318 Meteorological Observations at Hudson, Ohio. 
July 18, 919.2 July 28, 919.5 
19, 91.2 29, 91.7 
26, 90.7 Aug. 23, 90.8 
27, 92 .0 
The greatest heat of 1839, was July 30, 88°.2; and of 1840, 
July 16, 86°.7. The entire range of the thefniétiicter has been 
102°.1. _ 
~ The following table exhibits all the cases in which the ther- 
mometer has been 25° above the dew point, all occurring at 
3 P.M. Thave also given the interval between each of diese 
—_ a the next tment rain. 
a: ON we | $1.8 ere 
age ite me Sg ° fa 
nope trtrr... lie 
. f + 4s & & . 2s 3 Ea 2 
x (=e = bu) 8. 
°° ce ey ° 90 | 9 ; 
1598, March 3 ,} 61.8] 31.0 30.8]in. 8 hs.] 1839, April. 15,| 62.0) 26.0) 56.0 
April 4,| 48.7] 18.0 30.7in 44 « 19,| 68.4) 39.5) 28.9 
5,| 61.3) 34.0 27:3)in 20. « “9811 76.7) 49.4) 97. 
x 28, 57.6) 29.0 28.6in 9 « 26,| 75.2 45.2 30.0)i 
30,| 49.5] 22.7 96 8 in 24 «& 6,| 63.9] 40.3) 25.6): 
Sept. 17,| 77.4) 52.4 25.0in 5 ds.}1840. March 12.) 45.3) 20 0) 25.3|in 
Oct... 5,| 72.4| 47.4 95.0\in 24 ,| 42.0] 12.2 29.8} 
1839, March 6,/ 49.31 21.1 239in 40 « May — 6,|53.5/18.0| 35.5] 
11} 38.2) 10.8 27.4 in 48 12,| 61.4) 30.8, 30.6)i 
April 3,) 73.7|39.8 33.9in 8ds, .- 13,| 67.5} 41.9) 25.6}in 23. 
5,| 81.5) 55.7, 258 in 6 « b 19,| 84.9] 58 0 26.9lin 18 
Me ee ee Re ee 
The greatest difference i is 36°. 0.. It will be observed, that all 
of the above cases, with two ‘exceptions, occurred in the spring 
of the year, and half of them in the month of April... This 
affords the explanation of the remark before made, that “April 
was the driest month of the year. So far as these observations 
afford ground of predicting for the future, they lead to the folk 
lowing conclusions. 
1. When the thermometer rises 25° above the dew point, rail 
will et follow within eight days, . 
Wes Ra ty that rain will follow. within oaraee 
3. The ee that it. will rain in thictensim hours is + 
a It is an even chance that it will rain in twenty-four hous: 
Tee Tt certainly will not rain in less than eight hours.. 
Do these facts indicate any necessary censetta between ex: 
treme dryness at ee air or Se sequel 
