The Calumet news. [volume] (Calumet, Mich.) 1907-1938, 1911-03-27
MONTHLY CHART
OF GREAT LAKES
APRIL D is AVERAGE DATE or
OPENING OF NAVIGATION AT
HoUeHToN BY WEATHER
BUREAU

Weather Observer Cowdrick of
Houghton will on Thursday of this
week place the monthly meteorological
map of the great lakes i'm various pub
lie places in 4 oughton and Hancock
Besides the usual information con-
tanned in the maps the chart for April
dweus somewhat on the opening of
navigation. The average date of the
opening of navigation at Houghton for
period of seventeen years is April 22
For purposes of comparison, the fol-
lowing dates on which navigation
opened during April. and the number
OF years Of record, are given, having
been compiled with much labor:
Lake Superior: Ashland. on 2Srd, "A
years: Duluth. on 22nd 80 years: Ea-
gle Harbor, on cath, % years; Grand
Marais Harbor. on 26th, p years;
Houghton. on 22d, II years; Ontona-
gon. on 18th, 26 years; Sault Ste
Marie on 2Sth. SO years; Two Harbors
on oath, 25 years; and Whitefsh Point
on 25th 81 years.
Lake Erie: Buffalo, on 18th, 40 years;
Erie, on the 9th. II years.
Lake Huron: Alpena, on 4th. 81
years: Cheboygan. on 18th, years;
Detour on 18th. years; Oscoda. on
18th II years; and Port Huron, on 9Th
"a years.
Lake Michigan: Escanaba, on 18th.
Al years; Green Bay, on 18th. SO years
(record of Grassy Island Light House,
three miles north Of the station in
Green Bay. used in obtaining this av-
erage from 1S74-1SS6); Harbor
Springs, on 14th. "A years; Michigan
City. on I'd, IA years; Saugatuok on
9th. % years; and Straits of Mackinac
on 18th. 55 years.
The usual information in regard to
the average conditions of wind and
weather over the great lakes during
April follows:
During the period. 190O-191O. the
coolest April on the Great Lakes oc-
CURED in 1907. on the upper Lakes the
average monthly mean temperature,
1913 deg, was sc deg. lower than the
normal; and on the lower Lakes the
average monthly mean. 1913 deg. was
"a deg. lower than the normal.
The warmest April during the last II
years occurred in 1910. on the upper
Lakes the average monthly mean tenn
perature. 451 deg. was Al deg higher
than the normal; and on the lower
Lakes the average mean temperature
4S.7 deg, was 40 deg. higher than the
normal
The lowest temperature ever record
ed during this month at Weather Blu
reau stations is as follows:
Lake Superior: Duluth deg, 4th,
1874. and tst. 1881; Houghton. II deg,
LIST, 1907; Marquette. 3 deg. 10th. 1875;
and Sault Ste. Marie, deg, LIST. 1890.
The area Of highest average temper
allure for the Great Lakes, As deg, ex-
tends over the central part Of Lake
Erie, and the southern part Of Lake
Michigan north of the aga parallel of
latitude That for the lowest average
temperature, IS deg. extends over the
northern part of Lake Superior, north
Of Pie Island, Isle Royale. Michipicoten
Island, and Cape Gargantua.
The area of mean average tempera-
ture. 40 deg. extends south Of Oconto,
over Green Bay and Lake Huron, south
Of Saugeen, and over Nottawassaga
Bay to the 45th parallel Of latitude.
Precipitation greatest prccipi-
tation on the Great Lakes I'm any April,
during the period, 19O0-19tO, occurred
in 1909. on the upper Lakes the av-
erage total precipitation. Az inches
was 2.7 inches more than the normal;
and on the lower Lakes the average
total amount, 3.64 inches. was 10
inches more than the normal
The least precipitation over this re-
gion in any April during the last II
years. occurred in 1900 ON the upper
Lakes the average total precipitation
1865 inches, was 0.6 inch less than the
normal; and on the lower Lakes the
average total amount 1.6S inches. was
o. inch less than the normal.
The largest amount Of snowfall. i'm
inches Cunmelted). in any April. dur
ing the last IL years, occurred in 1909
as follows:
Lake Superior: Duluth. 1876. Hough-
ton. ia: Marquette 276. Port Ar
thur. 80: Sault Ste Marie, 90. and
White River 80.
The greatest amount Of cloudiness IN
any April. during the period, 1900
1910, occurred In 1909 on the upper
Lakes the sky was covered IS per cent
Of the time; on the lower Lakes Sc per
cent OF the time. The least amount OF
cloudiness occurred in 1906. on the
upper Lakes the sky was covered 81
per cent of the time. and on the lower
Lakes. 40 per cent Of the time
Winds-The prevailing direction Of
the wind. with it's percentage Of occur
renee in April. during the period, 1900
1903. Is as follows.
Lake Superior: Ashland, Ne &c;
Baraga. y. %; Duluth, NE. IS: Ea-
gle Harbor. w 20; Grand Marais Har-
Dor. NV 21; Houghton. NV. IA Mar
auette. NV. 30. Port Arthur. NV. %;
sault ste. Marie r. Il: Two Harbors
NE. As: whitehsh Point. NV "a: and