Bulletin

1871.

1872.

1873.

1874..

1875.

1876.

1877.

1878.

1879.

1880.

1881.

1882.

1883..

1884.

1885.

1886.

1887.

1888.

1889.

1890.

1891.

1892.

1893.

1894.

1895.

1896.

1897.

1898.

1899.

1900.

1901.

Greatest

Year.

April

May June..

GREATEST PRECIPITATION (INCHES AND HUNDREDTHS) IN TWENTY-FOUR HOURS FOR EACH MONTH.

Jan.

January
February

March..

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

0.82

0.57 1.28 0.73 0.54 0.81 0.65 0.27 0.45 1.80 1.59

0.56

1.01
3.31

0.57

0.69

0.86

1.63

2.21

0.55

0.65

0.52

1.34

3.08

1.86

Month.

2.36

1.28 0.13 0.35 0.15 0.36 0.00 0.70 0.23

1.02

1.61

2.19

0.06

0.14

1.76

0.60

0.24

1.63 0.52

0.08

0.18

1.98

0.61

0.14

1.92 1.04 1.66 0.64 4.67 1.37

1.03

0.72 0.93 2.21 0.84 1.09 0.17 0.44 0.15 0.76 1.23

0.57 0.82

1.30

0.71

1.44

1.52

1.66

0.12

0.97

0.15

2.03

0.04

2.40

0.18

1.36

0.21

0.80

3.60

1.45

0.03

1.58

0.38

0.11

0.19

0.81 0.59

2.08

1.63

0.75

3.38

0.68

1.06

1.03

0.90

1.39

1.06

0.98

2.61

1.96

1.05 0.34
1.44 0.67
0.84

1.85

0.18

0.30 1.29
0.55
0.53
1.20 0.61
0.38
1.15
0.71 0.14
0.30
0.68
0.89 0.27
2.43 0.34
0.20 0.61
0.19 1.23
0.08 2.15
0.45 0.77
0.50 0.90 0.36 0.22
1.95 0.67
0.88
0.46
4.67 3.60 3.31
2.43 1.29
1.23 0.23
0.06
1.04
2.03 3.98
3.14
date. 29, 1881 4-5, 1887 4-5, 1879 23-24, 1896 4-5, 1889 11-12, 1884 16, 1886 29-30, 1896 29-30, 1894 17-18, 1889 23, 1874 18-19, 1871

1.08

1.23

1.42

0.33

0.78

0.13

0.98

1.92

1.75

0.01 0.00
0.03 0.01
0.01 0.01

0.13

0.00

0.90

0.00

0.04

0.01

0.02

0.01

0.05

0.01

0.00 0.00
0.41 0.00
0.02 0.00
0.01 0.00
1.23 0.00
0.05

0.10

0.01

0.23

0.07

0.10

0.01

0.03

0.01
0.05 0.02
0.10 0.09
T.
0.00

0.03
0.02
0.22 T.
0.00 0.01
0.00 0.04
0.19 T.
0.18 0.00
0.01 0.00
0.04 T.
T.

Year. Amount.

1862

1878

1879

1880

1883

1884

0.02 0.00

0.05

0.00

0.01

0.00

December 17 and 18, 1871, from 11.43 p. m. 17th to 11.43 p. m. 18th.
December 18 and 19, 1871, from 11.43 p. m. 18th to 11.43 p. m. 19th
November 22 and 23, 1874, from 11.08 p. m. 22d to 11.08 p. m. 23d..
March 4 and 5, 1879, from 4.43 p. m. 4th to 4.43 p. m. 5th..

January 28 and 29, 1881, from 11.08 p. m. 28th to 11.08 p. m. 29th..
November 23 and 24, 1885, from 11 p. m. 23d to 11 p. m. 24th.
December 21, 1885, from 1.35 a. m. 21st to 1.35 p. m. 21st.
February 4 and 5, 1887, from 3 p. m. 4th to 3 p. m. 5th..
March 12 and 13, 1889, from 8.15 a. m. 12th to 8 a. m. 13th...
February 14 and 15, 1891, from 8.45 p. m. 14th to 8 p. m. 15th...
January 19 and 20, 1894, from 8 p. m. 19th to 8 p. m. 20th
November 23 and 24, 1896, 6 a. m. 23d to 6 a. m. 24th...

24.36 July

12.52

8.75

10.06

3.52

2.57

0.02

0.00

0.03

August
September..
October.
November
December

0.00

0.01

0.01 T. 0.00 0.02

0.00

0.06
T.
T.
T.
T.

0.00

0.04

0.00

0.02

0.00

0.20

0.00

0.45

0.00

0.25

0.26

0.42

0.21

0.11

0.01

0.18

0.92 T.

0.31

0.63

0.02

0.12

1.04

0.62

0.41

0.08

0.73

0.00

0.45

DATES WHEN PRECIPITATION EQUALED OR EXCEEDED 2.50 INCHES IN ANY CONSECUTIVE TWENTY-FOUR HOURS.

Inches.

2.83

3. 12 3.98

3.31

4.67

2.58

2.78

3.60

3.08

3.38

2.61

2.79

Maximum rates of rainfall January 1, 1893, to December 31, 1900: Five minutes, 0.16; 10 minutes, 0.19; 1 hour, 0.55. On February 22, 1901: Five minutes, 0.17; 10 minutes, 0.21. On October 23, 1902: Five minutes, 0.16; 10 minutes, 0.20. On February 7, 1903: Five minutes, 0.19; 10 minutes, 0.23.

GREATEST MONTHLY PRECIPITATION AND DATE.

Month.

Dec.

0.77 0.80

1.58

3.98

0.22

2.37

1.39

0.19

0.36

0.56

1.27 0.45

0.56 1.38
0.05 0.32
0.21 1.34
1.40 2.41
1.19 1.01
1.15 0.19
0.70 2.58
0.72 0.77
0.00 0.48
0.05 1.68

2.03

0.92

0.00

0.03

0.26 I

0.91 1.46
0.10 1.69
0.64 0.88
0.06 1.06
1.46 2.79
1.41 0.42
0.45 0.36
1.94 1.51:
0.34
1.66

3.14

2.33

0.15

1.50

0.00

1.11

0.33

1.55

2.36

1.35

0.76

0.28

2.07

2.78

1.10

1.14

1.51

1.46

1.90

2.21

2.34

0.97

1.64

0.51

1.65

1.02

0.70

1.17

0.74

Greatest annual.

1886

1864

1898

1889

1885

1866

3. 14

2.36

2.33

3.98

2.37

1.80

1.63

1.98

3.31

2.36

4.67

2.41

1.63

2.21

2.78

2.40

3.60

1.68

3.08

2.08

3.38

2.34

1.69

2.61

1.96

2.79

1.42

1.23

2.15

1.92

Year. Amount.

0.23

0.21

1.06

7.28

11.78

15.16

January.
February

March

April

May

June.

January

February

March

April

May

June.

1a.m.

2 a.m..

3 a. m.

4 a. m.

5 a. m.

6 a.m.

7 a. m

8 a. m..

9 a. m.

10 a. m

11 a. m.

12 noon

1 p. m

2 p. m...

3 p.m.

4 p. m.

5 p.m.

6 p. m.

7 p.m.

8 p. m.

9 p.m.

10 p.m.....

11 p. m.

12 midnight

Average

Month.

LEAST MONTHLY PRECIPITATION AND DATE.

NUMBER OF TIMES MONTHLY PRECIPITATION HAS EXCEEDED THE NORMAL FOR FIFTY YEARS.

Year. Amount.

1852

1864

1898

1857

(a)

6.1

6.2

6.3

6.4

6.5

6.4

6.5

7.0

7.6

7.9

8.2

8.4

8.7

8.8

8.6

8.0

7.6

7.3

6.8

6.5

6.1

5.9

6.0

7.0

First 25
years.

0.58 July.

0.00 August

0.24

0.00

a Many years.

Second 25 years.

September..

October.
November.
December

AVERAGE HOURLY WIND VELOCITY (MILES PER HOUR).

6.7

6.3

6.2

6.3

6.1

Feb. Mar. Apr.

July
August

September.

October.
November.
December

6.1

6.6

7.3

6.1

7.3

5.9

7.0

5.8

6.6

5.9

6.3

6.1

5.9

6.0

5.8

6.2

7.0
1
7.8

6.9

7.6

8.0

8.6

7.6

8.4

9.7

7.8

9.2

11.6

8.6

9.6

10.6 13.9
12.2 15.6
13.4 16.7

10.5

10.8

14.1

10.8

14.1 9.8 13.1

9.0 11.6

8.3

9.9

7.4

8.6

7.0

7.8

6.4

7.2

6.1

6.8

7.6

8.8

Month.

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Total.

Year. Amount.

(a)

(()

1890

1876

Oct.

First 25

years.

9.3

9.2

8.9

6.8

5.3 5.0

8.8

8.5

6.4

8.2

6.0

4.9

7.61

7.9 7.6

7.8

5.9

7.1

7.4

7.3

5.6

5.2

4.8 5,1
4.8
4.7 I
4.7

6.9

7.4

6.9

5.4

5.3

6.7

7.1

7.4

6.8

5.4

5.1

7.5

8.1

8.0

7.4

5.8

5.0

5.5

8.6

7.8

6.4

5.6

6.1

8.9

7.0

6.2

6.6

11.1

8.3

6.7

8.1

6.8

15.4

17.0

7.4 8.6 9.2

18.0

8.3 8.8
9.3 10.3 9.9
11.0 12.4 11.8
13.3 15.2 14.7
13.3 10.7
17.8
17.4 16.0 13.3 9.9
19.8 19.7 18.5
15.7 11.8
20.8 21.0 20.2 17.7 13.4
17.3 18.5
21.6 20.9 18.5 14.0
16.9 18.1
22.0 20.8 18.4 14.1
15.9 17.1
20.7 19.9 17.0 13.2
14.3 15.2 18.2 18.7 17.5 14.8
12.3 13.1 16.1 16.2 15.2 12.0
10.6
11.3. 13.5 14.0 13.3 10.0
10.0 11.8 12.3
11.3
9.0 10.8 10.8
10.2
8.3 10.1 10.0 9.4
10.4. 11.3
13.1 12.3

21.3
21.0
20.1

9.4
9.6
8.8
7.7

11.0
9.0

6.7

7.7

6.1

9.5

9.0

6.6

5.6

8.6

6.0

5.2

8.2
7.4

7.8

5.6

5.1

13.0

10.1

7.8

6.6

0.00

Second 25 years.

Dec.

6.1

6.2

6.3

6.4

6.5

6.6

6.8

7.1

7.7

7.8

7.9

8.2

8.5

8.4

8.1

7.7 7.6

7.0

6.7

6.6

6.4

6.2

6.0

7.0

January 4, 1888.-A few flakes of snow fell during the day.

January 16, 1888.-Light snow fell to the depth of 0.1 inch.

March 2, 1894.-A few flakes of snow fell during the day.

March 2, 1896.-Snow mixed with rain fell at intervals during the day.

March 3, 1896.-Heavy snow fell during the night; depth at office at 8 a. m., 1 inch.
February 3, 1903.—Snow and rain, large flakes, 11.16 to 11.20 a. m.

December 20-1 a. m. to 8.15 a. m

Total in 21 hours

January 21, 1876.-Light snow fell for ten minutes.

December 31, 1882.--Heavy snow fell from 11.30 a. m. to 4.20 p. m.; amount, 3.5 inches.

February 6, 1883.-A few flakes of snow fell during the day.

February 7, 1884.-Snow fell at intervals during the day, depth varying from 1 to 2 inches.

February 5, 1887.-Snow fell during the day; depth at office, 3.7 inches, while in the western portion of the city it was fully 7 inches deep.

Inches.

1.47

7.76

THE GREAT RAINSTORM OF 1866.

Mr. L. J. Le Conte, C. E., of Oakland, has kindly furnished the following relative to the great rainstorm in this city on the 19th and 20th of December, 1866:

Our profession is interested in maximum rainfall in twenty-four hours. I inclose a copy of the record of the memorable rainfall of December 19 and 20, 1866, which is given in hourly subdivisions. The monthly rainfall was also the maximum on record-15.16 inches-while at Sacramento the record was 12.90 inches. I think this was published in full in the Evening Bulletin in December, 1885.

Following is the record referred to:

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RAINFALL (INCHES AND HUNDREDTHS) AS MEASURED BY JOHN PETTEE, JANUARY 1, 1865, TO MARCH 19, 1902. [In this record the day commences at about 7 a. m. on the date mentioned and ends on the succeeding day at about 7 a. m.]

September 24.. September 26.. October 7

October 8

October 24..

October 29.

October 30. November 13.. November 14 .. November 16.. November 17.. November 18.. November 19.. November 20.. November 21.. November 22.. November 30. December 1.... December 7.... December 9.... December 13... December 21... December 23... December 24... December 25... December 26..

Amount.

0.04
0.08

0.02

0.04

0.88 0.22

1.07

0.37
0.10

1.41
0.01

0.02 0.35 0.07 0.05 0.11 0.04 0.53 0.08

0.03

0.04

0.26

0.34

0.05

0.04

0.03

0.11

0.22

Date.

Rain year 1864-65.

1866. January 5.. January 6.

January 7..

January 8..

January 10... January 11.. January 12..

January 13..

January 16... January 17... January 18..

January 19...

January 20..

January 21..
January 22..
January 23..

January 24.

January 31...
February 1

February 2

February 3....

February 5

February 9

February 10

February 12

February 26

February 27

February 28

March 1

0.49

March 4

0.09

March 5

0.01

March 6

0.29 March 7

0.33

March 8

0.01

March 17

0.10

March 18

0.13

March 19

0.03

March 20

0.11 March 21

0.03

March 22

0.17

March 23

March 24

March 25

0.01
0.95
0.03 March 29
0.83 March 30
0.09 March 31
0.15 April 14.
0.07 April 18.
0.74

April 29.

April 30.

May 12.

0.19
1.07
0.47
May 17..
0.02 May 21.
0.05
May 22.
0.01
May 25..
0.01 May 26.
0.04 May 27..
0.30 June 8
June 21

0.09

0.08

0.01

Total

Amount.

0.32
0.24

1.32

0.58

1.08
0.59
0.05
0.80
1.35

0.74

0.01

0.35

3.08

0.52

0.06

0.12 0.13 0.27 0.05 0.55 0.14 0.13

0.06

0.01

0.04
0.05
0.04

0.31

0.02

0.04
0.10

0.46

0.35

0.04

0.01

0.67

0.01

0.22

0.01

0.02

0.01

0.08

0.12

0.07 0.10 0.44 0.03

0.01

0.15

0.02

0.01
0.01

0.19

0.10

0.95
0.10
0.31

0.13

0.01

23.57

Date.

Rain year 1866-67.

1866. November 2 November 3 November 4 November 6... November 7... November 16.. November 19.. November 23.. November 24.. November 25.. November 29.. November 30.. December 1.... December 2... December 3.... December 10... December 11... December 12... December 14... December 15... December 16... December 17... December 18... December 19... December 20... December 21... December 23... December 24... December 25... December 26... December 27... December 28... December 29... December 30...

1867. January 2. January 4.. January 5... January 10... January 11.. January 12... January 14... January 18... January 19... January 20.. January 21. January 22. January 23... January 24. January 25... January 26... January 29. February 2 February 9 February 18... February 19 February 20 February 21 February 25 February 26

a Part.

Amount.

0.28
0.05

0.35

0.01

0.11 0.31 0.06

0.16 0.53 0.43

0.60

0.17

0.70
0.13

0.12
0.13
0.59

0.01
0.02
1.03

0.10

0.16

2.41

0.14 7.67 0.67 0.13 0.08 0.04 0.78 0.10 0.41 0.28 0.20

0.01 0.39 0.64 0.02 0.24 0.75 0.04 0.08 0.34 0.46 1.14 0.34 0.70 0.04 0.17 1.03 0.26 0.02 0.01 0.56 0.65 1.74

1.76 0.14 0.04

Date.

Rain year 1866-67. 1867. February 27 February 28

March 1

March 8

March 16

March 17

March 20

March 21

March 31

April 4..

April 5..

April 9..

April 10..

April 11.

April 12.

May 17..

May 24.

Total....

Rain year 1867-68.

1867. September 14.. October 5...... November 5... November 6... November 18.. November 19.. November 20.. November 21 November 23.. November 24.. November 25.. November 30.. December 1.... December 7.... December 8.... December 9.... December 12... December 15... December 16... December 17... December 18... December 20... December 21... December 22... December 23... December 24... December 25... December 29... December 30... December 31...

1868. January 1... January 2. January 3. January 4. January 8. January 11..... January 12....

February 25...

February 26...

February 27...

February 28...
February 29

March 1
March 2

March 3

March 4

March 11

March 12

March 13

March 14

March 15

March 20

March 21

March 22

April 1.

0.17 0.30

April 2. 0.63 April 3..

April 6.

April 9.

April 10..

April 11.

0.36 0.02 0.10 0.54 1.75 0.73 0.80 1.21

April 13.

2.03 0.72 0.83

0.63 0.11 0.68 2.40

January 26..

February 7 February 19... February 20

February 21

February 22

February 23

February 24...

April 14.

April 29.

April 30.

May 12

May 13

May 18

June 12..

June 22.
June 23.

Total

Rain year 1868-69.

1868. September 30.. October 1. October 2. October 22...

Amount.

0.05 0.53

1.07

0.04

0.50

1.00

0.81

0.82

0.77

0.87

0.08

0.24

0.54

0.33

0.11

0.02

1.43

0.31

2.41

0.21

0.18

0.38

0.09

0.11

1.39

0.17

0.22

0.04

0.67

0.11

0.22

0.07

0.93

1.02

0.02

0.03

0.12

0.14

0.45

0.21

0.86

0.10

0.01

0.14

0.03

0.02

0.01

0.10

0.06

40.62

0.12 0.08

0.02

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