Record envelope, standing records and threshold days for Forest Glen (USC00043130), California, United States, with 56 years of record.
Key Facts for Forest Glen
Forest Glen (USC00043130) is a weather station in California, United States at 40.38 latitude and -123.33 longitude, 713 m (2,339 ft) above sea level.
The station reports from 1930 to 1985, 56 years of record.
1,464 records set at Forest Glen still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Forest Glen set a daily record high minimum temperature of 13.3 C (55.9 F) on 21 June 1985.
About the Station
Location: California, United States, 40.38 latitude, -123.33 longitude.
Elevation: 713 m (2,339 ft).
Period of record: 1930 to 1985, 56 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
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 Forest Glen. 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 Forest Glen, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-15.6 C (3.9 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-11.1 C (12.0 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-8.3 C (17.1 F)
n/a
n/a
May
37.8 C (100.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
42.2 C (108.0 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
37.2 C (99.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
24.4 C (75.9 F)
-10.6 C (12.9 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-18.9 C (-2.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Forest Glen still stand. 1932 holds the most, with 50.
Standing records at Forest Glen by the year they were set
Year set
Standing records
1930
41
1931
42
1932
50
1933
42
1934
34
1935
27
1936
30
1937
38
1938
29
1939
50
1940
25
1941
29
1942
21
1943
35
1944
34
1945
36
1946
27
1947
10
1948
45
1949
34
1950
6
1951
8
1952
46
1953
29
1954
21
1955
11
1956
12
1957
21
1958
23
1959
24
1960
25
1961
32
1962
22
1963
23
1964
38
1965
24
1966
33
1967
23
1968
28
1969
20
1970
19
1971
22
1972
23
1973
17
1974
26
1975
23
1976
12
1977
27
1978
28
1979
19
1980
8
1981
2
1982
16
1983
20
1984
29
1985
25
Wettest Day of Each Month
Jan: 187.5 mm (7.4 in)
The wettest day on record for each calendar month at Forest Glen. The most was 187.5 mm (7.4 in) on 16 January 1954.
Record daily precipitation for each month at Forest Glen
Month
Record daily precipitation (mm)
Date
Jan
187.5 mm (7.4 in)
16 January 1954
Feb
144.3 mm (5.7 in)
28 February 1940
Mar
142.0 mm (5.6 in)
30 March 1974
Apr
111.5 mm (4.4 in)
12 April 1982
May
76.2 mm (3.0 in)
18 May 1957
Jun
33.8 mm (1.3 in)
19 June 1969
Jul
53.8 mm (2.1 in)
18 July 1938
Aug
30.0 mm (1.2 in)
7 August 1962
Sep
65.5 mm (2.6 in)
27 September 1957
Oct
116.8 mm (4.6 in)
12 October 1962
Nov
155.2 mm (6.1 in)
16 November 1981
Dec
185.4 mm (7.3 in)
22 December 1964
Period of Record Coverage
1930 to 1985
Complete yearUnder 90 percent of days
56 years of record at Forest Glen, 1930 to 1985. 20 years have data for under 90 percent of days and are left out of rankings: 1945, 1947, 1948, 1949, 1950, 1951, 1952, 1953 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 27 complete years at Forest Glen, 1930 to 1984. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 1933, at 9.5 C (49.2 F), and the warmest was 1958, at 12.0 C (53.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Forest Glen as warming stripes, 1930 to 1984
Year
Annual mean temperature
Difference from the station mean
1930
10.5 C
-0.29 C
1931
10.7 C
-0.09 C
1932
9.9 C
-0.90 C
1933
9.5 C
-1.27 C
1934
11.9 C
+1.07 C
1935
10.0 C
-0.83 C
1937
10.7 C
-0.09 C
1938
10.9 C
+0.08 C
1939
10.8 C
-0.02 C
1941
11.1 C
+0.30 C
1943
11.5 C
+0.65 C
1944
10.9 C
+0.07 C
1946
10.1 C
-0.69 C
1957
10.5 C
-0.32 C
1958
12.0 C
+1.16 C
1959
11.0 C
+0.19 C
1960
11.3 C
+0.50 C
1961
11.0 C
+0.23 C
1963
10.9 C
+0.11 C
1966
11.0 C
+0.21 C
1967
10.4 C
-0.39 C
1969
10.8 C
-0.06 C
1974
11.1 C
+0.29 C
1975
10.3 C
-0.48 C
1982
10.5 C
-0.33 C
1983
11.1 C
+0.33 C
1984
11.3 C
+0.50 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
1930 to 1985
Yearly extremes at Forest Glen: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1959
39.4 C (102.9 F)
56
Coldest night (TNn)
-18.9 C (-2.0 F)
1932
-11.1 C (12.0 F)
56
Wettest day (Rx1day)
187.5 mm (7.4 in)
1954
89.8 mm (3.5 in)
56
Wettest five days (Rx5day)
556.0 mm (21.9 in)
1964
244.3 mm (9.6 in)
56
Longest dry spell (CDD)
131 days
1960
62 days
56
Hottest day (TXx)
The hottest day of the year at Forest Glen, 1930 to 1985. The record is 43.3 C (109.9 F) in 1959, marked on the chart; the median year is 39.4 C (102.9 F).
Hottest day (TXx) at Forest Glen by year
Year
Hottest day (TXx)
1930
36.1 C (97.0 F)
1931
38.9 C (102.0 F)
1932
40.0 C (104.0 F)
1933
40.6 C (105.1 F)
1934
38.3 C (100.9 F)
1935
40.6 C (105.1 F)
1936
38.3 C (100.9 F)
1937
38.9 C (102.0 F)
1938
39.4 C (102.9 F)
1939
40.6 C (105.1 F)
1940
40.0 C (104.0 F)
1941
37.8 C (100.0 F)
1942
40.0 C (104.0 F)
1943
38.9 C (102.0 F)
1944
37.8 C (100.0 F)
1945
38.9 C (102.0 F)
1946
40.6 C (105.1 F)
1947
32.2 C (90.0 F)
1948
36.7 C (98.1 F)
1949
32.2 C (90.0 F)
1950
38.9 C (102.0 F)
1951
31.7 C (89.1 F)
1952
40.6 C (105.1 F)
1953
39.4 C (102.9 F)
1954
38.9 C (102.0 F)
1955
42.2 C (108.0 F)
1956
41.1 C (106.0 F)
1957
39.4 C (102.9 F)
1958
39.4 C (102.9 F)
1959
43.3 C (109.9 F)
1960
40.0 C (104.0 F)
1961
41.1 C (106.0 F)
1962
39.4 C (102.9 F)
1963
37.8 C (100.0 F)
1964
40.0 C (104.0 F)
1965
37.2 C (99.0 F)
1966
40.0 C (104.0 F)
1967
39.4 C (102.9 F)
1968
41.1 C (106.0 F)
1969
40.0 C (104.0 F)
1970
40.0 C (104.0 F)
1971
40.0 C (104.0 F)
1972
42.8 C (109.0 F)
1973
40.6 C (105.1 F)
1974
39.4 C (102.9 F)
1975
40.0 C (104.0 F)
1976
35.0 C (95.0 F)
1977
39.4 C (102.9 F)
1978
42.8 C (109.0 F)
1979
40.6 C (105.1 F)
1980
37.2 C (99.0 F)
1981
17.2 C (63.0 F)
1982
39.4 C (102.9 F)
1983
37.8 C (100.0 F)
1984
40.6 C (105.1 F)
1985
40.0 C (104.0 F)
Coldest night (TNn)
The coldest night of the year at Forest Glen, 1930 to 1985. The record is -18.9 C (-2.0 F) in 1932, marked on the chart; the median year is -11.1 C (12.0 F).
Coldest night (TNn) at Forest Glen by year
Year
Coldest night (TNn)
1930
-13.9 C (7.0 F)
1931
-13.9 C (7.0 F)
1932
-18.9 C (-2.0 F)
1933
-12.2 C (10.0 F)
1934
-6.1 C (21.0 F)
1935
-11.7 C (10.9 F)
1936
-11.1 C (12.0 F)
1937
-17.8 C (0.0 F)
1938
-9.4 C (15.1 F)
1939
-10.6 C (12.9 F)
1940
-12.8 C (9.0 F)
1941
-7.8 C (18.0 F)
1942
-13.3 C (8.1 F)
1943
-12.8 C (9.0 F)
1944
-7.8 C (18.0 F)
1945
-10.6 C (12.9 F)
1946
-8.9 C (16.0 F)
1947
-12.2 C (10.0 F)
1948
-13.9 C (7.0 F)
1949
-18.9 C (-2.0 F)
1950
6.1 C (43.0 F)
1951
-10.0 C (14.0 F)
1952
-10.0 C (14.0 F)
1953
-11.1 C (12.0 F)
1954
-7.8 C (18.0 F)
1955
-5.6 C (21.9 F)
1956
-12.2 C (10.0 F)
1957
-15.0 C (5.0 F)
1958
-9.4 C (15.1 F)
1959
-10.0 C (14.0 F)
1960
-11.1 C (12.0 F)
1961
-10.6 C (12.9 F)
1962
-15.0 C (5.0 F)
1963
-10.6 C (12.9 F)
1964
-8.3 C (17.1 F)
1965
-11.7 C (10.9 F)
1966
-11.1 C (12.0 F)
1967
-12.8 C (9.0 F)
1968
-11.7 C (10.9 F)
1969
-11.7 C (10.9 F)
1970
-8.9 C (16.0 F)
1971
-8.9 C (16.0 F)
1972
-12.2 C (10.0 F)
1973
-10.6 C (12.9 F)
1974
-10.0 C (14.0 F)
1975
-10.6 C (12.9 F)
1976
-8.9 C (16.0 F)
1977
-11.7 C (10.9 F)
1978
-11.7 C (10.9 F)
1979
-12.2 C (10.0 F)
1980
-11.1 C (12.0 F)
1981
-2.2 C (28.0 F)
1982
-12.2 C (10.0 F)
1983
-7.8 C (18.0 F)
1984
-7.8 C (18.0 F)
1985
-6.1 C (21.0 F)
Wettest day (Rx1day)
The wettest day of the year at Forest Glen, 1930 to 1985. The record is 187.5 mm (7.4 in) in 1954, marked on the chart; the median year is 89.8 mm (3.5 in).
Wettest day (Rx1day) at Forest Glen by year
Year
Wettest day (Rx1day)
1930
69.1 mm (2.7 in)
1931
84.8 mm (3.3 in)
1932
81.3 mm (3.2 in)
1933
102.9 mm (4.1 in)
1934
59.9 mm (2.4 in)
1935
76.5 mm (3.0 in)
1936
87.1 mm (3.4 in)
1937
125.5 mm (4.9 in)
1938
84.8 mm (3.3 in)
1939
93.5 mm (3.7 in)
1940
144.3 mm (5.7 in)
1941
174.5 mm (6.9 in)
1942
74.4 mm (2.9 in)
1943
147.8 mm (5.8 in)
1944
66.8 mm (2.6 in)
1945
100.3 mm (3.9 in)
1946
73.7 mm (2.9 in)
1947
66.3 mm (2.6 in)
1948
76.2 mm (3.0 in)
1949
78.7 mm (3.1 in)
1950
0.0 mm (0.00 in)
1951
59.7 mm (2.4 in)
1952
81.3 mm (3.2 in)
1953
78.7 mm (3.1 in)
1954
187.5 mm (7.4 in)
1955
17.8 mm (0.7 in)
1956
15.5 mm (0.6 in)
1957
92.5 mm (3.6 in)
1958
97.0 mm (3.8 in)
1959
88.9 mm (3.5 in)
1960
104.9 mm (4.1 in)
1961
88.1 mm (3.5 in)
1962
116.8 mm (4.6 in)
1963
127.0 mm (5.0 in)
1964
185.4 mm (7.3 in)
1965
70.6 mm (2.8 in)
1966
84.6 mm (3.3 in)
1967
141.7 mm (5.6 in)
1968
101.6 mm (4.0 in)
1969
162.6 mm (6.4 in)
1970
106.2 mm (4.2 in)
1971
139.7 mm (5.5 in)
1972
83.8 mm (3.3 in)
1973
119.4 mm (4.7 in)
1974
153.2 mm (6.0 in)
1975
127.0 mm (5.0 in)
1976
109.7 mm (4.3 in)
1977
58.4 mm (2.3 in)
1978
68.3 mm (2.7 in)
1979
106.9 mm (4.2 in)
1980
87.1 mm (3.4 in)
1981
155.2 mm (6.1 in)
1982
111.5 mm (4.4 in)
1983
112.5 mm (4.4 in)
1984
87.9 mm (3.5 in)
1985
90.7 mm (3.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Forest Glen, 1930 to 1985. The record is 556.0 mm (21.9 in) in 1964, marked on the chart; the median year is 244.3 mm (9.6 in).
Wettest five days (Rx5day) at Forest Glen by year
Year
Wettest five days (Rx5day)
1930
184.7 mm (7.3 in)
1931
239.7 mm (9.4 in)
1932
186.7 mm (7.4 in)
1933
230.3 mm (9.1 in)
1934
159.5 mm (6.3 in)
1935
146.3 mm (5.8 in)
1936
165.9 mm (6.5 in)
1937
234.2 mm (9.2 in)
1938
267.7 mm (10.5 in)
1939
246.8 mm (9.7 in)
1940
360.9 mm (14.2 in)
1941
318.8 mm (12.6 in)
1942
241.7 mm (9.5 in)
1943
295.3 mm (11.6 in)
1944
167.5 mm (6.6 in)
1945
271.0 mm (10.7 in)
1946
252.8 mm (10.0 in)
1947
172.0 mm (6.8 in)
1948
267.2 mm (10.5 in)
1949
222.2 mm (8.7 in)
1950
0.0 mm (0.00 in)
1951
202.7 mm (8.0 in)
1952
248.9 mm (9.8 in)
1953
219.7 mm (8.6 in)
1954
321.6 mm (12.7 in)
1955
24.7 mm (1.0 in)
1956
22.4 mm (0.9 in)
1957
234.2 mm (9.2 in)
1958
216.1 mm (8.5 in)
1959
309.1 mm (12.2 in)
1960
283.7 mm (11.2 in)
1961
187.9 mm (7.4 in)
1962
381.7 mm (15.0 in)
1963
307.5 mm (12.1 in)
1964
556.0 mm (21.9 in)
1965
195.8 mm (7.7 in)
1966
263.2 mm (10.4 in)
1967
255.0 mm (10.0 in)
1968
217.5 mm (8.6 in)
1969
311.7 mm (12.3 in)
1970
314.4 mm (12.4 in)
1971
261.4 mm (10.3 in)
1972
167.2 mm (6.6 in)
1973
318.0 mm (12.5 in)
1974
396.0 mm (15.6 in)
1975
280.5 mm (11.0 in)
1976
240.2 mm (9.5 in)
1977
121.7 mm (4.8 in)
1978
270.9 mm (10.7 in)
1979
168.2 mm (6.6 in)
1980
249.8 mm (9.8 in)
1981
260.0 mm (10.2 in)
1982
270.3 mm (10.6 in)
1983
272.2 mm (10.7 in)
1984
215.0 mm (8.5 in)
1985
110.5 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Forest Glen, 1930 to 1985. The record is 131 days in 1960, marked on the chart; the median year is 62 days.
Longest dry spell (CDD) at Forest Glen by year
Year
Longest dry spell (CDD)
1930
75 days
1931
93 days
1932
79 days
1933
56 days
1934
89 days
1935
65 days
1936
56 days
1937
105 days
1938
67 days
1939
69 days
1940
82 days
1941
47 days
1942
35 days
1943
52 days
1944
65 days
1945
53 days
1946
52 days
1947
21 days
1948
72 days
1949
27 days
1950
31 days
1951
44 days
1952
112 days
1953
75 days
1954
71 days
1955
47 days
1956
33 days
1957
73 days
1958
33 days
1959
87 days
1960
131 days
1961
62 days
1962
60 days
1963
86 days
1964
89 days
1965
47 days
1966
49 days
1967
106 days
1968
36 days
1969
90 days
1970
82 days
1971
60 days
1972
50 days
1973
94 days
1974
61 days
1975
60 days
1976
36 days
1977
73 days
1978
62 days
1979
49 days
1980
23 days
1981
6 days
1982
66 days
1983
37 days
1984
84 days
1985
45 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
27 years with a frost
Across 27 years with a frost, the median last spring frost at Forest Glen falls on 30 May and the median first autumn frost on 30 September, which leaves a median of 120 days between them.
Fitted over all years, the growing season changes by +5.4 days per decade at this station.
Frost dates and growing season at Forest Glen
Measure
Median, all years
Earliest period
Recent period (1930 to 1984)
Recent against earliest
Fitted trend
Last spring frost
30 May
n/a
30 May
n/a
-1.9 days per decade
First autumn frost
30 September
n/a
30 September
n/a
+3.4 days per decade
Growing days
120 days
n/a
120 days
n/a
+5.4 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
37 years, 1930 to 1984
A day with at least 97.4 mm (3.8 in) of rain is expected about once in 2 years. A day with at least 202.3 mm (8.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Forest Glen: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
97.4 mm (3.8 in)
5 years
125.8 mm (5.0 in)
10 years
144.4 mm (5.7 in)
25 years
167.9 mm (6.6 in)
50 years
185.2 mm (7.3 in)
Longer than the 37 years of record
100 years
202.3 mm (8.0 in)
Longer than the 37 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, 37 years of values from 1930 to 1984.
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: 174.5 mm (6.9 in) in 1941; 162.6 mm (6.4 in) in 1969; 153.2 mm (6.0 in) in 1974.
Download the Data
Data for Forest Glen standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Forest Glen 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.