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Table 28—Mean Altitude, in Feet of Clouds at Different Latitudes
Summer
Station	Ci	Ci-St	Ci-Cu	A-St	A-Cu	St-Cu	Nb	Cu top	Cu base	Cu-Nb top	St
Bossekop, 70° N	27,000	22,000	17,500	15,000	11,500	4,500	3,200	7,100	4,300	13,000	2,200
Pavlovsk, 60° N	28,900	26,600	15,000	······	10,000	6,100	······	7,900	5,400	15,400	2,760
Upsala, 60° N	27,000	20,000	21,000	9,100	13,000	5,800	3,900	6,600	4,700	13,000	······
Potsdam, 52° N	29,000	26,000	19,000	10,800	12,000	7,100	5,900	6,900	4,700	13,100	2,230
Trappe, 49° N	29,200	25,600	19,000	12,500	12,000	5,970	3,500	7,100	······	18,000	3,100
Toronto, 44° N	35,800	29,200	29,100	13,900	11,500	6,760	······	······	······	······	······
Blue Hill, 42° N	31,200	33,100	22,000	20,400	12,300	3,800	3,900	9,500	5,800	29,500	1,670
Washington, 39° N	33,800	34,800	29,900	19,000	16,400	9,400	6,300	8,000	3,900	16,300	2,760
Allahabad, 25° N	35,100	······	37,000	······	14,700	······	2,700	······	······	······	······
Manilla, 15° N	36,100	42,500	22,300	14,000	18,700	6,200	4,500	······	······	21,000	3,500
Batavia	37,800	34,500	20,700	······	17,800	······	······	······	······	······	2,300
Winter
Pavlovsk	25,300	23,300	19,600	······	10,400	4,900	······	5,200	3,700	······	3,300
Upsala	22,900	17,700	20,000	13,400	13,600	6,400	3,200	5,000	2,300	17,000	1,600
Potsdam	26,500	25,000	17,700	9,800	11,000	4,700	4,200	5,700	3,200	3,200	2,000
Trappe	27,900	19,100	18,400	12,500	14,000	5,300	3,400	7,800	······	12,600	······
Toronto	32,800	27,900	26,900	13,700	8,200	5,000	······	······	······	······	······
Blue Hill	28,200	29,200	20,200	15,000	12,000	5,200	2,200	5,300	5,000	······	2,000
Washington	31,200	31,300	24,300	15,700	12,500	7,800	5,900	7,500	3,900	12,200	3,700
Manilla	34,800	38,300	21,000	12,500	15,200	7,600	4,900	······	······	10,300	······