30 Twenty-fifth Annual Report of the Regidrar-General of 58*5°, the extreme temperatures being—highest, 72*4°, on Tuesday; lowest, 46*5°, on Saturday.
Ram fell on five days to the amount of 1*248 inches.
Of this large quantity, '951 of an inch was credited to Wednesday.
The rainfall in Dublin during the six months ending June 30th amounted to 12*113 inches on 87 days, compared with_6741 inches on 67 days during the same period in 1887, and a twenty-three years' average of 12*399 inches, on 95*7 days.
At Greystones, County Wicklow, the rainfall in June, 1888, was 4*18 inches, distributed over 15 days.
Of this quantity, *96 inch fell on the 5th, -89 inch on the 11th, -79 inch on the 27th, and -67 inch on the 7th.
From January 1 to the end of June, 14*91 inches of rain fell at Greystones, on, however only 63 days.
'
July.—A
wet, cloudy, cold month—almost as wet and cold as July, 1879, with which phenomenal month that now under review had many features in common.
It is to be noted that, whereas July of 1887 was cold and wet in Scandinavia, very fine and hot in the British Isles and Central Europe, just the reverse held good as regards July, 1888, which was favourable in Northern Europe.
The' cold weather of the 10th and 11th was, perhaps, without a parallel.
In Dublin the mean temperature (57*3°) was much below the average (60*8°); the mean dry bulb readings at 9 a.m.
and 9 p.m.
were 56-6°.
In the twenty-three years ending with 1887, July was coldest in 1879 (the " cold year ") (M.
T.
= 57-2°).
It was warmest in 1887 (M.
T.
= 63-7°), and in 1808 (the "
warm year") (M.
T.=63-5°).
In 1886, the M.
T.
was 61-0°.
From this, 1887 proves to have been the warmest since the present records commenced, whilst July, 1888, was almost the coldest.
The mean height of the barometer was 29*747 inches, or 0*175 inch below the average value for July—namely, 29*922 inches.
The mercury marked 30*178 inches at 9 p.m.
of the 12th, and fell to 29 "200 inches at 7 p.m.
of the 2nd.
The observed range of atmospherical pressure was, therefore, 0*97S inch—that is—a little less than an inch.
The mean temperature deduced from daily readings of the dry bulb thermometer at 9 a.m.
and 9 p.m.
was 56-6°, or 0*5° above the value for June, 1888; that calculated by Kaemtz's formula from the means of the daily maxima and minima was 56-3°, or 3*3 below the average mean temperature for July, calculated in the same way, in the twenty years, 1865-84, inclusive (59*6°).
The arithmetical mean of the maximal and minimal readingswas 57*3°, compared with a twenty-three years average of 00*8°.
On the 21st the thermometer in the screen rose to 68*7°—wind S.W.;
on the 11th the temperature fell to 42*9°—wind N.N.W.
The minimum on the grass was 36*4° on the latter date.
The rainfall was as much as 3*881 inches, distributed over 22 days.
The average rainfall for July in the twenty-three years, 1865-87, inclusive, was 2*350 inches, and the average number of rainy days was 17*1.
The rainfall and the n iny days, therefore, were decidedly above the average.
In 1880,therainallin July was very large—6*087 inches on 24 days; in 1871 also 4*391 inches fell on 28 clays.
On the other hand, in 1870, only *539 of an inch was measured on 8 days; in 1869 the fall was only 739 of an inch on 9 days, and in 1868 only 741 of an inch fell on but 5 days.
A solar halo appeared on the 1st.
High "winds were noted on 8 days, but attained the force of a gale on only one occasion—viz.,
the 2nd.
In July, 1887, temperature reached or exceeded 70° in the screen on no fewer than 17 days.
In July, 1888, the maximum was 68*7°.
There was a storm of thunder, lightning, and heavy rain on the 31st.
Thunder was heard on the 4th, and lightning was seen on the evening of the 10th.
Although the month opened with a fair promise, the weather soon fell into a changeable, rainy and stormy condition.
This lasted for several days, but from Thursday, the 5th, cool N.E.
winds and finer weather prevailed in Scotland and Ireland, while it remained dull and cold in England.
On the forenoon of Sunday, the 1st, long sprays of cirrus cloud, in which a solar halo appeared, crossed the sky in rapid motion from N.W.
to S.E.
As the day wore on, cloud increased and in the evening rain fell.
Monday was wet, and a fresh W.
gale sprang up in the evening.
The next two days were showry.
Thunder was heard'on Wednesday forenoon, and the same evening luminous cirriform clouds showed on the Northern horizon.
Thursday was fine in Ireland, thundery in England.
At night a sea fog came in along the Dublin and Wicklow coasts.
During the last two days of the week a cool N.E.
wind, and dry, sometimes bright, weather prevailed.
In Dublin the mean height of the barometer was 29 664 inches—pressure ranging between 29*200 inches at 7 p.m.
of Monday, and 30 086 inches at 9 a.m.
of Saturday, The mean temperature, deduced from readings of the dry bulb thermometer, taken daily at 9 a.m.
and 0 p.m.,
was 56*8°, or 4° degrees below the average for the time of year.
The highest shade tempeiature was 67'9° on Monday; the lowest was 46*5 on Sunday.
Rain fell on four days to the amount of 1*063 inches, of which -463 inches was registered on Sunday night.
The second week (Sth-14th) was memorable for a "cold spell,";which is, perhaps, without a parallel in July.
It occurred in connection with a complex system of low atmospherical pressure which travelled slowly from the Noith of Scotland to the Baltic between Monday and Friday.
In connection with this system, a subsidiary depression travelled quickly from N.N.W.
to S.S.E.
across Great Britain on Tuesday and Wednesday, causing squally N.W.
to N.
winds and heavy falls of cold rain, hail, and even snow.
At 8 a.m.
of Wednesday the thermometer stood at 44° in London, and the highest temperature there during the day was 53°.
In Dublin, heavy cold showers fell on Tuesday evening, and at 9 p.m.
the temperature was only 461°.
From Thursday the air was warmer, but conditions were at no time settled during the week.
In Dublin the mean height of the barometer was 30*047 inches, pressure ranging between 30-178 inches at 9 p.m.
of Thursday and 29*893 inches at 9 a.m.
of Monday.
The mean dry bulb temperature, from observations taken at 9 a.m.
and 9 p.m.
daily, was 56*3°.
On Friday the thermometer in the screen rose to 68*4°, on Wednesday it fell to 42-9°.
Rain was registered on two days, the total quantity being -062 inch, of which -049 inch was measured on Tuesday.
Flail and lightning were observed near Dublin on Tuesday evening.
