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36
Table 17 gives a record of the principal results from the six stations and also
are not specific to the borough, having been obtained from a publication of the me
Atmospheric Condit
17
January
February
March
April
May
Temperature—
Mean maximum1 °F
44.3
35.8
51.0
52.8
65.8
Mean minimum1 °F
35.5
25.9
37.3
35.5
444
Mean1 °F
39.9
30.9
44.1
44.1
55.2
Diff. from average1 °F
.0.2
.9.5
+0.4
.4.1
+1.5
Highest maximum2 °F
53.0
57.0
65.0
68.0
79.0
Lowest minimum2 °F
29.0
17.0
27.0
33.0
39.0
Rainfall—
Total2 in.
2.92
0.12
0.75
0.94
0.3
Percent of average
194
14
40
78
17
Sunshine'
Daily mean hrs.
1.63
1.72
4.78
4.48
7.8
Percent of average
109
76
126
90
120
Wind1
ne/e/se %
13
34
50
32
11
s/sw/w %
59
18
30
27
52
NW/N/Calm %
28
48
20
41
37
Atmospheric pollution—
West Division :
Water insol. matter tpm
8.95
11.33
7.42
12.23
10.70
Water sol. matter tpm
4.11
10.61
4.51
5.93
3.35
Sulphur †
3.02
3.09
1.86
2.08
1.13
Smoke, daily average
38.0
31.6
16.0
17.7
44
„ maximum *
202.0
52.2
25.4
26.7
9.5
(date)
(4.6)
(4.7)
(14.16)
(18.20)
(30.3)
„ minimum *
18.0
19.3
7.8
12.7
2.4
(date)
(14.17)
(25.29)
(21.23)
(11.13)
(9.1)
(21.24)
North Division4 :
Water insol. matter tpm
17.45
10.94
10.81
15.60
7.8
Water sol. matter tpm
8.49
4.30
5.30
7.02
3.15
Sulphur †
4.35
5.63
3.20
3.61
1.90
Smoke, daily average
34.0
29.8
15.1
16.5
4.7
„ maximum *
176.0
48.1
202
21 8
113
(date)
(4.6)
(4.7)
(17.20)
(18.20)
(30.3)
„ minimum *
16.0
22.0
7.9
12.1
3.2
(date)
(21.24)
(11.14)
(21.23)
(11.13)
(5.8)
South Division5 :
Water insol. matter tpm
7.57
9.55
10.73
10.74
8.73
Water sol. matter tpm
4.88
6.82
5.76
5 53
4.11
Sulphur
2.71
3.39
1.92
1.93
1.11
Smoke, daily average *
24.0
27.7
13.0
12.9
4.0
„ maximum ... *
61 0
44.7
16.5
19.7
5.4
(date)
(4.6)
(4.7)
(17.20)
(18.20)
(1.4)
„ minimum *
15.0
15.7
4.8
7.2
2.4
(date)
(21.24)
(25.29)
(21.23)
(25.27)
(5.8)
Weather summary
Wet
and
changeable
Dry ;
dull ;
very cold
Dry ;
mild ;
sunny
cold ;
dryish ;
Warm
very dry
sunny
Notes : 'Croydon ; 2Lewisham ; 3Valentine Court for smoke, Pool allotments for others ;
tpm : tons per square mile per month ; †as trioxide in mg per 100 sq. cms. per day