Record envelope, standing records and threshold days for Wellton (USC00029211), Arizona, United States, with 59 years of record.
Key Facts for Wellton
Wellton (USC00029211) is a weather station in Arizona, United States at 32.67 latitude and -114.13 longitude, 79 m (259 ft) above sea level.
The station reports from 1922 to 1980, 59 years of record.
1,464 records set at Wellton still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Wellton set a daily record high maximum temperature of 25.6 C (78.1 F) on 30 December 1980.
About the Station
Location: Arizona, United States, 32.67 latitude, -114.13 longitude.
Elevation: 79 m (259 ft).
Period of record: 1922 to 1980, 59 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 Wellton. 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 Wellton, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
31.7 C (89.1 F)
-10.0 C (14.0 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)
-5.6 C (21.9 F)
n/a
n/a
Apr
40.6 C (105.1 F)
-0.6 C (30.9 F)
n/a
n/a
May
45.6 C (114.1 F)
3.3 C (37.9 F)
n/a
n/a
Jun
48.9 C (120.0 F)
8.3 C (46.9 F)
n/a
n/a
Jul
49.4 C (120.9 F)
12.2 C (54.0 F)
n/a
n/a
Aug
48.9 C (120.0 F)
10.0 C (50.0 F)
n/a
n/a
Sep
47.2 C (117.0 F)
5.6 C (42.1 F)
n/a
n/a
Oct
42.2 C (108.0 F)
0.0 C (32.0 F)
n/a
n/a
Nov
35.6 C (96.1 F)
-6.7 C (19.9 F)
n/a
n/a
Dec
30.0 C (86.0 F)
-8.9 C (16.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Wellton still stand. 1934 holds the most, with 65.
Standing records at Wellton by the year they were set
Year set
Standing records
1922
21
1923
10
1924
3
1925
32
1926
22
1927
21
1928
24
1929
29
1930
60
1931
30
1932
23
1933
47
1934
65
1935
28
1936
45
1937
35
1938
32
1939
22
1940
29
1941
29
1942
20
1943
43
1944
43
1945
27
1946
21
1947
25
1948
56
1949
29
1951
1
1952
23
1953
15
1954
16
1955
26
1956
28
1957
20
1958
21
1959
16
1960
23
1961
25
1962
26
1963
30
1964
21
1965
35
1966
17
1967
19
1968
15
1969
16
1970
9
1971
31
1972
18
1973
11
1974
13
1975
18
1976
17
1977
27
1978
20
1979
9
1980
27
All-Time Record Progression
3 new records
3 all-time records were set at Wellton between 30 December 1966 and 14 December 1967. Each dot is a new record.
When Wellton set new all-time records
Date
Kind
Detail
1966-12-30
Record low maximum temperature
Record low maximum temperature 7.2 C (45.0 F)
1967-09-02
Record daily precipitation
Record daily precipitation 82.6 mm (3.3 in)
1967-12-14
Record low maximum temperature
Record low maximum temperature 5.6 C (42.1 F)
Wettest Day of Each Month
Sep: 82.6 mm (3.3 in)
The wettest day on record for each calendar month at Wellton. The most was 82.6 mm (3.3 in) on 2 September 1967.
Record daily precipitation for each month at Wellton
Month
Record daily precipitation (mm)
Date
Jan
50.3 mm (2.0 in)
16 January 1979
Feb
48.5 mm (1.9 in)
24 February 1944
Mar
32.3 mm (1.3 in)
1 March 1970
Apr
25.4 mm (1.0 in)
3 April 1965
May
10.4 mm (0.4 in)
2 May 1930
Jun
13.5 mm (0.5 in)
6 June 1972
Jul
36.6 mm (1.4 in)
26 July 1976
Aug
55.4 mm (2.2 in)
7 August 1959
Sep
82.6 mm (3.3 in)
2 September 1967
Oct
56.6 mm (2.2 in)
6 October 1972
Nov
31.2 mm (1.2 in)
10 November 1969
Dec
55.6 mm (2.2 in)
4 December 1926
Period of Record Coverage
1922 to 1980
Complete yearUnder 90 percent of days
58 years of record at Wellton, 1922 to 1980. 14 years have data for under 90 percent of days and are left out of rankings: 1922, 1923, 1924, 1925, 1932, 1934, 1935, 1936 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 46 complete years at Wellton, 1926 to 1979. Blue stripes are years cooler than the station's own mean of 21.2 C (70.2 F); red stripes are warmer. The coolest year was 1975, at 20.1 C (68.2 F), and the warmest was 1936, at 22.5 C (72.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Wellton as warming stripes, 1926 to 1979
Year
Annual mean temperature
Difference from the station mean
1926
21.0 C
-0.19 C
1927
21.0 C
-0.21 C
1928
20.9 C
-0.33 C
1929
20.8 C
-0.46 C
1930
20.7 C
-0.49 C
1931
21.8 C
+0.53 C
1933
21.4 C
+0.20 C
1935
21.4 C
+0.12 C
1936
22.5 C
+1.28 C
1937
22.0 C
+0.77 C
1938
21.6 C
+0.35 C
1939
21.8 C
+0.56 C
1940
22.5 C
+1.26 C
1941
20.9 C
-0.33 C
1943
22.0 C
+0.73 C
1946
21.2 C
+0.00 C
1947
21.7 C
+0.43 C
1948
21.0 C
-0.24 C
1952
21.7 C
+0.49 C
1953
21.1 C
-0.10 C
1954
21.9 C
+0.67 C
1955
20.5 C
-0.70 C
1956
20.7 C
-0.53 C
1957
21.2 C
-0.01 C
1958
21.8 C
+0.52 C
1959
21.4 C
+0.17 C
1960
21.3 C
+0.06 C
1961
20.9 C
-0.31 C
1962
21.2 C
-0.07 C
1963
21.1 C
-0.18 C
1964
20.2 C
-1.03 C
1965
20.7 C
-0.50 C
1966
21.4 C
+0.20 C
1967
21.0 C
-0.27 C
1968
21.1 C
-0.15 C
1969
21.6 C
+0.39 C
1970
21.1 C
-0.09 C
1971
20.6 C
-0.66 C
1972
21.0 C
-0.28 C
1973
20.5 C
-0.78 C
1974
21.1 C
-0.11 C
1975
20.1 C
-1.14 C
1976
20.7 C
-0.53 C
1977
21.6 C
+0.36 C
1978
21.7 C
+0.50 C
1979
21.2 C
-0.06 C
The annual mean temperature here has fallen by 0.10 C (0.00 to 0.19) per decade over 1926 to 1979. In Fahrenheit: 0.18 F (0.01 to 0.35) per decade. The slope is a straight line fitted to 46 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Wellton
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.10 C (-0.19 to 0.00) per decade
-0.18 F (-0.35 to -0.01) per decade
1926 to 1979
46
Fall
Mean daily maximum
-0.3 C (-0.4 to -0.2) per decade
-0.5 F (-0.8 to -0.3) per decade
1926 to 1979
46
Fall
Mean daily minimum
0.10 C (-0.01 to 0.21) per decade
0.17 F (-0.03 to 0.37) per decade
1926 to 1979
46
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
1922 to 1980
Yearly extremes at Wellton: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
49.4 C (120.9 F)
1943
46.1 C (115.0 F)
58
Coldest night (TNn)
-10.0 C (14.0 F)
1937
-6.4 C (20.5 F)
58
Wettest day (Rx1day)
82.6 mm (3.3 in)
1967
23.1 mm (0.9 in)
58
Wettest five days (Rx5day)
121.5 mm (4.8 in)
1967
34.2 mm (1.3 in)
58
Longest dry spell (CDD)
187 days
1940
113 days
58
Hottest day (TXx)
The hottest day of the year at Wellton, 1922 to 1980. The record is 49.4 C (120.9 F) in 1943, marked on the chart; the median year is 46.1 C (115.0 F).
Hottest day (TXx) at Wellton by year
Year
Hottest day (TXx)
1922
46.1 C (115.0 F)
1923
46.7 C (116.1 F)
1924
44.4 C (111.9 F)
1925
46.7 C (116.1 F)
1926
45.6 C (114.1 F)
1927
46.7 C (116.1 F)
1928
45.6 C (114.1 F)
1929
46.7 C (116.1 F)
1930
46.1 C (115.0 F)
1931
46.7 C (116.1 F)
1932
46.7 C (116.1 F)
1933
48.9 C (120.0 F)
1934
47.2 C (117.0 F)
1935
46.7 C (116.1 F)
1936
48.9 C (120.0 F)
1937
48.9 C (120.0 F)
1938
46.1 C (115.0 F)
1939
47.8 C (118.0 F)
1940
47.8 C (118.0 F)
1941
46.7 C (116.1 F)
1942
48.3 C (118.9 F)
1943
49.4 C (120.9 F)
1944
47.2 C (117.0 F)
1945
46.7 C (116.1 F)
1946
46.1 C (115.0 F)
1947
46.7 C (116.1 F)
1948
47.2 C (117.0 F)
1949
46.7 C (116.1 F)
1951
29.4 C (84.9 F)
1952
46.1 C (115.0 F)
1953
44.4 C (111.9 F)
1954
46.7 C (116.1 F)
1955
44.4 C (111.9 F)
1956
44.4 C (111.9 F)
1957
46.7 C (116.1 F)
1958
45.6 C (114.1 F)
1959
44.4 C (111.9 F)
1960
45.6 C (114.1 F)
1961
46.1 C (115.0 F)
1962
43.9 C (111.0 F)
1963
45.0 C (113.0 F)
1964
46.1 C (115.0 F)
1965
45.0 C (113.0 F)
1966
45.0 C (113.0 F)
1967
45.0 C (113.0 F)
1968
46.7 C (116.1 F)
1969
47.2 C (117.0 F)
1970
46.7 C (116.1 F)
1971
45.6 C (114.1 F)
1972
45.6 C (114.1 F)
1973
43.9 C (111.0 F)
1974
45.6 C (114.1 F)
1975
44.4 C (111.9 F)
1976
45.6 C (114.1 F)
1977
44.4 C (111.9 F)
1978
45.0 C (113.0 F)
1979
45.0 C (113.0 F)
1980
45.0 C (113.0 F)
Coldest night (TNn)
The coldest night of the year at Wellton, 1922 to 1980. The record is -10.0 C (14.0 F) in 1937, marked on the chart; the median year is -6.4 C (20.5 F).
Coldest night (TNn) at Wellton by year
Year
Coldest night (TNn)
1922
2.2 C (36.0 F)
1923
-2.2 C (28.0 F)
1924
-3.9 C (25.0 F)
1925
-6.7 C (19.9 F)
1926
-6.7 C (19.9 F)
1927
-5.0 C (23.0 F)
1928
-7.2 C (19.0 F)
1929
-8.3 C (17.1 F)
1930
-8.9 C (16.0 F)
1931
-6.7 C (19.9 F)
1932
-8.9 C (16.0 F)
1933
-8.3 C (17.1 F)
1934
-7.2 C (19.0 F)
1935
-3.9 C (25.0 F)
1936
-5.6 C (21.9 F)
1937
-10.0 C (14.0 F)
1938
-6.1 C (21.0 F)
1939
-5.6 C (21.9 F)
1940
-7.8 C (18.0 F)
1941
-5.6 C (21.9 F)
1942
-5.0 C (23.0 F)
1943
-10.0 C (14.0 F)
1944
-7.2 C (19.0 F)
1945
-8.9 C (16.0 F)
1946
-6.7 C (19.9 F)
1947
-6.1 C (21.0 F)
1948
-10.0 C (14.0 F)
1949
-10.0 C (14.0 F)
1951
-6.7 C (19.9 F)
1952
-7.8 C (18.0 F)
1953
-7.8 C (18.0 F)
1954
-7.8 C (18.0 F)
1955
-3.9 C (25.0 F)
1956
-7.2 C (19.0 F)
1957
-3.9 C (25.0 F)
1958
-4.4 C (24.1 F)
1959
-4.4 C (24.1 F)
1960
-5.0 C (23.0 F)
1961
-4.4 C (24.1 F)
1962
-8.3 C (17.1 F)
1963
-8.9 C (16.0 F)
1964
-7.8 C (18.0 F)
1965
-3.3 C (26.1 F)
1966
-3.9 C (25.0 F)
1967
-5.6 C (21.9 F)
1968
-6.1 C (21.0 F)
1969
-5.0 C (23.0 F)
1970
-6.7 C (19.9 F)
1971
-9.4 C (15.1 F)
1972
-5.0 C (23.0 F)
1973
-4.4 C (24.1 F)
1974
-7.8 C (18.0 F)
1975
-5.0 C (23.0 F)
1976
-6.7 C (19.9 F)
1977
-3.3 C (26.1 F)
1978
-3.9 C (25.0 F)
1979
-2.2 C (28.0 F)
1980
-1.7 C (28.9 F)
Wettest day (Rx1day)
The wettest day of the year at Wellton, 1922 to 1980. The record is 82.6 mm (3.3 in) in 1967, marked on the chart; the median year is 23.1 mm (0.9 in).
Wettest day (Rx1day) at Wellton by year
Year
Wettest day (Rx1day)
1922
0.0 mm (0.00 in)
1923
45.7 mm (1.8 in)
1924
11.4 mm (0.4 in)
1925
46.2 mm (1.8 in)
1926
55.6 mm (2.2 in)
1927
19.6 mm (0.8 in)
1928
3.6 mm (0.14 in)
1929
31.8 mm (1.3 in)
1930
21.1 mm (0.8 in)
1931
21.3 mm (0.8 in)
1932
33.0 mm (1.3 in)
1933
10.9 mm (0.4 in)
1934
10.2 mm (0.4 in)
1935
31.8 mm (1.3 in)
1936
36.1 mm (1.4 in)
1937
10.4 mm (0.4 in)
1938
11.7 mm (0.5 in)
1939
30.5 mm (1.2 in)
1940
20.6 mm (0.8 in)
1941
33.5 mm (1.3 in)
1942
12.2 mm (0.5 in)
1943
19.6 mm (0.8 in)
1944
48.5 mm (1.9 in)
1945
26.2 mm (1.0 in)
1946
16.8 mm (0.7 in)
1947
30.5 mm (1.2 in)
1948
25.7 mm (1.0 in)
1949
16.5 mm (0.6 in)
1951
2.8 mm (0.11 in)
1952
14.2 mm (0.6 in)
1953
5.8 mm (0.23 in)
1954
10.2 mm (0.4 in)
1955
19.1 mm (0.8 in)
1956
5.1 mm (0.20 in)
1957
17.0 mm (0.7 in)
1958
35.6 mm (1.4 in)
1959
55.4 mm (2.2 in)
1960
27.7 mm (1.1 in)
1961
26.4 mm (1.0 in)
1962
24.9 mm (1.0 in)
1963
25.7 mm (1.0 in)
1964
26.2 mm (1.0 in)
1965
38.1 mm (1.5 in)
1966
13.2 mm (0.5 in)
1967
82.6 mm (3.3 in)
1968
12.2 mm (0.5 in)
1969
31.2 mm (1.2 in)
1970
32.3 mm (1.3 in)
1971
39.4 mm (1.6 in)
1972
56.6 mm (2.2 in)
1973
13.2 mm (0.5 in)
1974
26.2 mm (1.0 in)
1975
11.9 mm (0.5 in)
1976
59.2 mm (2.3 in)
1977
20.3 mm (0.8 in)
1978
15.7 mm (0.6 in)
1979
50.3 mm (2.0 in)
1980
9.4 mm (0.37 in)
Wettest five days (Rx5day)
The wettest five days of the year at Wellton, 1922 to 1980. The record is 121.5 mm (4.8 in) in 1967, marked on the chart; the median year is 34.2 mm (1.3 in).
Wettest five days (Rx5day) at Wellton by year
Year
Wettest five days (Rx5day)
1922
0.0 mm (0.00 in)
1923
55.9 mm (2.2 in)
1924
45.7 mm (1.8 in)
1925
46.2 mm (1.8 in)
1926
56.6 mm (2.2 in)
1927
25.0 mm (1.0 in)
1928
3.6 mm (0.14 in)
1929
31.8 mm (1.3 in)
1930
56.7 mm (2.2 in)
1931
49.7 mm (2.0 in)
1932
33.0 mm (1.3 in)
1933
25.6 mm (1.0 in)
1934
15.3 mm (0.6 in)
1935
35.3 mm (1.4 in)
1936
43.5 mm (1.7 in)
1937
10.4 mm (0.4 in)
1938
19.4 mm (0.8 in)
1939
49.0 mm (1.9 in)
1940
29.5 mm (1.2 in)
1941
47.2 mm (1.9 in)
1942
12.2 mm (0.5 in)
1943
19.6 mm (0.8 in)
1944
61.2 mm (2.4 in)
1945
36.1 mm (1.4 in)
1946
24.4 mm (1.0 in)
1947
51.1 mm (2.0 in)
1948
38.4 mm (1.5 in)
1949
29.7 mm (1.2 in)
1951
2.8 mm (0.11 in)
1952
17.8 mm (0.7 in)
1953
6.8 mm (0.27 in)
1954
20.4 mm (0.8 in)
1955
32.3 mm (1.3 in)
1956
6.4 mm (0.25 in)
1957
22.3 mm (0.9 in)
1958
35.6 mm (1.4 in)
1959
56.2 mm (2.2 in)
1960
38.1 mm (1.5 in)
1961
40.6 mm (1.6 in)
1962
24.9 mm (1.0 in)
1963
39.4 mm (1.6 in)
1964
38.1 mm (1.5 in)
1965
38.1 mm (1.5 in)
1966
16.2 mm (0.6 in)
1967
121.5 mm (4.8 in)
1968
21.9 mm (0.9 in)
1969
37.0 mm (1.5 in)
1970
42.7 mm (1.7 in)
1971
39.4 mm (1.6 in)
1972
61.2 mm (2.4 in)
1973
28.2 mm (1.1 in)
1974
41.0 mm (1.6 in)
1975
12.5 mm (0.5 in)
1976
65.8 mm (2.6 in)
1977
25.4 mm (1.0 in)
1978
19.3 mm (0.8 in)
1979
58.2 mm (2.3 in)
1980
17.3 mm (0.7 in)
Longest dry spell (CDD)
The longest dry spell of the year at Wellton, 1922 to 1980. The record is 187 days in 1940, marked on the chart; the median year is 113 days.
Longest dry spell (CDD) at Wellton by year
Year
Longest dry spell (CDD)
1922
64 days
1923
57 days
1924
78 days
1925
67 days
1926
78 days
1927
92 days
1928
146 days
1929
169 days
1930
82 days
1931
70 days
1932
82 days
1933
77 days
1934
90 days
1935
152 days
1936
148 days
1937
106 days
1938
113 days
1939
117 days
1940
187 days
1941
102 days
1942
119 days
1943
120 days
1944
140 days
1945
136 days
1946
100 days
1947
104 days
1948
79 days
1949
106 days
1951
41 days
1952
103 days
1953
131 days
1954
111 days
1955
182 days
1956
170 days
1957
117 days
1958
87 days
1959
127 days
1960
125 days
1961
181 days
1962
148 days
1963
140 days
1964
164 days
1965
130 days
1966
168 days
1967
102 days
1968
138 days
1969
70 days
1970
158 days
1971
87 days
1972
157 days
1973
141 days
1974
128 days
1975
107 days
1976
77 days
1977
142 days
1978
113 days
1979
82 days
1980
78 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Wellton falls on 5 March and the median first autumn frost on 19 November, which leaves a median of 265 days between them.
Fitted over all years, the growing season changes by +7.8 days per decade at this station.
Frost dates and growing season at Wellton
Measure
Median, all years
Earliest period
Recent period (1946 to 1979)
Recent against earliest
Fitted trend
Last spring frost
5 March
n/a
1 March
n/a
-4.7 days per decade
First autumn frost
19 November
n/a
24 November
n/a
+3.1 days per decade
Growing days
265 days
n/a
269 days
n/a
+7.8 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
51 years, 1926 to 1979
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 82.3 mm (3.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Wellton: 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
37.5 mm (1.5 in)
10 years
47.5 mm (1.9 in)
25 years
60.9 mm (2.4 in)
50 years
71.4 mm (2.8 in)
100 years
82.3 mm (3.2 in)
Longer than the 51 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, 51 years of values from 1926 to 1979.
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: 82.6 mm (3.3 in) in 1967; 59.2 mm (2.3 in) in 1976; 56.6 mm (2.2 in) in 1972.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Wellton, at 1953. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1953 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Wellton, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1953
-0.3
-0.5
possible
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 Wellton standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Wellton 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.