Record envelope, standing records and threshold days for Tropic (USC00428847), Utah, United States, with 107 years of record.
Key Facts for Tropic
Tropic (USC00428847) is a weather station in Utah, United States at 37.63 latitude and -112.08 longitude, 1,914 m (6,280 ft) above sea level.
The station reports from 1893 to 1999, 107 years of record.
1,464 records set at Tropic still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Tropic tied a daily record high maximum temperature of 32.2 C (90.0 F) on 26 August 1999.
About the Station
Location: Utah, United States, 37.63 latitude, -112.08 longitude.
Elevation: 1,914 m (6,280 ft).
Period of record: 1893 to 1999, 107 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 Tropic. 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 Tropic, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
19.4 C (66.9 F)
-27.2 C (-17.0 F)
n/a
n/a
Feb
21.7 C (71.1 F)
-32.2 C (-26.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-18.9 C (-2.0 F)
n/a
n/a
Apr
28.9 C (84.0 F)
-14.4 C (6.1 F)
n/a
n/a
May
35.6 C (96.1 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
41.1 C (106.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
38.3 C (100.9 F)
-8.3 C (17.1 F)
n/a
n/a
Aug
38.3 C (100.9 F)
-5.0 C (23.0 F)
n/a
n/a
Sep
37.8 C (100.0 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-12.8 C (9.0 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-22.8 C (-9.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Tropic still stand. 1902 holds the most, with 99.
Standing records at Tropic by the year they were set
Year set
Standing records
1893
19
1894
25
1897
10
1898
14
1899
22
1900
19
1901
29
1902
99
1903
25
1904
15
1905
11
1906
14
1907
13
1908
10
1909
23
1910
24
1911
12
1912
9
1913
30
1914
9
1915
11
1916
13
1917
36
1918
18
1919
1
1920
20
1921
9
1922
25
1923
17
1924
7
1925
6
1926
1
1927
7
1928
2
1935
7
1936
24
1937
47
1938
15
1939
18
1940
19
1941
27
1942
9
1943
15
1944
6
1945
8
1946
6
1947
21
1948
10
1949
19
1950
9
1951
8
1952
14
1953
16
1954
17
1955
16
1956
6
1957
12
1958
9
1959
16
1960
10
1961
10
1962
20
1963
37
1964
10
1965
11
1966
4
1967
10
1968
10
1969
6
1970
11
1971
31
1972
26
1973
6
1974
1
1975
27
1976
8
1977
9
1978
10
1979
16
1980
14
1981
9
1982
5
1983
9
1984
6
1985
10
1986
13
1987
3
1988
12
1989
14
1990
15
1991
10
1992
5
1993
1
1994
10
1995
16
1996
40
1997
7
1998
8
1999
5
All-Time Record Progression
1 new records
1 all-time records were set at Tropic between 3 July 1963 and 3 July 1963. Each dot is a new record.
When Tropic set new all-time records
Date
Kind
Detail
1963-07-03
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
Wettest Day of Each Month
Sep: 68.6 mm (2.7 in)
The wettest day on record for each calendar month at Tropic. The most was 68.6 mm (2.7 in) on 12 September 1927.
Record daily precipitation for each month at Tropic
Month
Record daily precipitation (mm)
Date
Jan
39.1 mm (1.5 in)
29 January 1915
Feb
45.7 mm (1.8 in)
17 February 1917
Mar
64.3 mm (2.5 in)
3 March 1938
Apr
30.2 mm (1.2 in)
27 April 1900
May
23.9 mm (0.9 in)
11 May 1947
Jun
36.3 mm (1.4 in)
3 June 1952
Jul
48.8 mm (1.9 in)
26 July 1906
Aug
52.8 mm (2.1 in)
13 August 1906
Sep
68.6 mm (2.7 in)
12 September 1927
Oct
55.1 mm (2.2 in)
28 October 1912
Nov
39.9 mm (1.6 in)
10 November 1902
Dec
53.6 mm (2.1 in)
28 December 1936
Period of Record Coverage
1893 to 1999
Complete yearUnder 90 percent of days
99 years of record at Tropic, 1893 to 1999. 37 years have data for under 90 percent of days and are left out of rankings: 1894, 1897, 1898, 1899, 1901, 1902, 1903, 1908 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Tropic, 1893 to 1997. Blue stripes are years cooler than the station's own mean of 8.6 C (47.5 F); red stripes are warmer. The coolest year was 1975, at 6.8 C (44.3 F), and the warmest was 1996, at 10.4 C (50.6 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Tropic as warming stripes, 1893 to 1997
Year
Annual mean temperature
Difference from the station mean
1893
8.2 C
-0.40 C
1904
9.1 C
+0.48 C
1906
9.0 C
+0.41 C
1909
8.2 C
-0.39 C
1913
6.9 C
-1.74 C
1914
8.2 C
-0.47 C
1915
7.6 C
-1.01 C
1936
9.6 C
+1.01 C
1938
9.2 C
+0.57 C
1939
9.8 C
+1.17 C
1940
9.9 C
+1.28 C
1942
8.7 C
+0.06 C
1943
9.4 C
+0.79 C
1944
8.1 C
-0.51 C
1945
8.6 C
-0.07 C
1946
8.9 C
+0.24 C
1947
9.4 C
+0.77 C
1948
8.3 C
-0.34 C
1949
8.3 C
-0.29 C
1952
8.1 C
-0.50 C
1953
9.3 C
+0.71 C
1954
9.9 C
+1.23 C
1955
8.0 C
-0.63 C
1956
9.4 C
+0.72 C
1957
8.6 C
0.00 C
1958
9.5 C
+0.91 C
1959
9.8 C
+1.20 C
1960
9.3 C
+0.62 C
1968
7.6 C
-0.99 C
1969
8.5 C
-0.15 C
1970
8.5 C
-0.15 C
1971
7.8 C
-0.84 C
1973
7.3 C
-1.34 C
1974
8.1 C
-0.55 C
1975
6.8 C
-1.81 C
1976
8.1 C
-0.51 C
1977
8.7 C
+0.05 C
1978
8.0 C
-0.61 C
1979
7.3 C
-1.29 C
1980
8.5 C
-0.15 C
1981
9.4 C
+0.73 C
1982
7.6 C
-1.04 C
1983
8.1 C
-0.55 C
1984
8.1 C
-0.53 C
1985
8.4 C
-0.25 C
1986
9.1 C
+0.50 C
1987
8.5 C
-0.14 C
1988
9.2 C
+0.57 C
1989
9.2 C
+0.52 C
1990
8.4 C
-0.24 C
1991
8.1 C
-0.51 C
1992
9.1 C
+0.48 C
1993
8.4 C
-0.24 C
1994
9.4 C
+0.75 C
1996
10.4 C
+1.73 C
1997
9.4 C
+0.77 C
The fitted trend in annual mean temperature here over 1893 to 1997 is 0.01 C (-0.07 to 0.09) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.01 F (-0.13 to 0.15) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Tropic
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.01 C (-0.07 to 0.09) per decade
0.01 F (-0.13 to 0.15) per decade
1893 to 1997
56
Not clearly different from zero
Mean daily maximum
-0.01 C (-0.12 to 0.10) per decade
-0.02 F (-0.21 to 0.17) per decade
1893 to 1997
56
Not clearly different from zero
Mean daily minimum
0.02 C (-0.05 to 0.10) per decade
0.04 F (-0.10 to 0.18) per decade
1893 to 1997
56
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
1893 to 1999
Yearly extremes at Tropic: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
41.1 C (106.0 F)
1898
33.9 C (93.0 F)
99
Coldest night (TNn)
-32.2 C (-26.0 F)
1903
-18.9 C (-2.0 F)
99
Wettest day (Rx1day)
68.6 mm (2.7 in)
1927
28.7 mm (1.1 in)
99
Wettest five days (Rx5day)
123.8 mm (4.9 in)
1909
45.5 mm (1.8 in)
91
Longest dry spell (CDD)
123 days
1904
40 days
97
Hottest day (TXx)
The hottest day of the year at Tropic, 1893 to 1999. The record is 41.1 C (106.0 F) in 1898, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Tropic by year
Year
Hottest day (TXx)
1893
35.0 C (95.0 F)
1894
38.3 C (100.9 F)
1897
30.6 C (87.1 F)
1898
41.1 C (106.0 F)
1899
36.1 C (97.0 F)
1900
36.7 C (98.1 F)
1901
35.0 C (95.0 F)
1902
37.2 C (99.0 F)
1903
32.2 C (90.0 F)
1904
33.9 C (93.0 F)
1905
35.6 C (96.1 F)
1906
32.8 C (91.0 F)
1907
35.6 C (96.1 F)
1908
34.4 C (93.9 F)
1909
38.3 C (100.9 F)
1910
35.6 C (96.1 F)
1911
33.9 C (93.0 F)
1912
32.8 C (91.0 F)
1913
34.4 C (93.9 F)
1914
32.8 C (91.0 F)
1915
31.1 C (88.0 F)
1916
33.3 C (91.9 F)
1917
38.3 C (100.9 F)
1918
31.1 C (88.0 F)
1919
10.0 C (50.0 F)
1920
31.1 C (88.0 F)
1921
21.1 C (70.0 F)
1922
34.4 C (93.9 F)
1923
34.4 C (93.9 F)
1924
21.7 C (71.1 F)
1925
37.8 C (100.0 F)
1926
15.6 C (60.1 F)
1927
32.2 C (90.0 F)
1928
20.6 C (69.1 F)
1935
33.9 C (93.0 F)
1936
37.8 C (100.0 F)
1937
35.0 C (95.0 F)
1938
36.1 C (97.0 F)
1939
36.7 C (98.1 F)
1940
36.1 C (97.0 F)
1941
33.3 C (91.9 F)
1942
33.9 C (93.0 F)
1943
33.9 C (93.0 F)
1944
34.4 C (93.9 F)
1945
32.2 C (90.0 F)
1946
33.9 C (93.0 F)
1947
33.3 C (91.9 F)
1948
33.9 C (93.0 F)
1949
35.0 C (95.0 F)
1950
35.6 C (96.1 F)
1951
32.8 C (91.0 F)
1952
31.7 C (89.1 F)
1953
38.3 C (100.9 F)
1954
37.2 C (99.0 F)
1955
32.8 C (91.0 F)
1956
33.3 C (91.9 F)
1957
33.3 C (91.9 F)
1958
33.9 C (93.0 F)
1959
34.4 C (93.9 F)
1960
35.6 C (96.1 F)
1961
35.0 C (95.0 F)
1962
32.8 C (91.0 F)
1963
36.7 C (98.1 F)
1964
37.8 C (100.0 F)
1965
32.2 C (90.0 F)
1966
32.8 C (91.0 F)
1967
32.2 C (90.0 F)
1968
33.9 C (93.0 F)
1969
33.9 C (93.0 F)
1970
35.6 C (96.1 F)
1971
36.1 C (97.0 F)
1972
35.6 C (96.1 F)
1973
33.3 C (91.9 F)
1974
34.4 C (93.9 F)
1975
31.7 C (89.1 F)
1976
33.9 C (93.0 F)
1977
32.8 C (91.0 F)
1978
33.3 C (91.9 F)
1979
35.0 C (95.0 F)
1980
33.3 C (91.9 F)
1981
33.9 C (93.0 F)
1982
32.2 C (90.0 F)
1983
32.2 C (90.0 F)
1984
32.8 C (91.0 F)
1985
36.7 C (98.1 F)
1986
32.8 C (91.0 F)
1987
32.2 C (90.0 F)
1988
34.4 C (93.9 F)
1989
35.0 C (95.0 F)
1990
34.4 C (93.9 F)
1991
36.1 C (97.0 F)
1992
33.9 C (93.0 F)
1993
34.4 C (93.9 F)
1994
35.0 C (95.0 F)
1995
32.8 C (91.0 F)
1996
37.2 C (99.0 F)
1997
33.9 C (93.0 F)
1998
35.0 C (95.0 F)
1999
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Tropic, 1893 to 1999. The record is -32.2 C (-26.0 F) in 1903, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Tropic by year
Year
Coldest night (TNn)
1893
-17.8 C (0.0 F)
1894
-26.1 C (-15.0 F)
1897
-13.9 C (7.0 F)
1898
-24.4 C (-11.9 F)
1899
-21.7 C (-7.1 F)
1900
-17.8 C (0.0 F)
1901
-24.4 C (-11.9 F)
1902
-27.2 C (-17.0 F)
1903
-32.2 C (-26.0 F)
1904
-17.2 C (1.0 F)
1905
-22.8 C (-9.0 F)
1906
-16.1 C (3.0 F)
1907
-23.3 C (-9.9 F)
1908
-16.7 C (1.9 F)
1909
-26.1 C (-15.0 F)
1910
-25.6 C (-14.1 F)
1911
-20.0 C (-4.0 F)
1912
-22.8 C (-9.0 F)
1913
-24.4 C (-11.9 F)
1914
-21.1 C (-6.0 F)
1915
-19.4 C (-2.9 F)
1916
-25.0 C (-13.0 F)
1917
-20.0 C (-4.0 F)
1918
-15.0 C (5.0 F)
1919
-17.8 C (0.0 F)
1920
-16.1 C (3.0 F)
1921
-17.2 C (1.0 F)
1922
-12.8 C (9.0 F)
1923
-21.7 C (-7.1 F)
1924
-25.6 C (-14.1 F)
1925
-18.3 C (-0.9 F)
1926
-15.0 C (5.0 F)
1927
-21.1 C (-6.0 F)
1928
-12.8 C (9.0 F)
1935
-15.6 C (3.9 F)
1936
-13.3 C (8.1 F)
1937
-26.7 C (-16.1 F)
1938
-14.4 C (6.1 F)
1939
-22.8 C (-9.0 F)
1940
-17.8 C (0.0 F)
1941
-17.2 C (1.0 F)
1942
-22.8 C (-9.0 F)
1943
-16.7 C (1.9 F)
1944
-18.9 C (-2.0 F)
1945
-18.9 C (-2.0 F)
1946
-16.1 C (3.0 F)
1947
-16.7 C (1.9 F)
1948
-22.2 C (-8.0 F)
1949
-23.3 C (-9.9 F)
1950
-22.8 C (-9.0 F)
1951
-18.3 C (-0.9 F)
1952
-18.3 C (-0.9 F)
1953
-16.7 C (1.9 F)
1954
-16.7 C (1.9 F)
1955
-20.0 C (-4.0 F)
1956
-19.4 C (-2.9 F)
1957
-18.3 C (-0.9 F)
1958
-16.1 C (3.0 F)
1959
-16.7 C (1.9 F)
1960
-23.3 C (-9.9 F)
1961
-20.0 C (-4.0 F)
1962
-17.8 C (0.0 F)
1963
-17.8 C (0.0 F)
1964
-20.6 C (-5.1 F)
1965
-16.7 C (1.9 F)
1966
-17.8 C (0.0 F)
1967
-20.6 C (-5.1 F)
1968
-18.9 C (-2.0 F)
1969
-17.8 C (0.0 F)
1970
-18.3 C (-0.9 F)
1971
-22.8 C (-9.0 F)
1972
-24.4 C (-11.9 F)
1973
-22.2 C (-8.0 F)
1974
-19.4 C (-2.9 F)
1975
-21.7 C (-7.1 F)
1976
-25.6 C (-14.1 F)
1977
-18.3 C (-0.9 F)
1978
-20.0 C (-4.0 F)
1979
-25.6 C (-14.1 F)
1980
-14.4 C (6.1 F)
1981
-13.3 C (8.1 F)
1982
-22.2 C (-8.0 F)
1983
-16.7 C (1.9 F)
1984
-19.4 C (-2.9 F)
1985
-23.3 C (-9.9 F)
1986
-15.6 C (3.9 F)
1987
-16.7 C (1.9 F)
1988
-23.9 C (-11.0 F)
1989
-23.9 C (-11.0 F)
1990
-27.8 C (-18.0 F)
1991
-19.4 C (-2.9 F)
1992
-19.4 C (-2.9 F)
1993
-23.3 C (-9.9 F)
1994
-16.1 C (3.0 F)
1995
-16.1 C (3.0 F)
1996
-18.9 C (-2.0 F)
1997
-16.7 C (1.9 F)
1998
-16.1 C (3.0 F)
1999
-12.8 C (9.0 F)
Wettest day (Rx1day)
The wettest day of the year at Tropic, 1893 to 1999. The record is 68.6 mm (2.7 in) in 1927, marked on the chart; the median year is 28.7 mm (1.1 in).
Wettest day (Rx1day) at Tropic by year
Year
Wettest day (Rx1day)
1893
25.4 mm (1.0 in)
1894
25.4 mm (1.0 in)
1897
25.4 mm (1.0 in)
1898
33.0 mm (1.3 in)
1899
13.0 mm (0.5 in)
1900
59.2 mm (2.3 in)
1901
38.1 mm (1.5 in)
1902
39.9 mm (1.6 in)
1903
24.1 mm (0.9 in)
1904
20.3 mm (0.8 in)
1905
33.0 mm (1.3 in)
1906
52.8 mm (2.1 in)
1907
26.2 mm (1.0 in)
1908
21.3 mm (0.8 in)
1909
48.8 mm (1.9 in)
1910
22.9 mm (0.9 in)
1911
32.0 mm (1.3 in)
1912
55.1 mm (2.2 in)
1913
25.4 mm (1.0 in)
1914
41.7 mm (1.6 in)
1915
39.1 mm (1.5 in)
1916
23.9 mm (0.9 in)
1917
45.7 mm (1.8 in)
1918
15.2 mm (0.6 in)
1919
15.2 mm (0.6 in)
1920
19.1 mm (0.8 in)
1921
37.1 mm (1.5 in)
1922
17.8 mm (0.7 in)
1923
25.4 mm (1.0 in)
1924
14.0 mm (0.6 in)
1925
44.5 mm (1.8 in)
1926
8.6 mm (0.34 in)
1927
68.6 mm (2.7 in)
1928
10.2 mm (0.4 in)
1935
38.6 mm (1.5 in)
1936
53.6 mm (2.1 in)
1937
38.4 mm (1.5 in)
1938
64.3 mm (2.5 in)
1939
43.9 mm (1.7 in)
1940
31.8 mm (1.3 in)
1941
25.4 mm (1.0 in)
1942
13.0 mm (0.5 in)
1943
37.8 mm (1.5 in)
1944
25.7 mm (1.0 in)
1945
50.0 mm (2.0 in)
1946
24.9 mm (1.0 in)
1947
36.6 mm (1.4 in)
1948
35.6 mm (1.4 in)
1949
27.7 mm (1.1 in)
1950
13.2 mm (0.5 in)
1951
45.7 mm (1.8 in)
1952
36.3 mm (1.4 in)
1953
17.8 mm (0.7 in)
1954
37.3 mm (1.5 in)
1955
38.1 mm (1.5 in)
1956
14.7 mm (0.6 in)
1957
25.4 mm (1.0 in)
1958
26.2 mm (1.0 in)
1959
29.7 mm (1.2 in)
1960
44.5 mm (1.8 in)
1961
30.2 mm (1.2 in)
1962
35.6 mm (1.4 in)
1963
39.9 mm (1.6 in)
1964
18.3 mm (0.7 in)
1965
31.8 mm (1.3 in)
1966
17.0 mm (0.7 in)
1967
57.2 mm (2.3 in)
1968
19.8 mm (0.8 in)
1969
33.8 mm (1.3 in)
1970
30.5 mm (1.2 in)
1971
22.4 mm (0.9 in)
1972
34.8 mm (1.4 in)
1973
26.4 mm (1.0 in)
1974
25.9 mm (1.0 in)
1975
33.3 mm (1.3 in)
1976
35.3 mm (1.4 in)
1977
23.4 mm (0.9 in)
1978
30.2 mm (1.2 in)
1979
24.6 mm (1.0 in)
1980
34.0 mm (1.3 in)
1981
41.7 mm (1.6 in)
1982
36.6 mm (1.4 in)
1983
22.4 mm (0.9 in)
1984
23.6 mm (0.9 in)
1985
18.8 mm (0.7 in)
1986
28.4 mm (1.1 in)
1987
26.9 mm (1.1 in)
1988
16.3 mm (0.6 in)
1989
21.1 mm (0.8 in)
1990
28.7 mm (1.1 in)
1991
23.6 mm (0.9 in)
1992
29.7 mm (1.2 in)
1993
43.2 mm (1.7 in)
1994
24.1 mm (0.9 in)
1995
26.7 mm (1.1 in)
1996
15.7 mm (0.6 in)
1997
32.5 mm (1.3 in)
1998
35.1 mm (1.4 in)
1999
20.8 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Tropic, 1893 to 1999. The record is 123.8 mm (4.9 in) in 1909, marked on the chart; the median year is 45.5 mm (1.8 in).
Wettest five days (Rx5day) at Tropic by year
Year
Wettest five days (Rx5day)
1893
33.0 mm (1.3 in)
1894
10.2 mm (0.4 in)
1897
16.5 mm (0.6 in)
1898
35.3 mm (1.4 in)
1899
34.1 mm (1.3 in)
1900
85.9 mm (3.4 in)
1901
76.2 mm (3.0 in)
1902
39.9 mm (1.6 in)
1903
43.6 mm (1.7 in)
1904
28.2 mm (1.1 in)
1905
50.8 mm (2.0 in)
1906
67.6 mm (2.7 in)
1907
45.7 mm (1.8 in)
1908
20.3 mm (0.8 in)
1909
123.8 mm (4.9 in)
1910
78.7 mm (3.1 in)
1911
63.5 mm (2.5 in)
1912
10.4 mm (0.4 in)
1913
31.1 mm (1.2 in)
1914
68.6 mm (2.7 in)
1915
21.4 mm (0.8 in)
1916
44.7 mm (1.8 in)
1917
50.8 mm (2.0 in)
1918
n/a
1919
n/a
1920
n/a
1921
n/a
1922
16.2 mm (0.6 in)
1923
19.1 mm (0.8 in)
1924
n/a
1925
n/a
1926
n/a
1927
68.6 mm (2.7 in)
1928
n/a
1935
56.8 mm (2.2 in)
1936
41.1 mm (1.6 in)
1937
52.8 mm (2.1 in)
1938
85.1 mm (3.4 in)
1939
106.1 mm (4.2 in)
1940
35.6 mm (1.4 in)
1941
63.5 mm (2.5 in)
1942
27.0 mm (1.1 in)
1943
44.8 mm (1.8 in)
1944
48.6 mm (1.9 in)
1945
51.1 mm (2.0 in)
1946
46.5 mm (1.8 in)
1947
50.4 mm (2.0 in)
1948
52.1 mm (2.1 in)
1949
72.2 mm (2.8 in)
1950
13.9 mm (0.5 in)
1951
50.8 mm (2.0 in)
1952
36.3 mm (1.4 in)
1953
42.7 mm (1.7 in)
1954
57.1 mm (2.2 in)
1955
50.0 mm (2.0 in)
1956
34.3 mm (1.4 in)
1957
60.2 mm (2.4 in)
1958
44.5 mm (1.8 in)
1959
36.8 mm (1.4 in)
1960
68.1 mm (2.7 in)
1961
57.9 mm (2.3 in)
1962
40.7 mm (1.6 in)
1963
81.3 mm (3.2 in)
1964
20.6 mm (0.8 in)
1965
52.6 mm (2.1 in)
1966
38.6 mm (1.5 in)
1967
89.7 mm (3.5 in)
1968
35.8 mm (1.4 in)
1969
53.4 mm (2.1 in)
1970
47.5 mm (1.9 in)
1971
46.5 mm (1.8 in)
1972
70.2 mm (2.8 in)
1973
36.6 mm (1.4 in)
1974
43.3 mm (1.7 in)
1975
45.5 mm (1.8 in)
1976
76.1 mm (3.0 in)
1977
28.7 mm (1.1 in)
1978
68.0 mm (2.7 in)
1979
43.2 mm (1.7 in)
1980
71.6 mm (2.8 in)
1981
75.8 mm (3.0 in)
1982
52.4 mm (2.1 in)
1983
36.8 mm (1.4 in)
1984
33.0 mm (1.3 in)
1985
39.1 mm (1.5 in)
1986
49.5 mm (1.9 in)
1987
57.5 mm (2.3 in)
1988
44.2 mm (1.7 in)
1989
23.9 mm (0.9 in)
1990
29.0 mm (1.1 in)
1991
40.1 mm (1.6 in)
1992
40.8 mm (1.6 in)
1993
50.8 mm (2.0 in)
1994
27.4 mm (1.1 in)
1995
41.6 mm (1.6 in)
1996
19.2 mm (0.8 in)
1997
50.3 mm (2.0 in)
1998
54.4 mm (2.1 in)
1999
39.3 mm (1.5 in)
Longest dry spell (CDD)
The longest dry spell of the year at Tropic, 1893 to 1999. The record is 123 days in 1904, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at Tropic by year
Year
Longest dry spell (CDD)
1893
56 days
1894
91 days
1897
17 days
1898
79 days
1899
56 days
1900
58 days
1901
67 days
1902
58 days
1903
51 days
1904
123 days
1905
50 days
1906
59 days
1907
69 days
1908
45 days
1909
101 days
1910
26 days
1911
25 days
1912
24 days
1913
13 days
1914
3 days
1915
26 days
1916
49 days
1917
28 days
1918
1 day
1919
n/a
1920
2 days
1921
1 day
1922
18 days
1923
20 days
1924
1 day
1925
1 day
1926
1 day
1927
33 days
1928
n/a
1935
30 days
1936
33 days
1937
63 days
1938
36 days
1939
117 days
1940
34 days
1941
28 days
1942
60 days
1943
27 days
1944
37 days
1945
28 days
1946
54 days
1947
52 days
1948
42 days
1949
37 days
1950
56 days
1951
54 days
1952
54 days
1953
64 days
1954
35 days
1955
70 days
1956
64 days
1957
33 days
1958
61 days
1959
52 days
1960
52 days
1961
33 days
1962
39 days
1963
40 days
1964
56 days
1965
28 days
1966
65 days
1967
56 days
1968
26 days
1969
55 days
1970
32 days
1971
58 days
1972
103 days
1973
72 days
1974
101 days
1975
35 days
1976
46 days
1977
41 days
1978
56 days
1979
77 days
1980
44 days
1981
32 days
1982
34 days
1983
25 days
1984
30 days
1985
31 days
1986
37 days
1987
37 days
1988
41 days
1989
34 days
1990
37 days
1991
54 days
1992
44 days
1993
59 days
1994
26 days
1995
31 days
1996
42 days
1997
33 days
1998
20 days
1999
32 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
56 years with a frost
Across 56 years with a frost, the median last spring frost at Tropic falls on 29 May and the median first autumn frost on 27 September, which leaves a median of 119 days between them.
Fitted over all years, the growing season changes by -1.7 days per decade at this station.
Frost dates and growing season at Tropic
Measure
Median, all years
Earliest period
Recent period (1959 to 1997)
Recent against earliest
Fitted trend
Last spring frost
29 May
n/a
31 May
n/a
+1.5 days per decade
First autumn frost
27 September
n/a
25 September
n/a
-0.3 days per decade
Growing days
119 days
n/a
116 days
n/a
-1.7 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
60 years, 1898 to 1998
A day with at least 29.5 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 61.2 mm (2.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Tropic: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
29.5 mm (1.2 in)
5 years
38.5 mm (1.5 in)
10 years
44.3 mm (1.7 in)
25 years
51.3 mm (2.0 in)
50 years
56.3 mm (2.2 in)
100 years
61.2 mm (2.4 in)
Longer than the 60 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, 60 years of values from 1898 to 1998.
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: 64.3 mm (2.5 in) in 1938; 59.2 mm (2.3 in) in 1900; 52.8 mm (2.1 in) in 1906.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Tropic, at 1992. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1992 ran 0.5 C (0.8 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Tropic, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1992
+0.5
+0.8
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 Tropic standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Tropic 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.