84 ALLISON — ON THE METEOEOLOGfY OF HALIFAX. 



October was decidedly a warm month, with a mean temperature 

 48^.14. The mean pressure was 29.825.005higher than Jasnuary, — 

 and the highest monthly mean in 1870. Elastic force of vapour 

 .294, and relative humidity 82.8. There was still a want of cloud, 

 though October is frequently a bright month in Nova Scotia. In 

 wind there was an evident increase of average force, the mean ve- 

 locity being 12.45 miles per hour, with a resultant direction north 

 42^ west. The rain fall was heavy, and more than twenty five per 

 cent above the average, though coming on few days ; .8 of inch of 

 snow fell j we had no fog except for half an hour early on 31st ; 

 three auroras were marked, hoar frost on 7tb and 24, three lunar 

 halos, hail on 26th, and a rainbow same day ; there were three 

 gales from N. W., S. S. W., an<i S. ; first frost 26th, the atmos- 

 phere having been above 32*^ one hundred and fifty five days, since 

 May 24th; first snow 29th, first measurable snow 31st. 



Mean temperature of November still remained above the aver- 

 age, while the whole pressure of the atmosphere was small, and 

 fell much from that of October. This pressure was composed 

 largely of force of vapour. November, generally a cloudy month, 

 was rather less so than usual this year. The resultant direction of 

 wind was nearly due west, being north 87° west, and the mean 

 velocity in miles per hour receded nearly to that of September — 

 10.75 per hour. Rain fell to a depth of 5.67 inches, which is just 

 one inch above the average ; and 7.7 inches of snow fell, which is 

 almost double the usual amount. There were three fogs, &ve au- 

 roras, two hoar frosts, three lunar halos, and a corona ; three gales 

 Avere felt from N. W., S. S.E., and S. E. ; meteors night of 14th. 



The winter began very mildly ; December having a mean of ex- 

 actly 30° or 3°. 61 over the average temperature. In this mild month 

 pressure was naturally very low, force of vapour and relative hu- 

 midity comparatively high. The mean clouding was large, and 

 considerably more than any other month in the year. Winds were 

 not strong on the whole, the mean velocity being ll.G miles per 

 hour, resultant direction north 76° west. Rain was much above 

 the average, and snow below, though the latter contained more 

 water than is usual ; so that the total precipitation was large. But 

 one fog was present, three auroras, seven times hoar frost, four 



