HIGHEST WIND VELOCITY, DIRECTION, AND DATE FOR EACH MONTH FROM JANUARY 1, 1888.

Less than 0.01. 0.01 to 0.10..

0.11 to 0.25.

0.26 to 0.50.

0.51 to 1.00....

Over 1.00 inch.

Month.

Year.

Greatest...

Date

Year

3.91

30

1888

May..

June

86

May
June........
84 July
86 August

July..
August..

2 May

1 June..

2 July

NUMBER OF FOGGY DAYS AND THUNDER STORMS IN FOURTEEN YEARS.
[Record began January 1, 1887.]

Months.

65

40

46 NW.

47

N. 44 NW. 36 i NW.

a Also on October 3, 1895.

AVERAGE HUMIDITY (PER CENT).
[Record began January 1, 1887.]

63

45

23

4.91
3
1890

Month.

Feb. Mar.

17

65

53

49

Month.

29

24

Veloc- Direc- Day and
ity.
tion.
year.

TOTAL NUMBER OF DAYS WITH PRECIPITATION SINCE JANUARY 1, 1887.

Jan. Feb. Mar. Apr. May June July Aug.

11 68

34

21
16
10

Miles.

10

65

42

Apr.

58

42
19

11

62

52

35

14, 1896 22, 1892 17,1897 27, 1892

A. M. P. M.

14

92

80

93

80

94

82

95 85

A ver

age.

86

86

September..
October..
88 November.
90 December

7

47

25

Months.

September
October
November
December...

4

3

Month.

September......
October...

3

11

3

1

0

0

Month

4

1

0 November

3 December

SW.

May. June. July. Aug. Sept. Oct. Nov. Dec.

Number of

0.20 0.34 0.91 0.88
0.04 0.42 1.18 1.71
0.13 3.06 0.79 2.43

0.94

1.18

0.98

3.72

2.19 2.88 0.88 1.64 1.05 1.55 0.02 0.03
3.91 0.80 0.97
0.30 0.30 1.99 0.44 T.
1.58 0.65 1.71
1.02 1.54 0.36 0.04 0.09
3.72 4.91 2.90 1.37 0.83 0.35 0.06 0.01 0.68 0.41 0.08 2.21
1.96 1.24 2.09 0.76 0.48 0.14 0.24 0.73 0.52 0.99 2.22
0.72 1.27 1.10 1.40 0.14 0.00 0.05 0.63
1.27 2.33 2.73
1.57 2.06 1.18 0.68 0.22 0.00 0.00 0.81 2.12 3.70 2.46
1.05 1.60 1.27 0.52 0.54 0.02 0.04 1.51 1.07 1.19 3.47
2.20 1.77 1.86 0.53 2.24 0.04 0.12 0.07 2.77 0.03 1.32 1.88
1.34
1.31 1.86 2.87 1.36 0.27 0.00 0.60 1.46 0.94 3.04
2.69
1.16 2.48 1.56 0.99 0.25 0.62 0.02 0.08 0.75 1.09 1.54 1.88
0.68 2.14 0.62 1.85 0.86 0.60 T.
0.06 0.80 0.62 1.02 0.80
1.16 3.17 1.60 0.55 1.23 0.36 0.00 0.24 0.74 1.90 3.38 1.37
2.16 2.02 1.10 1.91 1.40 1.26 T.
0.07 0.10 2.05 2.67 1.52
2.90 2.87 2.24 1.99 0.44 0.60 2.77 3.06 3.70 3.47
4 12-13 25-26 13-14 11-12 30-31 11-12
1890 1896 1895 1888 1888 1896 1895

7-8 26-27 20-21
1889 1893 1894

21, 1900 a 13, 1888

27, 1892

24, 1892

Average.

Thun

der

storms.

Dec.

1

1

3

9

13

67

51

43

39 30

Greatest annual.

2.88 3.91 3.06 4.91 2.22 2.73 3.70

3.72

2.77

3.04

2.48

2.14

3.38 2.67

Date.

Year
1900.
January..
February
March
April....
May.

June
July....
August..
September
October...
November
December...

Year

Monthly mean.

....

O

Temperature.

Mean.

Maximum.

Minimum.

Monthly.

O

Extremes.

Maximum.

76

1899.

In.

In.

In.

80 0.259 0.299 6.50

January..
February
March

55

24 39 41 88

82 0.241 0.268

64

30.06 30.44 29.25 44.8 51.0 53.0 42.0 47.5 61
30.19 30.47 26.68 42.1 46.8 48.9 40.0 44.4
29.98 30.42 29.47 44.8 50.9 53.4 42.5 48.0
30.06 30.29 29.64 44.6 51.5 53.3 43.2 48.2
30.07 30.27 29.59 46.7 51.6 53.4 45.7 49.6
30.03 30.22 29.82 48.5 55.1 56.2 47.8 52.0

58

April..

43 44

May

40 46 48 92 76

June

July.

29.99 30.13 29.84 51.8 57.0 58.6 51.1 54.8 62 46
29.96 30.13 29.83 53.0
30.01 30.15 29.80 51.7 57.2 59.2 50.5 54.8

5.03
42 43 90 76 0.269 0.281 8.53
41 44
75 0.261 0.285 1.91
76 0.282 0.290 1.73
0.314 0.330 0.75
0.00
0.42
0.360 0.386 0.88
88 78 0.301 0.336 4.28
51 83 78 0.345 0.377 14.80
61 33 42 46 91 82 0.269 0.313 7.05
89 79 0.302 0.328 51.88

58.5 59.8 52.0 55.9 67 48 51

50 51 92 80 0.354 0.375 52 92 80 0.369 0.392 46 50 52 94 83

74

August.
September.
October..
29.99 30.29 29.55 48.7 55.5 57.9 46.1 52.0 76 39 45 48
November 29.92 30.28 29.53 53.9 58.4 61.3 50.5 55.9
December..... 30.08 30.53
29.55 44.4 51.7 54.1 41.8 48.0
30.03 30.53 29.25 47.9 53.8 55.8 46.1 50.9

69 41

47

Minimum.

Dew

point.

36

8 a. m.

48

Rela

tive hu

midity.

41 45 87

|

I

30.07 30.42 29.63 47.6 53.6 55.6 45.3 50.4
30.13 30.41 29.88 46.0 51.7 53.5 43.8 48.6
29.99 30.22 29.68 47.6 52.8 55.2 45.8 50.5
29.97 30.19 29.72 46.7 53.7 56.0

37

30.01 30.23 29.72 50.9 57.2 59.0 49.7 54.4

43 46

52.5 56.2

70

51

66

35 45 48 91 82 0.302 0.337 6.63
36 43 46 90 81 0.280 0.310
6.04
45
47 91 81 0.300 0.323 3.42
43 45 87 74 0.280 0.305 4.43
50 86 76 0.318 0.357 2.08
52 93 80 0.373 0.394 1.70
52 91 77 0.374 0.386 T.
53 92 78 0.382 0.401
53 91 78 0.363 0.399
53 93 86 0.341 0.398
0.339 0.393 8.06
0.332 5.27
34 47 50 90 80 0.330 0.361 44.98

48

51

47 52
45 50

29.95 30.12 29.78 53.0 58.5 60.0
29.92 30.10 29.74 53.6 59.2 60.5 52.4 56.4
29.96 30.18 29.79 53.8 59.8 61.1 52.8 57.0 66
29.94 30.15 29.75 52.7 59.8 61.6 51.7 56.6
29.95 30.28 29.49 50.3 56.7 59.1 48.4 53.8
29.96 30.34 29.42 50.1 55.8 58.6 48.0 53.3 72
30.09 30.32 29.53 49.0 54.2 56.2 45.5 50.8
30.00 30.42 29.42 50.1 56.1 58.0 48.4 53.2

69

67

39 48

36 48 52 93

34 45 48 86 79 0.302

a From observations at 8 a. m. and 8 p. m. 75th meridian time. Local mean time 3 h. 17 m. slow.

Moisture.

Vapor

pressure.

8 a. m.

8 p. m.

Precipitation. Cloudiness.

Total.

% In. In. In. In.

1.16 4.9 6.0 6.9 3.17 5.0 5.9 6.2 1.60 6.8 6.0 6.1 0.55 4.9 4.9 5.0 1.23 7.2 5.5 5.8 0.36 5.4 2.1 3.0 0.00 8.5 5.3 6.3 0.24 7.6 4.5 5.8 0.74 3.3 4.9 6.7 1.90 3.3 5.0 5.5 3.38 5.7 7.2 7.3 1.37 4.7 5.5 6.2

3.38 5.6 5.2 5.9

2.16 4.9 5.3 6.5 2.02 6.7 5.7 6.3 1.10 5.7 8.0 7.0 1.91 5.8 4.6 4.8 1.40 6.6 6.1 5.4 1.26 7.2 5.5 6.1 T. 7.7 3.3 4.6 0.07 0.07 5.0 2.8 4.7 0.21 0.10 5.5 3.1 4.3 7.07 2.05 4.8 5.4 5.7 2.67 3.7 7.2 6.5 1.52 5.5 4.5 5.3 2.67 5.8 5.1 5.6

ANNUAL METEOROLOGICAL SUMMARY FOR THE YEARS 1899 AND 1900.

[H=62 ft.; ht = 60 ft.; hr = 52 ft.; ha = 69 ft.]

Number of winds, 8 a. m. and 8 p. m.

1 0 1 4 11

0 0: 4 3 16

7 0 11

18 147 38 121

Some time ago the observer at Eureka arranged with the Humboldt Jetty office for gratuitous daily information respecting the approximate force and direction of the wind and the condition of the ocean adjacent to the bay. To the harbor entrance is a distance of about 7 miles, and the two jetties there extend out into the ocean 7,000 feet. Very often when outside there is a gale with an extremely rough sea; inside there is a calm or a wind from a different direction. Herewith is a rough sketch of the coast from Cape Mendocino to Patricks Point, a distance of about 40 miles. The coast line is some 10 miles east of a line joining the bluff points of Cape Mendocino and Patricks Point. Still farther to the east the hills form a greater curve, placing the lowlands on which Eureka stands in a protected position from the northwest, east, and southeast, and greatly modifying the conditions prevailing beyond the limits of the area shown in the sketch.

By running a line from the cape to the point one will probably discover that during a severe southeast storm from, say, 20 to 50 miles off coast there is often inside the line or near the coast but a moderate wind. Moreover, a west to northwest wind is much more severe outside than inside this line. The force of southeast winds is no doubt frequently broken by Cape Mendocino and the adjacent hills. Greatly modified in intensity and somewhat deflected, they again approach the coast north of Patricks Point; but in a heavy south wind the resistance of the cape seems inconsiderable. Often in summer, during a moderate wind of 15 miles or more at sea, near the coast and even on the bay it will -blow quite strongly. On this coast only seldom does a wind for any great length of time blow directly from the southwest. On its approach to the land it will veer either to the south or to the northwest. During a southeast wind along the coast there is invariably a southwest wind at

After a southeast storm a heavy sea from the southwest causes the bay to become rough and extremely dangerous for vessels. Frequently on approaching the coast northwesterly winds will be met by warm currents of air from the land. The result in every instance is fog, and generally a material reduction in the force of the wind. Cape Mendocino

In forecasting southeast storms the high hills east and southeast of this station and extending to Cape Mendocino should be allowed for.

९

IFIC

OCEAN

Patricks Point

CLIMATE OF SAN FRANCISCO.

7000

Jetty

Bay

TRINIDAD

EUREKA

72.40

FIG. 5.-Sketch map of Eureka and vicinity.

On the coast of California there is a city justly famed for the abnormalities of its climate. Overcoats and heavy wraps are worn in midsummer, while the lilies bloom in December. From May until September very little rain falls, yet during this period with clock-like regularity great banks of fog march in every afternoon and cover the bare, brown hills. The city of San Francisco, the gateway to the Orient, as it has been termed, is strangely situated with respect to ocean, bay, mountain, and valley. It may perhaps be said of this city that nowhere else can such a strange mixture of marine and continental climates be found. The topography is such that marked contrasts can be found within comparatively short distances. Certainly the climatologist finds in the vicinity of San Francisco so many climatic anomalies that he feeis as if he

1176-Bull L-03-3