Record envelope, standing records and threshold days for Diamond Springs (USC00442368), Virginia, United States, with 72 years of record.
Key Facts for Diamond Springs
Diamond Springs (USC00442368) is a weather station in Virginia, United States at 36.90 latitude and -76.20 longitude, 9 m (30 ft) above sea level.
The station reports from 1909 to 1980, 72 years of record.
1,464 records set at Diamond Springs still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Diamond Springs set a daily record low maximum temperature of -2.2 C (28.0 F) on 26 December 1980.
About the Station
Location: Virginia, United States, 36.90 latitude, -76.20 longitude.
Elevation: 9 m (30 ft).
Period of record: 1909 to 1980, 72 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 Diamond Springs. 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 Diamond Springs, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.1 C (79.0 F)
-15.6 C (3.9 F)
n/a
n/a
Feb
28.9 C (84.0 F)
-15.0 C (5.0 F)
n/a
n/a
Mar
33.9 C (93.0 F)
-10.0 C (14.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-5.0 C (23.0 F)
n/a
n/a
May
38.3 C (100.9 F)
1.7 C (35.1 F)
n/a
n/a
Jun
41.1 C (106.0 F)
6.7 C (44.1 F)
n/a
n/a
Jul
40.6 C (105.1 F)
10.0 C (50.0 F)
n/a
n/a
Aug
40.0 C (104.0 F)
10.6 C (51.1 F)
n/a
n/a
Sep
38.9 C (102.0 F)
5.0 C (41.0 F)
n/a
n/a
Oct
36.7 C (98.1 F)
-2.2 C (28.0 F)
n/a
n/a
Nov
30.0 C (86.0 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
27.8 C (82.0 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 Diamond Springs still stand. 1941 holds the most, with 43.
Standing records at Diamond Springs by the year they were set
Year set
Standing records
1909
27
1910
22
1911
25
1912
29
1913
22
1914
32
1915
20
1916
15
1917
35
1918
32
1919
21
1920
18
1921
13
1922
22
1923
21
1924
19
1925
11
1926
26
1927
21
1928
6
1929
21
1930
25
1931
26
1932
29
1933
27
1934
21
1935
25
1936
26
1937
21
1938
15
1939
31
1940
23
1941
43
1942
35
1943
25
1944
19
1945
34
1946
16
1947
28
1948
18
1949
4
1950
23
1951
24
1952
16
1953
7
1954
15
1955
9
1956
16
1957
17
1958
6
1959
19
1960
24
1961
19
1962
14
1963
21
1964
27
1965
20
1966
20
1967
28
1968
8
1969
8
1970
17
1971
10
1972
18
1973
14
1974
20
1975
11
1976
25
1977
18
1978
11
1979
14
1980
16
All-Time Record Progression
6 new records
6 all-time records were set at Diamond Springs between 27 July 1940 and 7 February 1980. Each dot is a new record.
When Diamond Springs set new all-time records
Date
Kind
Detail
1940-07-27
Record high maximum temperature
Record high maximum temperature 40.6 C (105.1 F)
1944-06-19
Record high maximum temperature
Record high maximum temperature 41.1 C (106.0 F)
1959-09-28
Record daily precipitation
Record daily precipitation 172.0 mm (6.8 in)
1964-09-01
Record daily precipitation
Record daily precipitation 317.5 mm (12.5 in)
1977-01-17
Record low minimum temperature
Record low minimum temperature -15.6 C (3.9 F)
1980-02-07
Record daily snowfall
Record daily snowfall 30.5 cm (12.0 in)
Wettest Day of Each Month
Sep: 317.5 mm (12.5 in)
The wettest day on record for each calendar month at Diamond Springs. The most was 317.5 mm (12.5 in) on 1 September 1964.
Record daily precipitation for each month at Diamond Springs
Month
Record daily precipitation (mm)
Date
Jan
154.9 mm (6.1 in)
29 January 1937
Feb
91.4 mm (3.6 in)
4 February 1920
Mar
73.7 mm (2.9 in)
19 March 1958
Apr
78.7 mm (3.1 in)
9 April 1938
May
111.3 mm (4.4 in)
25 May 1980
Jun
162.1 mm (6.4 in)
3 June 1963
Jul
129.5 mm (5.1 in)
26 July 1935
Aug
138.2 mm (5.4 in)
14 August 1953
Sep
317.5 mm (12.5 in)
1 September 1964
Oct
115.6 mm (4.6 in)
1 October 1929
Nov
86.4 mm (3.4 in)
13 November 1937
Dec
88.9 mm (3.5 in)
4 December 1927
Period of Record Coverage
1909 to 1980
Complete yearUnder 90 percent of days
72 years of record at Diamond Springs, 1909 to 1980. 2 years have data for under 90 percent of days and are left out of rankings: 1909, 1918.
Cooler than the station meanWarmer than the station mean
One stripe for each of 69 complete years at Diamond Springs, 1911 to 1980. Blue stripes are years cooler than the station's own mean of 15.6 C (60.0 F); red stripes are warmer. The coolest year was 1969, at 14.1 C (57.3 F), and the warmest was 1933, at 17.2 C (63.0 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Diamond Springs as warming stripes, 1911 to 1980
Year
Annual mean temperature
Difference from the station mean
1911
15.8 C
+0.21 C
1912
15.2 C
-0.35 C
1913
16.2 C
+0.60 C
1914
15.2 C
-0.34 C
1915
15.3 C
-0.26 C
1916
15.6 C
+0.06 C
1917
14.1 C
-1.42 C
1919
15.8 C
+0.20 C
1920
14.8 C
-0.77 C
1921
16.6 C
+1.01 C
1922
15.8 C
+0.28 C
1923
15.7 C
+0.18 C
1924
15.1 C
-0.51 C
1925
15.8 C
+0.23 C
1926
15.6 C
+0.05 C
1927
15.5 C
-0.04 C
1928
15.4 C
-0.12 C
1929
16.0 C
+0.45 C
1930
15.9 C
+0.37 C
1931
16.6 C
+1.01 C
1932
16.9 C
+1.37 C
1933
17.2 C
+1.68 C
1934
16.4 C
+0.81 C
1935
15.3 C
-0.26 C
1936
15.6 C
-0.01 C
1937
15.5 C
-0.06 C
1938
16.3 C
+0.70 C
1939
16.8 C
+1.25 C
1940
14.9 C
-0.66 C
1941
16.2 C
+0.68 C
1942
16.4 C
+0.84 C
1943
16.2 C
+0.63 C
1944
16.1 C
+0.52 C
1945
16.7 C
+1.14 C
1946
16.7 C
+1.14 C
1947
15.9 C
+0.29 C
1948
15.8 C
+0.25 C
1949
16.7 C
+1.16 C
1950
15.7 C
+0.09 C
1951
16.2 C
+0.59 C
1952
16.2 C
+0.60 C
1953
16.7 C
+1.10 C
1954
16.2 C
+0.61 C
1955
15.6 C
0.00 C
1956
15.9 C
+0.35 C
1957
16.3 C
+0.73 C
1958
14.8 C
-0.80 C
1959
16.3 C
+0.69 C
1960
15.3 C
-0.22 C
1961
15.6 C
+0.04 C
1962
14.5 C
-1.11 C
1963
14.3 C
-1.31 C
1964
15.3 C
-0.26 C
1965
14.9 C
-0.64 C
1966
14.4 C
-1.21 C
1967
14.2 C
-1.38 C
1968
14.6 C
-0.98 C
1969
14.1 C
-1.51 C
1970
14.6 C
-1.01 C
1971
15.2 C
-0.39 C
1972
14.6 C
-0.97 C
1973
15.4 C
-0.20 C
1974
15.1 C
-0.48 C
1975
15.6 C
+0.01 C
1976
14.5 C
-1.02 C
1977
14.9 C
-0.68 C
1978
14.3 C
-1.24 C
1979
14.8 C
-0.74 C
1980
14.7 C
-0.82 C
The annual mean temperature here has fallen by 0.2 C (0.1 to 0.2) per decade over 1911 to 1980. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 69 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Diamond Springs
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.2 C (-0.2 to -0.1) per decade
-0.3 F (-0.4 to -0.1) per decade
1911 to 1980
69
Fall
Mean daily maximum
-0.3 C (-0.4 to -0.2) per decade
-0.5 F (-0.7 to -0.3) per decade
1911 to 1980
69
Fall
Mean daily minimum
-0.01 C (-0.09 to 0.07) per decade
-0.02 F (-0.16 to 0.12) per decade
1911 to 1980
69
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
1909 to 1980
Yearly extremes at Diamond Springs: 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)
1944
36.1 C (97.0 F)
72
Coldest night (TNn)
-15.6 C (3.9 F)
1977
-10.0 C (14.0 F)
72
Wettest day (Rx1day)
317.5 mm (12.5 in)
1964
80.2 mm (3.2 in)
72
Wettest five days (Rx5day)
329.4 mm (13.0 in)
1964
122.2 mm (4.8 in)
72
Longest dry spell (CDD)
41 days
1931
21 days
72
Hottest day (TXx)
The hottest day of the year at Diamond Springs, 1909 to 1980. The record is 41.1 C (106.0 F) in 1944, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Diamond Springs by year
Year
Hottest day (TXx)
1909
36.1 C (97.0 F)
1910
35.0 C (95.0 F)
1911
37.8 C (100.0 F)
1912
36.7 C (98.1 F)
1913
37.2 C (99.0 F)
1914
37.8 C (100.0 F)
1915
38.3 C (100.9 F)
1916
36.7 C (98.1 F)
1917
39.4 C (102.9 F)
1918
39.4 C (102.9 F)
1919
36.1 C (97.0 F)
1920
33.9 C (93.0 F)
1921
36.7 C (98.1 F)
1922
35.0 C (95.0 F)
1923
36.1 C (97.0 F)
1924
35.0 C (95.0 F)
1925
36.1 C (97.0 F)
1926
37.8 C (100.0 F)
1927
35.0 C (95.0 F)
1928
35.0 C (95.0 F)
1929
34.4 C (93.9 F)
1930
38.9 C (102.0 F)
1931
36.7 C (98.1 F)
1932
38.9 C (102.0 F)
1933
37.2 C (99.0 F)
1934
36.1 C (97.0 F)
1935
34.4 C (93.9 F)
1936
37.8 C (100.0 F)
1937
35.6 C (96.1 F)
1938
36.7 C (98.1 F)
1939
38.3 C (100.9 F)
1940
40.6 C (105.1 F)
1941
38.9 C (102.0 F)
1942
40.0 C (104.0 F)
1943
37.2 C (99.0 F)
1944
41.1 C (106.0 F)
1945
38.9 C (102.0 F)
1946
37.2 C (99.0 F)
1947
38.9 C (102.0 F)
1948
37.2 C (99.0 F)
1949
37.2 C (99.0 F)
1950
36.1 C (97.0 F)
1951
35.6 C (96.1 F)
1952
40.0 C (104.0 F)
1953
36.1 C (97.0 F)
1954
37.2 C (99.0 F)
1955
35.6 C (96.1 F)
1956
36.1 C (97.0 F)
1957
37.8 C (100.0 F)
1958
35.0 C (95.0 F)
1959
35.6 C (96.1 F)
1960
36.1 C (97.0 F)
1961
35.0 C (95.0 F)
1962
35.0 C (95.0 F)
1963
35.6 C (96.1 F)
1964
38.3 C (100.9 F)
1965
35.0 C (95.0 F)
1966
36.1 C (97.0 F)
1967
34.4 C (93.9 F)
1968
36.1 C (97.0 F)
1969
35.6 C (96.1 F)
1970
35.0 C (95.0 F)
1971
35.0 C (95.0 F)
1972
35.0 C (95.0 F)
1973
33.9 C (93.0 F)
1974
34.4 C (93.9 F)
1975
35.0 C (95.0 F)
1976
35.6 C (96.1 F)
1977
37.8 C (100.0 F)
1978
35.6 C (96.1 F)
1979
35.6 C (96.1 F)
1980
39.4 C (102.9 F)
Coldest night (TNn)
The coldest night of the year at Diamond Springs, 1909 to 1980. The record is -15.6 C (3.9 F) in 1977, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at Diamond Springs by year
Year
Coldest night (TNn)
1909
-11.1 C (12.0 F)
1910
-10.0 C (14.0 F)
1911
-7.2 C (19.0 F)
1912
-15.0 C (5.0 F)
1913
-6.7 C (19.9 F)
1914
-10.0 C (14.0 F)
1915
-7.2 C (19.0 F)
1916
-8.9 C (16.0 F)
1917
-13.3 C (8.1 F)
1918
-13.3 C (8.1 F)
1919
-11.7 C (10.9 F)
1920
-10.0 C (14.0 F)
1921
-7.2 C (19.0 F)
1922
-10.0 C (14.0 F)
1923
-7.8 C (18.0 F)
1924
-11.1 C (12.0 F)
1925
-12.2 C (10.0 F)
1926
-7.8 C (18.0 F)
1927
-10.6 C (12.9 F)
1928
-10.0 C (14.0 F)
1929
-10.0 C (14.0 F)
1930
-8.9 C (16.0 F)
1931
-8.9 C (16.0 F)
1932
-7.2 C (19.0 F)
1933
-7.8 C (18.0 F)
1934
-12.8 C (9.0 F)
1935
-12.8 C (9.0 F)
1936
-13.3 C (8.1 F)
1937
-10.0 C (14.0 F)
1938
-7.8 C (18.0 F)
1939
-6.7 C (19.9 F)
1940
-12.2 C (10.0 F)
1941
-6.7 C (19.9 F)
1942
-13.3 C (8.1 F)
1943
-10.6 C (12.9 F)
1944
-10.6 C (12.9 F)
1945
-8.3 C (17.1 F)
1946
-7.8 C (18.0 F)
1947
-10.0 C (14.0 F)
1948
-10.0 C (14.0 F)
1949
-3.9 C (25.0 F)
1950
-8.3 C (17.1 F)
1951
-8.9 C (16.0 F)
1952
-8.3 C (17.1 F)
1953
-5.6 C (21.9 F)
1954
-7.8 C (18.0 F)
1955
-8.3 C (17.1 F)
1956
-5.6 C (21.9 F)
1957
-10.0 C (14.0 F)
1958
-11.7 C (10.9 F)
1959
-9.4 C (15.1 F)
1960
-10.0 C (14.0 F)
1961
-10.6 C (12.9 F)
1962
-11.1 C (12.0 F)
1963
-9.4 C (15.1 F)
1964
-7.2 C (19.0 F)
1965
-12.2 C (10.0 F)
1966
-11.7 C (10.9 F)
1967
-10.0 C (14.0 F)
1968
-10.0 C (14.0 F)
1969
-7.2 C (19.0 F)
1970
-13.3 C (8.1 F)
1971
-11.1 C (12.0 F)
1972
-15.0 C (5.0 F)
1973
-10.0 C (14.0 F)
1974
-5.6 C (21.9 F)
1975
-6.7 C (19.9 F)
1976
-8.9 C (16.0 F)
1977
-15.6 C (3.9 F)
1978
-11.1 C (12.0 F)
1979
-10.0 C (14.0 F)
1980
-11.1 C (12.0 F)
Wettest day (Rx1day)
The wettest day of the year at Diamond Springs, 1909 to 1980. The record is 317.5 mm (12.5 in) in 1964, marked on the chart; the median year is 80.2 mm (3.2 in).
Wettest day (Rx1day) at Diamond Springs by year
Year
Wettest day (Rx1day)
1909
54.1 mm (2.1 in)
1910
50.8 mm (2.0 in)
1911
39.9 mm (1.6 in)
1912
58.4 mm (2.3 in)
1913
78.2 mm (3.1 in)
1914
74.9 mm (2.9 in)
1915
79.8 mm (3.1 in)
1916
68.8 mm (2.7 in)
1917
97.8 mm (3.9 in)
1918
95.3 mm (3.8 in)
1919
53.3 mm (2.1 in)
1920
91.4 mm (3.6 in)
1921
54.6 mm (2.1 in)
1922
76.2 mm (3.0 in)
1923
52.1 mm (2.1 in)
1924
114.3 mm (4.5 in)
1925
68.6 mm (2.7 in)
1926
78.7 mm (3.1 in)
1927
97.8 mm (3.9 in)
1928
133.4 mm (5.3 in)
1929
115.6 mm (4.6 in)
1930
45.7 mm (1.8 in)
1931
78.7 mm (3.1 in)
1932
72.4 mm (2.9 in)
1933
133.4 mm (5.3 in)
1934
86.4 mm (3.4 in)
1935
129.5 mm (5.1 in)
1936
100.3 mm (3.9 in)
1937
154.9 mm (6.1 in)
1938
78.7 mm (3.1 in)
1939
77.5 mm (3.1 in)
1940
115.1 mm (4.5 in)
1941
57.2 mm (2.3 in)
1942
72.4 mm (2.9 in)
1943
84.6 mm (3.3 in)
1944
129.8 mm (5.1 in)
1945
128.3 mm (5.1 in)
1946
57.2 mm (2.3 in)
1947
50.5 mm (2.0 in)
1948
72.4 mm (2.9 in)
1949
63.5 mm (2.5 in)
1950
81.0 mm (3.2 in)
1951
62.7 mm (2.5 in)
1952
83.8 mm (3.3 in)
1953
138.2 mm (5.4 in)
1954
66.8 mm (2.6 in)
1955
106.2 mm (4.2 in)
1956
80.5 mm (3.2 in)
1957
78.7 mm (3.1 in)
1958
98.8 mm (3.9 in)
1959
172.0 mm (6.8 in)
1960
97.8 mm (3.9 in)
1961
92.7 mm (3.6 in)
1962
96.8 mm (3.8 in)
1963
162.1 mm (6.4 in)
1964
317.5 mm (12.5 in)
1965
47.8 mm (1.9 in)
1966
51.1 mm (2.0 in)
1967
102.9 mm (4.1 in)
1968
75.7 mm (3.0 in)
1969
117.6 mm (4.6 in)
1970
81.0 mm (3.2 in)
1971
89.9 mm (3.5 in)
1972
72.1 mm (2.8 in)
1973
55.9 mm (2.2 in)
1974
127.8 mm (5.0 in)
1975
130.3 mm (5.1 in)
1976
52.8 mm (2.1 in)
1977
72.6 mm (2.9 in)
1978
97.0 mm (3.8 in)
1979
79.5 mm (3.1 in)
1980
111.3 mm (4.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Diamond Springs, 1909 to 1980. The record is 329.4 mm (13.0 in) in 1964, marked on the chart; the median year is 122.2 mm (4.8 in).
Wettest five days (Rx5day) at Diamond Springs by year
Year
Wettest five days (Rx5day)
1909
93.9 mm (3.7 in)
1910
104.7 mm (4.1 in)
1911
79.9 mm (3.1 in)
1912
71.1 mm (2.8 in)
1913
109.0 mm (4.3 in)
1914
76.8 mm (3.0 in)
1915
100.4 mm (4.0 in)
1916
99.2 mm (3.9 in)
1917
183.1 mm (7.2 in)
1918
88.6 mm (3.5 in)
1919
120.2 mm (4.7 in)
1920
142.5 mm (5.6 in)
1921
117.6 mm (4.6 in)
1922
137.1 mm (5.4 in)
1923
105.4 mm (4.1 in)
1924
125.8 mm (5.0 in)
1925
86.4 mm (3.4 in)
1926
88.9 mm (3.5 in)
1927
155.3 mm (6.1 in)
1928
177.9 mm (7.0 in)
1929
137.2 mm (5.4 in)
1930
104.7 mm (4.1 in)
1931
110.4 mm (4.3 in)
1932
72.4 mm (2.9 in)
1933
214.7 mm (8.5 in)
1934
152.5 mm (6.0 in)
1935
137.1 mm (5.4 in)
1936
100.3 mm (3.9 in)
1937
172.7 mm (6.8 in)
1938
129.5 mm (5.1 in)
1939
165.8 mm (6.5 in)
1940
182.1 mm (7.2 in)
1941
58.9 mm (2.3 in)
1942
188.9 mm (7.4 in)
1943
139.3 mm (5.5 in)
1944
160.4 mm (6.3 in)
1945
140.6 mm (5.5 in)
1946
123.4 mm (4.9 in)
1947
66.3 mm (2.6 in)
1948
139.3 mm (5.5 in)
1949
148.1 mm (5.8 in)
1950
141.4 mm (5.6 in)
1951
102.1 mm (4.0 in)
1952
100.6 mm (4.0 in)
1953
231.2 mm (9.1 in)
1954
117.3 mm (4.6 in)
1955
126.8 mm (5.0 in)
1956
123.9 mm (4.9 in)
1957
118.6 mm (4.7 in)
1958
144.3 mm (5.7 in)
1959
186.3 mm (7.3 in)
1960
116.6 mm (4.6 in)
1961
109.2 mm (4.3 in)
1962
127.0 mm (5.0 in)
1963
194.4 mm (7.7 in)
1964
329.4 mm (13.0 in)
1965
71.2 mm (2.8 in)
1966
79.0 mm (3.1 in)
1967
207.0 mm (8.1 in)
1968
95.3 mm (3.8 in)
1969
189.2 mm (7.4 in)
1970
102.6 mm (4.0 in)
1971
222.7 mm (8.8 in)
1972
80.0 mm (3.1 in)
1973
82.6 mm (3.3 in)
1974
177.8 mm (7.0 in)
1975
136.1 mm (5.4 in)
1976
67.5 mm (2.7 in)
1977
101.8 mm (4.0 in)
1978
118.4 mm (4.7 in)
1979
148.7 mm (5.9 in)
1980
121.0 mm (4.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Diamond Springs, 1909 to 1980. The record is 41 days in 1931, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Diamond Springs by year
Year
Longest dry spell (CDD)
1909
17 days
1910
26 days
1911
23 days
1912
18 days
1913
13 days
1914
21 days
1915
29 days
1916
25 days
1917
21 days
1918
39 days
1919
23 days
1920
27 days
1921
26 days
1922
18 days
1923
22 days
1924
26 days
1925
29 days
1926
23 days
1927
14 days
1928
22 days
1929
19 days
1930
23 days
1931
41 days
1932
25 days
1933
17 days
1934
26 days
1935
17 days
1936
30 days
1937
19 days
1938
20 days
1939
20 days
1940
14 days
1941
21 days
1942
26 days
1943
20 days
1944
20 days
1945
14 days
1946
15 days
1947
18 days
1948
12 days
1949
15 days
1950
18 days
1951
11 days
1952
23 days
1953
20 days
1954
28 days
1955
14 days
1956
15 days
1957
20 days
1958
23 days
1959
21 days
1960
16 days
1961
23 days
1962
23 days
1963
17 days
1964
28 days
1965
21 days
1966
24 days
1967
18 days
1968
30 days
1969
18 days
1970
27 days
1971
15 days
1972
12 days
1973
25 days
1974
23 days
1975
13 days
1976
20 days
1977
17 days
1978
18 days
1979
12 days
1980
22 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
69 years with a frost
Across 69 years with a frost, the median last spring frost at Diamond Springs falls on 28 March and the median first autumn frost on 14 November, which leaves a median of 228 days between them.
In 1951 to 1980 the median growing season was 231 days. That is 8 days more than in 1911 to 1941.
Fitted over all years, the growing season changes by +3.1 days per decade at this station.
Frost dates and growing season at Diamond Springs
Measure
Median, all years
Earliest period (1911 to 1941)
Recent period (1951 to 1980)
Recent against earliest
Fitted trend
Last spring frost
28 March
1 April
26 March
6 days earlier
-2.0 days per decade
First autumn frost
14 November
12 November
16 November
4 days later
+1.1 days per decade
Growing days
228 days
223 days
231 days
8 days more
+3.1 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, 1910 to 1980
A day with at least 83.2 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 232.4 mm (9.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Diamond Springs: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
83.2 mm (3.3 in)
5 years
115.2 mm (4.5 in)
10 years
139.2 mm (5.5 in)
25 years
173.3 mm (6.8 in)
50 years
201.5 mm (7.9 in)
100 years
232.4 mm (9.1 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 1910 to 1980.
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: 317.5 mm (12.5 in) in 1964; 172.0 mm (6.8 in) in 1959; 162.1 mm (6.4 in) in 1963.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Diamond Springs, at 1962. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1962 ran 0.3 C (0.5 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Diamond Springs, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1962
-0.2
-0.4
likely
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 Diamond Springs standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Diamond Springs 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.