Record envelope, standing records and threshold days for Maricopa 4 N (USC00025270), Arizona, United States, with 54 years of record.
Key Facts for Maricopa 4 N
Maricopa 4 N (USC00025270) is a weather station in Arizona, United States at 33.11 latitude and -112.03 longitude, 354 m (1,160 ft) above sea level.
The station reports from 1960 to 2013, 54 years of record.
1,464 records set at Maricopa 4 N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Maricopa 4 N tied a daily record high minimum temperature of 26.1 C (79.0 F) on 17 September 2013.
About the Station
Location: Arizona, United States, 33.11 latitude, -112.03 longitude.
Elevation: 354 m (1,160 ft).
Period of record: 1960 to 2013, 54 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 4 N. 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 4 N, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
30.0 C (86.0 F)
-10.6 C (12.9 F)
n/a
n/a
Feb
32.2 C (90.0 F)
-10.0 C (14.0 F)
n/a
n/a
Mar
37.8 C (100.0 F)
-6.1 C (21.0 F)
n/a
n/a
Apr
41.1 C (106.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
45.0 C (113.0 F)
0.6 C (33.1 F)
n/a
n/a
Jun
50.0 C (122.0 F)
6.1 C (43.0 F)
n/a
n/a
Jul
51.1 C (124.0 F)
13.9 C (57.0 F)
n/a
n/a
Aug
47.2 C (117.0 F)
12.2 C (54.0 F)
n/a
n/a
Sep
45.6 C (114.1 F)
6.1 C (43.0 F)
n/a
n/a
Oct
42.8 C (109.0 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
35.0 C (95.0 F)
-8.9 C (16.0 F)
n/a
n/a
Dec
28.9 C (84.0 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 4 N still stand. 1971 holds the most, with 59.
Standing records at Maricopa 4 N by the year they were set
Year set
Standing records
1960
24
1961
27
1962
42
1963
23
1964
57
1965
53
1966
23
1967
20
1968
38
1969
24
1970
31
1971
59
1972
42
1973
36
1974
25
1975
33
1976
25
1977
31
1978
23
1979
37
1980
34
1981
15
1982
21
1983
25
1984
13
1985
23
1986
31
1987
26
1988
18
1989
35
1990
32
1991
23
1992
20
1993
23
1994
19
1995
29
1996
36
1997
22
1998
23
1999
28
2000
30
2001
28
2002
14
2003
31
2004
12
2005
16
2006
15
2007
23
2008
19
2009
29
2010
18
2011
29
2012
20
2013
11
All-Time Record Progression
2 new records
2 all-time records were set at Maricopa 4 N between 26 June 1990 and 28 July 1995. Each dot is a new record.
When Maricopa 4 N set new all-time records
Date
Kind
Detail
1990-06-26
Record high maximum temperature
Record high maximum temperature 50.0 C (122.0 F)
1995-07-28
Record high maximum temperature
Record high maximum temperature 51.1 C (124.0 F)
Wettest Day of Each Month
Jun: 61.5 mm (2.4 in)
The wettest day on record for each calendar month at Maricopa 4 N. The most was 61.5 mm (2.4 in) on 18 June 1967.
Record daily precipitation for each month at Maricopa 4 N
Month
Record daily precipitation (mm)
Date
Jan
28.7 mm (1.1 in)
5 January 1995
Feb
47.5 mm (1.9 in)
6 February 1965
Mar
49.8 mm (2.0 in)
11 March 2006
Apr
23.9 mm (0.9 in)
6 April 2001
May
32.8 mm (1.3 in)
23 May 2008
Jun
61.5 mm (2.4 in)
18 June 1967
Jul
36.3 mm (1.4 in)
18 July 1984
Aug
48.3 mm (1.9 in)
18 August 1969
Sep
35.3 mm (1.4 in)
12 September 1966
Oct
44.7 mm (1.8 in)
19 October 1972
Nov
45.7 mm (1.8 in)
15 November 1968
Dec
37.8 mm (1.5 in)
15 December 1967
Period of Record Coverage
1960 to 2013
Complete yearUnder 90 percent of days
54 years of record at Maricopa 4 N, 1960 to 2013. 2 years have data for under 90 percent of days and are left out of rankings: 1960, 2013.
Cooler than the station meanWarmer than the station mean
One stripe for each of 51 complete years at Maricopa 4 N, 1961 to 2012. Blue stripes are years cooler than the station's own mean of 21.1 C (70.0 F); red stripes are warmer. The coolest year was 1964, at 19.5 C (67.1 F), and the warmest was 2012, at 22.5 C (72.5 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Maricopa 4 N as warming stripes, 1961 to 2012
Year
Annual mean temperature
Difference from the station mean
1961
20.3 C
-0.81 C
1962
21.0 C
-0.13 C
1963
20.9 C
-0.21 C
1964
19.5 C
-1.63 C
1965
20.0 C
-1.09 C
1966
20.7 C
-0.47 C
1967
20.4 C
-0.74 C
1968
19.8 C
-1.29 C
1969
20.6 C
-0.53 C
1970
20.1 C
-1.02 C
1971
20.3 C
-0.88 C
1972
21.1 C
-0.04 C
1973
19.6 C
-1.49 C
1974
20.7 C
-0.41 C
1975
19.8 C
-1.38 C
1976
20.4 C
-0.78 C
1977
21.2 C
+0.03 C
1978
21.0 C
-0.17 C
1979
20.3 C
-0.87 C
1980
21.2 C
+0.09 C
1981
21.7 C
+0.58 C
1982
20.5 C
-0.66 C
1983
20.7 C
-0.39 C
1984
20.7 C
-0.46 C
1985
20.9 C
-0.23 C
1986
21.6 C
+0.42 C
1987
21.1 C
-0.05 C
1988
21.4 C
+0.27 C
1989
21.9 C
+0.74 C
1990
21.0 C
-0.12 C
1991
20.5 C
-0.61 C
1992
21.2 C
+0.06 C
1993
21.3 C
+0.16 C
1994
21.6 C
+0.48 C
1995
21.9 C
+0.76 C
1996
22.3 C
+1.15 C
1997
22.0 C
+0.85 C
1998
21.0 C
-0.11 C
1999
21.8 C
+0.65 C
2000
22.2 C
+1.04 C
2001
22.1 C
+0.97 C
2002
21.7 C
+0.58 C
2003
22.3 C
+1.15 C
2004
21.7 C
+0.58 C
2005
21.9 C
+0.80 C
2006
21.8 C
+0.70 C
2008
21.9 C
+0.78 C
2009
22.3 C
+1.20 C
2010
21.9 C
+0.73 C
2011
21.8 C
+0.64 C
2012
22.5 C
+1.38 C
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1961 to 2012. In Fahrenheit: 0.8 F (0.6 to 0.9) 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 Maricopa 4 N
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.3 to 0.5) per decade
0.8 F (0.6 to 0.9) per decade
1961 to 2012
51
Rise
Mean daily maximum
0.4 C (0.3 to 0.5) per decade
0.7 F (0.5 to 0.9) per decade
1961 to 2012
51
Rise
Mean daily minimum
0.5 C (0.4 to 0.6) per decade
0.8 F (0.7 to 1.0) per decade
1961 to 2012
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
1960 to 2013
Yearly extremes at Maricopa 4 N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
51.1 C (124.0 F)
1995
46.7 C (116.1 F)
54
Coldest night (TNn)
-10.6 C (12.9 F)
1964
-6.7 C (19.9 F)
54
Wettest day (Rx1day)
61.5 mm (2.4 in)
1967
26.2 mm (1.0 in)
54
Wettest five days (Rx5day)
97.8 mm (3.9 in)
1965
37.1 mm (1.5 in)
54
Longest dry spell (CDD)
155 days
1972
91 days
54
Hottest day (TXx)
The hottest day of the year at Maricopa 4 N, 1960 to 2013. The record is 51.1 C (124.0 F) in 1995, marked on the chart; the median year is 46.7 C (116.1 F).
Hottest day (TXx) at Maricopa 4 N by year
Year
Hottest day (TXx)
1960
47.2 C (117.0 F)
1961
46.7 C (116.1 F)
1962
46.1 C (115.0 F)
1963
45.6 C (114.1 F)
1964
46.1 C (115.0 F)
1965
48.9 C (120.0 F)
1966
46.1 C (115.0 F)
1967
45.0 C (113.0 F)
1968
47.8 C (118.0 F)
1969
47.2 C (117.0 F)
1970
47.8 C (118.0 F)
1971
46.1 C (115.0 F)
1972
47.2 C (117.0 F)
1973
47.2 C (117.0 F)
1974
47.2 C (117.0 F)
1975
46.7 C (116.1 F)
1976
46.1 C (115.0 F)
1977
46.1 C (115.0 F)
1978
46.1 C (115.0 F)
1979
47.2 C (117.0 F)
1980
46.1 C (115.0 F)
1981
46.7 C (116.1 F)
1982
45.6 C (114.1 F)
1983
46.7 C (116.1 F)
1984
45.0 C (113.0 F)
1985
46.1 C (115.0 F)
1986
46.7 C (116.1 F)
1987
45.0 C (113.0 F)
1988
46.7 C (116.1 F)
1989
47.8 C (118.0 F)
1990
50.0 C (122.0 F)
1991
45.0 C (113.0 F)
1992
45.0 C (113.0 F)
1993
47.2 C (117.0 F)
1994
48.9 C (120.0 F)
1995
51.1 C (124.0 F)
1996
46.1 C (115.0 F)
1997
46.7 C (116.1 F)
1998
47.8 C (118.0 F)
1999
45.0 C (113.0 F)
2000
46.1 C (115.0 F)
2001
47.8 C (118.0 F)
2002
46.1 C (115.0 F)
2003
47.8 C (118.0 F)
2004
45.0 C (113.0 F)
2005
47.8 C (118.0 F)
2006
47.8 C (118.0 F)
2007
47.2 C (117.0 F)
2008
46.7 C (116.1 F)
2009
46.7 C (116.1 F)
2010
46.1 C (115.0 F)
2011
48.3 C (118.9 F)
2012
47.2 C (117.0 F)
2013
47.8 C (118.0 F)
Coldest night (TNn)
The coldest night of the year at Maricopa 4 N, 1960 to 2013. The record is -10.6 C (12.9 F) in 1964, marked on the chart; the median year is -6.7 C (19.9 F).
Coldest night (TNn) at Maricopa 4 N by year
Year
Coldest night (TNn)
1960
-8.9 C (16.0 F)
1961
-7.2 C (19.0 F)
1962
-10.0 C (14.0 F)
1963
-8.9 C (16.0 F)
1964
-10.6 C (12.9 F)
1965
-6.1 C (21.0 F)
1966
-9.4 C (15.1 F)
1967
-8.9 C (16.0 F)
1968
-8.9 C (16.0 F)
1969
-6.1 C (21.0 F)
1970
-10.0 C (14.0 F)
1971
-10.0 C (14.0 F)
1972
-7.2 C (19.0 F)
1973
-5.6 C (21.9 F)
1974
-8.9 C (16.0 F)
1975
-7.8 C (18.0 F)
1976
-7.8 C (18.0 F)
1977
-3.9 C (25.0 F)
1978
-6.7 C (19.9 F)
1979
-4.4 C (24.1 F)
1980
-4.4 C (24.1 F)
1981
-5.6 C (21.9 F)
1982
-4.4 C (24.1 F)
1983
-3.9 C (25.0 F)
1984
-5.6 C (21.9 F)
1985
-6.1 C (21.0 F)
1986
-3.9 C (25.0 F)
1987
-9.4 C (15.1 F)
1988
-8.3 C (17.1 F)
1989
-8.3 C (17.1 F)
1990
-8.3 C (17.1 F)
1991
-6.7 C (19.9 F)
1992
-4.4 C (24.1 F)
1993
-7.2 C (19.0 F)
1994
-5.0 C (23.0 F)
1995
-4.4 C (24.1 F)
1996
-7.8 C (18.0 F)
1997
-6.7 C (19.9 F)
1998
-6.7 C (19.9 F)
1999
-5.6 C (21.9 F)
2000
-5.0 C (23.0 F)
2001
-5.6 C (21.9 F)
2002
-5.6 C (21.9 F)
2003
-7.8 C (18.0 F)
2004
-5.0 C (23.0 F)
2005
-7.2 C (19.0 F)
2006
-6.7 C (19.9 F)
2007
-9.4 C (15.1 F)
2008
-6.1 C (21.0 F)
2009
-6.1 C (21.0 F)
2010
-7.2 C (19.0 F)
2011
-10.0 C (14.0 F)
2012
-3.9 C (25.0 F)
2013
-9.4 C (15.1 F)
Wettest day (Rx1day)
The wettest day of the year at Maricopa 4 N, 1960 to 2013. The record is 61.5 mm (2.4 in) in 1967, marked on the chart; the median year is 26.2 mm (1.0 in).
Wettest day (Rx1day) at Maricopa 4 N by year
Year
Wettest day (Rx1day)
1960
11.9 mm (0.5 in)
1961
35.1 mm (1.4 in)
1962
22.9 mm (0.9 in)
1963
35.8 mm (1.4 in)
1964
25.4 mm (1.0 in)
1965
47.5 mm (1.9 in)
1966
35.3 mm (1.4 in)
1967
61.5 mm (2.4 in)
1968
45.7 mm (1.8 in)
1969
48.3 mm (1.9 in)
1970
18.8 mm (0.7 in)
1971
13.0 mm (0.5 in)
1972
44.7 mm (1.8 in)
1973
18.3 mm (0.7 in)
1974
19.3 mm (0.8 in)
1975
15.0 mm (0.6 in)
1976
21.8 mm (0.9 in)
1977
11.9 mm (0.5 in)
1978
33.0 mm (1.3 in)
1979
20.1 mm (0.8 in)
1980
19.1 mm (0.8 in)
1981
27.4 mm (1.1 in)
1982
31.0 mm (1.2 in)
1983
30.7 mm (1.2 in)
1984
36.3 mm (1.4 in)
1985
18.3 mm (0.7 in)
1986
30.5 mm (1.2 in)
1987
19.6 mm (0.8 in)
1988
44.5 mm (1.8 in)
1989
26.2 mm (1.0 in)
1990
30.5 mm (1.2 in)
1991
15.5 mm (0.6 in)
1992
38.1 mm (1.5 in)
1993
36.6 mm (1.4 in)
1994
24.6 mm (1.0 in)
1995
28.7 mm (1.1 in)
1996
15.5 mm (0.6 in)
1997
25.9 mm (1.0 in)
1998
23.6 mm (0.9 in)
1999
26.7 mm (1.1 in)
2000
41.9 mm (1.6 in)
2001
23.9 mm (0.9 in)
2002
25.7 mm (1.0 in)
2003
15.7 mm (0.6 in)
2004
23.4 mm (0.9 in)
2005
30.0 mm (1.2 in)
2006
49.8 mm (2.0 in)
2007
26.2 mm (1.0 in)
2008
32.8 mm (1.3 in)
2009
32.3 mm (1.3 in)
2010
24.1 mm (0.9 in)
2011
22.9 mm (0.9 in)
2012
26.7 mm (1.1 in)
2013
21.6 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Maricopa 4 N, 1960 to 2013. The record is 97.8 mm (3.9 in) in 1965, marked on the chart; the median year is 37.1 mm (1.5 in).
Wettest five days (Rx5day) at Maricopa 4 N by year
Year
Wettest five days (Rx5day)
1960
19.3 mm (0.8 in)
1961
43.2 mm (1.7 in)
1962
27.4 mm (1.1 in)
1963
35.8 mm (1.4 in)
1964
27.8 mm (1.1 in)
1965
97.8 mm (3.9 in)
1966
39.7 mm (1.6 in)
1967
76.5 mm (3.0 in)
1968
83.1 mm (3.3 in)
1969
80.8 mm (3.2 in)
1970
29.4 mm (1.2 in)
1971
24.4 mm (1.0 in)
1972
50.8 mm (2.0 in)
1973
29.7 mm (1.2 in)
1974
25.7 mm (1.0 in)
1975
24.1 mm (0.9 in)
1976
32.3 mm (1.3 in)
1977
18.3 mm (0.7 in)
1978
51.0 mm (2.0 in)
1979
36.6 mm (1.4 in)
1980
34.0 mm (1.3 in)
1981
42.9 mm (1.7 in)
1982
44.4 mm (1.7 in)
1983
66.0 mm (2.6 in)
1984
62.9 mm (2.5 in)
1985
18.8 mm (0.7 in)
1986
73.4 mm (2.9 in)
1987
37.2 mm (1.5 in)
1988
50.3 mm (2.0 in)
1989
26.2 mm (1.0 in)
1990
60.0 mm (2.4 in)
1991
26.4 mm (1.0 in)
1992
50.3 mm (2.0 in)
1993
87.4 mm (3.4 in)
1994
45.0 mm (1.8 in)
1995
35.3 mm (1.4 in)
1996
16.3 mm (0.6 in)
1997
25.9 mm (1.0 in)
1998
38.3 mm (1.5 in)
1999
44.7 mm (1.8 in)
2000
52.6 mm (2.1 in)
2001
24.4 mm (1.0 in)
2002
36.9 mm (1.5 in)
2003
21.3 mm (0.8 in)
2004
27.2 mm (1.1 in)
2005
49.5 mm (1.9 in)
2006
61.2 mm (2.4 in)
2007
31.2 mm (1.2 in)
2008
43.5 mm (1.7 in)
2009
32.3 mm (1.3 in)
2010
58.7 mm (2.3 in)
2011
26.1 mm (1.0 in)
2012
30.5 mm (1.2 in)
2013
46.0 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Maricopa 4 N, 1960 to 2013. The record is 155 days in 1972, marked on the chart; the median year is 91 days.
Longest dry spell (CDD) at Maricopa 4 N by year
Year
Longest dry spell (CDD)
1960
72 days
1961
95 days
1962
99 days
1963
85 days
1964
92 days
1965
41 days
1966
113 days
1967
77 days
1968
115 days
1969
78 days
1970
120 days
1971
91 days
1972
155 days
1973
98 days
1974
107 days
1975
94 days
1976
75 days
1977
64 days
1978
80 days
1979
69 days
1980
81 days
1981
85 days
1982
62 days
1983
78 days
1984
91 days
1985
100 days
1986
92 days
1987
78 days
1988
79 days
1989
117 days
1990
49 days
1991
113 days
1992
61 days
1993
104 days
1994
52 days
1995
114 days
1996
122 days
1997
96 days
1998
52 days
1999
99 days
2000
78 days
2001
61 days
2002
123 days
2003
99 days
2004
100 days
2005
90 days
2006
79 days
2007
75 days
2008
95 days
2009
69 days
2010
123 days
2011
91 days
2012
77 days
2013
97 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 Maricopa 4 N falls on 6 March and the median first autumn frost on 20 November, which leaves a median of 257 days between them.
Fitted over all years, the growing season changes by +6.7 days per decade at this station.
Frost dates and growing season at Maricopa 4 N
Measure
Median, all years
Earliest period
Recent period (1982 to 2012)
Recent against earliest
Fitted trend
Last spring frost
6 March
n/a
4 March
n/a
-5.0 days per decade
First autumn frost
20 November
n/a
24 November
n/a
+1.6 days per decade
Growing days
257 days
n/a
260 days
n/a
+6.7 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
52 years, 1961 to 2012
A day with at least 27.1 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 62.8 mm (2.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Maricopa 4 N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
27.1 mm (1.1 in)
5 years
36.8 mm (1.4 in)
10 years
43.2 mm (1.7 in)
25 years
51.1 mm (2.0 in)
50 years
57.0 mm (2.2 in)
100 years
62.8 mm (2.5 in)
Longer than the 52 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, 52 years of values from 1961 to 2012.
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: 61.5 mm (2.4 in) in 1967; 49.8 mm (2.0 in) in 2006; 48.3 mm (1.9 in) in 1969.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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Data for Maricopa 4 N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Maricopa 4 N 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.