Record envelope, standing records and threshold days for Maricopa 9 SSW (USC00025274), Arizona, United States, with 61 years of record.
Key Facts for Maricopa 9 SSW
Maricopa 9 SSW (USC00025274) is a weather station in Arizona, United States at 32.92 latitude and -112.10 longitude, 427 m (1,401 ft) above sea level.
The station reports from 1898 to 1958, 61 years of record.
1,464 records set at Maricopa 9 SSW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Maricopa 9 SSW tied a daily record high maximum temperature of 27.8 C (82.0 F) on 4 December 1958.
About the Station
Location: Arizona, United States, 32.92 latitude, -112.10 longitude.
Elevation: 427 m (1,401 ft).
Period of record: 1898 to 1958, 61 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 9 SSW. 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 9 SSW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
32.8 C (91.0 F)
-13.3 C (8.1 F)
n/a
n/a
Feb
32.2 C (90.0 F)
-8.9 C (16.0 F)
n/a
n/a
Mar
36.7 C (98.1 F)
-4.4 C (24.1 F)
n/a
n/a
Apr
40.0 C (104.0 F)
-1.1 C (30.0 F)
n/a
n/a
May
45.6 C (114.1 F)
2.2 C (36.0 F)
n/a
n/a
Jun
48.9 C (120.0 F)
3.9 C (39.0 F)
n/a
n/a
Jul
50.0 C (122.0 F)
8.9 C (48.0 F)
n/a
n/a
Aug
48.3 C (118.9 F)
10.6 C (51.1 F)
n/a
n/a
Sep
48.9 C (120.0 F)
4.4 C (39.9 F)
n/a
n/a
Oct
43.3 C (109.9 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
37.2 C (99.0 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
31.1 C (88.0 F)
-8.3 C (17.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Maricopa 9 SSW still stand. 1922 holds the most, with 56.
Standing records at Maricopa 9 SSW by the year they were set
Year set
Standing records
1902
2
1903
31
1904
20
1905
42
1906
29
1907
45
1908
50
1911
11
1912
43
1913
38
1914
28
1915
35
1916
32
1917
22
1918
33
1919
22
1920
32
1921
38
1922
56
1923
40
1924
31
1925
46
1926
22
1927
38
1928
25
1929
24
1930
37
1931
31
1932
25
1933
32
1934
36
1935
24
1936
38
1937
23
1938
31
1939
26
1940
16
1941
12
1942
20
1943
14
1944
9
1945
16
1946
20
1947
19
1948
36
1949
42
1950
46
1951
15
1952
7
1953
4
1955
17
1956
11
1957
7
1958
15
All-Time Record Progression
2 new records
2 all-time records were set at Maricopa 9 SSW between 21 January 1937 and 21 January 1937. Each dot is a new record.
When Maricopa 9 SSW set new all-time records
Date
Kind
Detail
1937-01-21
Record daily snowfall
Record daily snowfall 7.6 cm (3.0 in)
1937-01-21
Record snow depth
Record snow depth 7.6 cm (3.0 in)
Wettest Day of Each Month
Jul: 85.1 mm (3.4 in)
The wettest day on record for each calendar month at Maricopa 9 SSW. The most was 85.1 mm (3.4 in) on 29 July 1917.
Record daily precipitation for each month at Maricopa 9 SSW
Month
Record daily precipitation (mm)
Date
Jan
43.2 mm (1.7 in)
30 January 1951
Feb
31.2 mm (1.2 in)
11 February 1927
Mar
33.0 mm (1.3 in)
28 March 1926
Apr
30.5 mm (1.2 in)
12 April 1941
May
18.3 mm (0.7 in)
1 May 1941
Jun
22.1 mm (0.9 in)
24 June 1899
Jul
85.1 mm (3.4 in)
29 July 1917
Aug
71.1 mm (2.8 in)
1 August 1919
Sep
79.2 mm (3.1 in)
7 September 1926
Oct
38.1 mm (1.5 in)
3 October 1914
Nov
39.4 mm (1.6 in)
29 November 1921
Dec
45.7 mm (1.8 in)
31 December 1915
Period of Record Coverage
1902 to 1958
Complete yearUnder 90 percent of days
54 years of record at Maricopa 9 SSW, 1902 to 1958. 17 years have data for under 90 percent of days and are left out of rankings: 1902, 1908, 1911, 1914, 1934, 1939, 1940, 1942 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 28 complete years at Maricopa 9 SSW, 1903 to 1950. Blue stripes are years cooler than the station's own mean of 20.5 C (68.8 F); red stripes are warmer. The coolest year was 1941, at 19.5 C (67.0 F), and the warmest was 1925, at 21.1 C (70.0 F). The strongest colour marks a difference of 1.0 C (1.8 F).
Annual mean temperature at Maricopa 9 SSW as warming stripes, 1903 to 1950
Year
Annual mean temperature
Difference from the station mean
1903
20.2 C
-0.26 C
1904
20.5 C
-0.01 C
1905
21.0 C
+0.56 C
1906
21.0 C
+0.55 C
1907
20.8 C
+0.34 C
1912
20.4 C
-0.07 C
1913
20.2 C
-0.30 C
1915
20.7 C
+0.22 C
1916
20.9 C
+0.47 C
1917
21.0 C
+0.55 C
1919
20.3 C
-0.21 C
1920
19.8 C
-0.69 C
1921
20.6 C
+0.13 C
1922
20.1 C
-0.37 C
1923
20.2 C
-0.25 C
1925
21.1 C
+0.65 C
1928
21.0 C
+0.49 C
1929
20.1 C
-0.42 C
1932
20.4 C
-0.12 C
1933
20.6 C
+0.11 C
1935
20.5 C
+0.05 C
1937
21.1 C
+0.60 C
1938
21.1 C
+0.64 C
1941
19.5 C
-1.00 C
1945
20.3 C
-0.18 C
1948
19.7 C
-0.77 C
1949
19.7 C
-0.81 C
1950
20.5 C
+0.01 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
1898 to 1958
Yearly extremes at Maricopa 9 SSW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
50.0 C (122.0 F)
1905
46.7 C (116.1 F)
54
Coldest night (TNn)
-13.3 C (8.1 F)
1913
-6.7 C (19.9 F)
54
Wettest day (Rx1day)
85.1 mm (3.4 in)
1917
29.1 mm (1.1 in)
58
Wettest five days (Rx5day)
106.7 mm (4.2 in)
1946
43.7 mm (1.7 in)
58
Longest dry spell (CDD)
159 days
1901
76 days
58
Hottest day (TXx)
The hottest day of the year at Maricopa 9 SSW, 1898 to 1958. The record is 50.0 C (122.0 F) in 1905, marked on the chart; the median year is 46.7 C (116.1 F).
Hottest day (TXx) at Maricopa 9 SSW by year
Year
Hottest day (TXx)
1898
n/a
1899
n/a
1900
n/a
1901
n/a
1902
22.8 C (73.0 F)
1903
45.0 C (113.0 F)
1904
45.0 C (113.0 F)
1905
50.0 C (122.0 F)
1906
46.1 C (115.0 F)
1907
50.0 C (122.0 F)
1908
46.1 C (115.0 F)
1911
45.6 C (114.1 F)
1912
47.8 C (118.0 F)
1913
46.7 C (116.1 F)
1914
46.7 C (116.1 F)
1915
47.2 C (117.0 F)
1916
47.2 C (117.0 F)
1917
46.7 C (116.1 F)
1918
47.8 C (118.0 F)
1919
46.7 C (116.1 F)
1920
46.7 C (116.1 F)
1921
46.7 C (116.1 F)
1922
48.3 C (118.9 F)
1923
46.1 C (115.0 F)
1924
47.8 C (118.0 F)
1925
48.9 C (120.0 F)
1926
48.9 C (120.0 F)
1927
46.7 C (116.1 F)
1928
46.1 C (115.0 F)
1929
48.3 C (118.9 F)
1930
48.3 C (118.9 F)
1931
46.1 C (115.0 F)
1932
46.1 C (115.0 F)
1933
47.8 C (118.0 F)
1934
48.3 C (118.9 F)
1935
46.1 C (115.0 F)
1936
47.8 C (118.0 F)
1937
48.3 C (118.9 F)
1938
47.2 C (117.0 F)
1939
48.9 C (120.0 F)
1940
46.1 C (115.0 F)
1941
44.4 C (111.9 F)
1942
47.2 C (117.0 F)
1943
46.1 C (115.0 F)
1944
37.2 C (99.0 F)
1945
45.6 C (114.1 F)
1946
46.7 C (116.1 F)
1947
47.2 C (117.0 F)
1948
45.6 C (114.1 F)
1949
45.6 C (114.1 F)
1950
48.9 C (120.0 F)
1951
45.0 C (113.0 F)
1952
46.1 C (115.0 F)
1953
35.0 C (95.0 F)
1955
45.0 C (113.0 F)
1956
42.2 C (108.0 F)
1957
44.4 C (111.9 F)
1958
45.0 C (113.0 F)
Coldest night (TNn)
The coldest night of the year at Maricopa 9 SSW, 1898 to 1958. The record is -13.3 C (8.1 F) in 1913, marked on the chart; the median year is -6.7 C (19.9 F).
Coldest night (TNn) at Maricopa 9 SSW by year
Year
Coldest night (TNn)
1898
n/a
1899
n/a
1900
n/a
1901
n/a
1902
-2.8 C (27.0 F)
1903
-5.0 C (23.0 F)
1904
-8.3 C (17.1 F)
1905
-5.6 C (21.9 F)
1906
-5.6 C (21.9 F)
1907
-5.0 C (23.0 F)
1908
-3.3 C (26.1 F)
1911
-7.2 C (19.0 F)
1912
-6.7 C (19.9 F)
1913
-13.3 C (8.1 F)
1914
-4.4 C (24.1 F)
1915
-6.7 C (19.9 F)
1916
-7.8 C (18.0 F)
1917
-5.6 C (21.9 F)
1918
-5.6 C (21.9 F)
1919
-6.1 C (21.0 F)
1920
-5.6 C (21.9 F)
1921
-6.7 C (19.9 F)
1922
-6.7 C (19.9 F)
1923
-5.6 C (21.9 F)
1924
-5.0 C (23.0 F)
1925
-7.2 C (19.0 F)
1926
-4.4 C (24.1 F)
1927
-3.3 C (26.1 F)
1928
-6.1 C (21.0 F)
1929
-6.7 C (19.9 F)
1930
-7.2 C (19.0 F)
1931
-7.2 C (19.0 F)
1932
-7.8 C (18.0 F)
1933
-6.7 C (19.9 F)
1934
-7.8 C (18.0 F)
1935
-5.6 C (21.9 F)
1936
-6.7 C (19.9 F)
1937
-10.6 C (12.9 F)
1938
-7.2 C (19.0 F)
1939
-8.3 C (17.1 F)
1940
-3.3 C (26.1 F)
1941
-5.6 C (21.9 F)
1942
-5.6 C (21.9 F)
1943
-7.2 C (19.0 F)
1944
-6.7 C (19.9 F)
1945
-7.8 C (18.0 F)
1946
-7.8 C (18.0 F)
1947
-7.2 C (19.0 F)
1948
-11.1 C (12.0 F)
1949
-11.7 C (10.9 F)
1950
-13.3 C (8.1 F)
1951
-7.2 C (19.0 F)
1952
-7.2 C (19.0 F)
1953
-6.1 C (21.0 F)
1955
-2.2 C (28.0 F)
1956
-5.6 C (21.9 F)
1957
-2.8 C (27.0 F)
1958
-5.6 C (21.9 F)
Wettest day (Rx1day)
The wettest day of the year at Maricopa 9 SSW, 1898 to 1958. The record is 85.1 mm (3.4 in) in 1917, marked on the chart; the median year is 29.1 mm (1.1 in).
Wettest day (Rx1day) at Maricopa 9 SSW by year
Year
Wettest day (Rx1day)
1898
39.6 mm (1.6 in)
1899
22.1 mm (0.9 in)
1900
6.4 mm (0.25 in)
1901
38.1 mm (1.5 in)
1902
27.9 mm (1.1 in)
1903
39.4 mm (1.6 in)
1904
17.8 mm (0.7 in)
1905
22.9 mm (0.9 in)
1906
38.1 mm (1.5 in)
1907
16.5 mm (0.6 in)
1908
29.0 mm (1.1 in)
1911
74.7 mm (2.9 in)
1912
27.9 mm (1.1 in)
1913
15.2 mm (0.6 in)
1914
38.1 mm (1.5 in)
1915
45.7 mm (1.8 in)
1916
82.6 mm (3.3 in)
1917
85.1 mm (3.4 in)
1918
25.4 mm (1.0 in)
1919
71.1 mm (2.8 in)
1920
27.7 mm (1.1 in)
1921
39.4 mm (1.6 in)
1922
55.9 mm (2.2 in)
1923
27.9 mm (1.1 in)
1924
15.5 mm (0.6 in)
1925
61.0 mm (2.4 in)
1926
79.2 mm (3.1 in)
1927
31.2 mm (1.2 in)
1928
20.3 mm (0.8 in)
1929
38.1 mm (1.5 in)
1930
31.2 mm (1.2 in)
1931
24.9 mm (1.0 in)
1932
19.8 mm (0.8 in)
1933
31.8 mm (1.3 in)
1934
25.4 mm (1.0 in)
1935
29.7 mm (1.2 in)
1936
35.6 mm (1.4 in)
1937
29.2 mm (1.1 in)
1938
17.8 mm (0.7 in)
1939
20.3 mm (0.8 in)
1940
30.5 mm (1.2 in)
1941
30.5 mm (1.2 in)
1942
20.1 mm (0.8 in)
1943
34.8 mm (1.4 in)
1944
13.2 mm (0.5 in)
1945
13.2 mm (0.5 in)
1946
68.3 mm (2.7 in)
1947
17.0 mm (0.7 in)
1948
22.6 mm (0.9 in)
1949
20.3 mm (0.8 in)
1950
30.5 mm (1.2 in)
1951
56.1 mm (2.2 in)
1952
17.8 mm (0.7 in)
1953
1.5 mm (0.06 in)
1955
50.8 mm (2.0 in)
1956
16.5 mm (0.6 in)
1957
32.3 mm (1.3 in)
1958
8.9 mm (0.35 in)
Wettest five days (Rx5day)
The wettest five days of the year at Maricopa 9 SSW, 1898 to 1958. The record is 106.7 mm (4.2 in) in 1946, marked on the chart; the median year is 43.7 mm (1.7 in).
Wettest five days (Rx5day) at Maricopa 9 SSW by year
Year
Wettest five days (Rx5day)
1898
53.9 mm (2.1 in)
1899
43.9 mm (1.7 in)
1900
6.4 mm (0.25 in)
1901
41.9 mm (1.6 in)
1902
27.9 mm (1.1 in)
1903
66.6 mm (2.6 in)
1904
22.9 mm (0.9 in)
1905
46.2 mm (1.8 in)
1906
40.4 mm (1.6 in)
1907
40.4 mm (1.6 in)
1908
58.4 mm (2.3 in)
1911
90.2 mm (3.6 in)
1912
37.3 mm (1.5 in)
1913
24.9 mm (1.0 in)
1914
74.4 mm (2.9 in)
1915
48.7 mm (1.9 in)
1916
105.5 mm (4.2 in)
1917
90.2 mm (3.6 in)
1918
44.0 mm (1.7 in)
1919
71.1 mm (2.8 in)
1920
32.8 mm (1.3 in)
1921
43.5 mm (1.7 in)
1922
55.9 mm (2.2 in)
1923
35.5 mm (1.4 in)
1924
19.3 mm (0.8 in)
1925
74.7 mm (2.9 in)
1926
79.2 mm (3.1 in)
1927
53.9 mm (2.1 in)
1928
20.3 mm (0.8 in)
1929
55.9 mm (2.2 in)
1930
62.6 mm (2.5 in)
1931
62.8 mm (2.5 in)
1932
33.5 mm (1.3 in)
1933
41.5 mm (1.6 in)
1934
25.4 mm (1.0 in)
1935
52.3 mm (2.1 in)
1936
59.3 mm (2.3 in)
1937
56.7 mm (2.2 in)
1938
28.4 mm (1.1 in)
1939
32.0 mm (1.3 in)
1940
45.7 mm (1.8 in)
1941
55.6 mm (2.2 in)
1942
26.7 mm (1.1 in)
1943
53.9 mm (2.1 in)
1944
30.2 mm (1.2 in)
1945
19.5 mm (0.8 in)
1946
106.7 mm (4.2 in)
1947
17.0 mm (0.7 in)
1948
22.6 mm (0.9 in)
1949
26.9 mm (1.1 in)
1950
40.7 mm (1.6 in)
1951
61.2 mm (2.4 in)
1952
33.0 mm (1.3 in)
1953
1.5 mm (0.06 in)
1955
63.2 mm (2.5 in)
1956
16.5 mm (0.6 in)
1957
47.5 mm (1.9 in)
1958
13.2 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Maricopa 9 SSW, 1898 to 1958. The record is 159 days in 1901, marked on the chart; the median year is 76 days.
Longest dry spell (CDD) at Maricopa 9 SSW by year
Year
Longest dry spell (CDD)
1898
89 days
1899
119 days
1900
119 days
1901
159 days
1902
119 days
1903
69 days
1904
112 days
1905
76 days
1906
87 days
1907
56 days
1908
43 days
1911
50 days
1912
65 days
1913
86 days
1914
38 days
1915
70 days
1916
86 days
1917
76 days
1918
86 days
1919
62 days
1920
62 days
1921
63 days
1922
83 days
1923
58 days
1924
89 days
1925
66 days
1926
61 days
1927
53 days
1928
148 days
1929
103 days
1930
41 days
1931
89 days
1932
51 days
1933
99 days
1934
54 days
1935
78 days
1936
92 days
1937
111 days
1938
107 days
1939
78 days
1940
53 days
1941
75 days
1942
117 days
1943
73 days
1944
30 days
1945
124 days
1946
87 days
1947
83 days
1948
79 days
1949
76 days
1950
130 days
1951
72 days
1952
25 days
1953
30 days
1955
58 days
1956
30 days
1957
31 days
1958
65 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
28 years with a frost
Across 28 years with a frost, the median last spring frost at Maricopa 9 SSW falls on 19 March and the median first autumn frost on 14 November, which leaves a median of 250 days between them.
Fitted over all years, the growing season changes by -5.3 days per decade at this station.
Frost dates and growing season at Maricopa 9 SSW
Measure
Median, all years
Earliest period
Recent period (1903 to 1950)
Recent against earliest
Fitted trend
Last spring frost
19 March
n/a
19 March
n/a
+1.3 days per decade
First autumn frost
14 November
n/a
14 November
n/a
-3.9 days per decade
Growing days
250 days
n/a
250 days
n/a
-5.3 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
43 years, 1899 to 1951
A day with at least 29.3 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 113.3 mm (4.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Maricopa 9 SSW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
29.3 mm (1.2 in)
5 years
45.8 mm (1.8 in)
10 years
58.8 mm (2.3 in)
25 years
78.0 mm (3.1 in)
50 years
94.6 mm (3.7 in)
Longer than the 43 years of record
100 years
113.3 mm (4.5 in)
Longer than the 43 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, 43 years of values from 1899 to 1951.
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: 85.1 mm (3.4 in) in 1917; 82.6 mm (3.3 in) in 1916; 79.2 mm (3.1 in) in 1926.
Download the Data
Data for Maricopa 9 SSW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Maricopa 9 SSW 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.