Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Simao. The lines show the 2026 daily maximum and minimum. 2 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Simao, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.6 C (81.7 F)
-3.4 C (25.9 F)
25.2 C (77.4 F)
4.2 C (39.6 F)
Feb
29.8 C (85.6 F)
-1.7 C (28.9 F)
26.1 C (79.0 F)
9.0 C (48.2 F)
Mar
33.5 C (92.3 F)
0.2 C (32.4 F)
30.0 C (86.0 F)
8.8 C (47.8 F)
Apr
34.4 C (93.9 F)
3.4 C (38.1 F)
32.2 C (90.0 F)
10.3 C (50.5 F)
May
35.7 C (96.3 F)
8.6 C (47.5 F)
32.3 C (90.1 F)
15.4 C (59.7 F)
Jun
34.3 C (93.7 F)
12.4 C (54.3 F)
31.1 C (88.0 F)
17.2 C (63.0 F)
Jul
31.8 C (89.2 F)
15.0 C (59.0 F)
30.8 C (87.4 F)
17.8 C (64.0 F)
Aug
32.3 C (90.1 F)
13.5 C (56.3 F)
30.5 C (86.9 F)
17.2 C (63.0 F)
Sep
31.0 C (87.8 F)
7.9 C (46.2 F)
n/a
n/a
Oct
30.1 C (86.2 F)
4.9 C (40.8 F)
n/a
n/a
Nov
28.6 C (83.5 F)
2.0 C (35.6 F)
n/a
n/a
Dec
26.8 C (80.2 F)
-2.8 C (27.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Simao still stand. 1951 holds the most, with 134.
Standing records at Simao by the year they were set
Year set
Standing records
1951
134
1952
84
1953
56
1954
21
1955
23
1956
9
1957
17
1958
28
1959
12
1960
14
1961
11
1962
10
1963
7
1964
13
1965
17
1966
15
1967
19
1968
4
1969
9
1970
10
1971
29
1972
11
1973
8
1974
16
1975
26
1976
12
1977
8
1978
9
1979
35
1980
3
1981
12
1982
9
1983
16
1984
10
1985
8
1986
11
1987
14
1988
9
1989
6
1990
10
1991
15
1992
18
1993
1
1994
14
1995
13
1996
11
1997
10
1998
28
1999
29
2000
16
2001
17
2002
19
2003
10
2004
17
2005
27
2006
27
2007
37
2008
19
2009
31
2010
51
2011
26
2012
36
2013
27
2014
13
2015
13
2016
8
2017
12
2018
4
2019
12
2020
64
2021
10
2022
12
2023
17
2024
17
2025
8
All-Time Record Progression
7 new records
7 all-time records were set at Simao between 10 July 1981 and 25 May 2012. Each dot is a new record.
When Simao set new all-time records
Date
Kind
Detail
1981-07-10
Record daily precipitation
Record daily precipitation 149.0 mm (5.9 in)
1983-07-13
Record high minimum temperature
Record high minimum temperature 22.0 C (71.6 F)
2004-07-01
Record high minimum temperature
Record high minimum temperature 22.1 C (71.8 F)
2006-06-18
Record high minimum temperature
Record high minimum temperature 22.2 C (72.0 F)
2007-08-11
Record high minimum temperature
Record high minimum temperature 22.3 C (72.1 F)
2012-05-20
Record high minimum temperature
Record high minimum temperature 22.4 C (72.3 F)
2012-05-25
Record high minimum temperature
Record high minimum temperature 22.5 C (72.5 F)
Wettest Day of Each Month
Jul: 149.0 mm (5.9 in)
The wettest day on record for each calendar month at Simao. The most was 149.0 mm (5.9 in) on 10 July 1981.
Record daily precipitation for each month at Simao
Month
Record daily precipitation (mm)
Date
Jan
71.9 mm (2.8 in)
30 January 2000
Feb
32.8 mm (1.3 in)
7 February 1976
Mar
75.4 mm (3.0 in)
8 March 1973
Apr
49.3 mm (1.9 in)
30 April 2006
May
111.4 mm (4.4 in)
25 May 2002
Jun
113.5 mm (4.5 in)
23 June 1977
Jul
149.0 mm (5.9 in)
10 July 1981
Aug
146.0 mm (5.7 in)
6 August 1982
Sep
84.9 mm (3.3 in)
17 September 2001
Oct
76.2 mm (3.0 in)
31 October 1977
Nov
85.3 mm (3.4 in)
2 November 1965
Dec
70.1 mm (2.8 in)
12 December 2010
Period of Record Coverage
1951 to 2025
Complete yearUnder 90 percent of days
75 years of record at Simao, 1951 to 2025. 7 years have data for under 90 percent of days and are left out of rankings: 2013, 2015, 2016, 2017, 2018, 2019, 2025.
Cooler than the station meanWarmer than the station mean
One stripe for each of 67 complete years at Simao, 1951 to 2024. Blue stripes are years cooler than the station's own mean of 19.5 C (67.2 F); red stripes are warmer. The coolest year was 1951, at 16.8 C (62.2 F), and the warmest was 2020, at 21.3 C (70.3 F). The strongest colour marks a difference of 2.8 C (5.0 F).
Annual mean temperature at Simao as warming stripes, 1951 to 2024
Year
Annual mean temperature
Difference from the station mean
1951
16.8 C
-2.75 C
1952
18.7 C
-0.88 C
1953
19.2 C
-0.32 C
1954
18.9 C
-0.67 C
1955
18.3 C
-1.20 C
1956
18.7 C
-0.83 C
1957
18.7 C
-0.86 C
1958
18.8 C
-0.77 C
1959
18.6 C
-0.91 C
1960
19.1 C
-0.40 C
1961
19.1 C
-0.43 C
1962
18.7 C
-0.87 C
1963
18.8 C
-0.73 C
1964
18.8 C
-0.73 C
1965
18.9 C
-0.68 C
1966
19.4 C
-0.18 C
1967
18.9 C
-0.66 C
1968
18.9 C
-0.62 C
1969
19.1 C
-0.40 C
1970
19.1 C
-0.48 C
1971
18.3 C
-1.25 C
1972
19.2 C
-0.36 C
1973
19.3 C
-0.27 C
1974
18.9 C
-0.69 C
1975
19.0 C
-0.56 C
1976
18.8 C
-0.79 C
1977
19.0 C
-0.56 C
1978
19.3 C
-0.20 C
1979
19.4 C
-0.18 C
1980
19.5 C
-0.02 C
1981
19.5 C
-0.09 C
1982
19.3 C
-0.29 C
1983
19.2 C
-0.39 C
1984
19.5 C
-0.07 C
1985
19.4 C
-0.14 C
1986
19.4 C
-0.12 C
1987
19.8 C
+0.24 C
1988
19.8 C
+0.22 C
1989
19.7 C
+0.18 C
1990
19.6 C
+0.06 C
1991
19.8 C
+0.23 C
1992
19.0 C
-0.57 C
1993
19.4 C
-0.13 C
1994
19.9 C
+0.40 C
1995
19.9 C
+0.34 C
1996
19.8 C
+0.25 C
1997
19.7 C
+0.13 C
1998
20.5 C
+0.93 C
1999
20.3 C
+0.75 C
2000
20.0 C
+0.42 C
2001
20.2 C
+0.62 C
2002
20.1 C
+0.59 C
2003
20.4 C
+0.90 C
2004
19.9 C
+0.32 C
2005
20.5 C
+0.95 C
2006
20.7 C
+1.18 C
2007
20.3 C
+0.76 C
2008
20.2 C
+0.66 C
2009
20.7 C
+1.14 C
2010
21.3 C
+1.73 C
2011
20.4 C
+0.88 C
2012
21.2 C
+1.64 C
2020
21.3 C
+1.74 C
2021
20.5 C
+0.98 C
2022
20.2 C
+0.63 C
2023
21.0 C
+1.49 C
2024
21.2 C
+1.62 C
The annual mean temperature here has risen by 0.4 C (0.3 to 0.4) per decade over 1951 to 2024. In Fahrenheit: 0.7 F (0.6 to 0.7) per decade. The slope is a straight line fitted to 67 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Simao
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.4 C (0.3 to 0.4) per decade
0.7 F (0.6 to 0.7) per decade
1951 to 2024
67
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.5) per decade
1951 to 2024
67
Rise
Mean daily minimum
0.5 C (0.5 to 0.6) per decade
0.9 F (0.8 to 1.0) per decade
1951 to 2024
67
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
1951 to 2025
Yearly extremes at Simao: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.7 C (96.3 F)
1979
32.8 C (91.0 F)
75
Coldest night (TNn)
-3.4 C (25.9 F)
1953
2.7 C (36.9 F)
75
Wettest day (Rx1day)
149.0 mm (5.9 in)
1981
74.1 mm (2.9 in)
75
Wettest five days (Rx5day)
282.7 mm (11.1 in)
1982
151.5 mm (6.0 in)
75
Longest dry spell (CDD)
85 days
1969
41 days
75
Hottest day (TXx)
The hottest day of the year at Simao, 1951 to 2025. The record is 35.7 C (96.3 F) in 1979, marked on the chart; the median year is 32.8 C (91.0 F).
Hottest day (TXx) at Simao by year
Year
Hottest day (TXx)
1951
31.4 C (88.5 F)
1952
34.9 C (94.8 F)
1953
34.4 C (93.9 F)
1954
34.1 C (93.4 F)
1955
33.1 C (91.6 F)
1956
32.3 C (90.1 F)
1957
34.2 C (93.6 F)
1958
34.4 C (93.9 F)
1959
31.7 C (89.1 F)
1960
34.6 C (94.3 F)
1961
33.0 C (91.4 F)
1962
32.0 C (89.6 F)
1963
33.6 C (92.5 F)
1964
32.0 C (89.6 F)
1965
32.4 C (90.3 F)
1966
33.9 C (93.0 F)
1967
31.5 C (88.7 F)
1968
31.2 C (88.2 F)
1969
34.6 C (94.3 F)
1970
32.8 C (91.0 F)
1971
31.5 C (88.7 F)
1972
33.3 C (91.9 F)
1973
32.0 C (89.6 F)
1974
30.4 C (86.7 F)
1975
32.9 C (91.2 F)
1976
30.5 C (86.9 F)
1977
32.5 C (90.5 F)
1978
33.3 C (91.9 F)
1979
35.7 C (96.3 F)
1980
34.3 C (93.7 F)
1981
31.0 C (87.8 F)
1982
32.8 C (91.0 F)
1983
34.0 C (93.2 F)
1984
33.2 C (91.8 F)
1985
32.0 C (89.6 F)
1986
33.5 C (92.3 F)
1987
34.7 C (94.5 F)
1988
32.5 C (90.5 F)
1989
33.7 C (92.7 F)
1990
32.2 C (90.0 F)
1991
32.1 C (89.8 F)
1992
32.8 C (91.0 F)
1993
30.7 C (87.3 F)
1994
32.9 C (91.2 F)
1995
33.2 C (91.8 F)
1996
32.2 C (90.0 F)
1997
34.2 C (93.6 F)
1998
33.5 C (92.3 F)
1999
33.2 C (91.8 F)
2000
30.7 C (87.3 F)
2001
32.3 C (90.1 F)
2002
32.1 C (89.8 F)
2003
32.1 C (89.8 F)
2004
32.9 C (91.2 F)
2005
33.0 C (91.4 F)
2006
33.0 C (91.4 F)
2007
32.6 C (90.7 F)
2008
32.9 C (91.2 F)
2009
32.2 C (90.0 F)
2010
34.5 C (94.1 F)
2011
31.6 C (88.9 F)
2012
34.1 C (93.4 F)
2013
32.7 C (90.9 F)
2014
34.2 C (93.6 F)
2015
31.7 C (89.1 F)
2016
25.3 C (77.5 F)
2017
14.9 C (58.8 F)
2018
29.9 C (85.8 F)
2019
28.6 C (83.5 F)
2020
34.4 C (93.9 F)
2021
34.7 C (94.5 F)
2022
32.0 C (89.6 F)
2023
34.1 C (93.4 F)
2024
33.3 C (91.9 F)
2025
32.3 C (90.1 F)
Coldest night (TNn)
The coldest night of the year at Simao, 1951 to 2025. The record is -3.4 C (25.9 F) in 1953, marked on the chart; the median year is 2.7 C (36.9 F).
Coldest night (TNn) at Simao by year
Year
Coldest night (TNn)
1951
-1.2 C (29.8 F)
1952
-2.8 C (27.0 F)
1953
-3.4 C (25.9 F)
1954
-1.1 C (30.0 F)
1955
-0.6 C (30.9 F)
1956
-0.4 C (31.3 F)
1957
-0.1 C (31.8 F)
1958
0.5 C (32.9 F)
1959
0.3 C (32.5 F)
1960
3.1 C (37.6 F)
1961
1.1 C (34.0 F)
1962
0.1 C (32.2 F)
1963
0.2 C (32.4 F)
1964
-1.7 C (28.9 F)
1965
1.0 C (33.8 F)
1966
3.2 C (37.8 F)
1967
3.0 C (37.4 F)
1968
1.7 C (35.1 F)
1969
0.9 C (33.6 F)
1970
1.3 C (34.3 F)
1971
0.6 C (33.1 F)
1972
2.2 C (36.0 F)
1973
-0.6 C (30.9 F)
1974
-2.5 C (27.5 F)
1975
-0.9 C (30.4 F)
1976
0.4 C (32.7 F)
1977
1.9 C (35.4 F)
1978
1.7 C (35.1 F)
1979
0.9 C (33.6 F)
1980
1.6 C (34.9 F)
1981
3.7 C (38.7 F)
1982
0.5 C (32.9 F)
1983
2.6 C (36.7 F)
1984
4.1 C (39.4 F)
1985
1.2 C (34.2 F)
1986
0.8 C (33.4 F)
1987
4.0 C (39.2 F)
1988
4.3 C (39.7 F)
1989
3.0 C (37.4 F)
1990
3.3 C (37.9 F)
1991
4.4 C (39.9 F)
1992
2.6 C (36.7 F)
1993
1.0 C (33.8 F)
1994
4.5 C (40.1 F)
1995
3.0 C (37.4 F)
1996
2.7 C (36.9 F)
1997
3.1 C (37.6 F)
1998
3.7 C (38.7 F)
1999
-0.3 C (31.5 F)
2000
4.3 C (39.7 F)
2001
3.9 C (39.0 F)
2002
5.0 C (41.0 F)
2003
5.5 C (41.9 F)
2004
4.4 C (39.9 F)
2005
5.9 C (42.6 F)
2006
4.1 C (39.4 F)
2007
6.2 C (43.2 F)
2008
5.2 C (41.4 F)
2009
5.2 C (41.4 F)
2010
5.4 C (41.7 F)
2011
4.6 C (40.3 F)
2012
4.7 C (40.5 F)
2013
1.2 C (34.2 F)
2014
4.8 C (40.6 F)
2015
3.5 C (38.3 F)
2016
2.7 C (36.9 F)
2017
2.4 C (36.3 F)
2018
6.1 C (43.0 F)
2019
2.9 C (37.2 F)
2020
3.8 C (38.8 F)
2021
2.5 C (36.5 F)
2022
5.4 C (41.7 F)
2023
6.2 C (43.2 F)
2024
7.9 C (46.2 F)
2025
4.2 C (39.6 F)
Wettest day (Rx1day)
The wettest day of the year at Simao, 1951 to 2025. The record is 149.0 mm (5.9 in) in 1981, marked on the chart; the median year is 74.1 mm (2.9 in).
Wettest day (Rx1day) at Simao by year
Year
Wettest day (Rx1day)
1951
55.0 mm (2.2 in)
1952
65.0 mm (2.6 in)
1953
93.8 mm (3.7 in)
1954
64.9 mm (2.6 in)
1955
74.1 mm (2.9 in)
1956
71.6 mm (2.8 in)
1957
68.8 mm (2.7 in)
1958
79.0 mm (3.1 in)
1959
61.4 mm (2.4 in)
1960
85.4 mm (3.4 in)
1961
62.7 mm (2.5 in)
1962
59.9 mm (2.4 in)
1963
57.5 mm (2.3 in)
1964
94.9 mm (3.7 in)
1965
85.3 mm (3.4 in)
1966
119.9 mm (4.7 in)
1967
79.7 mm (3.1 in)
1968
113.0 mm (4.4 in)
1969
107.4 mm (4.2 in)
1970
71.6 mm (2.8 in)
1971
67.2 mm (2.6 in)
1972
69.9 mm (2.8 in)
1973
123.9 mm (4.9 in)
1974
78.4 mm (3.1 in)
1975
57.9 mm (2.3 in)
1976
145.1 mm (5.7 in)
1977
113.5 mm (4.5 in)
1978
35.1 mm (1.4 in)
1979
87.1 mm (3.4 in)
1980
43.0 mm (1.7 in)
1981
149.0 mm (5.9 in)
1982
146.0 mm (5.7 in)
1983
68.6 mm (2.7 in)
1984
119.8 mm (4.7 in)
1985
97.3 mm (3.8 in)
1986
78.0 mm (3.1 in)
1987
74.0 mm (2.9 in)
1988
64.5 mm (2.5 in)
1989
72.8 mm (2.9 in)
1990
122.2 mm (4.8 in)
1991
104.6 mm (4.1 in)
1992
69.4 mm (2.7 in)
1993
104.0 mm (4.1 in)
1994
99.6 mm (3.9 in)
1995
52.6 mm (2.1 in)
1996
65.7 mm (2.6 in)
1997
102.7 mm (4.0 in)
1998
126.7 mm (5.0 in)
1999
65.5 mm (2.6 in)
2000
71.9 mm (2.8 in)
2001
84.9 mm (3.3 in)
2002
111.4 mm (4.4 in)
2003
65.5 mm (2.6 in)
2004
63.4 mm (2.5 in)
2005
50.8 mm (2.0 in)
2006
75.2 mm (3.0 in)
2007
60.9 mm (2.4 in)
2008
58.8 mm (2.3 in)
2009
84.8 mm (3.3 in)
2010
70.1 mm (2.8 in)
2011
84.0 mm (3.3 in)
2012
66.6 mm (2.6 in)
2013
81.0 mm (3.2 in)
2014
82.3 mm (3.2 in)
2015
62.0 mm (2.4 in)
2016
62.7 mm (2.5 in)
2017
56.4 mm (2.2 in)
2018
74.4 mm (2.9 in)
2019
45.7 mm (1.8 in)
2020
69.6 mm (2.7 in)
2021
97.3 mm (3.8 in)
2022
75.2 mm (3.0 in)
2023
74.4 mm (2.9 in)
2024
75.7 mm (3.0 in)
2025
49.0 mm (1.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Simao, 1951 to 2025. The record is 282.7 mm (11.1 in) in 1982, marked on the chart; the median year is 151.5 mm (6.0 in).
Wettest five days (Rx5day) at Simao by year
Year
Wettest five days (Rx5day)
1951
118.5 mm (4.7 in)
1952
197.0 mm (7.8 in)
1953
178.6 mm (7.0 in)
1954
127.8 mm (5.0 in)
1955
151.5 mm (6.0 in)
1956
134.3 mm (5.3 in)
1957
154.6 mm (6.1 in)
1958
199.8 mm (7.9 in)
1959
174.4 mm (6.9 in)
1960
214.8 mm (8.5 in)
1961
166.8 mm (6.6 in)
1962
147.3 mm (5.8 in)
1963
108.9 mm (4.3 in)
1964
143.1 mm (5.6 in)
1965
141.5 mm (5.6 in)
1966
196.7 mm (7.7 in)
1967
169.2 mm (6.7 in)
1968
190.5 mm (7.5 in)
1969
187.2 mm (7.4 in)
1970
158.3 mm (6.2 in)
1971
170.2 mm (6.7 in)
1972
164.9 mm (6.5 in)
1973
233.6 mm (9.2 in)
1974
122.0 mm (4.8 in)
1975
172.8 mm (6.8 in)
1976
234.5 mm (9.2 in)
1977
163.1 mm (6.4 in)
1978
73.1 mm (2.9 in)
1979
163.9 mm (6.5 in)
1980
105.3 mm (4.1 in)
1981
183.8 mm (7.2 in)
1982
282.7 mm (11.1 in)
1983
134.0 mm (5.3 in)
1984
240.0 mm (9.4 in)
1985
223.2 mm (8.8 in)
1986
249.5 mm (9.8 in)
1987
110.8 mm (4.4 in)
1988
110.6 mm (4.4 in)
1989
98.7 mm (3.9 in)
1990
180.3 mm (7.1 in)
1991
267.0 mm (10.5 in)
1992
121.3 mm (4.8 in)
1993
137.8 mm (5.4 in)
1994
156.5 mm (6.2 in)
1995
114.0 mm (4.5 in)
1996
132.0 mm (5.2 in)
1997
191.9 mm (7.6 in)
1998
207.7 mm (8.2 in)
1999
152.7 mm (6.0 in)
2000
98.3 mm (3.9 in)
2001
144.1 mm (5.7 in)
2002
141.3 mm (5.6 in)
2003
96.8 mm (3.8 in)
2004
123.0 mm (4.8 in)
2005
120.4 mm (4.7 in)
2006
180.3 mm (7.1 in)
2007
120.5 mm (4.7 in)
2008
108.8 mm (4.3 in)
2009
127.4 mm (5.0 in)
2010
96.5 mm (3.8 in)
2011
141.0 mm (5.6 in)
2012
106.7 mm (4.2 in)
2013
161.5 mm (6.4 in)
2014
220.2 mm (8.7 in)
2015
132.1 mm (5.2 in)
2016
124.7 mm (4.9 in)
2017
111.5 mm (4.4 in)
2018
144.2 mm (5.7 in)
2019
88.9 mm (3.5 in)
2020
159.8 mm (6.3 in)
2021
189.0 mm (7.4 in)
2022
155.5 mm (6.1 in)
2023
109.7 mm (4.3 in)
2024
190.5 mm (7.5 in)
2025
133.3 mm (5.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Simao, 1951 to 2025. The record is 85 days in 1969, marked on the chart; the median year is 41 days.
Longest dry spell (CDD) at Simao by year
Year
Longest dry spell (CDD)
1951
79 days
1952
53 days
1953
37 days
1954
53 days
1955
33 days
1956
48 days
1957
57 days
1958
39 days
1959
35 days
1960
57 days
1961
36 days
1962
55 days
1963
65 days
1964
36 days
1965
35 days
1966
64 days
1967
29 days
1968
43 days
1969
85 days
1970
59 days
1971
31 days
1972
48 days
1973
40 days
1974
77 days
1975
43 days
1976
39 days
1977
37 days
1978
37 days
1979
33 days
1980
47 days
1981
27 days
1982
38 days
1983
38 days
1984
76 days
1985
46 days
1986
46 days
1987
32 days
1988
47 days
1989
65 days
1990
46 days
1991
57 days
1992
33 days
1993
41 days
1994
47 days
1995
48 days
1996
34 days
1997
30 days
1998
43 days
1999
41 days
2000
29 days
2001
54 days
2002
41 days
2003
40 days
2004
38 days
2005
58 days
2006
72 days
2007
46 days
2008
50 days
2009
82 days
2010
37 days
2011
54 days
2012
50 days
2013
4 days
2014
6 days
2015
4 days
2016
3 days
2017
3 days
2018
4 days
2019
32 days
2020
56 days
2021
28 days
2022
24 days
2023
33 days
2024
53 days
2025
26 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.
Rainfall Return Levels
67 years, 1951 to 2024
A day with at least 77.1 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 170.3 mm (6.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Simao: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
77.1 mm (3.0 in)
5 years
99.3 mm (3.9 in)
10 years
115.0 mm (4.5 in)
25 years
136.2 mm (5.4 in)
50 years
152.9 mm (6.0 in)
100 years
170.3 mm (6.7 in)
Longer than the 67 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, 67 years of values from 1951 to 2024.
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: 149.0 mm (5.9 in) in 1981; 146.0 mm (5.7 in) in 1982; 145.1 mm (5.7 in) in 1976.
Climate Twins
2003 to 2024 against 1961 to 1990
Over 2003 to 2024, Simao had a mean temperature of 20.7 C (69.2 F) and 1,342.2 mm (52.8 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Cerro Blanco (Mexico, 14,378 km away), Chicontepec de Tejeda (Dge) (Mexico, 14,728 km away) and Lancang (China, 110 km away).
Climate twins of Simao: stations whose 1961 to 1990 climate is closest to its 2003 to 2024 climate
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Data for Simao standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Simao 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.