Tucson Magnetic Obsy Weather Records (USC00028800)
Record envelope, standing records and threshold days for Tucson Magnetic Obsy (USC00028800), Arizona, United States, with 83 years of record.
Key Facts for Tucson Magnetic Obsy
Tucson Magnetic Obsy (USC00028800) is a weather station in Arizona, United States at 32.25 latitude and -110.83 longitude, 770 m (2,526 ft) above sea level.
The station reports from 1912 to 1994, 83 years of record.
1,464 records set at Tucson Magnetic Obsy still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Tucson Magnetic Obsy set a daily record precipitation of 28.2 mm (1.1 in) on 20 March 1994.
About the Station
Location: Arizona, United States, 32.25 latitude, -110.83 longitude.
Elevation: 770 m (2,526 ft).
Period of record: 1912 to 1994, 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 Tucson Magnetic Obsy. 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 Magnetic Obsy, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
31.1 C (88.0 F)
-14.4 C (6.1 F)
n/a
n/a
Feb
32.8 C (91.0 F)
-10.0 C (14.0 F)
n/a
n/a
Mar
36.1 C (97.0 F)
-7.8 C (18.0 F)
n/a
n/a
Apr
39.4 C (102.9 F)
-3.9 C (25.0 F)
n/a
n/a
May
42.2 C (108.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
47.8 C (118.0 F)
6.7 C (44.1 F)
n/a
n/a
Jul
45.6 C (114.1 F)
10.6 C (51.1 F)
n/a
n/a
Aug
44.4 C (111.9 F)
13.3 C (55.9 F)
n/a
n/a
Sep
43.3 C (109.9 F)
4.4 C (39.9 F)
n/a
n/a
Oct
40.0 C (104.0 F)
-2.8 C (27.0 F)
n/a
n/a
Nov
33.3 C (91.9 F)
-7.2 C (19.0 F)
n/a
n/a
Dec
31.1 C (88.0 F)
-10.0 C (14.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Tucson Magnetic Obsy still stand. 1989 holds the most, with 39.
Standing records at Tucson Magnetic Obsy by the year they were set
Year set
Standing records
1912
38
1913
27
1914
20
1915
25
1916
18
1934
16
1935
22
1936
31
1937
33
1938
28
1939
23
1940
20
1941
19
1942
11
1943
24
1944
17
1945
18
1946
21
1947
23
1948
35
1949
35
1950
38
1951
28
1952
22
1953
29
1954
15
1955
37
1956
30
1957
23
1959
19
1960
20
1961
14
1962
29
1963
22
1964
31
1965
28
1966
26
1967
22
1968
19
1969
20
1970
20
1971
28
1972
15
1973
24
1974
15
1975
21
1976
17
1977
16
1978
23
1979
31
1980
29
1981
18
1982
11
1983
11
1984
22
1985
17
1986
12
1987
23
1988
10
1989
39
1990
27
1991
28
1992
13
1993
15
1994
3
All-Time Record Progression
2 new records
2 all-time records were set at Tucson Magnetic Obsy between 26 December 1987 and 27 June 1990. Each dot is a new record.
When Tucson Magnetic Obsy set new all-time records
Date
Kind
Detail
1987-12-26
Record low maximum temperature
Record low maximum temperature 2.2 C (36.0 F)
1990-06-27
Record high maximum temperature
Record high maximum temperature 47.8 C (118.0 F)
Wettest Day of Each Month
Jul: 69.3 mm (2.7 in)
The wettest day on record for each calendar month at Tucson Magnetic Obsy. The most was 69.3 mm (2.7 in) on 2 July 1939.
Record daily precipitation for each month at Tucson Magnetic Obsy
Month
Record daily precipitation (mm)
Date
Jan
61.7 mm (2.4 in)
19 January 1916
Feb
35.8 mm (1.4 in)
22 February 1973
Mar
35.6 mm (1.4 in)
10 March 1968
Apr
25.4 mm (1.0 in)
23 April 1942
May
25.7 mm (1.0 in)
28 May 1943
Jun
31.5 mm (1.2 in)
28 June 1938
Jul
69.3 mm (2.7 in)
2 July 1939
Aug
58.9 mm (2.3 in)
13 August 1940
Sep
57.7 mm (2.3 in)
26 September 1976
Oct
65.3 mm (2.6 in)
2 October 1983
Nov
41.7 mm (1.6 in)
25 November 1935
Dec
44.2 mm (1.7 in)
5 December 1992
Period of Record Coverage
1912 to 1994
Complete yearUnder 90 percent of days
65 years of record at Tucson Magnetic Obsy, 1912 to 1994. 3 years have data for under 90 percent of days and are left out of rankings: 1916, 1934, 1994.
Cooler than the station meanWarmer than the station mean
One stripe for each of 62 complete years at Tucson Magnetic Obsy, 1912 to 1993. Blue stripes are years cooler than the station's own mean of 19.3 C (66.8 F); red stripes are warmer. The coolest year was 1912, at 17.9 C (64.2 F), and the warmest was 1989, at 20.9 C (69.5 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Tucson Magnetic Obsy as warming stripes, 1912 to 1993
Year
Annual mean temperature
Difference from the station mean
1912
17.9 C
-1.44 C
1913
18.3 C
-1.02 C
1914
19.6 C
+0.32 C
1915
18.5 C
-0.87 C
1935
19.0 C
-0.32 C
1936
19.5 C
+0.17 C
1937
19.0 C
-0.28 C
1938
19.0 C
-0.31 C
1939
19.6 C
+0.27 C
1940
20.2 C
+0.83 C
1941
18.9 C
-0.41 C
1942
19.3 C
-0.03 C
1943
20.4 C
+1.09 C
1944
18.9 C
-0.44 C
1945
18.9 C
-0.39 C
1946
19.3 C
-0.04 C
1947
19.6 C
+0.23 C
1948
19.5 C
+0.17 C
1949
19.1 C
-0.21 C
1950
19.7 C
+0.33 C
1951
19.1 C
-0.23 C
1952
19.0 C
-0.36 C
1953
18.9 C
-0.40 C
1954
20.2 C
+0.87 C
1955
18.4 C
-0.90 C
1956
19.1 C
-0.27 C
1957
19.2 C
-0.08 C
1959
19.4 C
+0.03 C
1960
18.8 C
-0.52 C
1961
19.4 C
+0.10 C
1962
19.4 C
+0.10 C
1963
19.4 C
+0.10 C
1964
18.0 C
-1.33 C
1965
18.8 C
-0.57 C
1966
18.9 C
-0.41 C
1967
19.2 C
-0.16 C
1968
19.0 C
-0.31 C
1969
19.5 C
+0.17 C
1970
18.8 C
-0.52 C
1971
18.5 C
-0.82 C
1972
19.1 C
-0.21 C
1973
18.9 C
-0.38 C
1974
19.6 C
+0.26 C
1975
18.8 C
-0.48 C
1976
19.6 C
+0.25 C
1977
20.0 C
+0.72 C
1978
19.8 C
+0.48 C
1979
19.3 C
-0.02 C
1980
20.1 C
+0.80 C
1981
20.8 C
+1.44 C
1982
19.3 C
-0.07 C
1983
19.0 C
-0.37 C
1984
19.2 C
-0.13 C
1985
19.5 C
+0.15 C
1986
20.1 C
+0.78 C
1987
19.8 C
+0.48 C
1988
20.1 C
+0.78 C
1989
20.9 C
+1.53 C
1990
19.8 C
+0.47 C
1991
19.6 C
+0.32 C
1992
19.8 C
+0.44 C
1993
19.8 C
+0.49 C
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1912 to 1993. In Fahrenheit: 0.2 F (0.1 to 0.3) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Tucson Magnetic Obsy
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.1 C (0.1 to 0.2) per decade
0.2 F (0.1 to 0.3) per decade
1912 to 1993
62
Rise
Mean daily maximum
0.06 C (-0.01 to 0.14) per decade
0.12 F (-0.02 to 0.24) per decade
1912 to 1993
62
Not clearly different from zero
Mean daily minimum
0.2 C (0.1 to 0.3) per decade
0.3 F (0.2 to 0.5) per decade
1912 to 1993
62
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
1912 to 1994
Yearly extremes at Tucson Magnetic Obsy: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.8 C (118.0 F)
1990
43.3 C (109.9 F)
65
Coldest night (TNn)
-14.4 C (6.1 F)
1913
-6.7 C (19.9 F)
65
Wettest day (Rx1day)
69.3 mm (2.7 in)
1939
33.3 mm (1.3 in)
65
Wettest five days (Rx5day)
185.9 mm (7.3 in)
1983
53.0 mm (2.1 in)
65
Longest dry spell (CDD)
150 days
1972
66 days
65
Hottest day (TXx)
The hottest day of the year at Tucson Magnetic Obsy, 1912 to 1994. The record is 47.8 C (118.0 F) in 1990, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at Tucson Magnetic Obsy by year
Year
Hottest day (TXx)
1912
42.8 C (109.0 F)
1913
42.2 C (108.0 F)
1914
42.2 C (108.0 F)
1915
42.2 C (108.0 F)
1916
42.8 C (109.0 F)
1934
38.9 C (102.0 F)
1935
42.2 C (108.0 F)
1936
45.0 C (113.0 F)
1937
43.9 C (111.0 F)
1938
42.8 C (109.0 F)
1939
42.8 C (109.0 F)
1940
43.3 C (109.9 F)
1941
42.8 C (109.0 F)
1942
43.9 C (111.0 F)
1943
42.2 C (108.0 F)
1944
43.9 C (111.0 F)
1945
43.3 C (109.9 F)
1946
42.8 C (109.0 F)
1947
43.9 C (111.0 F)
1948
42.8 C (109.0 F)
1949
42.2 C (108.0 F)
1950
42.8 C (109.0 F)
1951
42.2 C (108.0 F)
1952
42.8 C (109.0 F)
1953
43.9 C (111.0 F)
1954
42.8 C (109.0 F)
1955
43.3 C (109.9 F)
1956
43.9 C (111.0 F)
1957
43.9 C (111.0 F)
1959
42.2 C (108.0 F)
1960
45.6 C (114.1 F)
1961
43.3 C (109.9 F)
1962
43.9 C (111.0 F)
1963
42.2 C (108.0 F)
1964
42.2 C (108.0 F)
1965
42.8 C (109.0 F)
1966
41.7 C (107.1 F)
1967
41.7 C (107.1 F)
1968
45.0 C (113.0 F)
1969
44.4 C (111.9 F)
1970
45.6 C (114.1 F)
1971
43.9 C (111.0 F)
1972
43.3 C (109.9 F)
1973
43.9 C (111.0 F)
1974
45.6 C (114.1 F)
1975
42.8 C (109.0 F)
1976
43.3 C (109.9 F)
1977
43.3 C (109.9 F)
1978
44.4 C (111.9 F)
1979
45.0 C (113.0 F)
1980
44.4 C (111.9 F)
1981
43.3 C (109.9 F)
1982
42.8 C (109.0 F)
1983
45.6 C (114.1 F)
1984
42.2 C (108.0 F)
1985
44.4 C (111.9 F)
1986
43.3 C (109.9 F)
1987
42.2 C (108.0 F)
1988
43.9 C (111.0 F)
1989
45.6 C (114.1 F)
1990
47.8 C (118.0 F)
1991
43.3 C (109.9 F)
1992
43.9 C (111.0 F)
1993
44.4 C (111.9 F)
1994
30.6 C (87.1 F)
Coldest night (TNn)
The coldest night of the year at Tucson Magnetic Obsy, 1912 to 1994. The record is -14.4 C (6.1 F) in 1913, marked on the chart; the median year is -6.7 C (19.9 F).
Coldest night (TNn) at Tucson Magnetic Obsy by year
Year
Coldest night (TNn)
1912
-7.8 C (18.0 F)
1913
-14.4 C (6.1 F)
1914
-5.0 C (23.0 F)
1915
-7.2 C (19.0 F)
1916
-6.1 C (21.0 F)
1934
-6.1 C (21.0 F)
1935
-6.1 C (21.0 F)
1936
-7.2 C (19.0 F)
1937
-11.1 C (12.0 F)
1938
-6.1 C (21.0 F)
1939
-6.7 C (19.9 F)
1940
-5.6 C (21.9 F)
1941
-5.0 C (23.0 F)
1942
-4.4 C (24.1 F)
1943
-3.9 C (25.0 F)
1944
-6.1 C (21.0 F)
1945
-7.2 C (19.0 F)
1946
-6.7 C (19.9 F)
1947
-6.7 C (19.9 F)
1948
-8.9 C (16.0 F)
1949
-9.4 C (15.1 F)
1950
-9.4 C (15.1 F)
1951
-7.8 C (18.0 F)
1952
-7.2 C (19.0 F)
1953
-10.0 C (14.0 F)
1954
-10.0 C (14.0 F)
1955
-9.4 C (15.1 F)
1956
-7.8 C (18.0 F)
1957
-5.6 C (21.9 F)
1959
-6.7 C (19.9 F)
1960
-9.4 C (15.1 F)
1961
-3.3 C (26.1 F)
1962
-7.2 C (19.0 F)
1963
-6.7 C (19.9 F)
1964
-10.6 C (12.9 F)
1965
-7.2 C (19.0 F)
1966
-8.3 C (17.1 F)
1967
-10.0 C (14.0 F)
1968
-7.8 C (18.0 F)
1969
-6.1 C (21.0 F)
1970
-7.2 C (19.0 F)
1971
-9.4 C (15.1 F)
1972
-6.1 C (21.0 F)
1973
-6.7 C (19.9 F)
1974
-9.4 C (15.1 F)
1975
-6.1 C (21.0 F)
1976
-6.7 C (19.9 F)
1977
-3.9 C (25.0 F)
1978
-8.9 C (16.0 F)
1979
-5.6 C (21.9 F)
1980
-3.3 C (26.1 F)
1981
-5.0 C (23.0 F)
1982
-3.9 C (25.0 F)
1983
-3.9 C (25.0 F)
1984
-4.4 C (24.1 F)
1985
-7.2 C (19.0 F)
1986
-3.3 C (26.1 F)
1987
-6.1 C (21.0 F)
1988
-7.8 C (18.0 F)
1989
-5.6 C (21.9 F)
1990
-6.1 C (21.0 F)
1991
-4.4 C (24.1 F)
1992
-5.0 C (23.0 F)
1993
-3.9 C (25.0 F)
1994
-4.4 C (24.1 F)
Wettest day (Rx1day)
The wettest day of the year at Tucson Magnetic Obsy, 1912 to 1994. The record is 69.3 mm (2.7 in) in 1939, marked on the chart; the median year is 33.3 mm (1.3 in).
Wettest day (Rx1day) at Tucson Magnetic Obsy by year
Year
Wettest day (Rx1day)
1912
24.4 mm (1.0 in)
1913
26.9 mm (1.1 in)
1914
40.9 mm (1.6 in)
1915
48.3 mm (1.9 in)
1916
61.7 mm (2.4 in)
1934
24.9 mm (1.0 in)
1935
41.7 mm (1.6 in)
1936
39.4 mm (1.6 in)
1937
26.2 mm (1.0 in)
1938
31.5 mm (1.2 in)
1939
69.3 mm (2.7 in)
1940
58.9 mm (2.3 in)
1941
30.7 mm (1.2 in)
1942
28.2 mm (1.1 in)
1943
25.7 mm (1.0 in)
1944
32.8 mm (1.3 in)
1945
26.7 mm (1.1 in)
1946
35.1 mm (1.4 in)
1947
33.0 mm (1.3 in)
1948
23.6 mm (0.9 in)
1949
50.3 mm (2.0 in)
1950
29.7 mm (1.2 in)
1951
45.5 mm (1.8 in)
1952
28.4 mm (1.1 in)
1953
14.0 mm (0.6 in)
1954
37.3 mm (1.5 in)
1955
37.3 mm (1.5 in)
1956
17.3 mm (0.7 in)
1957
28.2 mm (1.1 in)
1959
40.4 mm (1.6 in)
1960
26.2 mm (1.0 in)
1961
41.1 mm (1.6 in)
1962
31.8 mm (1.3 in)
1963
30.5 mm (1.2 in)
1964
31.0 mm (1.2 in)
1965
37.3 mm (1.5 in)
1966
39.4 mm (1.6 in)
1967
38.4 mm (1.5 in)
1968
35.6 mm (1.4 in)
1969
19.6 mm (0.8 in)
1970
32.8 mm (1.3 in)
1971
35.1 mm (1.4 in)
1972
33.3 mm (1.3 in)
1973
35.8 mm (1.4 in)
1974
17.8 mm (0.7 in)
1975
15.2 mm (0.6 in)
1976
57.7 mm (2.3 in)
1977
32.8 mm (1.3 in)
1978
39.6 mm (1.6 in)
1979
59.9 mm (2.4 in)
1980
24.1 mm (0.9 in)
1981
21.1 mm (0.8 in)
1982
56.9 mm (2.2 in)
1983
65.3 mm (2.6 in)
1984
40.1 mm (1.6 in)
1985
17.0 mm (0.7 in)
1986
38.4 mm (1.5 in)
1987
33.3 mm (1.3 in)
1988
35.1 mm (1.4 in)
1989
37.3 mm (1.5 in)
1990
51.3 mm (2.0 in)
1991
28.7 mm (1.1 in)
1992
44.2 mm (1.7 in)
1993
45.5 mm (1.8 in)
1994
32.8 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Tucson Magnetic Obsy, 1912 to 1994. The record is 185.9 mm (7.3 in) in 1983, marked on the chart; the median year is 53.0 mm (2.1 in).
Wettest five days (Rx5day) at Tucson Magnetic Obsy by year
Year
Wettest five days (Rx5day)
1912
44.0 mm (1.7 in)
1913
62.5 mm (2.5 in)
1914
90.4 mm (3.6 in)
1915
59.0 mm (2.3 in)
1916
89.1 mm (3.5 in)
1934
38.1 mm (1.5 in)
1935
46.5 mm (1.8 in)
1936
47.8 mm (1.9 in)
1937
44.0 mm (1.7 in)
1938
35.1 mm (1.4 in)
1939
73.6 mm (2.9 in)
1940
39.7 mm (1.6 in)
1941
54.1 mm (2.1 in)
1942
40.7 mm (1.6 in)
1943
31.7 mm (1.2 in)
1944
56.9 mm (2.2 in)
1945
34.8 mm (1.4 in)
1946
50.2 mm (2.0 in)
1947
33.0 mm (1.3 in)
1948
32.5 mm (1.3 in)
1949
51.4 mm (2.0 in)
1950
37.3 mm (1.5 in)
1951
52.9 mm (2.1 in)
1952
59.1 mm (2.3 in)
1953
32.8 mm (1.3 in)
1954
70.5 mm (2.8 in)
1955
58.4 mm (2.3 in)
1956
20.3 mm (0.8 in)
1957
52.8 mm (2.1 in)
1959
64.2 mm (2.5 in)
1960
46.6 mm (1.8 in)
1961
60.7 mm (2.4 in)
1962
53.0 mm (2.1 in)
1963
51.3 mm (2.0 in)
1964
71.6 mm (2.8 in)
1965
68.8 mm (2.7 in)
1966
94.0 mm (3.7 in)
1967
75.1 mm (3.0 in)
1968
47.5 mm (1.9 in)
1969
24.6 mm (1.0 in)
1970
53.1 mm (2.1 in)
1971
54.9 mm (2.2 in)
1972
77.5 mm (3.1 in)
1973
41.9 mm (1.6 in)
1974
35.1 mm (1.4 in)
1975
35.2 mm (1.4 in)
1976
80.1 mm (3.2 in)
1977
48.0 mm (1.9 in)
1978
53.8 mm (2.1 in)
1979
64.3 mm (2.5 in)
1980
55.2 mm (2.2 in)
1981
52.4 mm (2.1 in)
1982
86.1 mm (3.4 in)
1983
185.9 mm (7.3 in)
1984
66.3 mm (2.6 in)
1985
33.2 mm (1.3 in)
1986
55.2 mm (2.2 in)
1987
54.2 mm (2.1 in)
1988
58.8 mm (2.3 in)
1989
38.1 mm (1.5 in)
1990
92.0 mm (3.6 in)
1991
32.8 mm (1.3 in)
1992
72.3 mm (2.8 in)
1993
80.3 mm (3.2 in)
1994
38.4 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Tucson Magnetic Obsy, 1912 to 1994. The record is 150 days in 1972, marked on the chart; the median year is 66 days.
Longest dry spell (CDD) at Tucson Magnetic Obsy by year
Year
Longest dry spell (CDD)
1912
64 days
1913
75 days
1914
61 days
1915
34 days
1916
67 days
1934
22 days
1935
43 days
1936
81 days
1937
59 days
1938
74 days
1939
88 days
1940
34 days
1941
66 days
1942
82 days
1943
48 days
1944
49 days
1945
86 days
1946
94 days
1947
92 days
1948
122 days
1949
85 days
1950
89 days
1951
71 days
1952
46 days
1953
90 days
1954
76 days
1955
95 days
1956
89 days
1957
73 days
1959
67 days
1960
81 days
1961
108 days
1962
106 days
1963
75 days
1964
99 days
1965
54 days
1966
47 days
1967
53 days
1968
65 days
1969
56 days
1970
79 days
1971
74 days
1972
150 days
1973
69 days
1974
83 days
1975
75 days
1976
42 days
1977
46 days
1978
51 days
1979
37 days
1980
51 days
1981
57 days
1982
51 days
1983
39 days
1984
89 days
1985
69 days
1986
36 days
1987
42 days
1988
58 days
1989
52 days
1990
45 days
1991
65 days
1992
39 days
1993
47 days
1994
38 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
62 years with a frost
Across 62 years with a frost, the median last spring frost at Tucson Magnetic Obsy falls on 27 March and the median first autumn frost on 16 November, which leaves a median of 231 days between them.
In 1964 to 1993 the median growing season was 234 days. That is 6 days more than in 1912 to 1961.
Fitted over all years, the growing season changes by +2.8 days per decade at this station.
Frost dates and growing season at Tucson Magnetic Obsy
Measure
Median, all years
Earliest period (1912 to 1961)
Recent period (1964 to 1993)
Recent against earliest
Fitted trend
Last spring frost
27 March
27 March
27 March
no change
-2.2 days per decade
First autumn frost
16 November
12 November
19 November
7 days later
+0.6 days per decade
Growing days
231 days
228 days
234 days
6 days more
+2.8 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
62 years, 1912 to 1993
A day with at least 34.0 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 70.2 mm (2.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Tucson Magnetic Obsy: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.0 mm (1.3 in)
5 years
44.8 mm (1.8 in)
10 years
51.5 mm (2.0 in)
25 years
59.4 mm (2.3 in)
50 years
65.0 mm (2.6 in)
100 years
70.2 mm (2.8 in)
Longer than the 62 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, 62 years of values from 1912 to 1993.
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: 69.3 mm (2.7 in) in 1939; 65.3 mm (2.6 in) in 1983; 59.9 mm (2.4 in) in 1979.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Tucson Magnetic Obsy, at 1983. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1983 ran 0.3 C (0.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at Tucson Magnetic Obsy, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1983
-0.2
-0.4
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 Tucson Magnetic Obsy standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tucson Magnetic Obsy 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.