Record envelope, standing records and threshold days for Lake Arrowhead (USC00044671), California, United States, with 69 years of record.
Key Facts for Lake Arrowhead
Lake Arrowhead (USC00044671) is a weather station in California, United States at 34.25 latitude and -117.19 longitude, 1,587 m (5,205 ft) above sea level.
The station reports from 1941 to 2009, 69 years of record.
1,464 records set at Lake Arrowhead still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Lake Arrowhead set a daily record high minimum temperature of 13.3 C (55.9 F) on 19 May 2009.
About the Station
Location: California, United States, 34.25 latitude, -117.19 longitude.
Elevation: 1,587 m (5,205 ft).
Period of record: 1941 to 2009, 69 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 Lake Arrowhead. 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 Lake Arrowhead, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.7 C (71.1 F)
-14.4 C (6.1 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-15.0 C (5.0 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-11.7 C (10.9 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-9.4 C (15.1 F)
n/a
n/a
May
33.9 C (93.0 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
40.0 C (104.0 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
4.4 C (39.9 F)
n/a
n/a
Aug
37.2 C (99.0 F)
0.6 C (33.1 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-10.6 C (12.9 F)
n/a
n/a
Dec
22.2 C (72.0 F)
-14.4 C (6.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Lake Arrowhead still stand. 1949 holds the most, with 69.
Standing records at Lake Arrowhead by the year they were set
Year set
Standing records
1941
15
1942
26
1943
28
1944
28
1945
29
1946
18
1947
31
1948
28
1949
69
1950
50
1951
29
1952
20
1953
30
1954
17
1955
26
1956
14
1957
21
1958
20
1959
24
1960
17
1961
19
1962
28
1963
32
1964
36
1965
31
1966
15
1967
25
1968
14
1969
16
1970
17
1971
37
1972
30
1973
11
1974
10
1975
23
1976
20
1977
18
1978
14
1979
22
1980
8
1981
22
1982
28
1983
12
1984
9
1985
26
1986
25
1987
19
1988
18
1989
36
1990
19
1991
18
1992
5
1993
11
1994
16
1995
17
1996
32
1997
13
1998
26
1999
26
2000
25
2001
17
2002
12
2003
8
2004
9
2005
7
2006
21
2007
11
2008
6
2009
4
All-Time Record Progression
3 new records
3 all-time records were set at Lake Arrowhead between 27 March 1991 and 15 June 2000. Each dot is a new record.
When Lake Arrowhead set new all-time records
Date
Kind
Detail
1991-03-27
Record daily snowfall
Record daily snowfall 91.4 cm (36.0 in)
2000-06-14
Record high maximum temperature
Record high maximum temperature 38.9 C (102.0 F)
2000-06-15
Record high maximum temperature
Record high maximum temperature 40.0 C (104.0 F)
Wettest Day of Each Month
Jan: 361.7 mm (14.2 in)
The wettest day on record for each calendar month at Lake Arrowhead. The most was 361.7 mm (14.2 in) on 25 January 1969.
Record daily precipitation for each month at Lake Arrowhead
Month
Record daily precipitation (mm)
Date
Jan
361.7 mm (14.2 in)
25 January 1969
Feb
247.7 mm (9.8 in)
25 February 1969
Mar
187.5 mm (7.4 in)
17 March 1982
Apr
152.4 mm (6.0 in)
5 April 2006
May
130.0 mm (5.1 in)
5 May 1998
Jun
90.9 mm (3.6 in)
5 June 1993
Jul
48.8 mm (1.9 in)
28 July 1968
Aug
56.6 mm (2.2 in)
17 August 1977
Sep
141.7 mm (5.6 in)
11 September 1976
Oct
238.8 mm (9.4 in)
20 October 2004
Nov
180.1 mm (7.1 in)
23 November 1965
Dec
283.0 mm (11.1 in)
6 December 1966
Period of Record Coverage
1941 to 2009
Complete yearUnder 90 percent of days
69 years of record at Lake Arrowhead, 1941 to 2009. 14 years have data for under 90 percent of days and are left out of rankings: 1941, 1980, 1985, 1994, 1997, 1998, 2001, 2002 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 51 complete years at Lake Arrowhead, 1942 to 2006. Blue stripes are years cooler than the station's own mean of 11.0 C (51.8 F); red stripes are warmer. The coolest year was 1982, at 9.6 C (49.3 F), and the warmest was 2000, at 12.5 C (54.5 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Lake Arrowhead as warming stripes, 1942 to 2006
Year
Annual mean temperature
Difference from the station mean
1942
11.7 C
+0.76 C
1943
12.0 C
+1.02 C
1944
10.3 C
-0.67 C
1945
11.3 C
+0.37 C
1946
10.7 C
-0.29 C
1947
11.2 C
+0.20 C
1949
10.5 C
-0.51 C
1950
12.3 C
+1.31 C
1952
10.2 C
-0.77 C
1953
11.0 C
+0.01 C
1954
11.5 C
+0.52 C
1955
10.4 C
-0.59 C
1956
11.0 C
+0.05 C
1957
10.4 C
-0.62 C
1958
11.4 C
+0.41 C
1959
11.6 C
+0.61 C
1960
11.4 C
+0.46 C
1961
11.1 C
+0.09 C
1963
10.7 C
-0.27 C
1964
10.3 C
-0.63 C
1965
10.3 C
-0.63 C
1966
11.2 C
+0.25 C
1967
10.6 C
-0.33 C
1968
10.9 C
-0.09 C
1969
11.0 C
+0.01 C
1970
11.4 C
+0.45 C
1971
10.2 C
-0.79 C
1972
10.5 C
-0.49 C
1973
10.5 C
-0.48 C
1974
10.9 C
-0.06 C
1975
10.0 C
-0.97 C
1976
10.4 C
-0.53 C
1977
11.1 C
+0.12 C
1978
10.7 C
-0.28 C
1979
10.7 C
-0.25 C
1981
11.6 C
+0.64 C
1982
9.6 C
-1.37 C
1983
10.2 C
-0.79 C
1986
11.2 C
+0.25 C
1987
10.6 C
-0.33 C
1988
11.3 C
+0.30 C
1989
11.6 C
+0.58 C
1990
10.8 C
-0.19 C
1991
10.9 C
-0.07 C
1992
11.1 C
+0.17 C
1993
10.9 C
-0.11 C
1995
11.7 C
+0.74 C
1996
12.4 C
+1.39 C
1999
11.4 C
+0.42 C
2000
12.5 C
+1.55 C
2006
10.6 C
-0.36 C
The fitted trend in annual mean temperature here over 1942 to 2006 is 0.02 C (-0.08 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.04 F (-0.14 to 0.23) per decade. The slope is a straight line fitted to 51 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Lake Arrowhead
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.02 C (-0.08 to 0.13) per decade
0.04 F (-0.14 to 0.23) per decade
1942 to 2006
51
Not clearly different from zero
Mean daily maximum
-0.09 C (-0.23 to 0.05) per decade
-0.2 F (-0.4 to 0.1) per decade
1942 to 2006
51
Not clearly different from zero
Mean daily minimum
0.1 C (0.1 to 0.2) per decade
0.3 F (0.1 to 0.4) per decade
1942 to 2006
51
Rise
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
1941 to 2009
Yearly extremes at Lake Arrowhead: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
2000
33.9 C (93.0 F)
69
Coldest night (TNn)
-15.0 C (5.0 F)
1949
-10.0 C (14.0 F)
69
Wettest day (Rx1day)
361.7 mm (14.2 in)
1969
130.0 mm (5.1 in)
69
Wettest five days (Rx5day)
806.5 mm (31.8 in)
2005
228.6 mm (9.0 in)
69
Longest dry spell (CDD)
195 days
2002
82 days
69
Hottest day (TXx)
The hottest day of the year at Lake Arrowhead, 1941 to 2009. The record is 40.0 C (104.0 F) in 2000, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Lake Arrowhead by year
Year
Hottest day (TXx)
1941
31.1 C (88.0 F)
1942
35.6 C (96.1 F)
1943
35.6 C (96.1 F)
1944
37.2 C (99.0 F)
1945
34.4 C (93.9 F)
1946
33.9 C (93.0 F)
1947
38.3 C (100.9 F)
1948
35.0 C (95.0 F)
1949
34.4 C (93.9 F)
1950
36.7 C (98.1 F)
1951
32.2 C (90.0 F)
1952
30.6 C (87.1 F)
1953
32.2 C (90.0 F)
1954
35.0 C (95.0 F)
1955
34.4 C (93.9 F)
1956
33.3 C (91.9 F)
1957
31.7 C (89.1 F)
1958
32.2 C (90.0 F)
1959
32.2 C (90.0 F)
1960
35.6 C (96.1 F)
1961
35.0 C (95.0 F)
1962
33.9 C (93.0 F)
1963
31.1 C (88.0 F)
1964
32.2 C (90.0 F)
1965
31.1 C (88.0 F)
1966
31.7 C (89.1 F)
1967
35.0 C (95.0 F)
1968
32.8 C (91.0 F)
1969
33.9 C (93.0 F)
1970
36.7 C (98.1 F)
1971
35.6 C (96.1 F)
1972
37.8 C (100.0 F)
1973
33.3 C (91.9 F)
1974
32.8 C (91.0 F)
1975
34.4 C (93.9 F)
1976
33.3 C (91.9 F)
1977
32.8 C (91.0 F)
1978
33.9 C (93.0 F)
1979
35.0 C (95.0 F)
1980
34.4 C (93.9 F)
1981
33.3 C (91.9 F)
1982
33.3 C (91.9 F)
1983
33.9 C (93.0 F)
1984
33.3 C (91.9 F)
1985
38.3 C (100.9 F)
1986
31.7 C (89.1 F)
1987
31.1 C (88.0 F)
1988
32.2 C (90.0 F)
1989
35.6 C (96.1 F)
1990
32.2 C (90.0 F)
1991
33.9 C (93.0 F)
1992
33.3 C (91.9 F)
1993
33.3 C (91.9 F)
1994
35.6 C (96.1 F)
1995
35.6 C (96.1 F)
1996
34.4 C (93.9 F)
1997
35.0 C (95.0 F)
1998
35.6 C (96.1 F)
1999
33.9 C (93.0 F)
2000
40.0 C (104.0 F)
2001
35.6 C (96.1 F)
2002
35.0 C (95.0 F)
2003
33.9 C (93.0 F)
2004
32.2 C (90.0 F)
2005
35.0 C (95.0 F)
2006
32.8 C (91.0 F)
2007
32.2 C (90.0 F)
2008
32.8 C (91.0 F)
2009
29.4 C (84.9 F)
Coldest night (TNn)
The coldest night of the year at Lake Arrowhead, 1941 to 2009. The record is -15.0 C (5.0 F) in 1949, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Lake Arrowhead by year
Year
Coldest night (TNn)
1941
-7.8 C (18.0 F)
1942
-9.4 C (15.1 F)
1943
-10.0 C (14.0 F)
1944
-10.0 C (14.0 F)
1945
-10.0 C (14.0 F)
1946
-10.6 C (12.9 F)
1947
-7.8 C (18.0 F)
1948
-12.2 C (10.0 F)
1949
-15.0 C (5.0 F)
1950
-12.2 C (10.0 F)
1951
-11.7 C (10.9 F)
1952
-11.7 C (10.9 F)
1953
-10.0 C (14.0 F)
1954
-7.8 C (18.0 F)
1955
-10.0 C (14.0 F)
1956
-7.8 C (18.0 F)
1957
-9.4 C (15.1 F)
1958
-9.4 C (15.1 F)
1959
-9.4 C (15.1 F)
1960
-11.7 C (10.9 F)
1961
-6.7 C (19.9 F)
1962
-10.6 C (12.9 F)
1963
-12.2 C (10.0 F)
1964
-8.3 C (17.1 F)
1965
-10.0 C (14.0 F)
1966
-9.4 C (15.1 F)
1967
-11.7 C (10.9 F)
1968
-13.3 C (8.1 F)
1969
-11.1 C (12.0 F)
1970
-10.0 C (14.0 F)
1971
-10.6 C (12.9 F)
1972
-13.3 C (8.1 F)
1973
-11.7 C (10.9 F)
1974
-11.1 C (12.0 F)
1975
-11.1 C (12.0 F)
1976
-11.7 C (10.9 F)
1977
-10.0 C (14.0 F)
1978
-12.2 C (10.0 F)
1979
-12.2 C (10.0 F)
1980
-10.6 C (12.9 F)
1981
-6.1 C (21.0 F)
1982
-11.1 C (12.0 F)
1983
-10.6 C (12.9 F)
1984
-9.4 C (15.1 F)
1985
-10.6 C (12.9 F)
1986
-7.2 C (19.0 F)
1987
-11.7 C (10.9 F)
1988
-11.1 C (12.0 F)
1989
-12.2 C (10.0 F)
1990
-14.4 C (6.1 F)
1991
-10.6 C (12.9 F)
1992
-8.3 C (17.1 F)
1993
-8.3 C (17.1 F)
1994
-9.4 C (15.1 F)
1995
-6.1 C (21.0 F)
1996
-9.4 C (15.1 F)
1997
-7.8 C (18.0 F)
1998
-11.1 C (12.0 F)
1999
-10.0 C (14.0 F)
2000
-6.7 C (19.9 F)
2001
-6.1 C (21.0 F)
2002
-9.4 C (15.1 F)
2003
-8.3 C (17.1 F)
2004
-7.8 C (18.0 F)
2005
-10.0 C (14.0 F)
2006
-10.0 C (14.0 F)
2007
-14.4 C (6.1 F)
2008
-8.3 C (17.1 F)
2009
-7.8 C (18.0 F)
Wettest day (Rx1day)
The wettest day of the year at Lake Arrowhead, 1941 to 2009. The record is 361.7 mm (14.2 in) in 1969, marked on the chart; the median year is 130.0 mm (5.1 in).
Wettest day (Rx1day) at Lake Arrowhead by year
Year
Wettest day (Rx1day)
1941
85.3 mm (3.4 in)
1942
58.9 mm (2.3 in)
1943
318.8 mm (12.6 in)
1944
213.1 mm (8.4 in)
1945
199.4 mm (7.9 in)
1946
174.0 mm (6.9 in)
1947
56.9 mm (2.2 in)
1948
80.5 mm (3.2 in)
1949
110.5 mm (4.4 in)
1950
90.4 mm (3.6 in)
1951
174.0 mm (6.9 in)
1952
175.8 mm (6.9 in)
1953
56.6 mm (2.2 in)
1954
189.2 mm (7.4 in)
1955
75.2 mm (3.0 in)
1956
171.5 mm (6.8 in)
1957
138.2 mm (5.4 in)
1958
139.4 mm (5.5 in)
1959
114.8 mm (4.5 in)
1960
98.0 mm (3.9 in)
1961
154.2 mm (6.1 in)
1962
106.7 mm (4.2 in)
1963
101.1 mm (4.0 in)
1964
75.2 mm (3.0 in)
1965
180.1 mm (7.1 in)
1966
283.0 mm (11.1 in)
1967
127.5 mm (5.0 in)
1968
99.6 mm (3.9 in)
1969
361.7 mm (14.2 in)
1970
149.4 mm (5.9 in)
1971
172.5 mm (6.8 in)
1972
67.3 mm (2.6 in)
1973
137.7 mm (5.4 in)
1974
111.8 mm (4.4 in)
1975
50.8 mm (2.0 in)
1976
141.7 mm (5.6 in)
1977
124.7 mm (4.9 in)
1978
193.3 mm (7.6 in)
1979
110.0 mm (4.3 in)
1980
159.0 mm (6.3 in)
1981
88.9 mm (3.5 in)
1982
187.5 mm (7.4 in)
1983
166.6 mm (6.6 in)
1984
92.7 mm (3.6 in)
1985
101.1 mm (4.0 in)
1986
152.4 mm (6.0 in)
1987
84.1 mm (3.3 in)
1988
114.0 mm (4.5 in)
1989
112.3 mm (4.4 in)
1990
96.5 mm (3.8 in)
1991
211.1 mm (8.3 in)
1992
162.6 mm (6.4 in)
1993
161.3 mm (6.4 in)
1994
123.2 mm (4.9 in)
1995
182.9 mm (7.2 in)
1996
158.0 mm (6.2 in)
1997
95.3 mm (3.8 in)
1998
130.0 mm (5.1 in)
1999
40.1 mm (1.6 in)
2000
77.5 mm (3.1 in)
2001
116.8 mm (4.6 in)
2002
99.1 mm (3.9 in)
2003
170.2 mm (6.7 in)
2004
238.8 mm (9.4 in)
2005
221.0 mm (8.7 in)
2006
152.4 mm (6.0 in)
2007
139.7 mm (5.5 in)
2008
186.7 mm (7.4 in)
2009
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Lake Arrowhead, 1941 to 2009. The record is 806.5 mm (31.8 in) in 2005, marked on the chart; the median year is 228.6 mm (9.0 in).
Wettest five days (Rx5day) at Lake Arrowhead by year
Year
Wettest five days (Rx5day)
1941
123.2 mm (4.9 in)
1942
121.8 mm (4.8 in)
1943
560.4 mm (22.1 in)
1944
389.2 mm (15.3 in)
1945
417.8 mm (16.4 in)
1946
276.6 mm (10.9 in)
1947
107.9 mm (4.2 in)
1948
125.2 mm (4.9 in)
1949
180.9 mm (7.1 in)
1950
143.4 mm (5.6 in)
1951
299.6 mm (11.8 in)
1952
374.4 mm (14.7 in)
1953
65.8 mm (2.6 in)
1954
265.2 mm (10.4 in)
1955
109.3 mm (4.3 in)
1956
350.0 mm (13.8 in)
1957
259.5 mm (10.2 in)
1958
262.1 mm (10.3 in)
1959
214.6 mm (8.4 in)
1960
158.2 mm (6.2 in)
1961
177.3 mm (7.0 in)
1962
270.0 mm (10.6 in)
1963
156.7 mm (6.2 in)
1964
131.8 mm (5.2 in)
1965
472.2 mm (18.6 in)
1966
704.6 mm (27.7 in)
1967
234.8 mm (9.2 in)
1968
109.3 mm (4.3 in)
1969
746.3 mm (29.4 in)
1970
204.0 mm (8.0 in)
1971
415.3 mm (16.4 in)
1972
127.0 mm (5.0 in)
1973
228.8 mm (9.0 in)
1974
383.1 mm (15.1 in)
1975
102.3 mm (4.0 in)
1976
288.7 mm (11.4 in)
1977
301.2 mm (11.9 in)
1978
501.2 mm (19.7 in)
1979
196.2 mm (7.7 in)
1980
370.9 mm (14.6 in)
1981
152.2 mm (6.0 in)
1982
283.9 mm (11.2 in)
1983
340.1 mm (13.4 in)
1984
227.6 mm (9.0 in)
1985
160.0 mm (6.3 in)
1986
251.0 mm (9.9 in)
1987
171.2 mm (6.7 in)
1988
149.5 mm (5.9 in)
1989
142.3 mm (5.6 in)
1990
175.3 mm (6.9 in)
1991
375.2 mm (14.8 in)
1992
271.0 mm (10.7 in)
1993
409.5 mm (16.1 in)
1994
252.2 mm (9.9 in)
1995
384.0 mm (15.1 in)
1996
315.2 mm (12.4 in)
1997
95.3 mm (3.8 in)
1998
205.3 mm (8.1 in)
1999
75.6 mm (3.0 in)
2000
192.9 mm (7.6 in)
2001
161.3 mm (6.4 in)
2002
228.6 mm (9.0 in)
2003
215.2 mm (8.5 in)
2004
367.8 mm (14.5 in)
2005
806.5 mm (31.8 in)
2006
208.3 mm (8.2 in)
2007
74.9 mm (2.9 in)
2008
454.7 mm (17.9 in)
2009
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at Lake Arrowhead, 1941 to 2009. The record is 195 days in 2002, marked on the chart; the median year is 82 days.
Longest dry spell (CDD) at Lake Arrowhead by year
Year
Longest dry spell (CDD)
1941
56 days
1942
75 days
1943
165 days
1944
155 days
1945
56 days
1946
71 days
1947
105 days
1948
108 days
1949
139 days
1950
51 days
1951
64 days
1952
87 days
1953
74 days
1954
71 days
1955
92 days
1956
75 days
1957
122 days
1958
92 days
1959
88 days
1960
76 days
1961
103 days
1962
84 days
1963
55 days
1964
107 days
1965
33 days
1966
71 days
1967
51 days
1968
53 days
1969
74 days
1970
46 days
1971
90 days
1972
67 days
1973
155 days
1974
161 days
1975
110 days
1976
84 days
1977
82 days
1978
99 days
1979
69 days
1980
69 days
1981
76 days
1982
44 days
1983
66 days
1984
34 days
1985
47 days
1986
98 days
1987
51 days
1988
86 days
1989
123 days
1990
99 days
1991
120 days
1992
102 days
1993
126 days
1994
105 days
1995
71 days
1996
66 days
1997
33 days
1998
59 days
1999
52 days
2000
104 days
2001
171 days
2002
195 days
2003
92 days
2004
48 days
2005
133 days
2006
118 days
2007
68 days
2008
126 days
2009
51 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
51 years with a frost
Across 51 years with a frost, the median last spring frost at Lake Arrowhead falls on 14 May and the median first autumn frost on 29 October, which leaves a median of 166 days between them.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
Frost dates and growing season at Lake Arrowhead
Measure
Median, all years
Earliest period
Recent period (1966 to 2006)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
12 May
n/a
-1.3 days per decade
First autumn frost
29 October
n/a
30 October
n/a
+0.3 days per decade
Growing days
166 days
n/a
164 days
n/a
+1.6 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
59 years, 1942 to 2008
A day with at least 132.4 mm (5.2 in) of rain is expected about once in 2 years. A day with at least 324.3 mm (12.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Lake Arrowhead: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
132.4 mm (5.2 in)
5 years
187.0 mm (7.4 in)
10 years
221.9 mm (8.7 in)
25 years
264.4 mm (10.4 in)
50 years
294.9 mm (11.6 in)
100 years
324.3 mm (12.8 in)
Longer than the 59 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, 59 years of values from 1942 to 2008.
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: 361.7 mm (14.2 in) in 1969; 318.8 mm (12.6 in) in 1943; 283.0 mm (11.1 in) in 1966.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Lake Arrowhead, at 1947. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1947 ran 0.4 C (0.7 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Lake Arrowhead, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1947
-0.4
-0.7
possible
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Lake Arrowhead standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Lake Arrowhead 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.