Record envelope, standing records and threshold days for San Jacinto (USC00047810), California, United States, with 86 years of record.
Key Facts for San Jacinto
San Jacinto (USC00047810) is a weather station in California, United States at 33.78 latitude and -116.97 longitude, 470 m (1,542 ft) above sea level.
The station reports from 1893 to 1978, 86 years of record.
1,464 records set at San Jacinto still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
San Jacinto tied a daily record high maximum temperature of 40.0 C (104.0 F) on 29 May 1978.
About the Station
Location: California, United States, 33.78 latitude, -116.97 longitude.
Elevation: 470 m (1,542 ft).
Period of record: 1893 to 1978, 86 years.
Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Jacinto. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Jacinto, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
32.2 C (90.0 F)
-13.9 C (7.0 F)
n/a
n/a
Feb
35.0 C (95.0 F)
-8.9 C (16.0 F)
n/a
n/a
Mar
38.9 C (102.0 F)
-8.3 C (17.1 F)
n/a
n/a
Apr
40.0 C (104.0 F)
-4.4 C (24.1 F)
n/a
n/a
May
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jun
46.7 C (116.1 F)
-0.6 C (30.9 F)
n/a
n/a
Jul
48.9 C (120.0 F)
4.4 C (39.9 F)
n/a
n/a
Aug
46.7 C (116.1 F)
2.8 C (37.0 F)
n/a
n/a
Sep
46.1 C (115.0 F)
2.2 C (36.0 F)
n/a
n/a
Oct
42.2 C (108.0 F)
-4.4 C (24.1 F)
n/a
n/a
Nov
37.2 C (99.0 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
33.3 C (91.9 F)
-8.3 C (17.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Jacinto still stand. 1904 holds the most, with 40.
Standing records at San Jacinto by the year they were set
Year set
Standing records
1893
17
1894
18
1895
18
1896
22
1897
16
1898
16
1899
10
1900
17
1901
17
1902
9
1903
16
1904
40
1905
39
1906
20
1907
13
1908
25
1909
21
1910
22
1911
23
1912
15
1913
21
1914
14
1915
14
1916
33
1917
20
1918
17
1919
17
1920
18
1921
14
1922
14
1923
23
1924
23
1925
16
1926
25
1927
17
1928
20
1929
16
1930
7
1931
13
1932
11
1933
20
1934
22
1935
8
1936
8
1937
13
1938
18
1939
27
1940
11
1941
10
1942
11
1943
3
1944
9
1945
16
1946
7
1947
18
1948
11
1949
19
1950
26
1951
10
1952
19
1953
30
1954
34
1955
22
1956
12
1957
14
1958
14
1959
13
1960
13
1961
17
1962
22
1963
18
1964
21
1965
16
1966
11
1967
26
1968
10
1969
16
1970
14
1971
32
1972
17
1973
11
1974
12
1975
8
1976
12
1977
13
1978
3
All-Time Record Progression
2 new records
2 all-time records were set at San Jacinto between 13 August 1933 and 27 July 1934. Each dot is a new record.
When San Jacinto set new all-time records
Date
Kind
Detail
1933-08-13
Record high minimum temperature
Record high minimum temperature 26.1 C (79.0 F)
1934-07-27
Record high maximum temperature
Record high maximum temperature 48.9 C (120.0 F)
Wettest Day of Each Month
Feb: 85.1 mm (3.4 in)
The wettest day on record for each calendar month at San Jacinto. The most was 85.1 mm (3.4 in) on 16 February 1927.
Record daily precipitation for each month at San Jacinto
Month
Record daily precipitation (mm)
Date
Jan
70.6 mm (2.8 in)
17 January 1916
Feb
85.1 mm (3.4 in)
16 February 1927
Mar
54.6 mm (2.1 in)
2 March 1938
Apr
62.2 mm (2.4 in)
5 April 1926
May
38.6 mm (1.5 in)
8 May 1977
Jun
17.5 mm (0.7 in)
3 June 1932
Jul
23.4 mm (0.9 in)
27 July 1917
Aug
34.8 mm (1.4 in)
18 August 1945
Sep
73.7 mm (2.9 in)
19 September 1939
Oct
73.7 mm (2.9 in)
14 October 1897
Nov
54.9 mm (2.2 in)
12 November 1944
Dec
78.7 mm (3.1 in)
20 December 1921
Period of Record Coverage
1893 to 1978
Complete yearUnder 90 percent of days
86 years of record at San Jacinto, 1893 to 1978. 6 years have data for under 90 percent of days and are left out of rankings: 1897, 1898, 1899, 1904, 1948, 1978.
Cooler than the station meanWarmer than the station mean
One stripe for each of 72 complete years at San Jacinto, 1893 to 1977. Blue stripes are years cooler than the station's own mean of 17.1 C (62.7 F); red stripes are warmer. The coolest year was 1954, at 15.5 C (59.9 F), and the warmest was 1934, at 18.7 C (65.6 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at San Jacinto as warming stripes, 1893 to 1977
Year
Annual mean temperature
Difference from the station mean
1893
16.0 C
-1.10 C
1894
16.3 C
-0.77 C
1896
16.8 C
-0.33 C
1900
17.2 C
+0.09 C
1901
17.1 C
+0.01 C
1902
16.5 C
-0.59 C
1906
17.4 C
+0.31 C
1907
17.2 C
+0.12 C
1909
17.2 C
+0.09 C
1910
18.3 C
+1.24 C
1911
17.2 C
+0.11 C
1912
16.8 C
-0.26 C
1913
17.2 C
+0.16 C
1914
17.5 C
+0.42 C
1915
16.9 C
-0.19 C
1916
17.9 C
+0.79 C
1917
17.8 C
+0.69 C
1918
17.5 C
+0.38 C
1919
17.2 C
+0.15 C
1920
16.4 C
-0.67 C
1921
16.6 C
-0.44 C
1922
16.7 C
-0.37 C
1923
16.4 C
-0.68 C
1924
17.1 C
-0.03 C
1925
16.6 C
-0.44 C
1926
17.8 C
+0.74 C
1927
17.4 C
+0.36 C
1928
17.6 C
+0.54 C
1929
17.5 C
+0.40 C
1930
16.9 C
-0.21 C
1931
18.1 C
+0.98 C
1932
16.9 C
-0.17 C
1933
17.0 C
-0.12 C
1934
18.7 C
+1.59 C
1935
17.1 C
+0.01 C
1936
18.0 C
+0.96 C
1937
17.7 C
+0.63 C
1940
17.5 C
+0.43 C
1941
16.3 C
-0.75 C
1942
16.7 C
-0.40 C
1943
17.2 C
+0.11 C
1944
15.7 C
-1.34 C
1945
16.5 C
-0.54 C
1947
17.1 C
+0.06 C
1950
17.3 C
+0.23 C
1951
16.4 C
-0.66 C
1952
15.6 C
-1.47 C
1953
15.8 C
-1.33 C
1954
15.5 C
-1.58 C
1955
16.0 C
-1.07 C
1956
16.6 C
-0.52 C
1957
16.7 C
-0.34 C
1958
17.3 C
+0.22 C
1959
17.8 C
+0.68 C
1960
17.4 C
+0.36 C
1961
17.6 C
+0.47 C
1962
17.2 C
+0.11 C
1963
17.2 C
+0.13 C
1964
16.7 C
-0.37 C
1965
17.0 C
-0.07 C
1966
17.4 C
+0.30 C
1967
17.3 C
+0.23 C
1968
18.0 C
+0.92 C
1969
17.7 C
+0.61 C
1970
17.4 C
+0.36 C
1971
16.9 C
-0.14 C
1972
17.7 C
+0.62 C
1973
16.9 C
-0.18 C
1974
17.5 C
+0.42 C
1975
16.5 C
-0.58 C
1976
17.1 C
+0.06 C
1977
17.8 C
+0.74 C
The fitted trend in annual mean temperature here over 1893 to 1977 is 0.01 C (-0.05 to 0.07) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.02 F (-0.09 to 0.13) per decade. The slope is a straight line fitted to 72 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Jacinto
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.01 C (-0.05 to 0.07) per decade
0.02 F (-0.09 to 0.13) per decade
1893 to 1977
72
Not clearly different from zero
Mean daily maximum
0.11 C (0.02 to 0.20) per decade
0.20 F (0.04 to 0.36) per decade
1893 to 1977
72
Rise
Mean daily minimum
-0.09 C (-0.17 to -0.01) per decade
-0.16 F (-0.31 to -0.02) per decade
1893 to 1977
72
Fall
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1893 to 1978
Yearly extremes at San Jacinto: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
48.9 C (120.0 F)
1934
43.3 C (109.9 F)
86
Coldest night (TNn)
-13.9 C (7.0 F)
1913
-5.8 C (21.5 F)
86
Wettest day (Rx1day)
85.1 mm (3.4 in)
1927
39.1 mm (1.5 in)
86
Wettest five days (Rx5day)
222.3 mm (8.8 in)
1927
70.4 mm (2.8 in)
86
Longest dry spell (CDD)
208 days
1926
87 days
86
Hottest day (TXx)
The hottest day of the year at San Jacinto, 1893 to 1978. The record is 48.9 C (120.0 F) in 1934, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at San Jacinto by year
Year
Hottest day (TXx)
1893
39.4 C (102.9 F)
1894
40.6 C (105.1 F)
1895
39.4 C (102.9 F)
1896
43.9 C (111.0 F)
1897
35.0 C (95.0 F)
1898
43.3 C (109.9 F)
1899
42.8 C (109.0 F)
1900
43.3 C (109.9 F)
1901
42.8 C (109.0 F)
1902
44.4 C (111.9 F)
1903
42.2 C (108.0 F)
1904
37.2 C (99.0 F)
1905
42.8 C (109.0 F)
1906
41.1 C (106.0 F)
1907
43.9 C (111.0 F)
1908
42.2 C (108.0 F)
1909
40.6 C (105.1 F)
1910
42.2 C (108.0 F)
1911
41.1 C (106.0 F)
1912
40.0 C (104.0 F)
1913
42.8 C (109.0 F)
1914
40.6 C (105.1 F)
1915
42.2 C (108.0 F)
1916
43.3 C (109.9 F)
1917
46.1 C (115.0 F)
1918
42.8 C (109.0 F)
1919
41.7 C (107.1 F)
1920
42.2 C (108.0 F)
1921
42.8 C (109.0 F)
1922
41.1 C (106.0 F)
1923
42.8 C (109.0 F)
1924
41.7 C (107.1 F)
1925
43.3 C (109.9 F)
1926
45.6 C (114.1 F)
1927
44.4 C (111.9 F)
1928
44.4 C (111.9 F)
1929
45.0 C (113.0 F)
1930
42.2 C (108.0 F)
1931
42.8 C (109.0 F)
1932
42.8 C (109.0 F)
1933
45.6 C (114.1 F)
1934
48.9 C (120.0 F)
1935
42.2 C (108.0 F)
1936
45.6 C (114.1 F)
1937
43.9 C (111.0 F)
1938
46.7 C (116.1 F)
1939
43.9 C (111.0 F)
1940
43.3 C (109.9 F)
1941
42.2 C (108.0 F)
1942
43.3 C (109.9 F)
1943
44.4 C (111.9 F)
1944
42.8 C (109.0 F)
1945
41.1 C (106.0 F)
1946
41.1 C (106.0 F)
1947
43.9 C (111.0 F)
1948
42.2 C (108.0 F)
1949
42.8 C (109.0 F)
1950
45.6 C (114.1 F)
1951
43.3 C (109.9 F)
1952
41.7 C (107.1 F)
1953
43.3 C (109.9 F)
1954
42.2 C (108.0 F)
1955
46.1 C (115.0 F)
1956
42.8 C (109.0 F)
1957
43.9 C (111.0 F)
1958
43.9 C (111.0 F)
1959
45.0 C (113.0 F)
1960
46.7 C (116.1 F)
1961
46.7 C (116.1 F)
1962
45.0 C (113.0 F)
1963
43.3 C (109.9 F)
1964
43.9 C (111.0 F)
1965
44.4 C (111.9 F)
1966
42.8 C (109.0 F)
1967
45.6 C (114.1 F)
1968
43.3 C (109.9 F)
1969
44.4 C (111.9 F)
1970
43.9 C (111.0 F)
1971
46.1 C (115.0 F)
1972
45.0 C (113.0 F)
1973
46.7 C (116.1 F)
1974
44.4 C (111.9 F)
1975
43.9 C (111.0 F)
1976
43.9 C (111.0 F)
1977
43.3 C (109.9 F)
1978
40.0 C (104.0 F)
Coldest night (TNn)
The coldest night of the year at San Jacinto, 1893 to 1978. The record is -13.9 C (7.0 F) in 1913, marked on the chart; the median year is -5.8 C (21.5 F).
Coldest night (TNn) at San Jacinto by year
Year
Coldest night (TNn)
1893
-3.9 C (25.0 F)
1894
-6.7 C (19.9 F)
1895
-7.2 C (19.0 F)
1896
-4.4 C (24.1 F)
1897
-6.7 C (19.9 F)
1898
-5.6 C (21.9 F)
1899
-7.2 C (19.0 F)
1900
-3.3 C (26.1 F)
1901
-6.1 C (21.0 F)
1902
-3.9 C (25.0 F)
1903
-5.6 C (21.9 F)
1904
-4.4 C (24.1 F)
1905
-5.6 C (21.9 F)
1906
-5.0 C (23.0 F)
1907
-7.8 C (18.0 F)
1908
-6.1 C (21.0 F)
1909
-6.7 C (19.9 F)
1910
-4.4 C (24.1 F)
1911
-6.7 C (19.9 F)
1912
-3.9 C (25.0 F)
1913
-13.9 C (7.0 F)
1914
-2.2 C (28.0 F)
1915
-4.4 C (24.1 F)
1916
-6.1 C (21.0 F)
1917
-3.9 C (25.0 F)
1918
-6.1 C (21.0 F)
1919
-6.7 C (19.9 F)
1920
-3.3 C (26.1 F)
1921
-3.9 C (25.0 F)
1922
-6.1 C (21.0 F)
1923
-3.3 C (26.1 F)
1924
-5.6 C (21.9 F)
1925
-4.4 C (24.1 F)
1926
-6.7 C (19.9 F)
1927
-4.4 C (24.1 F)
1928
-4.4 C (24.1 F)
1929
-5.6 C (21.9 F)
1930
-3.9 C (25.0 F)
1931
-3.9 C (25.0 F)
1932
-4.4 C (24.1 F)
1933
-3.3 C (26.1 F)
1934
-3.3 C (26.1 F)
1935
-3.9 C (25.0 F)
1936
-3.9 C (25.0 F)
1937
-8.9 C (16.0 F)
1938
-6.7 C (19.9 F)
1939
-5.6 C (21.9 F)
1940
-3.9 C (25.0 F)
1941
-3.3 C (26.1 F)
1942
-5.0 C (23.0 F)
1943
-4.4 C (24.1 F)
1944
-2.8 C (27.0 F)
1945
-7.8 C (18.0 F)
1946
-4.4 C (24.1 F)
1947
-6.7 C (19.9 F)
1948
-6.1 C (21.0 F)
1949
-7.8 C (18.0 F)
1950
-6.7 C (19.9 F)
1951
-7.2 C (19.0 F)
1952
-6.7 C (19.9 F)
1953
-8.9 C (16.0 F)
1954
-8.3 C (17.1 F)
1955
-7.2 C (19.0 F)
1956
-6.1 C (21.0 F)
1957
-3.9 C (25.0 F)
1958
-7.2 C (19.0 F)
1959
-3.3 C (26.1 F)
1960
-7.2 C (19.0 F)
1961
-5.6 C (21.9 F)
1962
-7.8 C (18.0 F)
1963
-8.3 C (17.1 F)
1964
-6.7 C (19.9 F)
1965
-6.7 C (19.9 F)
1966
-5.6 C (21.9 F)
1967
-5.0 C (23.0 F)
1968
-6.7 C (19.9 F)
1969
-6.7 C (19.9 F)
1970
-8.3 C (17.1 F)
1971
-8.3 C (17.1 F)
1972
-6.7 C (19.9 F)
1973
-6.1 C (21.0 F)
1974
-7.2 C (19.0 F)
1975
-6.1 C (21.0 F)
1976
-7.8 C (18.0 F)
1977
-3.9 C (25.0 F)
1978
-3.3 C (26.1 F)
Wettest day (Rx1day)
The wettest day of the year at San Jacinto, 1893 to 1978. The record is 85.1 mm (3.4 in) in 1927, marked on the chart; the median year is 39.1 mm (1.5 in).
Wettest day (Rx1day) at San Jacinto by year
Year
Wettest day (Rx1day)
1893
54.1 mm (2.1 in)
1894
41.1 mm (1.6 in)
1895
52.1 mm (2.1 in)
1896
47.8 mm (1.9 in)
1897
73.7 mm (2.9 in)
1898
26.7 mm (1.1 in)
1899
43.2 mm (1.7 in)
1900
44.5 mm (1.8 in)
1901
31.0 mm (1.2 in)
1902
22.1 mm (0.9 in)
1903
44.5 mm (1.8 in)
1904
50.8 mm (2.0 in)
1905
62.7 mm (2.5 in)
1906
43.2 mm (1.7 in)
1907
27.9 mm (1.1 in)
1908
24.1 mm (0.9 in)
1909
36.1 mm (1.4 in)
1910
47.0 mm (1.9 in)
1911
36.3 mm (1.4 in)
1912
32.0 mm (1.3 in)
1913
28.4 mm (1.1 in)
1914
53.8 mm (2.1 in)
1915
50.8 mm (2.0 in)
1916
70.6 mm (2.8 in)
1917
37.1 mm (1.5 in)
1918
52.3 mm (2.1 in)
1919
22.9 mm (0.9 in)
1920
25.9 mm (1.0 in)
1921
78.7 mm (3.1 in)
1922
34.0 mm (1.3 in)
1923
25.9 mm (1.0 in)
1924
33.0 mm (1.3 in)
1925
38.1 mm (1.5 in)
1926
62.2 mm (2.4 in)
1927
85.1 mm (3.4 in)
1928
32.3 mm (1.3 in)
1929
33.0 mm (1.3 in)
1930
33.0 mm (1.3 in)
1931
43.2 mm (1.7 in)
1932
46.2 mm (1.8 in)
1933
34.0 mm (1.3 in)
1934
27.9 mm (1.1 in)
1935
25.1 mm (1.0 in)
1936
36.8 mm (1.4 in)
1937
71.1 mm (2.8 in)
1938
54.6 mm (2.1 in)
1939
73.7 mm (2.9 in)
1940
66.5 mm (2.6 in)
1941
52.1 mm (2.1 in)
1942
26.2 mm (1.0 in)
1943
67.8 mm (2.7 in)
1944
54.9 mm (2.2 in)
1945
67.3 mm (2.6 in)
1946
22.9 mm (0.9 in)
1947
44.2 mm (1.7 in)
1948
25.4 mm (1.0 in)
1949
31.0 mm (1.2 in)
1950
18.8 mm (0.7 in)
1951
55.1 mm (2.2 in)
1952
41.4 mm (1.6 in)
1953
19.8 mm (0.8 in)
1954
39.6 mm (1.6 in)
1955
31.2 mm (1.2 in)
1956
44.5 mm (1.8 in)
1957
32.3 mm (1.3 in)
1958
54.1 mm (2.1 in)
1959
33.0 mm (1.3 in)
1960
24.4 mm (1.0 in)
1961
32.0 mm (1.3 in)
1962
23.4 mm (0.9 in)
1963
53.8 mm (2.1 in)
1964
24.4 mm (1.0 in)
1965
53.6 mm (2.1 in)
1966
54.6 mm (2.1 in)
1967
39.6 mm (1.6 in)
1968
26.4 mm (1.0 in)
1969
50.5 mm (2.0 in)
1970
50.8 mm (2.0 in)
1971
24.1 mm (0.9 in)
1972
27.4 mm (1.1 in)
1973
27.9 mm (1.1 in)
1974
38.4 mm (1.5 in)
1975
31.5 mm (1.2 in)
1976
44.2 mm (1.7 in)
1977
38.6 mm (1.5 in)
1978
46.2 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Jacinto, 1893 to 1978. The record is 222.3 mm (8.8 in) in 1927, marked on the chart; the median year is 70.4 mm (2.8 in).
Wettest five days (Rx5day) at San Jacinto by year
Year
Wettest five days (Rx5day)
1893
80.3 mm (3.2 in)
1894
53.1 mm (2.1 in)
1895
146.4 mm (5.8 in)
1896
65.3 mm (2.6 in)
1897
78.6 mm (3.1 in)
1898
49.0 mm (1.9 in)
1899
53.4 mm (2.1 in)
1900
76.4 mm (3.0 in)
1901
89.7 mm (3.5 in)
1902
36.8 mm (1.4 in)
1903
63.1 mm (2.5 in)
1904
52.8 mm (2.1 in)
1905
92.9 mm (3.7 in)
1906
82.3 mm (3.2 in)
1907
60.0 mm (2.4 in)
1908
66.3 mm (2.6 in)
1909
57.9 mm (2.3 in)
1910
74.6 mm (2.9 in)
1911
51.3 mm (2.0 in)
1912
76.0 mm (3.0 in)
1913
45.0 mm (1.8 in)
1914
97.5 mm (3.8 in)
1915
101.7 mm (4.0 in)
1916
145.7 mm (5.7 in)
1917
6.1 mm (0.24 in)
1918
115.3 mm (4.5 in)
1919
32.8 mm (1.3 in)
1920
66.1 mm (2.6 in)
1921
177.8 mm (7.0 in)
1922
50.0 mm (2.0 in)
1923
24.6 mm (1.0 in)
1924
52.4 mm (2.1 in)
1925
20.3 mm (0.8 in)
1926
137.1 mm (5.4 in)
1927
222.3 mm (8.8 in)
1928
40.0 mm (1.6 in)
1929
39.4 mm (1.6 in)
1930
80.8 mm (3.2 in)
1931
60.9 mm (2.4 in)
1932
83.3 mm (3.3 in)
1933
65.0 mm (2.6 in)
1934
71.1 mm (2.8 in)
1935
70.5 mm (2.8 in)
1936
101.6 mm (4.0 in)
1937
88.9 mm (3.5 in)
1938
146.0 mm (5.7 in)
1939
73.7 mm (2.9 in)
1940
83.0 mm (3.3 in)
1941
88.1 mm (3.5 in)
1942
52.8 mm (2.1 in)
1943
130.8 mm (5.1 in)
1944
81.6 mm (3.2 in)
1945
104.4 mm (4.1 in)
1946
55.1 mm (2.2 in)
1947
70.2 mm (2.8 in)
1948
41.6 mm (1.6 in)
1949
31.5 mm (1.2 in)
1950
24.2 mm (1.0 in)
1951
85.9 mm (3.4 in)
1952
103.3 mm (4.1 in)
1953
23.7 mm (0.9 in)
1954
72.8 mm (2.9 in)
1955
44.0 mm (1.7 in)
1956
82.1 mm (3.2 in)
1957
57.4 mm (2.3 in)
1958
70.4 mm (2.8 in)
1959
70.4 mm (2.8 in)
1960
54.1 mm (2.1 in)
1961
37.1 mm (1.5 in)
1962
43.7 mm (1.7 in)
1963
68.3 mm (2.7 in)
1964
41.7 mm (1.6 in)
1965
106.2 mm (4.2 in)
1966
115.0 mm (4.5 in)
1967
61.2 mm (2.4 in)
1968
32.2 mm (1.3 in)
1969
103.1 mm (4.1 in)
1970
94.5 mm (3.7 in)
1971
76.8 mm (3.0 in)
1972
38.9 mm (1.5 in)
1973
50.9 mm (2.0 in)
1974
116.2 mm (4.6 in)
1975
74.4 mm (2.9 in)
1976
94.3 mm (3.7 in)
1977
67.7 mm (2.7 in)
1978
123.9 mm (4.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Jacinto, 1893 to 1978. The record is 208 days in 1926, marked on the chart; the median year is 87 days.
Longest dry spell (CDD) at San Jacinto by year
Year
Longest dry spell (CDD)
1893
110 days
1894
73 days
1895
103 days
1896
51 days
1897
30 days
1898
49 days
1899
40 days
1900
81 days
1901
90 days
1902
89 days
1903
118 days
1904
56 days
1905
91 days
1906
83 days
1907
184 days
1908
98 days
1909
70 days
1910
125 days
1911
154 days
1912
109 days
1913
77 days
1914
135 days
1915
52 days
1916
24 days
1917
13 days
1918
22 days
1919
33 days
1920
8 days
1921
27 days
1922
1 day
1923
18 days
1924
37 days
1925
30 days
1926
208 days
1927
91 days
1928
154 days
1929
104 days
1930
84 days
1931
60 days
1932
109 days
1933
77 days
1934
73 days
1935
99 days
1936
167 days
1937
194 days
1938
148 days
1939
113 days
1940
181 days
1941
62 days
1942
101 days
1943
176 days
1944
155 days
1945
113 days
1946
68 days
1947
71 days
1948
76 days
1949
152 days
1950
193 days
1951
64 days
1952
86 days
1953
87 days
1954
109 days
1955
92 days
1956
99 days
1957
91 days
1958
78 days
1959
102 days
1960
84 days
1961
135 days
1962
98 days
1963
56 days
1964
140 days
1965
68 days
1966
173 days
1967
81 days
1968
57 days
1969
83 days
1970
120 days
1971
126 days
1972
66 days
1973
160 days
1974
111 days
1975
68 days
1976
45 days
1977
80 days
1978
36 days
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
72 years with a frost
Across 72 years with a frost, the median last spring frost at San Jacinto falls on 27 March and the median first autumn frost on 18 November, which leaves a median of 238 days between them.
In 1945 to 1977 the median growing season was 224 days. That is 24 days fewer than in 1893 to 1930.
Fitted over all years, the growing season changes by -3.2 days per decade at this station.
Frost dates and growing season at San Jacinto
Measure
Median, all years
Earliest period (1893 to 1930)
Recent period (1945 to 1977)
Recent against earliest
Fitted trend
Last spring frost
27 March
27 March
1 April
5 days later
+1.8 days per decade
First autumn frost
18 November
19 November
15 November
4 days earlier
-1.3 days per decade
Growing days
238 days
248 days
224 days
24 days fewer
-3.2 days per decade
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
67 years, 1893 to 1977
A day with at least 38.9 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 88.1 mm (3.5 in) of rain is expected about once in 100 years.
Rainfall return levels at San Jacinto: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
38.9 mm (1.5 in)
5 years
52.6 mm (2.1 in)
10 years
61.4 mm (2.4 in)
25 years
72.4 mm (2.9 in)
50 years
80.4 mm (3.2 in)
100 years
88.1 mm (3.5 in)
Longer than the 67 years of record
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 67 years of values from 1893 to 1977.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 85.1 mm (3.4 in) in 1927; 73.7 mm (2.9 in) in 1939; 71.1 mm (2.8 in) in 1937.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for San Jacinto standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Jacinto threshold days by year: CSV or JSON. Field meanings are on the data page.
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-14 (14 October 2026). Records are computed by this site and are not official.