CLIMATE OF SOUTHERN COAST.

Data by Mr. JOHN R. WILLIAMS, Observer, U. S. Weather Bureau.

San Luis Obispo is situated in latitude 35° 18' north, longitude 120° 39' west. It is distant from Port Harford, or the Pacific Ocean, about 10 miles. A range of low hills intervenes between the coast and the city. The average elevation of the San Luis Range to the west is about 1,000 feet. The San Luis Valley southwest of the city has a general elevation of less than 150 feet. Directly west of the city, at a distance of about 1 mile, is a large hill (Cerro San Luis Obispo), elevation 1,292 feet. East of the city are the foothills of the Santa Lucia Range, varying in elevation from 1,700 feet 2 miles east of the city to 2,830 feet 5 miles east. The general elevation of the city is about 200 feet above sea level. The elevation of the Weather Bureau office is 201 feet.

1869-70.

1870-71.

1871-72..

1872-73..

1873-74..

1874-75..

1875-76.

1876-77.

1877-78..

1878-79.

1879-80..

1880-81.

1881-82.

1882-83.

1883-84.

1884-85.

1885-86.

1866-87.

1887-88.

1888-89.

1889-90.

1890-91.

1891-92.

1892-93..

1893-94.

1894-95..

1895-96.

a

Owing to the topography, the range of temperature is large. Daily ranges of 40° or more are not infrequent. The lowest temperature recorded is 24° and the highest 106°. The mean annual temperature is 58.9°. The mean annual rainfall, based upon Weather Bureau records covering a period of six years, is 17.22 inches.

The following table, showing the seasonal rainfall at San Luis Obispo for the past twentyeight years, is taken from the pamphlet "On the climate and wealth of San Luis Obispo County," by Myron Angel:

MONTHLY AND ANNUAL PRECIPITATION (INCHES AND HUNDREDTHS).

Season of

Aug. Sept. Oct.

T.

0.20

Nov. Dec. Jan. Feb. Mar. April. May. June. July. Total.

2.90

0.78 0.71 4.85 0.74 2.40 0.85
1.51 4.43
2.79 0.28
5.16 3.45 0.71 1.37
5.00 1.79

13.93

6.00

7.96

0.48

0.25

!

4.29 4.04 3.23 1.00
12.10 0.28 0.50
2.20 9.87 5.29 5.30 1.26
4.83 0.42 1.74
1.42 3.90 7.88 11.91 2.74 2.75
1.50 2.58 1.78 2.15 1.60 1.80
1.40. 3.03 1.75 7.23 2.36 8.78 0.52
0.48 13.35 4.71 1.90 1.40 1.85
0.25 2.00 0.85 3.40
6.75 1.73
0.69 2.95
0.44 1.50 1.60 4.88 1.10 3.85
3.56 10.57 10.21
12.41
3.39
2.17 0.13 8.85 2.25
0.94 3.15 0.10
0.04 12.90 3.67 5.78 0.79 2.37 3.75
0.25 1.25 1.06 1.10 9.60 1.29 1.56
1.40 3. 15 7.02
0.28
3.84 0.14
4.48 3.36
1.50
2.08 7.51 0.61
2.46 11.37 7.27 4.67 3.07
0.29 0.41
0.42 6.04 0.88 7.14 1.97 1.96 0.13 0.15
0.20 5.15 0.70 2.88 4.25
0.60 2.23 0.05
6.57 4.02 6.35 9.33 1.14 0.08
1.64 1.83 2.31 0.79 0.41 1.32
5.45 8.02 1.92 2.93 0.67 0.47
0.68 8.23
3.16 2.22 0.10 T.
1.44 3.02 3.04 5.22 4.40 3.17 0.18

0.84

0.68

0.82

0.27

4.28

1.16

0.75

0.40' 1.65

SAN LUIS OBISPO.

2.05 0.25

9.19

0.66

0.38

2.40

2.05

6.20

0.15 2.76 0.03 0.82 0.45 1.71 0.35 1.80 1.56

1.81

T.

T.

11.83

12.97

27.02

12.79

20.52

19.69

30.12

8.15

30.60

11.66

25.82

23.69

17.03

17.01

42.40

17.59

29.30

16.56

18.33

19.54

38.33

19.51

16.33

30.40

9.86

23.33

17.79

20.67

PRECIPITATION, IN INCHES AND HUNDREDTHS-Continued.

Jan.

Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec. Annual.

1.80

1.56 0.68

1.44: 3.02 3.04

8.05 1.82 2.44
8.23 0.00 3.16
5.22 4.40 3.17
1.37 2.20 0.91
5.56 0.28
2.13 0.16
5.09 1.48

0.67 0.47 0.00 0.00 T.
T.
2.22 0.10 T.
0.04 0.20 T.
0.18 0.04 T.
0.00 0.00 0.07 0.79 0.07 0.65
0.04" 0.00 0.00 0.20
0.39 0.08 0.64
0.10 0.92 0.00 0.00 0.00 3.92 1.94 4.51!
0.98 1.38 0.01 T.
T.
T.
1.93 8.01 0.26
0.94 0.52 0.16 T.
0.03 0.04 1.71 2.45 1.63

0.06

1.04

1.54

7.62 2.18 3.25

Veloc- Direc-
ity. tion.

WIND VELOCITY (MILES PER HOUR) AND DIRECTION.

NW.
S.

SE.

S.

W.

W.
N.

Date.

16, 1895

24, 1898

3, 1896

24, 1896
1,1897
4, 1896
8, 1899

SNOWFALL.

The only snowfall at the station, one-half inch, occurred March 3, 1896.

August

September..

October
November.
December

a January.

Annual.

MEAN MONTHLY AND ANNUAL TEMPERATURE (FAHRENHEIT).

N.
N.
NW.

Z ZZ

Year 1900. January.. February March

April..

May.

June

July.

8 p. m.

Mean.

Temperature.

Maximum.

O

Minimum.

1899.

In.

In.

In.

29.92 30.15 29.46 47.9 59.8 65.4 43.0 54.2 81

I

January..
February
March

29.91 30.25 29.61 47.8

89

86

April...
May..

June

64.4

92

60.0 67.6 41.1 54.4 86 29.86 30.04 29.56 48.1 57.2 63.9 44.0 54.0 1 29.80 29.98 29.65 48.5 60.6 69.1 43.6 56.4 29.82 29.94 29.72 45.3 58.3 65.8 42.2 54.0 75 29.73 29.90 29.56 52.3 68.3 75.0 49.9 62.4 90 July. 29.72 29.86 29.62 53.6 71.1 77.8 50.9 August... 29.73 29.80 29.64 54.3 67.3 75.4 52.7 I September 29.75 29.88 29.64 | 53.0 68.7 80.8 50.2 October. 29.78 30.02 29.41 50.0 63.8 71.9 47.3 November 29.83 30.00 29.55 51.0 60.3 67.3 47.5 57.4 77 December..... 29.89 30.18 29.70 47.9 59.2 65.7 42.9 54.3 70.5 46.3

64.0

65.5

59.6 96

29.81 30.25 29.41 50.0 62.9

58.4 99

Monthly.

!

၁

Extremes.

Maximum.

Minimum.

Dew

point.

47

8 a. m.

29 38

48

99 44 48

46

1

3338

2543

8 p. m.

8 a. m.

O

49 52 84 59

Relative
humid-

ity.

In.

In.

In.

42 72 54 0.238

25 33 39 60 49

1

41

0.270 5.56 2.36 2.0 3.6 3.5 0.189 0.241 0.28 0.27 1.0 1.7 2.5 0.262 0.295 7.62 2.16 3.9 5.0 5.1 0.269 0.335 1.54 34 41 48 86 68 0.263 0.332 0.10 52 88 59 0.344 0.397 0.92 85 52 0.341 0.388 0.00

44 77 65 42 48 80 6-4

42

49

1.38 1.9 3.1 4.0 0.10 2.6 2.8 3.7 0.92 3.2 1.1 3.4 0.00 8.4 0.5 3.1 0.356 0.391 0.00 0.00 6.9 1.3 3.8 0.342

52

i

0.400 0.00 0.00 4.2 1.0 2.8 0.350 3.92 1.36 2.1 2.0 3.2 73 0.314 0.386 1.94 0.88 3.5 5.4 5.8 2.56 2.1 3.7 3.6 2.56 3.5 2.6 3.7

0.291 4.51. 0.287 0.340 26.39

40 45 49 83 60 0.298

8 p. m.

Pct. Pct. In.

53 86 58

52 83

36 43 48 80

48 80 60

Vapor

pressure.

8 a. m.

44 71 59 0.231

Moisture.

65 0.280

0.343 2.13 0.240 0.303 0.16 37 44 49 80 66 0.292 0.355 2.18

34 39 45 75 58

34 41 45 84 61 0.261

29.88 30.06 29.65 49.1 61.2 66.5 46.0 56.2 80 1.82 3.5 4.2 4.9 29.88 30.08 29.54 46.8 60.9 69.0 43.5 56.2 80 0.16 1.6 2.8 3.2 29.79 30.04 29.61 50.3 61.4 69.4 46.9 58.2 84 2.00 3.7 3.9 4.9 29.79 29.95 29.58 45.8 58.3 64.7 43.6 54.2 80 0.301 0.98 0.54 4.7 3.5 4.5 29.76 29.98 29.58 53.7 64.9 74.6 48.7 61.6 88 42 45 49 75 58 0.301 0.347 1.38 0.92 3.3 2.6 3.0 29.73 29.88 29.58 54.8 68.1 76.5 51.3 63.9 93 45 49 52 82 57 0.347 0.387 0.01 0.01 4.7 2.6 3.9 29.68 29.87 29.55 53.2 70.4 77.0 51.3 64.2 93 87 55 0.356 0.402 T. T. 6.9 1.0 3.9 I August... 29.76 29.95 29.62 57.0 68.2 75.4 54.4 64.9 106 85 60 0.391 0.404 T. 7.2 1.8 5.1 September 29.73 29.90 29.50 56.5 69.2 78.0 50.8 64.4 94 41 49 70 52 0.308 0.359 T. October.. 29.78 30.02 29.56 55.6 64.9 74.5 51.1 62.8 96 43 46 50 74 62 0.323 0.374 1.93 November 29.82 30.01 29.52 49.7 64.1 73.2 46.4 59.8 92 38 43 48 79 60 0.288 0.341 8.01 December..... 29.93 30.05 29.79 47.7 60.6 67.5 43.6 55.6 84 31 38 42 71 54 0.232 0.280 0.26 29.79 30.08 29.50 51.7 64.4 72.2 48.1 60.2 106 78 59 0.302 0.350 17.04

46 50 53
49 52 53

T.

45

T. 3.1 1.4 3.0

I

0.62 3.7 2.8 3.9 4.18 3.0 4.0 4.4 0.26 1.0 2.8 3.1 4.18 3.9 2.8 4.0

in

Maximum

24 hours.

8 a. m.

8 p. m.

Daylight.

December..... 5.1 N. 27

Year