Record envelope, standing records and threshold days for Valyermo Rs (USC00049251), California, United States, with 57 years of record.
Key Facts for Valyermo Rs
Valyermo Rs (USC00049251) is a weather station in California, United States at 34.45 latitude and -117.85 longitude, 1,129 m (3,704 ft) above sea level.
The station reports from 1915 to 1971, 57 years of record.
1,464 records set at Valyermo Rs still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Valyermo Rs set a daily record low minimum temperature of -10.6 C (12.9 F) on 8 December 1971.
About the Station
Location: California, United States, 34.45 latitude, -117.85 longitude.
Elevation: 1,129 m (3,704 ft).
Period of record: 1915 to 1971, 57 years.
Eligible elements: tmax, tmin, prcp.
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 Valyermo Rs. 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 Valyermo Rs, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.8 C (82.0 F)
-16.7 C (1.9 F)
n/a
n/a
Feb
25.6 C (78.1 F)
-12.2 C (10.0 F)
n/a
n/a
Mar
29.4 C (84.9 F)
-11.1 C (12.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-6.7 C (19.9 F)
n/a
n/a
May
37.8 C (100.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jun
42.2 C (108.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
42.2 C (108.0 F)
-0.6 C (30.9 F)
n/a
n/a
Aug
42.2 C (108.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
37.8 C (100.0 F)
-7.2 C (19.0 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-13.3 C (8.1 F)
n/a
n/a
Dec
27.2 C (81.0 F)
-12.8 C (9.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Valyermo Rs still stand. 1940 holds the most, with 83.
Standing records at Valyermo Rs by the year they were set
Year set
Standing records
1915
28
1916
28
1933
14
1938
50
1939
57
1940
83
1941
45
1942
50
1943
65
1944
60
1945
71
1946
40
1947
43
1948
36
1949
60
1950
48
1951
27
1952
37
1953
30
1954
32
1955
53
1956
30
1957
28
1958
23
1959
26
1960
39
1961
40
1962
30
1963
31
1964
54
1965
43
1966
27
1967
33
1968
19
1969
26
1970
16
1971
42
Wettest Day of Each Month
Jan: 113.0 mm (4.4 in)
The wettest day on record for each calendar month at Valyermo Rs. The most was 113.0 mm (4.4 in) on 23 January 1943.
Record daily precipitation for each month at Valyermo Rs
Month
Record daily precipitation (mm)
Date
Jan
113.0 mm (4.4 in)
23 January 1943
Feb
101.6 mm (4.0 in)
21 February 1944
Mar
83.3 mm (3.3 in)
2 March 1938
Apr
51.6 mm (2.0 in)
6 April 1926
May
27.9 mm (1.1 in)
28 May 1919
Jun
40.6 mm (1.6 in)
29 June 1925
Jul
36.1 mm (1.4 in)
29 July 1968
Aug
59.7 mm (2.4 in)
10 August 1942
Sep
47.2 mm (1.9 in)
29 September 1932
Oct
43.4 mm (1.7 in)
9 October 1943
Nov
78.0 mm (3.1 in)
22 November 1965
Dec
80.8 mm (3.2 in)
29 December 1965
Period of Record Coverage
1915 to 1971
Complete yearUnder 90 percent of days
37 years of record at Valyermo Rs, 1915 to 1971. 13 years have data for under 90 percent of days and are left out of rankings: 1915, 1916, 1933, 1950, 1954, 1958, 1965, 1966 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Valyermo Rs, 1939 to 1964. Blue stripes are years cooler than the station's own mean of 13.9 C (57.0 F); red stripes are warmer. The coolest year was 1964, at 12.9 C (55.1 F), and the warmest was 1959, at 15.0 C (59.0 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at Valyermo Rs as warming stripes, 1939 to 1964
Year
Annual mean temperature
Difference from the station mean
1939
14.4 C
+0.54 C
1940
14.7 C
+0.81 C
1941
13.1 C
-0.84 C
1942
13.9 C
-0.01 C
1943
14.2 C
+0.28 C
1944
13.0 C
-0.89 C
1945
13.7 C
-0.18 C
1946
13.8 C
-0.06 C
1947
14.0 C
+0.13 C
1949
13.2 C
-0.71 C
1951
14.0 C
+0.11 C
1952
13.8 C
-0.11 C
1953
14.0 C
+0.15 C
1955
13.3 C
-0.58 C
1956
13.9 C
-0.04 C
1957
13.6 C
-0.27 C
1959
15.0 C
+1.10 C
1960
14.7 C
+0.80 C
1961
14.7 C
+0.85 C
1962
13.8 C
-0.14 C
1964
12.9 C
-1.03 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1915 to 1971
Yearly extremes at Valyermo Rs: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
42.2 C (108.0 F)
1940
39.4 C (102.9 F)
37
Coldest night (TNn)
-16.7 C (1.9 F)
1957
-11.1 C (12.0 F)
37
Wettest day (Rx1day)
113.0 mm (4.4 in)
1943
43.2 mm (1.7 in)
56
Wettest five days (Rx5day)
231.1 mm (9.1 in)
1943
64.3 mm (2.5 in)
56
Longest dry spell (CDD)
212 days
1962
92 days
56
Hottest day (TXx)
The hottest day of the year at Valyermo Rs, 1915 to 1971. The record is 42.2 C (108.0 F) in 1940, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Valyermo Rs by year
Year
Hottest day (TXx)
1915
38.9 C (102.0 F)
1916
38.9 C (102.0 F)
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
23.9 C (75.0 F)
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
41.7 C (107.1 F)
1939
41.7 C (107.1 F)
1940
42.2 C (108.0 F)
1941
42.2 C (108.0 F)
1942
41.7 C (107.1 F)
1943
41.7 C (107.1 F)
1944
42.2 C (108.0 F)
1945
41.7 C (107.1 F)
1946
40.6 C (105.1 F)
1947
39.4 C (102.9 F)
1948
39.4 C (102.9 F)
1949
39.4 C (102.9 F)
1950
40.6 C (105.1 F)
1951
38.3 C (100.9 F)
1952
37.8 C (100.0 F)
1953
38.3 C (100.9 F)
1954
40.0 C (104.0 F)
1955
38.9 C (102.0 F)
1956
40.0 C (104.0 F)
1957
38.9 C (102.0 F)
1958
38.9 C (102.0 F)
1959
40.6 C (105.1 F)
1960
41.1 C (106.0 F)
1961
42.2 C (108.0 F)
1962
39.4 C (102.9 F)
1963
37.8 C (100.0 F)
1964
38.9 C (102.0 F)
1965
37.8 C (100.0 F)
1966
38.9 C (102.0 F)
1967
38.9 C (102.0 F)
1968
37.8 C (100.0 F)
1969
39.4 C (102.9 F)
1970
39.4 C (102.9 F)
1971
38.9 C (102.0 F)
Coldest night (TNn)
The coldest night of the year at Valyermo Rs, 1915 to 1971. The record is -16.7 C (1.9 F) in 1957, marked on the chart; the median year is -11.1 C (12.0 F).
Coldest night (TNn) at Valyermo Rs by year
Year
Coldest night (TNn)
1915
-9.4 C (15.1 F)
1916
-8.9 C (16.0 F)
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
n/a
1923
n/a
1924
n/a
1925
n/a
1926
n/a
1927
n/a
1928
n/a
1929
n/a
1930
n/a
1931
n/a
1932
n/a
1933
-3.3 C (26.1 F)
1934
n/a
1935
n/a
1936
n/a
1937
n/a
1938
-10.6 C (12.9 F)
1939
-10.6 C (12.9 F)
1940
-11.1 C (12.0 F)
1941
-8.3 C (17.1 F)
1942
-11.1 C (12.0 F)
1943
-13.3 C (8.1 F)
1944
-11.1 C (12.0 F)
1945
-11.1 C (12.0 F)
1946
-10.0 C (14.0 F)
1947
-8.9 C (16.0 F)
1948
-11.1 C (12.0 F)
1949
-12.8 C (9.0 F)
1950
-12.8 C (9.0 F)
1951
-9.4 C (15.1 F)
1952
-10.0 C (14.0 F)
1953
-9.4 C (15.1 F)
1954
-9.4 C (15.1 F)
1955
-11.7 C (10.9 F)
1956
-9.4 C (15.1 F)
1957
-16.7 C (1.9 F)
1958
-6.7 C (19.9 F)
1959
-11.1 C (12.0 F)
1960
-11.7 C (10.9 F)
1961
-8.3 C (17.1 F)
1962
-10.6 C (12.9 F)
1963
-11.1 C (12.0 F)
1964
-13.3 C (8.1 F)
1965
-12.8 C (9.0 F)
1966
-12.2 C (10.0 F)
1967
-12.2 C (10.0 F)
1968
-9.4 C (15.1 F)
1969
-12.2 C (10.0 F)
1970
-11.1 C (12.0 F)
1971
-10.6 C (12.9 F)
Wettest day (Rx1day)
The wettest day of the year at Valyermo Rs, 1915 to 1971. The record is 113.0 mm (4.4 in) in 1943, marked on the chart; the median year is 43.2 mm (1.7 in).
Wettest day (Rx1day) at Valyermo Rs by year
Year
Wettest day (Rx1day)
1915
48.3 mm (1.9 in)
1916
70.4 mm (2.8 in)
1918
32.8 mm (1.3 in)
1919
29.5 mm (1.2 in)
1920
25.4 mm (1.0 in)
1921
79.5 mm (3.1 in)
1922
41.4 mm (1.6 in)
1923
16.5 mm (0.6 in)
1924
31.8 mm (1.3 in)
1925
40.6 mm (1.6 in)
1926
51.6 mm (2.0 in)
1927
35.6 mm (1.4 in)
1928
71.9 mm (2.8 in)
1929
22.1 mm (0.9 in)
1930
44.7 mm (1.8 in)
1931
46.5 mm (1.8 in)
1932
49.5 mm (1.9 in)
1933
65.3 mm (2.6 in)
1934
39.6 mm (1.6 in)
1935
31.5 mm (1.2 in)
1936
28.4 mm (1.1 in)
1937
26.4 mm (1.0 in)
1938
83.3 mm (3.3 in)
1939
45.5 mm (1.8 in)
1940
35.8 mm (1.4 in)
1941
37.3 mm (1.5 in)
1942
59.7 mm (2.4 in)
1943
113.0 mm (4.4 in)
1944
101.6 mm (4.0 in)
1945
48.0 mm (1.9 in)
1946
69.9 mm (2.8 in)
1947
44.2 mm (1.7 in)
1948
29.2 mm (1.1 in)
1949
43.2 mm (1.7 in)
1950
20.3 mm (0.8 in)
1951
34.0 mm (1.3 in)
1952
57.2 mm (2.3 in)
1953
23.1 mm (0.9 in)
1954
56.6 mm (2.2 in)
1955
28.7 mm (1.1 in)
1956
84.3 mm (3.3 in)
1957
68.6 mm (2.7 in)
1958
59.7 mm (2.4 in)
1959
49.0 mm (1.9 in)
1960
27.2 mm (1.1 in)
1961
40.9 mm (1.6 in)
1962
64.0 mm (2.5 in)
1963
40.9 mm (1.6 in)
1964
43.2 mm (1.7 in)
1965
80.8 mm (3.2 in)
1966
23.9 mm (0.9 in)
1967
59.7 mm (2.4 in)
1968
36.1 mm (1.4 in)
1969
38.4 mm (1.5 in)
1970
72.9 mm (2.9 in)
1971
12.2 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Valyermo Rs, 1915 to 1971. The record is 231.1 mm (9.1 in) in 1943, marked on the chart; the median year is 64.3 mm (2.5 in).
Wettest five days (Rx5day) at Valyermo Rs by year
Year
Wettest five days (Rx5day)
1915
48.3 mm (1.9 in)
1916
134.9 mm (5.3 in)
1918
35.9 mm (1.4 in)
1919
40.9 mm (1.6 in)
1920
35.5 mm (1.4 in)
1921
186.5 mm (7.3 in)
1922
65.1 mm (2.6 in)
1923
19.8 mm (0.8 in)
1924
35.4 mm (1.4 in)
1925
45.2 mm (1.8 in)
1926
93.3 mm (3.7 in)
1927
105.5 mm (4.2 in)
1928
71.9 mm (2.8 in)
1929
25.7 mm (1.0 in)
1930
56.3 mm (2.2 in)
1931
74.1 mm (2.9 in)
1932
98.5 mm (3.9 in)
1933
123.0 mm (4.8 in)
1934
78.5 mm (3.1 in)
1935
40.4 mm (1.6 in)
1936
74.1 mm (2.9 in)
1937
63.5 mm (2.5 in)
1938
171.4 mm (6.7 in)
1939
87.4 mm (3.4 in)
1940
60.9 mm (2.4 in)
1941
75.6 mm (3.0 in)
1942
59.7 mm (2.4 in)
1943
231.1 mm (9.1 in)
1944
177.0 mm (7.0 in)
1945
63.5 mm (2.5 in)
1946
130.3 mm (5.1 in)
1947
68.3 mm (2.7 in)
1948
39.9 mm (1.6 in)
1949
66.4 mm (2.6 in)
1950
27.2 mm (1.1 in)
1951
37.1 mm (1.5 in)
1952
69.3 mm (2.7 in)
1953
31.7 mm (1.2 in)
1954
56.6 mm (2.2 in)
1955
78.5 mm (3.1 in)
1956
90.9 mm (3.6 in)
1957
80.5 mm (3.2 in)
1958
60.9 mm (2.4 in)
1959
49.0 mm (1.9 in)
1960
34.3 mm (1.4 in)
1961
42.9 mm (1.7 in)
1962
140.7 mm (5.5 in)
1963
42.5 mm (1.7 in)
1964
55.4 mm (2.2 in)
1965
94.5 mm (3.7 in)
1966
80.8 mm (3.2 in)
1967
110.7 mm (4.4 in)
1968
38.4 mm (1.5 in)
1969
46.5 mm (1.8 in)
1970
120.1 mm (4.7 in)
1971
12.2 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Valyermo Rs, 1915 to 1971. The record is 212 days in 1962, marked on the chart; the median year is 92 days.
Longest dry spell (CDD) at Valyermo Rs by year
Year
Longest dry spell (CDD)
1915
185 days
1916
77 days
1918
76 days
1919
69 days
1920
206 days
1921
70 days
1922
66 days
1923
103 days
1924
167 days
1925
63 days
1926
111 days
1927
190 days
1928
156 days
1929
118 days
1930
193 days
1931
77 days
1932
116 days
1933
99 days
1934
92 days
1935
87 days
1936
87 days
1937
58 days
1938
86 days
1939
109 days
1940
31 days
1941
164 days
1942
84 days
1943
163 days
1944
169 days
1945
67 days
1946
70 days
1947
104 days
1948
91 days
1949
176 days
1950
62 days
1951
67 days
1952
89 days
1953
66 days
1954
88 days
1955
95 days
1956
88 days
1957
72 days
1958
46 days
1959
159 days
1960
136 days
1961
127 days
1962
212 days
1963
130 days
1964
176 days
1965
58 days
1966
127 days
1967
77 days
1968
73 days
1969
101 days
1970
92 days
1971
52 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Valyermo Rs falls on 16 May and the median first autumn frost on 19 October, which leaves a median of 150 days between them.
Frost dates and growing season at Valyermo Rs
Measure
Median, all years
Earliest period
Recent period (1939 to 1964)
Recent against earliest
Fitted trend
Last spring frost
16 May
n/a
16 May
n/a
n/a
First autumn frost
19 October
n/a
19 October
n/a
n/a
Growing days
150 days
n/a
150 days
n/a
n/a
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
46 years, 1919 to 1971
A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 121.7 mm (4.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Valyermo Rs: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
44.7 mm (1.8 in)
5 years
65.4 mm (2.6 in)
10 years
79.1 mm (3.1 in)
25 years
96.3 mm (3.8 in)
50 years
109.1 mm (4.3 in)
Longer than the 46 years of record
100 years
121.7 mm (4.8 in)
Longer than the 46 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, 46 years of values from 1919 to 1971.
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: 113.0 mm (4.4 in) in 1943; 101.6 mm (4.0 in) in 1944; 84.3 mm (3.3 in) in 1956.
Download the Data
Data for Valyermo Rs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Valyermo Rs 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.