Record envelope, standing records and threshold days for West Branch (USC00049540), California, United States, with 46 years of record.
Key Facts for West Branch
West Branch (USC00049540) is a weather station in California, United States at 39.93 latitude and -121.53 longitude, 982 m (3,222 ft) above sea level.
The station reports from 1907 to 1952, 46 years of record.
1,464 records set at West Branch still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
West Branch set a daily record high maximum temperature of 32.8 C (91.0 F) on 30 September 1952.
About the Station
Location: California, United States, 39.93 latitude, -121.53 longitude.
Elevation: 982 m (3,222 ft).
Period of record: 1907 to 1952, 46 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 West Branch. 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 West Branch, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-19.4 C (-2.9 F)
n/a
n/a
Feb
24.4 C (75.9 F)
-13.9 C (7.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-12.2 C (10.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-10.6 C (12.9 F)
n/a
n/a
May
39.4 C (102.9 F)
-5.0 C (23.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-5.6 C (21.9 F)
n/a
n/a
Jul
41.1 C (106.0 F)
0.6 C (33.1 F)
n/a
n/a
Aug
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
Sep
39.4 C (102.9 F)
-2.2 C (28.0 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-8.9 C (16.0 F)
n/a
n/a
Dec
25.6 C (78.1 F)
-15.0 C (5.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at West Branch still stand. 1910 holds the most, with 63.
Standing records at West Branch by the year they were set
Year set
Standing records
1907
38
1908
53
1909
44
1910
63
1911
34
1912
43
1913
59
1914
31
1915
15
1916
50
1917
45
1918
37
1919
44
1920
44
1921
24
1922
36
1923
28
1924
38
1925
41
1926
32
1927
27
1928
32
1929
45
1930
32
1931
36
1932
36
1933
39
1934
29
1935
23
1936
32
1937
22
1938
16
1939
32
1940
24
1941
23
1942
16
1943
22
1944
19
1945
16
1946
9
1947
25
1948
36
1949
15
1950
30
1951
20
1952
9
All-Time Record Progression
3 new records
3 all-time records were set at West Branch between 8 January 1937 and 20 January 1937. Each dot is a new record.
When West Branch set new all-time records
Date
Kind
Detail
1937-01-08
Record low minimum temperature
Record low minimum temperature -17.2 C (1.0 F)
1937-01-20
Record low maximum temperature
Record low maximum temperature -5.0 C (23.0 F)
1937-01-20
Record low minimum temperature
Record low minimum temperature -19.4 C (-2.9 F)
Wettest Day of Each Month
Dec: 254.0 mm (10.0 in)
The wettest day on record for each calendar month at West Branch. The most was 254.0 mm (10.0 in) on 31 December 1913.
Record daily precipitation for each month at West Branch
Month
Record daily precipitation (mm)
Date
Jan
188.7 mm (7.4 in)
8 January 1909
Feb
170.9 mm (6.7 in)
27 February 1940
Mar
189.7 mm (7.5 in)
18 March 1907
Apr
158.2 mm (6.2 in)
5 April 1911
May
94.0 mm (3.7 in)
9 May 1915
Jun
69.9 mm (2.8 in)
16 June 1937
Jul
37.6 mm (1.5 in)
1 July 1916
Aug
55.9 mm (2.2 in)
29 August 1923
Sep
122.9 mm (4.8 in)
6 September 1912
Oct
130.3 mm (5.1 in)
16 October 1947
Nov
152.4 mm (6.0 in)
9 November 1927
Dec
254.0 mm (10.0 in)
31 December 1913
Period of Record Coverage
1907 to 1952
Complete yearUnder 90 percent of days
46 years of record at West Branch, 1907 to 1952. 11 years have data for under 90 percent of days and are left out of rankings: 1907, 1932, 1941, 1944, 1945, 1946, 1948, 1949 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at West Branch, 1908 to 1947. Blue stripes are years cooler than the station's own mean of 10.9 C (51.6 F); red stripes are warmer. The coolest year was 1922, at 9.8 C (49.6 F), and the warmest was 1910, at 12.4 C (54.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at West Branch as warming stripes, 1908 to 1947
Year
Annual mean temperature
Difference from the station mean
1908
11.4 C
+0.55 C
1910
12.4 C
+1.53 C
1912
10.7 C
-0.23 C
1913
11.1 C
+0.23 C
1914
11.7 C
+0.82 C
1915
11.1 C
+0.23 C
1916
10.4 C
-0.49 C
1917
11.3 C
+0.39 C
1918
10.8 C
-0.11 C
1919
10.5 C
-0.43 C
1920
10.1 C
-0.79 C
1921
10.5 C
-0.37 C
1922
9.8 C
-1.11 C
1923
10.3 C
-0.62 C
1924
10.9 C
-0.02 C
1925
10.6 C
-0.34 C
1926
11.6 C
+0.74 C
1927
10.1 C
-0.75 C
1928
11.0 C
+0.08 C
1929
10.9 C
+0.04 C
1930
10.6 C
-0.28 C
1931
11.4 C
+0.46 C
1933
10.5 C
-0.38 C
1934
12.0 C
+1.14 C
1936
11.5 C
+0.60 C
1937
10.0 C
-0.93 C
1938
10.6 C
-0.25 C
1939
11.5 C
+0.56 C
1943
10.8 C
-0.10 C
1946
10.7 C
-0.18 C
1947
10.9 C
+0.02 C
The fitted trend in annual mean temperature here over 1908 to 1947 is -0.1 C (-0.3 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.5 to 0.3) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at West Branch
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.3 to 0.1) per decade
-0.1 F (-0.5 to 0.3) per decade
1908 to 1947
31
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.4 to 0.2) per decade
-0.1 F (-0.7 to 0.4) per decade
1908 to 1947
31
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1908 to 1947
31
Not clearly different from zero
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
1907 to 1952
Yearly extremes at West Branch: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1908
36.7 C (98.1 F)
46
Coldest night (TNn)
-19.4 C (-2.9 F)
1937
-10.6 C (12.9 F)
46
Wettest day (Rx1day)
254.0 mm (10.0 in)
1913
124.4 mm (4.9 in)
46
Wettest five days (Rx5day)
596.1 mm (23.5 in)
1929
273.0 mm (10.7 in)
46
Longest dry spell (CDD)
135 days
1942
73 days
46
Hottest day (TXx)
The hottest day of the year at West Branch, 1907 to 1952. The record is 41.1 C (106.0 F) in 1908, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at West Branch by year
Year
Hottest day (TXx)
1907
38.9 C (102.0 F)
1908
41.1 C (106.0 F)
1909
38.3 C (100.9 F)
1910
40.0 C (104.0 F)
1911
40.0 C (104.0 F)
1912
39.4 C (102.9 F)
1913
38.3 C (100.9 F)
1914
37.8 C (100.0 F)
1915
40.0 C (104.0 F)
1916
38.9 C (102.0 F)
1917
36.7 C (98.1 F)
1918
36.1 C (97.0 F)
1919
38.3 C (100.9 F)
1920
36.7 C (98.1 F)
1921
33.3 C (91.9 F)
1922
36.1 C (97.0 F)
1923
36.7 C (98.1 F)
1924
36.7 C (98.1 F)
1925
37.8 C (100.0 F)
1926
37.2 C (99.0 F)
1927
35.0 C (95.0 F)
1928
36.7 C (98.1 F)
1929
36.7 C (98.1 F)
1930
35.6 C (96.1 F)
1931
37.8 C (100.0 F)
1932
36.1 C (97.0 F)
1933
38.9 C (102.0 F)
1934
36.7 C (98.1 F)
1935
36.7 C (98.1 F)
1936
36.1 C (97.0 F)
1937
37.2 C (99.0 F)
1938
37.2 C (99.0 F)
1939
36.7 C (98.1 F)
1940
36.1 C (97.0 F)
1941
32.8 C (91.0 F)
1942
36.1 C (97.0 F)
1943
34.4 C (93.9 F)
1944
35.0 C (95.0 F)
1945
36.7 C (98.1 F)
1946
36.7 C (98.1 F)
1947
34.4 C (93.9 F)
1948
34.4 C (93.9 F)
1949
33.3 C (91.9 F)
1950
37.8 C (100.0 F)
1951
35.6 C (96.1 F)
1952
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at West Branch, 1907 to 1952. The record is -19.4 C (-2.9 F) in 1937, marked on the chart; the median year is -10.6 C (12.9 F).
Coldest night (TNn) at West Branch by year
Year
Coldest night (TNn)
1907
-7.8 C (18.0 F)
1908
-10.6 C (12.9 F)
1909
-8.3 C (17.1 F)
1910
-13.3 C (8.1 F)
1911
-11.1 C (12.0 F)
1912
-10.0 C (14.0 F)
1913
-12.8 C (9.0 F)
1914
-10.0 C (14.0 F)
1915
-10.6 C (12.9 F)
1916
-11.7 C (10.9 F)
1917
-10.0 C (14.0 F)
1918
-10.0 C (14.0 F)
1919
-12.2 C (10.0 F)
1920
-8.3 C (17.1 F)
1921
-8.9 C (16.0 F)
1922
-11.7 C (10.9 F)
1923
-11.7 C (10.9 F)
1924
-13.3 C (8.1 F)
1925
-7.2 C (19.0 F)
1926
-10.0 C (14.0 F)
1927
-7.8 C (18.0 F)
1928
-9.4 C (15.1 F)
1929
-12.2 C (10.0 F)
1930
-14.4 C (6.1 F)
1931
-11.1 C (12.0 F)
1932
-15.0 C (5.0 F)
1933
-12.2 C (10.0 F)
1934
-5.6 C (21.9 F)
1935
-13.9 C (7.0 F)
1936
-8.9 C (16.0 F)
1937
-19.4 C (-2.9 F)
1938
-8.9 C (16.0 F)
1939
-11.7 C (10.9 F)
1940
-11.7 C (10.9 F)
1941
-8.9 C (16.0 F)
1942
-9.4 C (15.1 F)
1943
-13.9 C (7.0 F)
1944
-7.2 C (19.0 F)
1945
-8.3 C (17.1 F)
1946
-9.4 C (15.1 F)
1947
-10.6 C (12.9 F)
1948
-10.0 C (14.0 F)
1949
-13.9 C (7.0 F)
1950
-18.9 C (-2.0 F)
1951
-12.2 C (10.0 F)
1952
-10.0 C (14.0 F)
Wettest day (Rx1day)
The wettest day of the year at West Branch, 1907 to 1952. The record is 254.0 mm (10.0 in) in 1913, marked on the chart; the median year is 124.4 mm (4.9 in).
Wettest day (Rx1day) at West Branch by year
Year
Wettest day (Rx1day)
1907
189.7 mm (7.5 in)
1908
65.8 mm (2.6 in)
1909
188.7 mm (7.4 in)
1910
77.2 mm (3.0 in)
1911
158.2 mm (6.2 in)
1912
139.2 mm (5.5 in)
1913
254.0 mm (10.0 in)
1914
125.0 mm (4.9 in)
1915
125.7 mm (4.9 in)
1916
163.1 mm (6.4 in)
1917
163.1 mm (6.4 in)
1918
110.2 mm (4.3 in)
1919
101.6 mm (4.0 in)
1920
130.8 mm (5.1 in)
1921
128.5 mm (5.1 in)
1922
134.6 mm (5.3 in)
1923
57.9 mm (2.3 in)
1924
128.3 mm (5.1 in)
1925
115.8 mm (4.6 in)
1926
144.5 mm (5.7 in)
1927
152.4 mm (6.0 in)
1928
122.7 mm (4.8 in)
1929
139.7 mm (5.5 in)
1930
91.4 mm (3.6 in)
1931
97.5 mm (3.8 in)
1932
59.7 mm (2.4 in)
1933
106.4 mm (4.2 in)
1934
80.5 mm (3.2 in)
1935
102.1 mm (4.0 in)
1936
121.9 mm (4.8 in)
1937
203.2 mm (8.0 in)
1938
99.8 mm (3.9 in)
1939
77.7 mm (3.1 in)
1940
170.9 mm (6.7 in)
1941
126.2 mm (5.0 in)
1942
126.0 mm (5.0 in)
1943
162.1 mm (6.4 in)
1944
121.7 mm (4.8 in)
1945
123.7 mm (4.9 in)
1946
135.1 mm (5.3 in)
1947
147.3 mm (5.8 in)
1948
122.2 mm (4.8 in)
1949
65.8 mm (2.6 in)
1950
118.1 mm (4.6 in)
1951
89.4 mm (3.5 in)
1952
92.5 mm (3.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at West Branch, 1907 to 1952. The record is 596.1 mm (23.5 in) in 1929, marked on the chart; the median year is 273.0 mm (10.7 in).
Wettest five days (Rx5day) at West Branch by year
Year
Wettest five days (Rx5day)
1907
578.4 mm (22.8 in)
1908
158.0 mm (6.2 in)
1909
590.3 mm (23.2 in)
1910
143.7 mm (5.7 in)
1911
298.1 mm (11.7 in)
1912
236.9 mm (9.3 in)
1913
361.9 mm (14.2 in)
1914
491.4 mm (19.3 in)
1915
300.4 mm (11.8 in)
1916
256.3 mm (10.1 in)
1917
400.5 mm (15.8 in)
1918
154.4 mm (6.1 in)
1919
301.2 mm (11.9 in)
1920
354.0 mm (13.9 in)
1921
268.2 mm (10.6 in)
1922
233.0 mm (9.2 in)
1923
154.7 mm (6.1 in)
1924
218.5 mm (8.6 in)
1925
280.9 mm (11.1 in)
1926
375.0 mm (14.8 in)
1927
279.4 mm (11.0 in)
1928
430.8 mm (17.0 in)
1929
596.1 mm (23.5 in)
1930
132.8 mm (5.2 in)
1931
247.3 mm (9.7 in)
1932
114.8 mm (4.5 in)
1933
199.8 mm (7.9 in)
1934
244.5 mm (9.6 in)
1935
218.9 mm (8.6 in)
1936
320.1 mm (12.6 in)
1937
424.1 mm (16.7 in)
1938
331.8 mm (13.1 in)
1939
213.7 mm (8.4 in)
1940
455.3 mm (17.9 in)
1941
393.6 mm (15.5 in)
1942
360.2 mm (14.2 in)
1943
428.3 mm (16.9 in)
1944
235.5 mm (9.3 in)
1945
381.0 mm (15.0 in)
1946
277.8 mm (10.9 in)
1947
214.9 mm (8.5 in)
1948
251.5 mm (9.9 in)
1949
174.5 mm (6.9 in)
1950
222.0 mm (8.7 in)
1951
134.1 mm (5.3 in)
1952
201.6 mm (7.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at West Branch, 1907 to 1952. The record is 135 days in 1942, marked on the chart; the median year is 73 days.
Longest dry spell (CDD) at West Branch by year
Year
Longest dry spell (CDD)
1907
17 days
1908
28 days
1909
43 days
1910
35 days
1911
31 days
1912
71 days
1913
64 days
1914
74 days
1915
108 days
1916
41 days
1917
44 days
1918
108 days
1919
133 days
1920
56 days
1921
25 days
1922
31 days
1923
64 days
1924
64 days
1925
94 days
1926
46 days
1927
83 days
1928
72 days
1929
112 days
1930
74 days
1931
92 days
1932
61 days
1933
79 days
1934
88 days
1935
107 days
1936
54 days
1937
45 days
1938
90 days
1939
100 days
1940
91 days
1941
32 days
1942
135 days
1943
113 days
1944
117 days
1945
85 days
1946
58 days
1947
73 days
1948
87 days
1949
119 days
1950
51 days
1951
112 days
1952
41 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
31 years with a frost
Across 31 years with a frost, the median last spring frost at West Branch falls on 23 May and the median first autumn frost on 30 September, which leaves a median of 132 days between them.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
Frost dates and growing season at West Branch
Measure
Median, all years
Earliest period
Recent period (1910 to 1947)
Recent against earliest
Fitted trend
Last spring frost
23 May
n/a
23 May
n/a
-1.3 days per decade
First autumn frost
30 September
n/a
2 October
n/a
+2.2 days per decade
Growing days
132 days
n/a
134 days
n/a
+3.5 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
32 years, 1912 to 1948
A day with at least 122.9 mm (4.8 in) of rain is expected about once in 2 years. A day with at least 236.5 mm (9.3 in) of rain is expected about once in 100 years.
Rainfall return levels at West Branch: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
122.9 mm (4.8 in)
5 years
154.8 mm (6.1 in)
10 years
175.3 mm (6.9 in)
25 years
200.6 mm (7.9 in)
50 years
218.8 mm (8.6 in)
Longer than the 32 years of record
100 years
236.5 mm (9.3 in)
Longer than the 32 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, 32 years of values from 1912 to 1948.
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: 254.0 mm (10.0 in) in 1913; 203.2 mm (8.0 in) in 1937; 170.9 mm (6.7 in) in 1940.
Download the Data
Data for West Branch standing records by year: CSV or JSON. Field meanings are on the data page.
Data for West Branch 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.