ATMOSPHERIC PRESSURE 
Table 5. Diurnal variation of atmospheric pressure for latitude ranges, Carnegie, 1928-29 





Latitude range, number of days of record, and months involved 

















Ray aae eee on geen | 35°N-25°N | 25°N-15°N, | 15°N-5°N 
mMT | 65°N-55°N | 55 °N-45°N | 45°N-35°N, | “38 days, 32 days, 44 days 
17 days, 40 days, 35 days, May-June May and May and 
duty vey ||P May ;Aue: | May-Sepy ||) “Aug-cOct.°| Aug.-Oct. | “Aug: -Nov. 



h mm mm mm mm mm mm 
0 +0.03 +0.04 +0.04 +0.24 +0.42 +0.31 
1 - 0.07 0.00 - 0.05 +0.23 +0.12 - 0.06 
2 - 0.22 - 0.08 - 0.18 +0.01 -0.13 - 0.44 
3 -0.32 - 0.09 - 0.31 - 0.15 - 0.26 - 0.60 
4 - 0.352 - 0.10 - 0.322 - 0.15 - 0.31 -0.54 
5 - 0.25 0.00 - 0.24 - 0.12 - 0.15 - 0.38 
6 - 0.14 +0.09 - 0.13 +0.03 +0.04 - 0.06 
7 - 0.06 +0.172 - 0.02 +0.19 +0.33 +0.30 
8 +0.08 +0.16 +0.07 +0.39 +0.53 + 0.66 
9 +0.18 +0.11 +0.24 +0.494 +0.61 +0.86 
10 +0.23 +0.14 +0.324 +0.494 +0.664 +0.81 
11 + 0.302 +0.174 + 0.23 +0.36 - +0.47 +0.64 
12 +0.28 +0.12 +0.17 +0.14 +0.13 +0.21 
13 +0.14 - 0.01 +0.12 -0.17 - 0.31 - 0.25 
14 +0.08 - 0.11 +0.06 - 0.42 - 0.67 - 0.64 
15 -0.11 - 0.09 +0.11 - 0.55 - 0.85 - 0.64 
16 - 0.21 - 0.19 -0.11 - 0.642 - 0.902 - 0.902 
17 -0.11 - 0.204 -0.21 - 0.63 - 0.82 - 0.73 
18 - 0.04 - 0.19 - 0.15 - 0.53 -0.59 - 0.41 
19 +0.04 - 0.202 -0.11 - 0.27 - 0.24 - 0.09 
20 +0.06: - 0.05 +0.05 - 0.01 +0.14 +0.28 
21 +0.14 +0.08 +0.17 +0.29 +0.47 +0.58 
22 +0.18 +0.07 +0.16 +0.40 +0.63 +0.69 
23 +0.19 +0.14 +0.11 +0.32 +0.60 +0.60 
Mean 
pressure 758.49 760.10 762.37 761.46 760.85 759.07 
Average 
departure 0.16 0.11 0.15 0.30 0.43 0.50 
Amplitude 0.65 0.37 0.64 1.13 1.56 1.76 
Latitude range, number of days of record, and months involved 
5°N-5°S 15°S-25°S, ° ° ° ° 
LMT 29 days, 33 days 25°S-35 'S, 35 S-45 S, 
2 22 days, 9 days, 
Apr.-May Nov. and Nov. -Jan mee 
Oct.-Nov. : Jan.-Mar. ; 4 7 
h mm mm mm mm mm 
0 +0.27 +0.39 +0.32 +0.17 +0.13 
1 -0.11 - 0.04 -0.11 - 0.07 - 0.08 
2 - 0.44 - 0.38 - 0.48 - 0.33 - 0.28 
3 - 0.56 - 0.54 - 0.66 - 0.54 - 0.362 
4 - 0.49 - 0.51 - 0.64 - 0.49 - 0.32 
5 - 0.27 - 0.31 - 0.44 - 0.26 - 0.27 
6 +0.14 0.00 - 0.12 +0.02 -0.15 
Tf +0.61 + 0.46 +0.31 +0.31 +0.06 
8 +1.09 +0.385 +0.71 +0.38 +0.20 
9 +1.244 +1.012 +0.834 + 0.40 +0.21 
10 +1.15 +0.98 +0.75 + 0.38 +0.20 
Bl +0.81 +0.74 +0.59 + 0.35 +0.312 
12 +0.28 + 0.36 +0.18 + 0.23 +0.29 
13 - 0.28 -0.11 - 0.22 +0.04 +0.18 
14 - 0.28 - 0.57 - 0.53 - 0.16 +0.06 
15 -1.19 - 0.90 - 0.76 - 0.40 - 0.05 
16 - 1.252 - 1.074 - 0.822 -0.574 - 0.14 
Li - 1.08 -1.01 - 0.72 - 0.55 - 0.28 
18 - 0.70 - 0.75 - 0.43 - 0.44 - 0.31 
19 - 0.28 - 0.37 - 0.08 - 0.16 -0.18 
20 +0.20 +0.06 +0.33 +0.09 +0.05 
21 +0.54 +0.41 +0.59 +0.34 +0.23 
22 +0.64 + 0.63 +0.71 +0.452 +0.27 
23 +0.58 +0.64 +0.59 +0.33 +0.20 
Mean 
pressure 758.66 758.47 760.45 765.56 771.09 
Average 
departure 0.63 0.54 0.50 0.30 0.20 
Amplitude 2.49 2.08 1.65 1.02 0.67 


a 
Extreme mean vaiues. 
