[431] Observations were taken by Mr. Muller.
NOVEMBER AND DECEMBER, 1848
| DORJILING | CALCUTTA | ||||||||||
| No. of Obs. | Place | Elev. (feet) | Hour | Temp. | Dew Point | Diff. | Tens. | Temp. | Dew Point | Diff. | Tens. |
| 4 8 6 9 19 | The Dale[[432]] Nov./Dec. … December … | 6952 … … … … | 6 a.m. 2 p.m. 6 p.m. 2 p.m. 6 a.m. | 45·6 60·0 50·6 49·7 44·0 | 41·4 48·3 44·7 41·7 40·5 | 4·2 11·7 5·9 8·0 3·5 | ·277 ·355 ·311 ·280 ·269 | 67·9 83·3 77·3 79·3 75·8 | 64·7 65·2 63·1 59·0 62·6 | 3·2 18·1 14·2 20·3 13·2 | ·610 ·621 ·579 ·505 ·569 |
| 46 | … | … | Mean | 49·9 | 43·3 | 6·7 | ·298 | 76·7 | 62·9 | 13·8 | ·577 |
| Dorjiling | Calcutta | |
| Humidity Vapour in cubic foot of atmosphere | 0·798 3·40 gr. | 0·640 6·27 gr. |
[432] Observations were taken by Mr. Muller.
Comparison of Dorjiling and Calcutta.
| HUMIDITY | WEIGHT OFVAPOUR IN CUBIC FOOT OF AIR | ||||||
| No. of Obs. | Month | Dorjiling | Calcutta | Diff. Dorjiling | Dorjiling | Calcutta | Diff. Calcutta |
| 102 97 40 23 48 40 176 167 185 74 46 | January February March April May June July August September October Nov. and Dec. | –·795 ·828 ·940 ·684 ·926 ·895 ·929 +·955 ·932 ·950 ·798 | ·572 ·590 –·438 ·523 ·698 ·800 ·800 +·818 ·760 ·658 ·640 | +·224 +·238 +·502 +·161 +·228 +·095 +·129 +·136 +·172 +·292 +·158 | –2·68 2·75 3·42 3·98 5·22 5·39 6·06 +6·25 5·72 4·74 6·27 | –4.80 5·40 5·72 7·65 9·90 10·17 10·05 +10·35 9·88 8·55 6·27 | +2·12 +2·65 +2·30 +3·67 +4·62 +4·78 +3·99 +4·10 +4·16 +3·81 +2·87 |
| 998 | Mean | 0·876 | 0·663 | +·212 | 4·51 | 8·07 | +3·55 |
It is hence evident, from nearly 1000 comparative observations, that the atmosphere is relatively more humid at Dorjiling than at Calcutta, throughout the year. As the southerly current, to which alone is due all the moisture of Sikkim, traverses 200 miles of land, and discharges from sixty to eighty inches of rain before arriving at Dorjiling, it follows that the whole atmospheric column is relatively drier over the Himalaya than over Calcutta; that the absolute amount of vapour, in short, is less than it would otherwise be at the elevation of Dorjiling, though the relative humidity is so great. A glance at the table at the end of this section appears to confirm this; for it is there shown that, at the base of the Himalaya, at an elevation of only 250 feet higher than Calcutta, the absolute amount of vapour is less, and of relative humidity greater, than at Calcutta.
SERIES II. Observations at various Stations and Elevations in the Himalaya of East Nepal and Sikkim.
ELEVATION 735 TO 2000 FEET
| EAST NEPAL ANDSIKKIM | CALCUTTA | ||||||||||
| No. of Obs. | Locality | Elev. | Month | Temp. | Dew Point | Diff. | Tens. | Temp. | Dew Point | Diff. | Tens. |
| 3 2 1 3 1 6 1 5 5 11 10 | Katong Ghat, Teesta river Great Rungeet, at bridge Ditto Tambur river, E. Nepal Ditto Bhomsong, Teesta river Ditto Little Rungeet Pemiongchi, Great Rungeet Punkabaree Ditto Guard house (Gt. Rungeet) | 735 818 818 1388 1457 1596 1596 1672 1840 1850 1850 1864 | Dec. April May Nov. Nov. Dec. May Jan. Dec. March May April | 60·2 82·8 77·8 60·6 64·2 58·6 68·2 51·0 54·6 70·1 73·5 73·7 | 55·3 63·5 60·3 57·0 59·1 52·0 66·4 50·2 53·7 55·6 68·3 63·8 | 4·9 19·3 17·5 3·6 5·1 6·6 1·8 0·8 0·9 14·5 5·2 9·9 | ·447 ·588 ·528 ·473 ·507 ·399 ·647 ·377 ·424 ·472 ·687 ·592 | 73·2 95·8 91·7 73·3 77·3 71·6 82·6 58·5 73·5 79·2 83·7 92·4 | 56·7 61·9 78·3 62·7 63·4 57·0 77·4 58·0 66·2 62·6 77·9 67·0 | 16·5 33·9 13·4 10·6 13·9 14·6 5·2 0·5 7·3 16·6 5·8 25·4 | ·468 ·557 ·947 ·571 ·585 ·474 ·923 ·489 ·642 ·570 ·938 ·660 |
| 48 | Mean | 66·3 | 58·8 | 7·5 | ·512 | 79·4 | 65·8 | 13·6 | ·652 | ||