Record envelope, standing records and threshold days for Maricopa (USC00045338), California, United States, with 83 years of record.
Key Facts for Maricopa
Maricopa (USC00045338) is a weather station in California, United States at 35.08 latitude and -119.38 longitude, 206 m (675 ft) above sea level.
The station reports from 1911 to 1993, 83 years of record.
1,464 records set at Maricopa still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Maricopa set a daily record high minimum temperature of 14.4 C (57.9 F) on 5 February 1993.
About the Station
Location: California, United States, 35.08 latitude, -119.38 longitude.
Elevation: 206 m (675 ft).
Period of record: 1911 to 1993, 83 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 Maricopa. 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 Maricopa, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
33.9 C (93.0 F)
-7.8 C (18.0 F)
n/a
n/a
Feb
33.9 C (93.0 F)
-5.6 C (21.9 F)
n/a
n/a
Mar
36.1 C (97.0 F)
-3.9 C (25.0 F)
n/a
n/a
Apr
38.9 C (102.0 F)
-1.1 C (30.0 F)
n/a
n/a
May
43.3 C (109.9 F)
1.1 C (34.0 F)
n/a
n/a
Jun
46.1 C (115.0 F)
5.0 C (41.0 F)
n/a
n/a
Jul
47.2 C (117.0 F)
8.9 C (48.0 F)
n/a
n/a
Aug
46.1 C (115.0 F)
8.9 C (48.0 F)
n/a
n/a
Sep
45.6 C (114.1 F)
5.0 C (41.0 F)
n/a
n/a
Oct
40.6 C (105.1 F)
-0.6 C (30.9 F)
n/a
n/a
Nov
34.4 C (93.9 F)
-5.6 C (21.9 F)
n/a
n/a
Dec
26.7 C (80.1 F)
-9.4 C (15.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Maricopa still stand. 1922 holds the most, with 52.
Standing records at Maricopa by the year they were set
Year set
Standing records
1911
25
1912
22
1913
23
1914
13
1915
24
1916
35
1917
48
1918
26
1919
17
1920
16
1921
14
1922
52
1923
19
1924
20
1925
27
1926
22
1927
9
1928
14
1929
32
1930
13
1931
34
1932
13
1933
24
1934
19
1935
19
1936
21
1937
5
1938
7
1939
7
1940
22
1941
13
1942
11
1943
17
1944
14
1945
19
1946
9
1947
19
1948
9
1949
25
1950
32
1951
7
1952
19
1953
15
1954
16
1955
11
1956
14
1957
11
1958
9
1959
23
1960
16
1961
21
1962
24
1963
20
1964
18
1965
13
1966
13
1967
16
1968
11
1969
3
1970
19
1971
26
1972
19
1973
16
1974
7
1975
13
1976
23
1977
29
1978
21
1979
5
1980
8
1981
12
1982
16
1983
6
1984
13
1985
24
1986
24
1987
20
1988
8
1989
20
1990
19
1991
21
1992
3
1993
2
All-Time Record Progression
5 new records
5 all-time records were set at Maricopa between 10 February 1962 and 6 December 1978. Each dot is a new record.
When Maricopa set new all-time records
Date
Kind
Detail
1962-02-10
Record daily precipitation
Record daily precipitation 62.5 mm (2.5 in)
1972-12-10
Record low maximum temperature
Record low maximum temperature 0.0 C (32.0 F)
1972-12-15
Record low maximum temperature
Record low maximum temperature -0.6 C (30.9 F)
1978-02-10
Record daily precipitation
Record daily precipitation 105.4 mm (4.1 in)
1978-12-06
Record low minimum temperature
Record low minimum temperature -9.4 C (15.1 F)
Wettest Day of Each Month
Feb: 105.4 mm (4.1 in)
The wettest day on record for each calendar month at Maricopa. The most was 105.4 mm (4.1 in) on 10 February 1978.
Record daily precipitation for each month at Maricopa
Month
Record daily precipitation (mm)
Date
Jan
46.0 mm (1.8 in)
18 January 1933
Feb
105.4 mm (4.1 in)
10 February 1978
Mar
41.9 mm (1.6 in)
19 March 1991
Apr
45.2 mm (1.8 in)
18 April 1926
May
27.4 mm (1.1 in)
8 May 1928
Jun
26.9 mm (1.1 in)
4 June 1933
Jul
4.1 mm (0.16 in)
20 July 1913
Aug
35.8 mm (1.4 in)
18 August 1983
Sep
33.5 mm (1.3 in)
7 September 1958
Oct
31.2 mm (1.2 in)
14 October 1968
Nov
57.4 mm (2.3 in)
4 November 1987
Dec
37.8 mm (1.5 in)
29 December 1965
Period of Record Coverage
1911 to 1993
Complete yearUnder 90 percent of days
83 years of record at Maricopa, 1911 to 1993. 12 years have data for under 90 percent of days and are left out of rankings: 1911, 1967, 1972, 1979, 1980, 1981, 1982, 1987 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 64 complete years at Maricopa, 1912 to 1990. Blue stripes are years cooler than the station's own mean of 18.6 C (65.5 F); red stripes are warmer. The coolest year was 1971, at 17.2 C (62.9 F), and the warmest was 1959, at 20.2 C (68.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Maricopa as warming stripes, 1912 to 1990
Year
Annual mean temperature
Difference from the station mean
1912
17.3 C
-1.33 C
1913
17.7 C
-0.87 C
1914
18.0 C
-0.59 C
1915
17.4 C
-1.25 C
1916
18.3 C
-0.35 C
1917
19.7 C
+1.05 C
1918
19.1 C
+0.44 C
1919
19.3 C
+0.73 C
1920
17.9 C
-0.74 C
1921
19.3 C
+0.68 C
1922
17.8 C
-0.78 C
1923
17.8 C
-0.81 C
1924
18.6 C
-0.01 C
1925
18.5 C
-0.14 C
1926
19.5 C
+0.87 C
1927
18.5 C
-0.11 C
1928
19.0 C
+0.35 C
1929
18.8 C
+0.18 C
1930
18.9 C
+0.33 C
1931
20.0 C
+1.38 C
1932
19.0 C
+0.43 C
1933
18.5 C
-0.15 C
1934
20.0 C
+1.42 C
1935
18.4 C
-0.18 C
1936
20.2 C
+1.57 C
1938
18.5 C
-0.13 C
1940
19.7 C
+1.07 C
1941
18.8 C
+0.14 C
1943
19.3 C
+0.73 C
1944
18.9 C
+0.29 C
1945
19.5 C
+0.88 C
1946
18.4 C
-0.19 C
1947
18.7 C
+0.13 C
1948
18.3 C
-0.29 C
1949
18.6 C
+0.03 C
1950
19.9 C
+1.30 C
1951
18.9 C
+0.30 C
1952
18.6 C
-0.01 C
1953
18.2 C
-0.42 C
1954
18.5 C
-0.08 C
1956
18.5 C
-0.09 C
1957
18.6 C
0.00 C
1958
19.6 C
+0.94 C
1959
20.2 C
+1.59 C
1960
19.1 C
+0.46 C
1961
18.7 C
+0.09 C
1962
18.7 C
+0.08 C
1963
18.1 C
-0.55 C
1964
18.2 C
-0.41 C
1966
18.7 C
+0.04 C
1968
18.3 C
-0.27 C
1969
18.1 C
-0.50 C
1970
18.5 C
-0.10 C
1971
17.2 C
-1.45 C
1973
18.0 C
-0.64 C
1974
18.2 C
-0.41 C
1975
17.2 C
-1.41 C
1976
17.6 C
-1.00 C
1977
17.5 C
-1.08 C
1978
17.8 C
-0.86 C
1983
17.7 C
-0.94 C
1984
18.4 C
-0.20 C
1986
19.5 C
+0.91 C
1990
18.8 C
+0.22 C
The fitted trend in annual mean temperature here over 1912 to 1990 is -0.05 C (-0.14 to 0.03) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.1) per decade. The slope is a straight line fitted to 64 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Maricopa
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.05 C (-0.14 to 0.03) per decade
-0.1 F (-0.3 to 0.1) per decade
1912 to 1990
64
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.3 to -0.1) per decade
-0.4 F (-0.6 to -0.2) per decade
1912 to 1990
64
Fall
Mean daily minimum
0.1 C (0.0 to 0.2) per decade
0.2 F (0.0 to 0.4) per decade
1912 to 1990
64
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
1911 to 1993
Yearly extremes at Maricopa: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.2 C (117.0 F)
1917
43.3 C (109.9 F)
83
Coldest night (TNn)
-9.4 C (15.1 F)
1978
-3.9 C (25.0 F)
83
Wettest day (Rx1day)
105.4 mm (4.1 in)
1978
24.1 mm (0.9 in)
83
Wettest five days (Rx5day)
129.0 mm (5.1 in)
1978
31.9 mm (1.3 in)
83
Longest dry spell (CDD)
233 days
1954
122 days
83
Hottest day (TXx)
The hottest day of the year at Maricopa, 1911 to 1993. The record is 47.2 C (117.0 F) in 1917, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at Maricopa by year
Year
Hottest day (TXx)
1911
35.6 C (96.1 F)
1912
41.7 C (107.1 F)
1913
43.9 C (111.0 F)
1914
42.8 C (109.0 F)
1915
43.9 C (111.0 F)
1916
46.7 C (116.1 F)
1917
47.2 C (117.0 F)
1918
43.3 C (109.9 F)
1919
42.8 C (109.0 F)
1920
45.6 C (114.1 F)
1921
43.9 C (111.0 F)
1922
44.4 C (111.9 F)
1923
44.4 C (111.9 F)
1924
43.9 C (111.0 F)
1925
45.0 C (113.0 F)
1926
45.0 C (113.0 F)
1927
42.2 C (108.0 F)
1928
43.3 C (109.9 F)
1929
44.4 C (111.9 F)
1930
45.6 C (114.1 F)
1931
46.7 C (116.1 F)
1932
43.9 C (111.0 F)
1933
46.7 C (116.1 F)
1934
44.4 C (111.9 F)
1935
43.9 C (111.0 F)
1936
45.0 C (113.0 F)
1937
43.9 C (111.0 F)
1938
43.9 C (111.0 F)
1939
42.8 C (109.0 F)
1940
43.3 C (109.9 F)
1941
43.3 C (109.9 F)
1942
45.6 C (114.1 F)
1943
42.8 C (109.0 F)
1944
42.2 C (108.0 F)
1945
43.3 C (109.9 F)
1946
42.8 C (109.0 F)
1947
43.3 C (109.9 F)
1948
43.9 C (111.0 F)
1949
43.3 C (109.9 F)
1950
46.7 C (116.1 F)
1951
43.3 C (109.9 F)
1952
41.1 C (106.0 F)
1953
42.2 C (108.0 F)
1954
43.3 C (109.9 F)
1955
45.0 C (113.0 F)
1956
43.3 C (109.9 F)
1957
43.3 C (109.9 F)
1958
43.3 C (109.9 F)
1959
44.4 C (111.9 F)
1960
44.4 C (111.9 F)
1961
46.1 C (115.0 F)
1962
41.1 C (106.0 F)
1963
42.8 C (109.0 F)
1964
43.9 C (111.0 F)
1965
41.7 C (107.1 F)
1966
42.8 C (109.0 F)
1967
42.8 C (109.0 F)
1968
41.7 C (107.1 F)
1969
40.6 C (105.1 F)
1970
42.8 C (109.0 F)
1971
42.2 C (108.0 F)
1972
45.0 C (113.0 F)
1973
42.2 C (108.0 F)
1974
41.7 C (107.1 F)
1975
42.8 C (109.0 F)
1976
44.4 C (111.9 F)
1977
41.1 C (106.0 F)
1978
41.7 C (107.1 F)
1979
40.0 C (104.0 F)
1980
42.8 C (109.0 F)
1981
41.7 C (107.1 F)
1982
38.9 C (102.0 F)
1983
41.1 C (106.0 F)
1984
45.6 C (114.1 F)
1985
45.0 C (113.0 F)
1986
44.4 C (111.9 F)
1987
43.3 C (109.9 F)
1988
42.8 C (109.0 F)
1989
42.2 C (108.0 F)
1990
42.2 C (108.0 F)
1991
45.6 C (114.1 F)
1992
40.6 C (105.1 F)
1993
40.6 C (105.1 F)
Coldest night (TNn)
The coldest night of the year at Maricopa, 1911 to 1993. The record is -9.4 C (15.1 F) in 1978, marked on the chart; the median year is -3.9 C (25.0 F).
Coldest night (TNn) at Maricopa by year
Year
Coldest night (TNn)
1911
-3.9 C (25.0 F)
1912
-4.4 C (24.1 F)
1913
-7.8 C (18.0 F)
1914
-2.8 C (27.0 F)
1915
-6.7 C (19.9 F)
1916
-5.6 C (21.9 F)
1917
-3.9 C (25.0 F)
1918
-3.3 C (26.1 F)
1919
-4.4 C (24.1 F)
1920
-1.1 C (30.0 F)
1921
-3.3 C (26.1 F)
1922
-5.6 C (21.9 F)
1923
-3.3 C (26.1 F)
1924
-5.6 C (21.9 F)
1925
-2.2 C (28.0 F)
1926
-6.1 C (21.0 F)
1927
-1.1 C (30.0 F)
1928
-6.1 C (21.0 F)
1929
-8.3 C (17.1 F)
1930
-7.8 C (18.0 F)
1931
-2.2 C (28.0 F)
1932
-5.6 C (21.9 F)
1933
-5.0 C (23.0 F)
1934
-2.8 C (27.0 F)
1935
-2.8 C (27.0 F)
1936
-1.7 C (28.9 F)
1937
-1.1 C (30.0 F)
1938
-3.3 C (26.1 F)
1939
-1.1 C (30.0 F)
1940
-2.8 C (27.0 F)
1941
-0.6 C (30.9 F)
1942
-3.3 C (26.1 F)
1943
-3.9 C (25.0 F)
1944
-1.1 C (30.0 F)
1945
-1.1 C (30.0 F)
1946
-1.7 C (28.9 F)
1947
-3.3 C (26.1 F)
1948
-3.9 C (25.0 F)
1949
-6.7 C (19.9 F)
1950
-6.7 C (19.9 F)
1951
-3.3 C (26.1 F)
1952
-6.1 C (21.0 F)
1953
-1.1 C (30.0 F)
1954
-3.3 C (26.1 F)
1955
-3.9 C (25.0 F)
1956
-3.9 C (25.0 F)
1957
-3.9 C (25.0 F)
1958
-1.7 C (28.9 F)
1959
0.0 C (32.0 F)
1960
-2.2 C (28.0 F)
1961
-7.8 C (18.0 F)
1962
-6.1 C (21.0 F)
1963
-7.2 C (19.0 F)
1964
-6.1 C (21.0 F)
1965
-5.0 C (23.0 F)
1966
-3.9 C (25.0 F)
1967
-5.0 C (23.0 F)
1968
-5.0 C (23.0 F)
1969
-2.8 C (27.0 F)
1970
-4.4 C (24.1 F)
1971
-3.9 C (25.0 F)
1972
-6.1 C (21.0 F)
1973
-2.8 C (27.0 F)
1974
-6.7 C (19.9 F)
1975
-3.3 C (26.1 F)
1976
-3.9 C (25.0 F)
1977
-3.9 C (25.0 F)
1978
-9.4 C (15.1 F)
1979
-3.3 C (26.1 F)
1980
-1.7 C (28.9 F)
1981
-1.1 C (30.0 F)
1982
-3.3 C (26.1 F)
1983
-3.3 C (26.1 F)
1984
-8.9 C (16.0 F)
1985
-6.1 C (21.0 F)
1986
-0.6 C (30.9 F)
1987
-4.4 C (24.1 F)
1988
-3.3 C (26.1 F)
1989
-5.0 C (23.0 F)
1990
-7.8 C (18.0 F)
1991
-1.7 C (28.9 F)
1992
-2.2 C (28.0 F)
1993
-2.8 C (27.0 F)
Wettest day (Rx1day)
The wettest day of the year at Maricopa, 1911 to 1993. The record is 105.4 mm (4.1 in) in 1978, marked on the chart; the median year is 24.1 mm (0.9 in).
Wettest day (Rx1day) at Maricopa by year
Year
Wettest day (Rx1day)
1911
5.3 mm (0.21 in)
1912
30.5 mm (1.2 in)
1913
54.9 mm (2.2 in)
1914
19.1 mm (0.8 in)
1915
33.3 mm (1.3 in)
1916
26.4 mm (1.0 in)
1917
15.5 mm (0.6 in)
1918
33.0 mm (1.3 in)
1919
12.7 mm (0.5 in)
1920
15.2 mm (0.6 in)
1921
19.1 mm (0.8 in)
1922
25.1 mm (1.0 in)
1923
12.2 mm (0.5 in)
1924
16.0 mm (0.6 in)
1925
14.0 mm (0.6 in)
1926
45.2 mm (1.8 in)
1927
19.6 mm (0.8 in)
1928
27.4 mm (1.1 in)
1929
7.6 mm (0.30 in)
1930
15.7 mm (0.6 in)
1931
22.9 mm (0.9 in)
1932
22.9 mm (0.9 in)
1933
46.0 mm (1.8 in)
1934
27.9 mm (1.1 in)
1935
29.0 mm (1.1 in)
1936
25.4 mm (1.0 in)
1937
11.2 mm (0.4 in)
1938
39.9 mm (1.6 in)
1939
15.5 mm (0.6 in)
1940
24.1 mm (0.9 in)
1941
27.7 mm (1.1 in)
1942
12.7 mm (0.5 in)
1943
34.3 mm (1.4 in)
1944
25.7 mm (1.0 in)
1945
15.7 mm (0.6 in)
1946
18.8 mm (0.7 in)
1947
18.0 mm (0.7 in)
1948
11.7 mm (0.5 in)
1949
8.9 mm (0.35 in)
1950
10.4 mm (0.4 in)
1951
16.5 mm (0.6 in)
1952
23.6 mm (0.9 in)
1953
24.4 mm (1.0 in)
1954
35.1 mm (1.4 in)
1955
19.3 mm (0.8 in)
1956
25.4 mm (1.0 in)
1957
32.3 mm (1.3 in)
1958
33.5 mm (1.3 in)
1959
27.7 mm (1.1 in)
1960
29.2 mm (1.1 in)
1961
12.4 mm (0.5 in)
1962
62.5 mm (2.5 in)
1963
24.4 mm (1.0 in)
1964
14.7 mm (0.6 in)
1965
37.8 mm (1.5 in)
1966
34.5 mm (1.4 in)
1967
14.5 mm (0.6 in)
1968
31.2 mm (1.2 in)
1969
36.1 mm (1.4 in)
1970
20.3 mm (0.8 in)
1971
24.1 mm (0.9 in)
1972
6.4 mm (0.25 in)
1973
16.0 mm (0.6 in)
1974
29.2 mm (1.1 in)
1975
20.3 mm (0.8 in)
1976
30.7 mm (1.2 in)
1977
36.3 mm (1.4 in)
1978
105.4 mm (4.1 in)
1979
43.2 mm (1.7 in)
1980
33.0 mm (1.3 in)
1981
14.0 mm (0.6 in)
1982
30.5 mm (1.2 in)
1983
35.8 mm (1.4 in)
1984
18.5 mm (0.7 in)
1985
33.0 mm (1.3 in)
1986
17.8 mm (0.7 in)
1987
57.4 mm (2.3 in)
1988
16.5 mm (0.6 in)
1989
17.8 mm (0.7 in)
1990
10.2 mm (0.4 in)
1991
41.9 mm (1.6 in)
1992
19.8 mm (0.8 in)
1993
0.0 mm (0.00 in)
Wettest five days (Rx5day)
The wettest five days of the year at Maricopa, 1911 to 1993. The record is 129.0 mm (5.1 in) in 1978, marked on the chart; the median year is 31.9 mm (1.3 in).
Wettest five days (Rx5day) at Maricopa by year
Year
Wettest five days (Rx5day)
1911
9.1 mm (0.36 in)
1912
41.7 mm (1.6 in)
1913
74.5 mm (2.9 in)
1914
31.9 mm (1.3 in)
1915
42.2 mm (1.7 in)
1916
31.2 mm (1.2 in)
1917
28.2 mm (1.1 in)
1918
64.3 mm (2.5 in)
1919
14.0 mm (0.6 in)
1920
28.4 mm (1.1 in)
1921
40.9 mm (1.6 in)
1922
25.1 mm (1.0 in)
1923
12.2 mm (0.5 in)
1924
21.3 mm (0.8 in)
1925
16.8 mm (0.7 in)
1926
51.6 mm (2.0 in)
1927
20.1 mm (0.8 in)
1928
27.4 mm (1.1 in)
1929
8.4 mm (0.33 in)
1930
22.1 mm (0.9 in)
1931
25.2 mm (1.0 in)
1932
32.9 mm (1.3 in)
1933
70.2 mm (2.8 in)
1934
34.8 mm (1.4 in)
1935
35.4 mm (1.4 in)
1936
41.2 mm (1.6 in)
1937
12.5 mm (0.5 in)
1938
53.4 mm (2.1 in)
1939
20.8 mm (0.8 in)
1940
29.7 mm (1.2 in)
1941
41.2 mm (1.6 in)
1942
29.7 mm (1.2 in)
1943
65.0 mm (2.6 in)
1944
33.3 mm (1.3 in)
1945
30.0 mm (1.2 in)
1946
34.8 mm (1.4 in)
1947
18.0 mm (0.7 in)
1948
21.9 mm (0.9 in)
1949
10.5 mm (0.4 in)
1950
15.0 mm (0.6 in)
1951
24.6 mm (1.0 in)
1952
38.6 mm (1.5 in)
1953
25.2 mm (1.0 in)
1954
49.3 mm (1.9 in)
1955
29.7 mm (1.2 in)
1956
29.7 mm (1.2 in)
1957
32.3 mm (1.3 in)
1958
39.4 mm (1.6 in)
1959
29.0 mm (1.1 in)
1960
53.6 mm (2.1 in)
1961
13.2 mm (0.5 in)
1962
115.1 mm (4.5 in)
1963
25.7 mm (1.0 in)
1964
23.6 mm (0.9 in)
1965
42.0 mm (1.7 in)
1966
37.8 mm (1.5 in)
1967
43.0 mm (1.7 in)
1968
31.2 mm (1.2 in)
1969
44.8 mm (1.8 in)
1970
33.8 mm (1.3 in)
1971
28.8 mm (1.1 in)
1972
13.8 mm (0.5 in)
1973
27.2 mm (1.1 in)
1974
36.1 mm (1.4 in)
1975
32.1 mm (1.3 in)
1976
44.7 mm (1.8 in)
1977
40.6 mm (1.6 in)
1978
129.0 mm (5.1 in)
1979
79.8 mm (3.1 in)
1980
35.9 mm (1.4 in)
1981
14.0 mm (0.6 in)
1982
53.6 mm (2.1 in)
1983
38.9 mm (1.5 in)
1984
20.4 mm (0.8 in)
1985
33.8 mm (1.3 in)
1986
29.0 mm (1.1 in)
1987
83.1 mm (3.3 in)
1988
47.3 mm (1.9 in)
1989
23.6 mm (0.9 in)
1990
10.2 mm (0.4 in)
1991
75.2 mm (3.0 in)
1992
32.8 mm (1.3 in)
1993
0.0 mm (0.00 in)
Longest dry spell (CDD)
The longest dry spell of the year at Maricopa, 1911 to 1993. The record is 233 days in 1954, marked on the chart; the median year is 122 days.
Longest dry spell (CDD) at Maricopa by year
Year
Longest dry spell (CDD)
1911
65 days
1912
119 days
1913
73 days
1914
146 days
1915
58 days
1916
35 days
1917
31 days
1918
31 days
1919
41 days
1920
24 days
1921
22 days
1922
17 days
1923
23 days
1924
26 days
1925
31 days
1926
53 days
1927
171 days
1928
187 days
1929
198 days
1930
139 days
1931
118 days
1932
118 days
1933
118 days
1934
135 days
1935
189 days
1936
114 days
1937
157 days
1938
121 days
1939
123 days
1940
37 days
1941
173 days
1942
100 days
1943
167 days
1944
157 days
1945
132 days
1946
86 days
1947
157 days
1948
102 days
1949
93 days
1950
53 days
1951
177 days
1952
200 days
1953
113 days
1954
233 days
1955
190 days
1956
147 days
1957
122 days
1958
118 days
1959
231 days
1960
160 days
1961
210 days
1962
209 days
1963
98 days
1964
115 days
1965
128 days
1966
210 days
1967
94 days
1968
193 days
1969
164 days
1970
212 days
1971
124 days
1972
140 days
1973
195 days
1974
174 days
1975
115 days
1976
87 days
1977
79 days
1978
125 days
1979
60 days
1980
99 days
1981
126 days
1982
53 days
1983
106 days
1984
58 days
1985
98 days
1986
191 days
1987
136 days
1988
141 days
1989
130 days
1990
156 days
1991
188 days
1992
175 days
1993
33 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
58 years with a frost
Across 58 years with a frost, the median last spring frost at Maricopa falls on 10 February and the median first autumn frost on 9 December, which leaves a median of 305 days between them.
Fitted over all years, the growing season changes by +1.7 days per decade at this station.
Frost dates and growing season at Maricopa
Measure
Median, all years
Earliest period
Recent period (1946 to 1990)
Recent against earliest
Fitted trend
Last spring frost
10 February
n/a
7 February
n/a
-1.3 days per decade
First autumn frost
9 December
n/a
9 December
n/a
+0.4 days per decade
Growing days
305 days
n/a
306 days
n/a
+1.7 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
60 years, 1912 to 1991
A day with at least 23.4 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 77.0 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Maricopa: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
23.4 mm (0.9 in)
5 years
35.1 mm (1.4 in)
10 years
43.8 mm (1.7 in)
25 years
56.1 mm (2.2 in)
50 years
66.1 mm (2.6 in)
100 years
77.0 mm (3.0 in)
Longer than the 60 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, 60 years of values from 1912 to 1991.
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: 105.4 mm (4.1 in) in 1978; 62.5 mm (2.5 in) in 1962; 54.9 mm (2.2 in) in 1913.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Maricopa, at 1966. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1966 ran 0.6 C (1.0 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Maricopa, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1966
-0.6
-1.0
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 Maricopa standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Maricopa 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.