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Date.

1899.

1900.

Monthly mean.

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8 p. m.

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Temperature.

Mean.

Maximum.

O

Minimum.

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Monthly.

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In.

In.

In.

January.
February
March

29.98 30.24 29.35 50.1
.CO 30.34 29.62 47.5

56.1 58.3 47.6 53.0 78
54.4

58.0 45.3 51.6 80

29.89 30.21 29.53 49.1 54.7 57.3 47.1 52.21 74

April...

29.87 30.05 29.61

49.6

May..

57.6 61.2 47.9 54.6
29.87 30.03 29.61 48.2 54.5 58.3 46.9
29.56 52.0 58.0 63.4 50.4

June

56.9

29.78 29.97
29.78 29.93 29.64 51.5 57.1 61.5 50.3 55.9

July..

73

August..
63.5 53.1 58.3 78
September.
65.1 51.3 58.2 73
October
66.152.5 59.3 9-1
November
61.0 52.6 56.8 65
December..... 29.98 30.33 29.59 46.9 52.0 54.8 44.4 49.6

29.78 29.86 29.66 54.7 60.0
29.83 29.96 29.61 52.4 58.8
29.83 30.12 29.45 55.2 60.8

29.88 30.10 29.48 54.4 58.6

63 49.1 54.9 94

Year

29.87 30.34 29.35

51.0 56.9 60.7

Extremes.

Maximum.

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Minimum.

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59.6 63.7 51.6 57.6 74

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Dew

point.

8 a. m.

8 p. m.

8 a. m.

In.

In.

0.312 0.315 3.67 0.295 0.321 0.10 0.321 0.342 7.61 0.307 0.311 0.62 0.295 0.297 0.86 0.01 50 51 95 80 0.359 0.370 0.00 0.391 0.395 T. 0.382 0.399 0.00 85 71 0.364 0.364 3.92 0.383 0.402 3.79

92 74 0.353 0.354

92 77

48 52 53 98 81

37 44 44 89 76 0.290 0.296 2.65

52.6 80 43 44 45 88 70

42 47 48 92 81

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43 45 45 87 66

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midity.

86 74

46 88 75

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48 52 53 90 82

8 p. m.

January.
February
March

April..

May..

29.84 30.03 29.67 52.2 59.0 63.5 50.6 57.0 71

June

29.79 29.96 29.63 53.2
29.73 29.94 29.54 53.5 59.8 64.6

July..

51.9 58.2 73

53.9 59.7 82

64.7 70.4 56.2 63.3 92 47 53 51 84

60.4 65.1

52.4 58.8 83

51 50 88 71

August..
29.79 30.03 29.59 55.8 60.7 65.5
September. 29.79 29.98 29.41 58.6
October... 29.85 30.07 29.56
54.8
November 29.88 30.15 29.28 53.9 58.7 62.2 50.4 56.3 79 45 50 50 88
December..... 30.03 30.17 29.68 48.4 52.8 55.1 45.4 50.2 63 40 44 46 86 78
Year
30.20 29.28 52.5 58.2 62.1 50.4 56.2 92

75

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29.97 30.17 29.63 48.8 52.9
29.98 30.20 29.62 49.9 56.8
29.85 30.12 29.65 51.2
57.0 61.3 49.1 55.2 71

54.7 46.7 50.7 64
59.5: 47.8 53.6 68

29.83 30.00 29.54 50.2 55.8 59.5 48.4 54.0 69 45 44 46 81 70 0.294 0.312

1.08 70 0.337 0.348 0.32 76 0.377 0.390 0.05

!

46 48 90 84 0.310 0.335
46 46 88 69 0.315 0.313

48

49 89 76 0.335 0.350

47 51 52 94

Moisture.

Vapor

pressure.

8 a. m.

48 49 90 76 0.338 0.347 23.23

8 p. m.

50 52 52 90

Precipitation. Cloudiness.

Total.

In. In.

52 92 75 0.374 0.381 T.

76 0.396 0.398 T.
66 0.409 0.380 0.46
0.381 0.368 1.48
0.366 0.361 3.91
0.293 0.311 1.37

Maximum in 24
hours.

29.86

40 49 49 88 74 0.349 0.354 15. 33

a From observations at 8 a. m. and 8 p. m. 76th meridian time. Local mean time 3 h. 10 m. slow.

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4.11 1.92 5.6 5.7 5.8 0.64 0.50 3.9 4.4 3.8 1.91 0.90 4.8 4.6 4.5 0.36 3.8 4.3 3.8 0.22 3.9 4.0 3.3 0.04 6.5 3.7 3.9 T. 4.9 1.4 2.0 T. 4.7 3.2 3.4 0.45 2.9 2.4 2.6 0.34 4.1 3.9 3.9 1.66 4.6 5.2 5.4 0.74 4.8 4.7 5.0 1.92 4.5 4.0 4.0

'Daylight.

0.98 4.8 7.0 6.7
0.08 2.6 3.3 4.6
2.15 4.6 6.4 6.5
0.45 2.9 3.0 3.0
0.77 2.6 2.0 2.6
0.01, 3.7
1.5 2.0
0.00 6.3 2.4 3.6
T. 7.0 2.5 3.3
0.00 3.1 | 1.7 3.0
1.94 3.8 3.6 3.0
1.51 4.9 6.4 5.8
1.17 2.1 4.7 3.8
2.15 4.0 3.7 4.0

I

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ANNUAL METEOROLOGICAL SUMMARY FOR THE YEARS 1899 AND 1900-Continued.

[H=155 ft.; ht=161 ft.; hr=154 ft.; ha=167 ft.]

Mi.

7.9 SE.

47 SW.

8.7

W. 39 W. W. 36 W. 11.7 W. 38 W.

9.8

13.9 W.

37 W.

14.2 W.

W.

44 15.3 SW. 41 W. 14.4 SW. 39 W.

12.6 SW. 40. W.

41 W.

8.5 W. 6.6 SE.

30 SW.

8.6

N.

30 SW.

11.0

W.

47

SW.

Year 1900. January.. February

46

SE.

7.2 N. 7.2 W. 10.0 W.

March

April....

May.

June

32 W. 35 SW. 11.8 W. 35 W. 12.1 W. 39 W. 14.3 SW. 41 W. July.. 14.5 SW. 37 SW. August.. 13.1 SW. 38 SW. September 10.9 W. 32 SW. October.... 9.1 W. 31 SW. November 6.9 N. December..... 7.3 Year.... 10.4

43 S.

N.

48 S.

W.

48 S.

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Sept. 6, 1849..
Oct. 13, 1849.

Oct. 15, 1849.

Oct. 16, 1849.

SOME MAXIMUM AND MINIMUM TEMPERATURES.

The following tables showing the temperature when the thermometer registered 80° or above and 32° or below (Fahrenheit), with dates of same, were kindly furnished by Mr. Thomas Tennent. The thermometers used by Mr. Tennent were self-registering instruments purchased from McAllister & Co., of Philadelphia, Pa., and brought out by him in 1849; they were tested and found to be correct. The thermometers were exposed on the north side of a building, on supports about 10 inches from the walls and about 6 feet above the ground. The readings were made by Mr. Tennent personally, and cover the period from September 1, 1849, to December 31, 1871:

Maximum temperatures.

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°F.

30 Feb. 9, 1857.

Jan. 7, 1858.

28

Jan. 14, 1858.

30

Feb. 9, 1858..

31 Mar. 18, 1858

31

32

32

29

Dec. 9, 1858.

31

Jan. 7, 1859

32

Jan. 9, 1859.

32 Jan. 10, 1859

30 Jan. 11, 1859

30

Jan. 12, 1859.

29

Dec. 22, 1859 .

30

Jan. 18, 1861

30

30

32

31

25

31

29

32

28

29

Feb. 1, 1862.

30

Feb. 2, 1862.

30

Feb. 3, 1862.

30 Feb. 4, 1862.

Dec. 3, 1858.

Dec. 7, 1858.

Dec. 8, 1858.

Jan. 3, 1862.

Jan. 4, 1862.

Jan. 24, 1862.

Jan. 25, 1862.

Jan. 26, 1862.

Jan. 27, 1862.

Jan. 28, 1862.

Jan. 29, 1862.

Jan. 31, 1862.

31 Feb. 7, 1862.

29

Feb. 8, 1862.

32

Feb. 20, 1862.

30

Mar. 9, 1862

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NOTES FROM THE RECORD OF G. H. GIBBONS, M. D

[From the California Star, San Francisco.]

January 19.-Ice nearly one-fourth inch thick-the first of the season; said to be a cold winter. February 13.-Heavy rains still continue at regular intervals of four to eight days. Already more rain this season than in last three years.

April 3.-A number of heavy rains in last six days. Dry weather for four or five weeks preceding. Dry weather appears to have followed.

1847.

May 8.-During the past week a succession of showers, sufficient to moisten the earth-the annual "May rains;" none to come after. San Joaquin country flooded; unusual amount of rain on the mountains in winter.

May 22.-Several light showers during past week.

July 2.-A light but refreshing shower, barely sufficient to render the dust adhesive; a promise of more.
August 21.-Cold winds and heavy fogs throughout the week.

August 28.-A heavy shower of rain in evening, with thunder and lightning, extending some miles back.
September 18.-A week of hot and calm weather; 92° in shade.

September 25.-Sou'westers, sea fogs, etc.; "cool to overcoating" this week.

October 20.-A furious norther, lasting till evening.

October 30.-Weather dubious, inclining to "heavy wet."

November 6.-Winter fairly closed in. The past week cold and disagreeable, with drenching rains and cold winds. For a few days no locomotion allowed.

1848.

February 26.-Rain fell abundantly the past week, and snow on the mountains.

March 18.-Heavy rains during the week. Several weeks preceding the weather was delightful; 63°.
April 1.-Rains have been abundant.

1849.

[San Francisco Whig of September 3, 1852.]

September 19.-Thunderstorm on Mokelumne River.

[From the Alta-California, April 17, 1850.]

The first southeast blow was on November 13 and the last in March; 7 southeast blows in that period, and seventy-one days rain in those one hundred and thirty-nine days. Mean barometer 29.12; temperature 57°.

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November 19.-Rain at times; began in morning; slight showers frequent through the day and night. Severe gale from southeast in p. m.; blew down Presbyterian church on Stockton street and damaged shipping.

November 22.-Rain storm. Price of carting raised from $1 and $1.50 to $2 and $2.50 from mud.
November 23.-Calaboose inundated 1 foot during night.

The tables of monthly and seasonal rainfalls for San Francisco are given on page 9.

TOTAL NUMBER OF DAYS ON WHICH PRECIPITATION HAS FALLEN FROM MARCH 1, 1871, TO MARCH 1, 1901.

January
February

March

April

May

June..

July

August

September....

October...

November.
December

January
February

March

April

May

June.

January
February

March

April

May June..

Month.

January
February

March

April

May

June..

Record commencing September 1, 1881.

Month.

Month.

Month.

30 to 35.

20

21

41

82

121

196

Velocity.

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2 to 3.

8.8

10.5

13.4

16.7

18.0

20.8

48

SW.

48

SW.

44

N.

47 NW.

45

W.
SW.

48

Direc-
tion.

Over 40.

3 to 4.

Date.

8.6

10.8

14.1

17.3

18.5

21.3

2

8

Less than
0.01.

26, 1875 a 22, 1891 8, 1880

23, 1871 11, 1897 30,1873

a Cups blew off before maximum was reached.

4 to 5.

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NUMBER OF HIGH WINDS, SEPTEMBER, 1881, TO DECEMBER 31, 1900."

52

8

July

1 August
September..

• October..

31

31

0.01-0.10. 0.11-0.25. 0.26-0.50. 0.51-1.00.

a All wind velocities are given in miles per hour.

November.
December

113

July
August
September...
October.
November
December

125

129

101

8.0 July

10.8

14.1

August
September.
October.

16.9

18.1 November

21.0 December

74

46

16

13

32

62

77

7

AVERAGE VELOCITY OF AFTERNOON WINDS.

Month.

Month.

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Month.

56

63

44

24

1

22

HIGHEST WIND VELOCITY, DIRECTION, AND DATE FOR EACH MONTH TO DECEMBER 31, 1900.

47

58

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b Also other dates.

41

42

40

41

56 60

2 to 3.

61

21.0

20.2

17.7

13.4

9.2

8.4

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Over 1.00.

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