Record envelope, standing records and threshold days for Clarksburg (USC00041784), California, United States, with 40 years of record.
Key Facts for Clarksburg
Clarksburg (USC00041784) is a weather station in California, United States at 38.42 latitude and -121.53 longitude, 3 m (10 ft) above sea level.
The station reports from 1935 to 1974, 40 years of record.
1,464 records set at Clarksburg still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
Clarksburg set a daily record precipitation of 18.3 mm (0.7 in) on 8 November 1974.
About the Station
Location: California, United States, 38.42 latitude, -121.53 longitude.
Elevation: 3 m (10 ft).
Period of record: 1935 to 1974, 40 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 Clarksburg. 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 Clarksburg, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
21.1 C (70.0 F)
-7.2 C (19.0 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-4.4 C (24.1 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-4.4 C (24.1 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-1.1 C (30.0 F)
n/a
n/a
May
42.2 C (108.0 F)
1.1 C (34.0 F)
n/a
n/a
Jun
43.9 C (111.0 F)
2.8 C (37.0 F)
n/a
n/a
Jul
44.4 C (111.9 F)
6.1 C (43.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
4.4 C (39.9 F)
n/a
n/a
Sep
43.3 C (109.9 F)
2.8 C (37.0 F)
n/a
n/a
Oct
38.3 C (100.9 F)
-2.8 C (27.0 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
25.6 C (78.1 F)
-6.7 C (19.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clarksburg still stand. 1936 holds the most, with 74.
Standing records at Clarksburg by the year they were set
Year set
Standing records
1935
41
1936
74
1937
46
1938
31
1939
55
1940
33
1941
36
1942
28
1943
40
1944
70
1945
41
1946
31
1947
36
1948
50
1949
40
1950
70
1951
32
1952
33
1953
44
1954
29
1955
51
1956
22
1957
33
1959
26
1960
32
1961
43
1962
29
1963
45
1964
34
1965
42
1966
32
1967
24
1968
26
1969
15
1970
27
1971
39
1972
49
1973
17
1974
18
All-Time Record Progression
1 new records
1 all-time records were set at Clarksburg between 15 July 1972 and 15 July 1972. Each dot is a new record.
When Clarksburg set new all-time records
Date
Kind
Detail
1972-07-15
Record high maximum temperature
Record high maximum temperature 44.4 C (111.9 F)
Wettest Day of Each Month
Oct: 97.0 mm (3.8 in)
The wettest day on record for each calendar month at Clarksburg. The most was 97.0 mm (3.8 in) on 13 October 1962.
Record daily precipitation for each month at Clarksburg
Month
Record daily precipitation (mm)
Date
Jan
65.0 mm (2.6 in)
12 January 1952
Feb
69.9 mm (2.8 in)
4 February 1937
Mar
48.8 mm (1.9 in)
22 March 1937
Apr
39.6 mm (1.6 in)
7 April 1935
May
26.2 mm (1.0 in)
30 May 1948
Jun
13.5 mm (0.5 in)
6 June 1953
Jul
2.8 mm (0.11 in)
31 July 1966
Aug
13.2 mm (0.5 in)
12 August 1965
Sep
27.2 mm (1.1 in)
18 September 1959
Oct
97.0 mm (3.8 in)
13 October 1962
Nov
70.1 mm (2.8 in)
29 November 1970
Dec
53.3 mm (2.1 in)
25 December 1955
Period of Record Coverage
1935 to 1974
Complete yearUnder 90 percent of days
39 years of record at Clarksburg, 1935 to 1974. 4 years have data for under 90 percent of days and are left out of rankings: 1935, 1968, 1973, 1974.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Clarksburg, 1936 to 1972. Blue stripes are years cooler than the station's own mean of 15.1 C (59.3 F); red stripes are warmer. The coolest year was 1971, at 13.9 C (57.1 F), and the warmest was 1936, at 16.3 C (61.4 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Clarksburg as warming stripes, 1936 to 1972
Year
Annual mean temperature
Difference from the station mean
1936
16.3 C
+1.17 C
1937
15.3 C
+0.16 C
1938
15.1 C
-0.05 C
1939
15.9 C
+0.78 C
1940
15.8 C
+0.69 C
1941
15.1 C
-0.05 C
1942
14.9 C
-0.22 C
1943
15.0 C
-0.17 C
1944
14.1 C
-1.05 C
1945
15.3 C
+0.15 C
1946
14.6 C
-0.50 C
1947
15.3 C
+0.11 C
1948
14.3 C
-0.88 C
1949
14.9 C
-0.27 C
1950
16.0 C
+0.85 C
1951
15.6 C
+0.46 C
1952
15.5 C
+0.38 C
1953
15.5 C
+0.40 C
1954
15.2 C
+0.04 C
1955
15.0 C
-0.10 C
1956
15.2 C
+0.01 C
1957
15.1 C
-0.03 C
1959
15.9 C
+0.78 C
1960
15.3 C
+0.18 C
1961
15.0 C
-0.12 C
1962
14.6 C
-0.56 C
1963
14.5 C
-0.60 C
1964
15.1 C
-0.06 C
1965
14.6 C
-0.58 C
1966
15.5 C
+0.37 C
1967
15.1 C
-0.02 C
1969
15.2 C
+0.01 C
1970
15.4 C
+0.26 C
1971
13.9 C
-1.21 C
1972
14.9 C
-0.28 C
The fitted trend in annual mean temperature here over 1936 to 1972 is -0.14 C (-0.30 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.25 F (-0.55 to 0.05) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Clarksburg
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.14 C (-0.30 to 0.03) per decade
-0.25 F (-0.55 to 0.05) per decade
1936 to 1972
35
Not clearly different from zero
Mean daily maximum
-0.3 C (-0.5 to -0.1) per decade
-0.5 F (-0.9 to -0.1) per decade
1936 to 1972
35
Fall
Mean daily minimum
0.00 C (-0.19 to 0.19) per decade
0.00 F (-0.33 to 0.34) per decade
1936 to 1972
35
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
1935 to 1974
Yearly extremes at Clarksburg: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
1972
41.1 C (106.0 F)
39
Coldest night (TNn)
-7.2 C (19.0 F)
1949
-4.4 C (24.1 F)
39
Wettest day (Rx1day)
97.0 mm (3.8 in)
1962
37.3 mm (1.5 in)
39
Wettest five days (Rx5day)
197.3 mm (7.8 in)
1962
75.2 mm (3.0 in)
39
Longest dry spell (CDD)
166 days
1971
123 days
39
Hottest day (TXx)
The hottest day of the year at Clarksburg, 1935 to 1974. The record is 44.4 C (111.9 F) in 1972, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Clarksburg by year
Year
Hottest day (TXx)
1935
42.8 C (109.0 F)
1936
41.7 C (107.1 F)
1937
41.7 C (107.1 F)
1938
40.0 C (104.0 F)
1939
42.2 C (108.0 F)
1940
41.1 C (106.0 F)
1941
40.6 C (105.1 F)
1942
42.2 C (108.0 F)
1943
42.2 C (108.0 F)
1944
42.2 C (108.0 F)
1945
42.8 C (109.0 F)
1946
43.3 C (109.9 F)
1947
40.6 C (105.1 F)
1948
42.2 C (108.0 F)
1949
40.0 C (104.0 F)
1950
43.3 C (109.9 F)
1951
41.7 C (107.1 F)
1952
39.4 C (102.9 F)
1953
40.6 C (105.1 F)
1954
42.8 C (109.0 F)
1955
43.3 C (109.9 F)
1956
41.1 C (106.0 F)
1957
40.6 C (105.1 F)
1959
41.1 C (106.0 F)
1960
41.1 C (106.0 F)
1961
43.9 C (111.0 F)
1962
39.4 C (102.9 F)
1963
38.3 C (100.9 F)
1964
39.4 C (102.9 F)
1965
36.7 C (98.1 F)
1966
40.6 C (105.1 F)
1967
39.4 C (102.9 F)
1968
40.6 C (105.1 F)
1969
39.4 C (102.9 F)
1970
40.0 C (104.0 F)
1971
41.7 C (107.1 F)
1972
44.4 C (111.9 F)
1973
39.4 C (102.9 F)
1974
37.8 C (100.0 F)
Coldest night (TNn)
The coldest night of the year at Clarksburg, 1935 to 1974. The record is -7.2 C (19.0 F) in 1949, marked on the chart; the median year is -4.4 C (24.1 F).
Coldest night (TNn) at Clarksburg by year
Year
Coldest night (TNn)
1935
-3.9 C (25.0 F)
1936
-4.4 C (24.1 F)
1937
-6.7 C (19.9 F)
1938
-3.9 C (25.0 F)
1939
-2.2 C (28.0 F)
1940
-6.1 C (21.0 F)
1941
-4.4 C (24.1 F)
1942
-5.6 C (21.9 F)
1943
-5.6 C (21.9 F)
1944
-4.4 C (24.1 F)
1945
-3.3 C (26.1 F)
1946
-3.9 C (25.0 F)
1947
-6.1 C (21.0 F)
1948
-5.0 C (23.0 F)
1949
-7.2 C (19.0 F)
1950
-6.1 C (21.0 F)
1951
-2.2 C (28.0 F)
1952
-2.2 C (28.0 F)
1953
-3.9 C (25.0 F)
1954
-2.8 C (27.0 F)
1955
-2.8 C (27.0 F)
1956
-6.7 C (19.9 F)
1957
-5.6 C (21.9 F)
1959
-3.9 C (25.0 F)
1960
-4.4 C (24.1 F)
1961
-4.4 C (24.1 F)
1962
-6.1 C (21.0 F)
1963
-7.2 C (19.0 F)
1964
-3.3 C (26.1 F)
1965
-5.6 C (21.9 F)
1966
-4.4 C (24.1 F)
1967
-3.3 C (26.1 F)
1968
-5.6 C (21.9 F)
1969
-3.9 C (25.0 F)
1970
-3.3 C (26.1 F)
1971
-5.6 C (21.9 F)
1972
-5.6 C (21.9 F)
1973
-3.9 C (25.0 F)
1974
-2.8 C (27.0 F)
Wettest day (Rx1day)
The wettest day of the year at Clarksburg, 1935 to 1974. The record is 97.0 mm (3.8 in) in 1962, marked on the chart; the median year is 37.3 mm (1.5 in).
Wettest day (Rx1day) at Clarksburg by year
Year
Wettest day (Rx1day)
1935
39.6 mm (1.6 in)
1936
52.8 mm (2.1 in)
1937
69.9 mm (2.8 in)
1938
37.6 mm (1.5 in)
1939
32.5 mm (1.3 in)
1940
58.4 mm (2.3 in)
1941
39.9 mm (1.6 in)
1942
49.5 mm (1.9 in)
1943
48.3 mm (1.9 in)
1944
53.6 mm (2.1 in)
1945
46.7 mm (1.8 in)
1946
26.4 mm (1.0 in)
1947
22.9 mm (0.9 in)
1948
36.1 mm (1.4 in)
1949
18.5 mm (0.7 in)
1950
37.3 mm (1.5 in)
1951
41.9 mm (1.6 in)
1952
65.0 mm (2.6 in)
1953
30.7 mm (1.2 in)
1954
49.0 mm (1.9 in)
1955
53.3 mm (2.1 in)
1956
27.4 mm (1.1 in)
1957
30.2 mm (1.2 in)
1959
27.2 mm (1.1 in)
1960
24.9 mm (1.0 in)
1961
34.3 mm (1.4 in)
1962
97.0 mm (3.8 in)
1963
48.8 mm (1.9 in)
1964
49.8 mm (2.0 in)
1965
25.7 mm (1.0 in)
1966
29.2 mm (1.1 in)
1967
46.5 mm (1.8 in)
1968
35.6 mm (1.4 in)
1969
34.3 mm (1.4 in)
1970
70.1 mm (2.8 in)
1971
18.5 mm (0.7 in)
1972
26.9 mm (1.1 in)
1973
33.8 mm (1.3 in)
1974
24.6 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clarksburg, 1935 to 1974. The record is 197.3 mm (7.8 in) in 1962, marked on the chart; the median year is 75.2 mm (3.0 in).
Wettest five days (Rx5day) at Clarksburg by year
Year
Wettest five days (Rx5day)
1935
64.5 mm (2.5 in)
1936
116.4 mm (4.6 in)
1937
91.4 mm (3.6 in)
1938
94.7 mm (3.7 in)
1939
52.8 mm (2.1 in)
1940
121.1 mm (4.8 in)
1941
68.4 mm (2.7 in)
1942
113.0 mm (4.4 in)
1943
129.6 mm (5.1 in)
1944
99.1 mm (3.9 in)
1945
119.9 mm (4.7 in)
1946
64.3 mm (2.5 in)
1947
56.5 mm (2.2 in)
1948
49.5 mm (1.9 in)
1949
35.5 mm (1.4 in)
1950
94.2 mm (3.7 in)
1951
80.0 mm (3.1 in)
1952
122.0 mm (4.8 in)
1953
45.7 mm (1.8 in)
1954
100.1 mm (3.9 in)
1955
166.8 mm (6.6 in)
1956
46.1 mm (1.8 in)
1957
55.6 mm (2.2 in)
1959
44.0 mm (1.7 in)
1960
48.5 mm (1.9 in)
1961
75.2 mm (3.0 in)
1962
197.3 mm (7.8 in)
1963
118.6 mm (4.7 in)
1964
80.8 mm (3.2 in)
1965
56.9 mm (2.2 in)
1966
70.9 mm (2.8 in)
1967
66.3 mm (2.6 in)
1968
50.6 mm (2.0 in)
1969
46.3 mm (1.8 in)
1970
101.7 mm (4.0 in)
1971
31.5 mm (1.2 in)
1972
82.0 mm (3.2 in)
1973
101.6 mm (4.0 in)
1974
41.9 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Clarksburg, 1935 to 1974. The record is 166 days in 1971, marked on the chart; the median year is 123 days.
Longest dry spell (CDD) at Clarksburg by year
Year
Longest dry spell (CDD)
1935
154 days
1936
42 days
1937
108 days
1938
148 days
1939
111 days
1940
145 days
1941
56 days
1942
105 days
1943
71 days
1944
118 days
1945
146 days
1946
128 days
1947
100 days
1948
129 days
1949
72 days
1950
136 days
1951
135 days
1952
137 days
1953
132 days
1954
108 days
1955
129 days
1956
110 days
1957
127 days
1959
144 days
1960
163 days
1961
137 days
1962
86 days
1963
123 days
1964
82 days
1965
81 days
1966
81 days
1967
111 days
1968
126 days
1969
136 days
1970
132 days
1971
166 days
1972
107 days
1973
84 days
1974
88 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
33 years with a frost
Across 33 years with a frost, the median last spring frost at Clarksburg falls on 28 February and the median first autumn frost on 18 November, which leaves a median of 265 days between them.
Fitted over all years, the growing season changes by +4.7 days per decade at this station.
Frost dates and growing season at Clarksburg
Measure
Median, all years
Earliest period
Recent period (1939 to 1972)
Recent against earliest
Fitted trend
Last spring frost
28 February
n/a
2 March
n/a
-0.5 days per decade
First autumn frost
18 November
n/a
19 November
n/a
+4.1 days per decade
Growing days
265 days
n/a
264 days
n/a
+4.7 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
35 years, 1936 to 1972
A day with at least 38.4 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 98.6 mm (3.9 in) of rain is expected about once in 100 years.
Rainfall return levels at Clarksburg: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
38.4 mm (1.5 in)
5 years
53.5 mm (2.1 in)
10 years
63.9 mm (2.5 in)
25 years
77.5 mm (3.1 in)
50 years
88.0 mm (3.5 in)
Longer than the 35 years of record
100 years
98.6 mm (3.9 in)
Longer than the 35 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, 35 years of values from 1936 to 1972.
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: 97.0 mm (3.8 in) in 1962; 70.1 mm (2.8 in) in 1970; 69.9 mm (2.8 in) in 1937.
Download the Data
Data for Clarksburg standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clarksburg 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.