Record envelope, standing records and threshold days for Tucson WFO (USC00028815), Arizona, United States, with 115 years of record.
Key Facts for Tucson WFO
Tucson WFO (USC00028815) is a weather station in Arizona, United States at 32.23 latitude and -110.95 longitude, 742 m (2,435 ft) above sea level.
The station reports from 1894 to 2008, 115 years of record.
1,464 records set at Tucson WFO still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Tucson WFO set a daily record high minimum temperature of 13.3 C (55.9 F) on 6 January 2008.
About the Station
Location: Arizona, United States, 32.23 latitude, -110.95 longitude.
Elevation: 742 m (2,435 ft).
Period of record: 1894 to 2008, 115 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 Tucson WFO. 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 Tucson WFO, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
32.2 C (90.0 F)
-14.4 C (6.1 F)
n/a
n/a
Feb
33.9 C (93.0 F)
-8.3 C (17.1 F)
n/a
n/a
Mar
36.7 C (98.1 F)
-5.6 C (21.9 F)
n/a
n/a
Apr
40.0 C (104.0 F)
-2.2 C (28.0 F)
n/a
n/a
May
43.9 C (111.0 F)
0.0 C (32.0 F)
n/a
n/a
Jun
46.1 C (115.0 F)
6.1 C (43.0 F)
n/a
n/a
Jul
46.1 C (115.0 F)
9.4 C (48.9 F)
n/a
n/a
Aug
44.4 C (111.9 F)
12.8 C (55.0 F)
n/a
n/a
Sep
44.4 C (111.9 F)
5.6 C (42.1 F)
n/a
n/a
Oct
40.0 C (104.0 F)
-1.7 C (28.9 F)
n/a
n/a
Nov
34.4 C (93.9 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
31.1 C (88.0 F)
-12.2 C (10.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Tucson WFO still stand. 1994 holds the most, with 61.
Standing records at Tucson WFO by the year they were set
Year set
Standing records
1894
3
1895
15
1896
13
1897
10
1898
14
1899
21
1900
15
1901
8
1902
10
1903
14
1904
7
1905
25
1906
19
1907
11
1908
15
1909
23
1910
19
1911
17
1912
21
1913
28
1914
5
1915
20
1916
15
1917
19
1918
14
1919
11
1920
15
1921
23
1922
15
1923
7
1924
12
1925
14
1926
5
1927
11
1928
8
1929
8
1930
13
1931
11
1932
9
1933
12
1934
16
1935
9
1936
8
1937
9
1938
7
1939
9
1940
8
1941
9
1942
4
1943
14
1944
7
1945
9
1946
11
1947
14
1948
18
1949
22
1950
32
1951
14
1952
11
1953
15
1954
7
1955
17
1956
5
1957
12
1958
9
1959
9
1960
8
1961
5
1962
15
1963
13
1964
8
1965
13
1966
7
1967
12
1968
10
1969
11
1970
9
1971
13
1972
11
1973
11
1974
13
1975
8
1976
6
1977
12
1978
12
1979
7
1980
16
1981
11
1982
4
1983
5
1984
8
1985
13
1986
16
1987
13
1988
12
1989
19
1990
15
1991
10
1992
20
1993
24
1994
61
1995
15
1996
19
1997
23
1998
5
1999
8
2000
11
2001
7
2002
5
2003
8
2004
15
2005
9
2006
14
2007
13
2008
1
All-Time Record Progression
10 new records
10 all-time records were set at Tucson WFO between 6 July 1925 and 28 June 1994. Each dot is a new record.
When Tucson WFO set new all-time records
Date
Kind
Detail
1925-07-06
Record high minimum temperature
Record high minimum temperature 30.6 C (87.1 F)
1935-08-01
Record daily precipitation
Record daily precipitation 73.2 mm (2.9 in)
1949-01-03
Record low maximum temperature
Record low maximum temperature 1.7 C (35.1 F)
1960-06-18
Record high maximum temperature
Record high maximum temperature 45.0 C (113.0 F)
1960-06-19
Record high maximum temperature
Record high maximum temperature 46.1 C (115.0 F)
1983-10-01
Record daily precipitation
Record daily precipitation 105.7 mm (4.2 in)
1990-06-27
Record high minimum temperature
Record high minimum temperature 31.1 C (88.0 F)
1993-07-29
Record high minimum temperature
Record high minimum temperature 32.2 C (90.0 F)
1994-06-27
Record high minimum temperature
Record high minimum temperature 33.3 C (91.9 F)
1994-06-28
Record high minimum temperature
Record high minimum temperature 34.4 C (93.9 F)
Wettest Day of Each Month
Oct: 105.7 mm (4.2 in)
The wettest day on record for each calendar month at Tucson WFO. The most was 105.7 mm (4.2 in) on 1 October 1983.
Record daily precipitation for each month at Tucson WFO
Month
Record daily precipitation (mm)
Date
Jan
66.8 mm (2.6 in)
19 January 1916
Feb
31.8 mm (1.3 in)
25 February 1987
Mar
36.1 mm (1.4 in)
25 March 1903
Apr
32.3 mm (1.3 in)
15 April 1988
May
34.0 mm (1.3 in)
15 May 1931
Jun
39.6 mm (1.6 in)
28 June 1938
Jul
59.9 mm (2.4 in)
30 July 1950
Aug
73.2 mm (2.9 in)
1 August 1935
Sep
72.1 mm (2.8 in)
26 September 1962
Oct
105.7 mm (4.2 in)
1 October 1983
Nov
53.1 mm (2.1 in)
22 November 1931
Dec
54.6 mm (2.1 in)
3 December 1906
Period of Record Coverage
1894 to 2008
Complete yearUnder 90 percent of days
115 years of record at Tucson WFO, 1894 to 2008. 5 years have data for under 90 percent of days and are left out of rankings: 1894, 1896, 1965, 1997, 2008.
Cooler than the station meanWarmer than the station mean
One stripe for each of 106 complete years at Tucson WFO, 1895 to 2006. Blue stripes are years cooler than the station's own mean of 20.4 C (68.7 F); red stripes are warmer. The coolest year was 1905, at 18.3 C (65.0 F), and the warmest was 1994, at 23.0 C (73.5 F). The strongest colour marks a difference of 2.7 C (4.9 F).
Annual mean temperature at Tucson WFO as warming stripes, 1895 to 2006
Year
Annual mean temperature
Difference from the station mean
1895
19.6 C
-0.73 C
1897
19.3 C
-1.03 C
1899
19.1 C
-1.30 C
1900
19.8 C
-0.56 C
1901
19.6 C
-0.77 C
1902
19.4 C
-0.98 C
1903
18.9 C
-1.52 C
1904
19.3 C
-1.12 C
1905
18.3 C
-2.06 C
1906
19.4 C
-0.96 C
1907
19.6 C
-0.76 C
1908
18.8 C
-1.56 C
1909
18.7 C
-1.63 C
1910
20.3 C
-0.06 C
1911
19.3 C
-1.07 C
1912
18.3 C
-2.03 C
1913
18.5 C
-1.92 C
1914
19.7 C
-0.63 C
1916
19.3 C
-1.12 C
1917
19.1 C
-1.30 C
1918
19.6 C
-0.78 C
1919
18.7 C
-1.70 C
1920
18.6 C
-1.75 C
1921
19.4 C
-0.96 C
1922
19.2 C
-1.14 C
1923
19.0 C
-1.39 C
1924
19.6 C
-0.77 C
1925
19.7 C
-0.64 C
1926
19.9 C
-0.49 C
1927
20.0 C
-0.39 C
1928
19.9 C
-0.48 C
1929
19.1 C
-1.24 C
1930
19.6 C
-0.77 C
1931
19.5 C
-0.84 C
1932
19.1 C
-1.27 C
1933
19.3 C
-1.06 C
1934
20.5 C
+0.14 C
1935
19.2 C
-1.21 C
1936
19.9 C
-0.45 C
1937
19.6 C
-0.75 C
1939
20.0 C
-0.36 C
1940
20.3 C
-0.10 C
1941
19.5 C
-0.86 C
1942
19.5 C
-0.83 C
1943
20.1 C
-0.31 C
1944
19.5 C
-0.88 C
1945
19.2 C
-1.20 C
1946
19.4 C
-0.96 C
1947
19.7 C
-0.67 C
1948
20.3 C
-0.10 C
1949
20.0 C
-0.34 C
1950
20.9 C
+0.56 C
1951
20.6 C
+0.24 C
1952
20.6 C
+0.18 C
1953
20.6 C
+0.20 C
1954
21.0 C
+0.67 C
1955
19.4 C
-0.97 C
1956
20.8 C
+0.38 C
1957
20.9 C
+0.55 C
1958
20.9 C
+0.57 C
1959
21.0 C
+0.63 C
1960
20.9 C
+0.52 C
1961
20.6 C
+0.24 C
1962
20.8 C
+0.39 C
1963
20.4 C
+0.05 C
1964
19.3 C
-1.09 C
1966
20.2 C
-0.22 C
1967
20.3 C
-0.10 C
1968
20.9 C
+0.56 C
1969
21.4 C
+1.01 C
1970
20.7 C
+0.33 C
1971
20.1 C
-0.23 C
1972
21.3 C
+0.91 C
1973
21.1 C
+0.75 C
1974
21.2 C
+0.79 C
1975
20.6 C
+0.27 C
1976
21.3 C
+0.89 C
1977
21.7 C
+1.37 C
1978
21.6 C
+1.25 C
1979
21.2 C
+0.78 C
1980
22.3 C
+1.88 C
1981
22.3 C
+1.93 C
1982
21.1 C
+0.76 C
1983
21.0 C
+0.60 C
1984
21.0 C
+0.59 C
1985
21.4 C
+1.01 C
1986
22.0 C
+1.62 C
1987
21.6 C
+1.25 C
1988
22.0 C
+1.60 C
1989
22.6 C
+2.25 C
1990
21.2 C
+0.87 C
1991
21.4 C
+1.06 C
1992
22.1 C
+1.77 C
1993
22.8 C
+2.44 C
1994
23.0 C
+2.67 C
1995
22.6 C
+2.24 C
1996
22.6 C
+2.18 C
1998
20.2 C
-0.16 C
1999
21.0 C
+0.66 C
2000
21.5 C
+1.11 C
2001
21.5 C
+1.10 C
2002
21.6 C
+1.23 C
2003
22.0 C
+1.62 C
2004
21.3 C
+0.91 C
2005
22.0 C
+1.60 C
2006
21.7 C
+1.35 C
The annual mean temperature here has risen by 0.3 C (0.3 to 0.3) per decade over 1895 to 2006. In Fahrenheit: 0.5 F (0.5 to 0.6) per decade. The slope is a straight line fitted to 106 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Tucson WFO
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.3 to 0.3) per decade
0.5 F (0.5 to 0.6) per decade
1895 to 2006
106
Rise
Mean daily maximum
0.09 C (0.04 to 0.13) per decade
0.2 F (0.1 to 0.2) per decade
1895 to 2006
106
Rise
Mean daily minimum
0.5 C (0.5 to 0.6) per decade
0.9 F (0.8 to 1.0) per decade
1895 to 2006
106
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
1894 to 2008
Yearly extremes at Tucson WFO: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1960
43.3 C (109.9 F)
115
Coldest night (TNn)
-14.4 C (6.1 F)
1913
-5.0 C (23.0 F)
115
Wettest day (Rx1day)
105.7 mm (4.2 in)
1983
35.6 mm (1.4 in)
115
Wettest five days (Rx5day)
186.0 mm (7.3 in)
1983
48.3 mm (1.9 in)
115
Longest dry spell (CDD)
149 days
1972
69 days
115
Hottest day (TXx)
The hottest day of the year at Tucson WFO, 1894 to 2008. The record is 46.1 C (115.0 F) in 1960, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at Tucson WFO by year
Year
Hottest day (TXx)
1894
38.9 C (102.0 F)
1895
42.2 C (108.0 F)
1896
43.3 C (109.9 F)
1897
40.6 C (105.1 F)
1898
42.2 C (108.0 F)
1899
41.7 C (107.1 F)
1900
42.2 C (108.0 F)
1901
42.2 C (108.0 F)
1902
44.4 C (111.9 F)
1903
42.2 C (108.0 F)
1904
41.7 C (107.1 F)
1905
41.7 C (107.1 F)
1906
42.2 C (108.0 F)
1907
43.9 C (111.0 F)
1908
42.2 C (108.0 F)
1909
42.2 C (108.0 F)
1910
43.9 C (111.0 F)
1911
41.7 C (107.1 F)
1912
42.2 C (108.0 F)
1913
42.8 C (109.0 F)
1914
41.7 C (107.1 F)
1915
43.3 C (109.9 F)
1916
41.7 C (107.1 F)
1917
43.3 C (109.9 F)
1918
43.3 C (109.9 F)
1919
43.9 C (111.0 F)
1920
43.9 C (111.0 F)
1921
42.8 C (109.0 F)
1922
43.9 C (111.0 F)
1923
43.3 C (109.9 F)
1924
43.3 C (109.9 F)
1925
42.8 C (109.0 F)
1926
42.8 C (109.0 F)
1927
42.2 C (108.0 F)
1928
41.7 C (107.1 F)
1929
43.9 C (111.0 F)
1930
43.3 C (109.9 F)
1931
42.2 C (108.0 F)
1932
43.3 C (109.9 F)
1933
43.9 C (111.0 F)
1934
42.8 C (109.0 F)
1935
41.1 C (106.0 F)
1936
43.9 C (111.0 F)
1937
43.3 C (109.9 F)
1938
42.2 C (108.0 F)
1939
41.7 C (107.1 F)
1940
42.8 C (109.0 F)
1941
42.2 C (108.0 F)
1942
43.3 C (109.9 F)
1943
43.3 C (109.9 F)
1944
44.4 C (111.9 F)
1945
43.3 C (109.9 F)
1946
42.2 C (108.0 F)
1947
43.9 C (111.0 F)
1948
43.9 C (111.0 F)
1949
43.3 C (109.9 F)
1950
44.4 C (111.9 F)
1951
42.8 C (109.0 F)
1952
43.3 C (109.9 F)
1953
44.4 C (111.9 F)
1954
42.8 C (109.0 F)
1955
43.3 C (109.9 F)
1956
43.3 C (109.9 F)
1957
43.9 C (111.0 F)
1958
44.4 C (111.9 F)
1959
42.8 C (109.0 F)
1960
46.1 C (115.0 F)
1961
42.2 C (108.0 F)
1962
43.3 C (109.9 F)
1963
43.3 C (109.9 F)
1964
43.9 C (111.0 F)
1965
43.9 C (111.0 F)
1966
43.3 C (109.9 F)
1967
42.2 C (108.0 F)
1968
45.6 C (114.1 F)
1969
43.3 C (109.9 F)
1970
43.9 C (111.0 F)
1971
42.2 C (108.0 F)
1972
42.8 C (109.0 F)
1973
43.3 C (109.9 F)
1974
44.4 C (111.9 F)
1975
43.3 C (109.9 F)
1976
42.8 C (109.0 F)
1977
42.2 C (108.0 F)
1978
43.3 C (109.9 F)
1979
43.3 C (109.9 F)
1980
43.9 C (111.0 F)
1981
41.7 C (107.1 F)
1982
40.6 C (105.1 F)
1983
44.4 C (111.9 F)
1984
41.7 C (107.1 F)
1985
43.9 C (111.0 F)
1986
42.2 C (108.0 F)
1987
41.7 C (107.1 F)
1988
43.9 C (111.0 F)
1989
44.4 C (111.9 F)
1990
46.1 C (115.0 F)
1991
42.2 C (108.0 F)
1992
43.9 C (111.0 F)
1993
45.0 C (113.0 F)
1994
45.6 C (114.1 F)
1995
46.1 C (115.0 F)
1996
43.3 C (109.9 F)
1997
45.0 C (113.0 F)
1998
42.8 C (109.0 F)
1999
40.6 C (105.1 F)
2000
41.7 C (107.1 F)
2001
42.8 C (109.0 F)
2002
42.8 C (109.0 F)
2003
42.8 C (109.0 F)
2004
41.7 C (107.1 F)
2005
42.8 C (109.0 F)
2006
42.8 C (109.0 F)
2007
42.8 C (109.0 F)
2008
30.0 C (86.0 F)
Coldest night (TNn)
The coldest night of the year at Tucson WFO, 1894 to 2008. The record is -14.4 C (6.1 F) in 1913, marked on the chart; the median year is -5.0 C (23.0 F).
Coldest night (TNn) at Tucson WFO by year
Year
Coldest night (TNn)
1894
-1.1 C (30.0 F)
1895
-10.0 C (14.0 F)
1896
-5.0 C (23.0 F)
1897
-8.9 C (16.0 F)
1898
-8.3 C (17.1 F)
1899
-8.3 C (17.1 F)
1900
-3.9 C (25.0 F)
1901
-12.2 C (10.0 F)
1902
-4.4 C (24.1 F)
1903
-6.1 C (21.0 F)
1904
-9.4 C (15.1 F)
1905
-11.7 C (10.9 F)
1906
-5.6 C (21.9 F)
1907
-6.7 C (19.9 F)
1908
-5.6 C (21.9 F)
1909
-8.3 C (17.1 F)
1910
-9.4 C (15.1 F)
1911
-8.9 C (16.0 F)
1912
-7.8 C (18.0 F)
1913
-14.4 C (6.1 F)
1914
-5.6 C (21.9 F)
1915
-7.2 C (19.0 F)
1916
-9.4 C (15.1 F)
1917
-5.6 C (21.9 F)
1918
-7.8 C (18.0 F)
1919
-6.7 C (19.9 F)
1920
-7.2 C (19.0 F)
1921
-7.2 C (19.0 F)
1922
-8.3 C (17.1 F)
1923
-7.2 C (19.0 F)
1924
-4.4 C (24.1 F)
1925
-7.8 C (18.0 F)
1926
-4.4 C (24.1 F)
1927
-4.4 C (24.1 F)
1928
-5.6 C (21.9 F)
1929
-5.6 C (21.9 F)
1930
-6.7 C (19.9 F)
1931
-5.0 C (23.0 F)
1932
-7.2 C (19.0 F)
1933
-7.8 C (18.0 F)
1934
-6.1 C (21.0 F)
1935
-6.1 C (21.0 F)
1936
-5.6 C (21.9 F)
1937
-9.4 C (15.1 F)
1938
-3.3 C (26.1 F)
1939
-4.4 C (24.1 F)
1940
-5.6 C (21.9 F)
1941
-3.3 C (26.1 F)
1942
-3.9 C (25.0 F)
1943
-5.0 C (23.0 F)
1944
-5.6 C (21.9 F)
1945
-7.2 C (19.0 F)
1946
-6.7 C (19.9 F)
1947
-5.6 C (21.9 F)
1948
-6.7 C (19.9 F)
1949
-8.9 C (16.0 F)
1950
-7.8 C (18.0 F)
1951
-3.9 C (25.0 F)
1952
-5.0 C (23.0 F)
1953
-5.6 C (21.9 F)
1954
-7.8 C (18.0 F)
1955
-7.2 C (19.0 F)
1956
-4.4 C (24.1 F)
1957
-2.2 C (28.0 F)
1958
-3.3 C (26.1 F)
1959
-2.2 C (28.0 F)
1960
-6.1 C (21.0 F)
1961
-1.7 C (28.9 F)
1962
-6.7 C (19.9 F)
1963
-7.2 C (19.0 F)
1964
-8.9 C (16.0 F)
1965
-6.1 C (21.0 F)
1966
-6.7 C (19.9 F)
1967
-6.7 C (19.9 F)
1968
-5.6 C (21.9 F)
1969
-2.2 C (28.0 F)
1970
-3.9 C (25.0 F)
1971
-7.2 C (19.0 F)
1972
-3.3 C (26.1 F)
1973
-1.1 C (30.0 F)
1974
-3.3 C (26.1 F)
1975
-1.1 C (30.0 F)
1976
-2.8 C (27.0 F)
1977
-1.1 C (30.0 F)
1978
-5.6 C (21.9 F)
1979
-3.9 C (25.0 F)
1980
1.7 C (35.1 F)
1981
0.0 C (32.0 F)
1982
0.0 C (32.0 F)
1983
0.0 C (32.0 F)
1984
-1.1 C (30.0 F)
1985
-2.2 C (28.0 F)
1986
1.1 C (34.0 F)
1987
-3.3 C (26.1 F)
1988
-3.3 C (26.1 F)
1989
-2.2 C (28.0 F)
1990
-3.9 C (25.0 F)
1991
0.0 C (32.0 F)
1992
-0.6 C (30.9 F)
1993
1.1 C (34.0 F)
1994
0.6 C (33.1 F)
1995
0.6 C (33.1 F)
1996
-1.1 C (30.0 F)
1997
-1.1 C (30.0 F)
1998
-2.2 C (28.0 F)
1999
-1.7 C (28.9 F)
2000
-1.1 C (30.0 F)
2001
-0.6 C (30.9 F)
2002
-1.7 C (28.9 F)
2003
-3.3 C (26.1 F)
2004
-1.1 C (30.0 F)
2005
-1.1 C (30.0 F)
2006
-1.7 C (28.9 F)
2007
-2.8 C (27.0 F)
2008
-1.1 C (30.0 F)
Wettest day (Rx1day)
The wettest day of the year at Tucson WFO, 1894 to 2008. The record is 105.7 mm (4.2 in) in 1983, marked on the chart; the median year is 35.6 mm (1.4 in).
Wettest day (Rx1day) at Tucson WFO by year
Year
Wettest day (Rx1day)
1894
16.5 mm (0.6 in)
1895
46.5 mm (1.8 in)
1896
24.6 mm (1.0 in)
1897
38.6 mm (1.5 in)
1898
50.5 mm (2.0 in)
1899
16.8 mm (0.7 in)
1900
32.3 mm (1.3 in)
1901
20.1 mm (0.8 in)
1902
41.7 mm (1.6 in)
1903
36.1 mm (1.4 in)
1904
23.9 mm (0.9 in)
1905
29.7 mm (1.2 in)
1906
54.6 mm (2.1 in)
1907
47.0 mm (1.9 in)
1908
46.7 mm (1.8 in)
1909
26.9 mm (1.1 in)
1910
46.2 mm (1.8 in)
1911
33.0 mm (1.3 in)
1912
30.5 mm (1.2 in)
1913
19.1 mm (0.8 in)
1914
34.3 mm (1.4 in)
1915
35.6 mm (1.4 in)
1916
66.8 mm (2.6 in)
1917
35.6 mm (1.4 in)
1918
18.8 mm (0.7 in)
1919
48.3 mm (1.9 in)
1920
26.7 mm (1.1 in)
1921
53.8 mm (2.1 in)
1922
25.9 mm (1.0 in)
1923
63.0 mm (2.5 in)
1924
15.5 mm (0.6 in)
1925
27.7 mm (1.1 in)
1926
35.1 mm (1.4 in)
1927
33.0 mm (1.3 in)
1928
18.0 mm (0.7 in)
1929
47.8 mm (1.9 in)
1930
31.2 mm (1.2 in)
1931
53.1 mm (2.1 in)
1932
23.9 mm (0.9 in)
1933
36.8 mm (1.4 in)
1934
23.4 mm (0.9 in)
1935
73.2 mm (2.9 in)
1936
50.8 mm (2.0 in)
1937
22.1 mm (0.9 in)
1938
39.6 mm (1.6 in)
1939
30.0 mm (1.2 in)
1940
57.2 mm (2.3 in)
1941
36.8 mm (1.4 in)
1942
30.2 mm (1.2 in)
1943
54.6 mm (2.1 in)
1944
38.6 mm (1.5 in)
1945
40.4 mm (1.6 in)
1946
37.3 mm (1.5 in)
1947
16.0 mm (0.6 in)
1948
15.2 mm (0.6 in)
1949
17.5 mm (0.7 in)
1950
59.9 mm (2.4 in)
1951
41.1 mm (1.6 in)
1952
29.7 mm (1.2 in)
1953
39.4 mm (1.6 in)
1954
40.4 mm (1.6 in)
1955
39.9 mm (1.6 in)
1956
20.8 mm (0.8 in)
1957
18.8 mm (0.7 in)
1958
37.1 mm (1.5 in)
1959
53.3 mm (2.1 in)
1960
25.4 mm (1.0 in)
1961
38.9 mm (1.5 in)
1962
72.1 mm (2.8 in)
1963
35.1 mm (1.4 in)
1964
34.3 mm (1.4 in)
1965
27.2 mm (1.1 in)
1966
39.1 mm (1.5 in)
1967
50.0 mm (2.0 in)
1968
38.4 mm (1.5 in)
1969
14.7 mm (0.6 in)
1970
39.9 mm (1.6 in)
1971
28.7 mm (1.1 in)
1972
46.2 mm (1.8 in)
1973
29.2 mm (1.1 in)
1974
48.3 mm (1.9 in)
1975
30.5 mm (1.2 in)
1976
16.5 mm (0.6 in)
1977
31.5 mm (1.2 in)
1978
41.9 mm (1.6 in)
1979
28.4 mm (1.1 in)
1980
38.9 mm (1.5 in)
1981
22.1 mm (0.9 in)
1982
39.1 mm (1.5 in)
1983
105.7 mm (4.2 in)
1984
51.1 mm (2.0 in)
1985
29.5 mm (1.2 in)
1986
41.1 mm (1.6 in)
1987
31.8 mm (1.3 in)
1988
32.3 mm (1.3 in)
1989
31.8 mm (1.3 in)
1990
37.3 mm (1.5 in)
1991
50.3 mm (2.0 in)
1992
29.5 mm (1.2 in)
1993
38.4 mm (1.5 in)
1994
46.5 mm (1.8 in)
1995
57.2 mm (2.3 in)
1996
40.6 mm (1.6 in)
1997
12.7 mm (0.5 in)
1998
39.1 mm (1.5 in)
1999
24.1 mm (0.9 in)
2000
37.6 mm (1.5 in)
2001
22.1 mm (0.9 in)
2002
20.8 mm (0.8 in)
2003
34.3 mm (1.4 in)
2004
22.6 mm (0.9 in)
2005
37.6 mm (1.5 in)
2006
51.1 mm (2.0 in)
2007
36.6 mm (1.4 in)
2008
11.9 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Tucson WFO, 1894 to 2008. The record is 186.0 mm (7.3 in) in 1983, marked on the chart; the median year is 48.3 mm (1.9 in).
Wettest five days (Rx5day) at Tucson WFO by year
Year
Wettest five days (Rx5day)
1894
19.5 mm (0.8 in)
1895
71.9 mm (2.8 in)
1896
39.9 mm (1.6 in)
1897
44.9 mm (1.8 in)
1898
65.3 mm (2.6 in)
1899
27.6 mm (1.1 in)
1900
62.2 mm (2.4 in)
1901
40.9 mm (1.6 in)
1902
46.5 mm (1.8 in)
1903
40.2 mm (1.6 in)
1904
40.6 mm (1.6 in)
1905
52.5 mm (2.1 in)
1906
82.0 mm (3.2 in)
1907
49.0 mm (1.9 in)
1908
61.6 mm (2.4 in)
1909
53.9 mm (2.1 in)
1910
80.5 mm (3.2 in)
1911
48.8 mm (1.9 in)
1912
45.6 mm (1.8 in)
1913
31.8 mm (1.3 in)
1914
97.8 mm (3.9 in)
1915
39.5 mm (1.6 in)
1916
84.9 mm (3.3 in)
1917
40.9 mm (1.6 in)
1918
27.2 mm (1.1 in)
1919
80.6 mm (3.2 in)
1920
34.6 mm (1.4 in)
1921
85.7 mm (3.4 in)
1922
33.0 mm (1.3 in)
1923
71.4 mm (2.8 in)
1924
27.2 mm (1.1 in)
1925
64.1 mm (2.5 in)
1926
35.4 mm (1.4 in)
1927
38.8 mm (1.5 in)
1928
43.1 mm (1.7 in)
1929
88.7 mm (3.5 in)
1930
53.4 mm (2.1 in)
1931
54.9 mm (2.2 in)
1932
43.0 mm (1.7 in)
1933
48.3 mm (1.9 in)
1934
35.1 mm (1.4 in)
1935
77.5 mm (3.1 in)
1936
53.6 mm (2.1 in)
1937
29.3 mm (1.2 in)
1938
52.5 mm (2.1 in)
1939
34.8 mm (1.4 in)
1940
57.8 mm (2.3 in)
1941
45.2 mm (1.8 in)
1942
39.9 mm (1.6 in)
1943
77.2 mm (3.0 in)
1944
40.9 mm (1.6 in)
1945
46.1 mm (1.8 in)
1946
52.6 mm (2.1 in)
1947
21.1 mm (0.8 in)
1948
23.8 mm (0.9 in)
1949
18.6 mm (0.7 in)
1950
59.9 mm (2.4 in)
1951
41.6 mm (1.6 in)
1952
35.0 mm (1.4 in)
1953
77.3 mm (3.0 in)
1954
58.2 mm (2.3 in)
1955
52.4 mm (2.1 in)
1956
21.6 mm (0.9 in)
1957
28.2 mm (1.1 in)
1958
47.2 mm (1.9 in)
1959
86.3 mm (3.4 in)
1960
42.2 mm (1.7 in)
1961
47.7 mm (1.9 in)
1962
72.9 mm (2.9 in)
1963
45.3 mm (1.8 in)
1964
38.1 mm (1.5 in)
1965
33.0 mm (1.3 in)
1966
93.4 mm (3.7 in)
1967
120.8 mm (4.8 in)
1968
48.3 mm (1.9 in)
1969
23.6 mm (0.9 in)
1970
79.2 mm (3.1 in)
1971
56.4 mm (2.2 in)
1972
61.8 mm (2.4 in)
1973
33.3 mm (1.3 in)
1974
52.9 mm (2.1 in)
1975
46.8 mm (1.8 in)
1976
29.0 mm (1.1 in)
1977
57.7 mm (2.3 in)
1978
65.8 mm (2.6 in)
1979
38.7 mm (1.5 in)
1980
69.2 mm (2.7 in)
1981
38.2 mm (1.5 in)
1982
69.5 mm (2.7 in)
1983
186.0 mm (7.3 in)
1984
68.9 mm (2.7 in)
1985
37.4 mm (1.5 in)
1986
41.1 mm (1.6 in)
1987
46.5 mm (1.8 in)
1988
52.0 mm (2.0 in)
1989
33.6 mm (1.3 in)
1990
50.6 mm (2.0 in)
1991
51.1 mm (2.0 in)
1992
55.6 mm (2.2 in)
1993
78.1 mm (3.1 in)
1994
67.0 mm (2.6 in)
1995
61.0 mm (2.4 in)
1996
62.0 mm (2.4 in)
1997
20.3 mm (0.8 in)
1998
64.5 mm (2.5 in)
1999
47.6 mm (1.9 in)
2000
50.1 mm (2.0 in)
2001
28.2 mm (1.1 in)
2002
39.4 mm (1.6 in)
2003
80.5 mm (3.2 in)
2004
28.2 mm (1.1 in)
2005
87.4 mm (3.4 in)
2006
98.7 mm (3.9 in)
2007
90.5 mm (3.6 in)
2008
12.9 mm (0.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Tucson WFO, 1894 to 2008. The record is 149 days in 1972, marked on the chart; the median year is 69 days.
Longest dry spell (CDD) at Tucson WFO by year
Year
Longest dry spell (CDD)
1894
47 days
1895
100 days
1896
75 days
1897
104 days
1898
73 days
1899
58 days
1900
41 days
1901
55 days
1902
97 days
1903
68 days
1904
56 days
1905
39 days
1906
93 days
1907
55 days
1908
51 days
1909
95 days
1910
75 days
1911
69 days
1912
64 days
1913
56 days
1914
61 days
1915
41 days
1916
72 days
1917
100 days
1918
42 days
1919
43 days
1920
49 days
1921
58 days
1922
47 days
1923
60 days
1924
81 days
1925
58 days
1926
46 days
1927
67 days
1928
83 days
1929
84 days
1930
40 days
1931
40 days
1932
69 days
1933
128 days
1934
66 days
1935
75 days
1936
81 days
1937
65 days
1938
46 days
1939
51 days
1940
30 days
1941
65 days
1942
81 days
1943
68 days
1944
49 days
1945
95 days
1946
88 days
1947
101 days
1948
123 days
1949
85 days
1950
114 days
1951
71 days
1952
48 days
1953
88 days
1954
75 days
1955
95 days
1956
76 days
1957
40 days
1958
45 days
1959
64 days
1960
48 days
1961
87 days
1962
105 days
1963
74 days
1964
99 days
1965
79 days
1966
47 days
1967
49 days
1968
59 days
1969
69 days
1970
78 days
1971
92 days
1972
149 days
1973
87 days
1974
103 days
1975
75 days
1976
47 days
1977
53 days
1978
51 days
1979
64 days
1980
70 days
1981
59 days
1982
57 days
1983
86 days
1984
89 days
1985
68 days
1986
72 days
1987
56 days
1988
66 days
1989
104 days
1990
45 days
1991
76 days
1992
79 days
1993
46 days
1994
60 days
1995
95 days
1996
60 days
1997
27 days
1998
93 days
1999
100 days
2000
83 days
2001
31 days
2002
124 days
2003
44 days
2004
97 days
2005
75 days
2006
79 days
2007
72 days
2008
19 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
92 years with a frost
Across 92 years with a frost, the median last spring frost at Tucson WFO falls on 11 March and the median first autumn frost on 23 November, which leaves a median of 252 days between them.
In 1961 to 2006 the median growing season was 302 days. That is 68 days more than in 1895 to 1927.
Fitted over all years, the growing season changes by +8.6 days per decade at this station.
Frost dates and growing season at Tucson WFO
Measure
Median, all years
Earliest period (1895 to 1927)
Recent period (1961 to 2006)
Recent against earliest
Fitted trend
Last spring frost
11 March
27 March
9 February
46 days earlier
-5.8 days per decade
First autumn frost
23 November
14 November
3 December
19 days later
+2.9 days per decade
Growing days
252 days
234 days
302 days
68 days more
+8.6 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
111 years, 1895 to 2007
A day with at least 35.1 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 77.3 mm (3.0 in) of rain is expected about once in 100 years.
Rainfall return levels at Tucson WFO: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
35.1 mm (1.4 in)
5 years
47.5 mm (1.9 in)
10 years
55.2 mm (2.2 in)
25 years
64.5 mm (2.5 in)
50 years
71.1 mm (2.8 in)
100 years
77.3 mm (3.0 in)
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 111 years of values from 1895 to 2007.
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: 105.7 mm (4.2 in) in 1983; 73.2 mm (2.9 in) in 1935; 72.1 mm (2.8 in) in 1962.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Tucson WFO, at 1941. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1941 ran 0.6 C (1.0 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Tucson WFO, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1941
+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 Tucson WFO standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tucson WFO 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.