for precipitation probability and quintiles)
 Station Name, State:BOSTON LOGAN INTL AP, MA  Station Number:190770
 Latitude:42°21'  Longitude:-71°00'  Elevation:12ft Climate Division:03
March
DATE MAX MIN AVG HDD CDD PRCP
1 42 27 35 31 0 0.12
2 42 28 35 30 0 0.12
3 42 28 35 30 0 0.12
4 43 28 35 30 0 0.12
5 43 28 36 30 0 0.12
6 43 29 36 29 0 0.12
7 44 29 36 29 0 0.12
8 44 29 37 29 0 0.12
9 44 30 37 28 0 0.12
10 44 30 37 28 0 0.12
11 45 30 37 28 0 0.12
12 45 30 38 28 0 0.12
13 45 31 38 27 0 0.12
14 46 31 38 27 0 0.12
15 46 31 39 27 0 0.12
16 46 31 39 26 0 0.12
17 47 32 39 26 0 0.12
18 47 32 39 26 0 0.12
19 47 32 40 25 0 0.13
20 47 33 40 25 0 0.13
21 48 33 40 25 0 0.13
22 48 33 41 24 0 0.13
23 48 33 41 24 0 0.13
24 49 34 41 24 0 0.13
25 49 34 42 24 0 0.13
26 49 34 42 23 0 0.13
27 50 35 42 23 0 0.13
28 50 35 42 23 0 0.13
29 50 35 43 22 0 0.13
30 51 35 43 22 0 0.13
31 51 36 43 22 ** 0.13
MNTH: 46.3 31.5 38.9 815 1 3.85
April
DATE MAX MIN AVG HDD CDD PRCP
1 51 36 44 21 0 0.13
2 52 36 44 21 0 0.13
3 52 37 44 21 0 0.13
4 52 37 45 20 0 0.13
5 53 37 45 20 0 0.13
6 53 38 45 20 0 0.12
7 53 38 46 20 0 0.12
8 53 38 46 19 0 0.12
9 54 38 46 19 0 0.12
10 54 39 47 19 0 0.12
11 54 39 47 18 0 0.12
12 55 39 47 18 0 0.12
13 55 40 47 18 0 0.12
14 56 40 48 17 0 0.12
15 56 40 48 17 0 0.12
16 56 41 48 17 0 0.12
17 57 41 49 16 0 0.12
18 57 41 49 16 0 0.12
19 57 42 49 16 0 0.12
20 58 42 50 15 0 0.12
21 58 42 50 15 0 0.12
22 58 43 50 15 0 0.12
23 59 43 51 14 0 0.12
24 59 43 51 14 0 0.12
25 59 43 51 14 0 0.12
26 60 44 52 13 0 0.11
27 60 44 52 13 ** 0.11
28 60 44 52 13 ** 0.11
29 61 45 53 12 ** 0.11
30 61 45 53 12 ** 0.11
 
MNTH: 56.1 40.5 48.3 503 4 3.60
Spring 56.4 40.7 48.6 1551 37 10.69
Annual 59.3 43.9 51.6 5630 777 42.53
May
DATE MAX MIN AVG HDD CDD PRCP
1 61 45 53 12 0 0.11
2 62 46 54 11 0 0.11
3 62 46 54 11 0 0.11
4 63 46 54 11 0 0.11
5 63 47 55 11 0 0.11
6 63 47 55 10 0 0.11
7 64 47 55 10 0 0.11
8 64 48 56 10 1 0.11
9 64 48 56 9 1 0.11
10 65 48 57 9 1 0.11
11 65 49 57 9 1 0.11
12 65 49 57 8 1 0.10
13 66 49 58 8 1 0.10
14 66 50 58 8 1 0.10
15 66 50 58 8 1 0.10
16 67 50 59 7 1 0.10
17 67 51 59 7 1 0.10
18 67 51 59 7 1 0.10
19 68 51 60 7 1 0.10
20 68 51 60 6 1 0.10
21 68 52 60 6 1 0.10
22 69 52 61 6 1 0.10
23 69 52 61 6 1 0.10
24 69 53 61 5 2 0.10
25 70 53 62 5 2 0.10
26 70 53 62 5 2 0.10
27 71 54 62 5 2 0.10
28 71 54 62 4 2 0.10
29 71 54 63 4 2 0.11
30 72 55 63 4 2 0.11
31 72 55 63 4 2 0.11
MNTH: 66.7 50.2 58.5 233 32 3.24
 


Normals logo image

Climatography of the United States NO. 84, 1971-2000

Daily Normals of

Temperature, Precipitation, and Heating and Cooling Degree Days

(includes monthly tables for precipitation probability and quintiles)
 Station Name, State:BOSTON LOGAN INTL AP, MA  Station Number:190770
 Latitude:42°21'  Longitude:-71°00'  Elevation:12ft Climate Division:03
June
DATE MAX MIN AVG HDD CDD PRCP
1 72 55 64 4 2 0.10
2 73 56 64 3 3 0.10
3 73 56 64 3 3 0.11
4 73 56 65 3 3 0.11
5 74 57 65 3 3 0.11
6 74 57 65 3 3 0.11
7 74 57 66 3 3 0.11
8 75 57 66 2 3 0.11
9 75 58 66 2 4 0.11
10 75 58 67 2 4 0.11
11 75 58 67 2 4 0.11
12 76 59 67 2 4 0.11
13 76 59 67 2 4 0.11
14 76 59 68 2 4 0.11
15 77 59 68 1 4 0.11
16 77 60 68 1 5 0.11
17 77 60 68 1 5 0.11
18 77 60 69 1 5 0.11
19 78 60 69 1 5 0.11
20 78 61 69 1 5 0.11
21 78 61 70 1 5 0.11
22 79 61 70 1 6 0.11
23 79 61 70 1 6 0.11
24 79 62 70 1 6 0.11
25 79 62 71 1 6 0.10
26 79 62 71 1 6 0.10
27 80 62 71 0 7 0.10
28 80 63 71 0 7 0.10
29 80 63 72 0 7 0.10
30 80 63 72 0 7 0.10
 
MNTH: 76.6 59.4 68.0 48 139 3.22
July
DATE MAX MIN AVG HDD CDD PRCP
1 80 64 72 ** 7 0.10
2 81 64 72 ** 8 0.10
3 81 64 72 ** 8 0.10
4 81 64 73 ** 8 0.10
5 81 64 73 0 8 0.10
6 81 65 73 0 8 0.10
7 82 65 73 0 8 0.10
8 82 65 73 0 9 0.10
9 82 65 73 0 9 0.10
10 82 65 74 0 9 0.10
11 82 65 74 0 9 0.10
12 82 65 74 0 9 0.10
13 82 66 74 0 9 0.10
14 82 66 74 0 9 0.10
15 82 66 74 0 9 0.10
16 83 66 74 0 9 0.09
17 83 66 74 0 9 0.09
18 83 66 74 0 9 0.09
19 83 66 74 0 10 0.09
20 83 66 75 0 10 0.10
21 83 66 75 0 10 0.10
22 83 66 75 0 10 0.10
23 83 66 75 0 10 0.10
24 83 66 75 0 10 0.10
25 83 66 75 0 10 0.10
26 83 66 75 0 10 0.10
27 83 67 75 0 10 0.10
28 83 66 75 0 10 0.10
29 82 66 74 0 10 0.10
30 82 66 74 0 9 0.10
31 82 66 74 0 9 0.10
MNTH: 82.2 65.5 73.9 4 282 3.06
Summer 79.6 63.1 71.4 60 656 9.65
Annual 59.3 43.9 51.6 5630 777 42.53
August
DATE MAX MIN AVG HDD CDD PRCP
1 82 66 74 0 9 0.10
2 82 66 74 0 9 0.10
3 82 66 74 0 9 0.10
4 82 66 74 0 9 0.10
5 82 66 74 0 9 0.11
6 82 66 74 0 9 0.11
7 82 66 74 0 9 0.11
8 82 66 74 0 9 0.11
9 81 66 74 0 9 0.11
10 81 66 73 0 9 0.11
11 81 65 73 0 8 0.11
12 81 65 73 0 8 0.11
13 81 65 73 0 8 0.11
14 81 65 73 0 8 0.11
15 80 65 73 0 8 0.11
16 80 65 73 0 8 0.11
17 80 65 72 0 8 0.11
18 80 64 72 0 7 0.11
19 80 64 72 0 7 0.11
20 80 64 72 0 7 0.11
21 79 64 72 0 7 0.11
22 79 64 71 0 7 0.11
23 79 64 71 0 7 0.11
24 79 63 71 1 7 0.11
25 79 63 71 1 6 0.11
26 78 63 71 1 6 0.11
27 78 63 70 1 6 0.11
28 78 62 70 1 6 0.11
29 78 62 70 1 6 0.11
30 77 62 70 1 5 0.11
31 77 62 69 1 5 0.11
MNTH: 80.1 64.5 72.3 8 235 3.37
 


Normals logo image

Climatography of the United States NO. 84, 1971-2000

Daily Normals of

Temperature, Precipitation, and Heating and Cooling Degree Days

(includes monthly tables for precipitation probability and quintiles)
 Station Name, State:BOSTON LOGAN INTL AP, MA  Station Number:190770
 Latitude:42°21'  Longitude:-71°00'  Elevation:12ft Climate Division:03
September
DATE MAX MIN AVG HDD CDD PRCP
1 77 61 69 1 5 0.11
2 77 61 69 1 5 0.11
3 76 61 69 1 4 0.11
4 76 61 68 1 4 0.11
5 76 60 68 1 4 0.11
6 76 60 68 1 4 0.11
7 75 60 67 1 4 0.11
8 75 59 67 1 4 0.11
9 75 59 67 1 3 0.11
10 74 59 67 2 3 0.11
11 74 58 66 2 3 0.11
12 74 58 66 2 3 0.11
13 73 58 66 2 3 0.11
14 73 57 65 2 3 0.12
15 73 57 65 2 2 0.12
16 72 57 65 3 2 0.12
17 72 56 64 3 2 0.12
18 72 56 64 3 2 0.12
19 72 56 64 3 2 0.12
20 71 55 63 3 2 0.12
21 71 55 63 4 2 0.12
22 70 55 63 4 2 0.12
23 70 54 62 4 1 0.12
24 70 54 62 4 1 0.12
25 69 54 62 5 1 0.12
26 69 53 61 5 1 0.12
27 69 53 61 5 1 0.12
28 68 53 60 5 1 0.12
29 68 52 60 6 1 0.12
30 68 52 60 6 1 0.12
 
MNTH: 72.5 56.8 64.7 84 76 3.47
October
DATE MAX MIN AVG HDD CDD PRCP
1 67 51 59 6 1 0.12
2 67 51 59 7 1 0.12
3 66 51 58 7 1 0.12
4 66 50 58 7 1 0.12
5 66 50 58 8 1 0.12
6 65 50 57 8 1 0.12
7 65 49 57 8 1 0.12
8 65 49 57 9 0 0.12
9 64 48 56 9 0 0.12
10 64 48 56 9 0 0.12
11 63 48 56 10 0 0.12
12 63 47 55 10 0 0.12
13 63 47 55 10 0 0.12
14 62 47 55 11 0 0.12
15 62 47 54 11 0 0.12
16 62 46 54 11 0 0.12
17 61 46 54 12 0 0.12
18 61 46 53 12 0 0.12
19 61 45 53 12 0 0.12
20 60 45 53 12 0 0.12
21 60 45 52 13 0 0.12
22 60 44 52 13 0 0.12
23 59 44 52 13 0 0.12
24 59 44 51 14 0 0.12
25 59 44 51 14 0 0.13
26 58 43 51 14 0 0.13
27 58 43 51 14 0 0.13
28 58 43 50 15 0 0.13
29 58 43 50 15 0 0.13
30 57 42 50 15 0 0.13
31 57 42 50 15 0 0.13
MNTH: 61.8 46.4 54.1 344 7 3.79
Autumn 62.0 47.0 54.6 1032 84 11.24
Annual 59.3 43.9 51.6 5630 777 42.53
November
DATE MAX MIN AVG HDD CDD PRCP
1 57 42 49 16 0 0.13
2 56 42 49 16 0 0.13
3 56 41 49 16 0 0.13
4 56 41 48 17 0 0.13
5 55 41 48 17 0 0.13
6 55 41 48 17 0 0.13
7 55 41 48 17 0 0.13
8 54 40 47 18 0 0.13
9 54 40 47 18 0 0.13
10 54 40 47 18 0 0.14
11 53 39 46 19 0 0.14
12 53 39 46 19 0 0.14
13 53 39 46 19 0 0.14
14 52 39 46 20 0 0.14
15 52 38 45 20 0 0.14
16 52 38 45 20 0 0.14
17 51 38 45 20 0 0.14
18 51 37 44 21 0 0.13
19 51 37 44 21 0 0.13
20 50 37 44 21 ** 0.13
21 50 36 43 22 0 0.13
22 50 36 43 22 0 0.13
23 49 36 43 22 0 0.13
24 49 35 42 23 0 0.13
25 49 35 42 23 0 0.13
26 48 35 41 24 0 0.13
27 48 34 41 24 0 0.13
28 47 34 41 24 0 0.13
29 47 33 40 25 0 0.13
30 47 33 40 25 0 0.13
 
MNTH: 51.8 37.9 44.9 604 1 3.98
 


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Climatography of the United States NO. 84, 1971-2000

Precipitation Probability and Quintiles


 Station Name, State:BOSTON LOGAN INTL AP, MA  Station Number:190770
 Latitude:42°21'  Longitude:-71°00'  Elevation:12ft Climate Division:03

Probability that the monthly precipitation will be equal to or less than the indicated amount
Monthly Precipitation (inches)
Probability Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
0.005 0.31 0.50 0.59 0.54 0.40 0.00 0.40 0.26 0.21 0.50 0.45 0.29 26.90
0.010 0.42 0.63 0.73 0.67 0.51 0.00 0.50 0.35 0.30 0.64 0.58 0.40 28.18
0.050 0.87 1.07 1.25 1.15 0.93 0.18 0.90 0.74 0.67 1.13 1.09 0.83 31.88
0.100 1.24 1.38 1.61 1.49 1.24 0.48 1.20 1.05 0.99 1.49 1.47 1.18 33.99
0.200 1.81 1.84 2.15 2.00 1.70 0.98 1.63 1.54 1.50 2.03 2.04 1.72 36.66
0.300 2.33 2.24 2.61 2.43 2.10 1.45 2.01 1.99 1.96 2.50 2.54 2.21 38.67
0.400 2.85 2.62 3.06 2.85 2.50 1.95 2.38 2.44 2.44 2.95 3.04 2.71 40.45
0.500 3.40 3.01 3.51 3.28 2.90 2.51 2.76 2.91 2.95 3.42 3.55 3.23 42.16
0.600 4.02 3.44 4.02 3.75 3.36 3.16 3.18 3.45 3.53 3.94 4.12 3.82 43.92
0.700 4.76 3.94 4.60 4.31 3.89 3.97 3.68 4.09 4.23 4.55 4.79 4.53 45.85
0.800 5.74 4.59 5.36 5.02 4.58 5.06 4.32 4.94 5.15 5.34 5.67 5.46 48.19
0.900 7.29 5.60 6.54 6.13 5.66 6.86 5.32 6.28 6.63 6.57 7.05 6.93 51.55
0.950 8.76 6.53 7.62 7.16 6.67 8.61 6.25 7.56 8.04 7.72 8.33 8.33 54.44
0.990 11.97 8.53 9.95 9.36 8.84 12.57 8.26 10.35 11.16 10.18 11.11 11.38 60.15
0.995 13.31 9.34 10.90 10.26 9.73 14.25 9.09 11.51 12.45 11.19 12.26 12.65 62.33

Precipitation Quintiles (inches)
Level Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
0< 0.61 0.72 0.62 0.83 0.92 0.00 0.63 0.82 0.82 0.41 0.64 0.81
1 0.61 0.72 0.62 0.83 0.92 0.00 0.63 0.82 0.82 0.41 0.64 0.81
1.81 1.84 2.15 2.00 1.70 0.98 1.63 1.54 1.50 2.03 2.04 1.72
2 1.82 1.85 2.16 2.01 1.71 0.99 1.64 1.55 1.51 2.04 2.05 1.73
2.85 2.62 3.06 2.85 2.50 1.95 2.38 2.44 2.44 2.95 3.04 2.71
3 2.86 2.63 3.07 2.86 2.51 1.96 2.39 2.45 2.45 2.96 3.05 2.72
4.02 3.44 4.02 3.75 3.36 3.16 3.18 3.45 3.53 3.94 4.12 3.82
4 4.03 3.45 4.03 3.76 3.37 3.17 3.19 3.46 3.54 3.95 4.13 3.83
5.74 4.59 5.36 5.02 4.58 5.06 4.32 4.94 5.15 5.34 5.67 5.46
5 5.75 4.60 5.37 5.03 4.59 5.07 4.33 4.95 5.16 5.35 5.68 5.47
10.55 7.81 9.72 9.46 8.77 13.20 7.62 7.99 9.86 10.66 8.89 8.26
6> 10.55 7.81 9.72 9.46 8.77 13.20 7.62 7.99 9.86 10.66 8.89 8.26
(These values were determined from the incomplete Gamma Distribution)

 



	       








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