Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Ascencion (Smn). 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 Ascencion (Smn), with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
35.6 C (96.1 F)
-20.0 C (-4.0 F)
n/a
n/a
Feb
38.9 C (102.0 F)
-17.2 C (1.0 F)
n/a
n/a
Mar
37.8 C (100.0 F)
-9.4 C (15.1 F)
n/a
n/a
Apr
43.9 C (111.0 F)
-8.9 C (16.0 F)
n/a
n/a
May
48.9 C (120.0 F)
-2.8 C (27.0 F)
n/a
n/a
Jun
50.0 C (122.0 F)
0.0 C (32.0 F)
n/a
n/a
Jul
50.0 C (122.0 F)
1.7 C (35.1 F)
n/a
n/a
Aug
50.0 C (122.0 F)
2.8 C (37.0 F)
n/a
n/a
Sep
50.0 C (122.0 F)
0.0 C (32.0 F)
n/a
n/a
Oct
43.9 C (111.0 F)
-6.1 C (21.0 F)
n/a
n/a
Nov
45.6 C (114.1 F)
-15.0 C (5.0 F)
n/a
n/a
Dec
40.0 C (104.0 F)
-20.0 C (-4.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Ascencion (Smn) still stand. 1994 holds the most, with 189.
Standing records at Ascencion (Smn) by the year they were set
Year set
Standing records
1903
10
1904
24
1905
9
1906
23
1907
24
1908
14
1909
12
1910
25
1911
9
1967
30
1968
28
1969
25
1970
28
1971
23
1972
23
1973
91
1974
33
1975
14
1976
27
1977
43
1978
25
1979
29
1980
24
1981
18
1982
18
1985
12
1986
21
1987
24
1988
14
1989
22
1990
22
1991
14
1992
13
1993
69
1994
189
1995
182
1996
111
1997
16
1998
7
1999
21
2003
98
Wettest Day of Each Month
Sep: 89.9 mm (3.5 in)
The wettest day on record for each calendar month at Ascencion (Smn). The most was 89.9 mm (3.5 in) on 14 September 1949.
Record daily precipitation for each month at Ascencion (Smn)
Month
Record daily precipitation (mm)
Date
Jan
30.0 mm (1.2 in)
5 January 1949
Feb
32.8 mm (1.3 in)
5 February 1997
Mar
24.9 mm (1.0 in)
20 March 2003
Apr
15.7 mm (0.6 in)
26 April 1985
May
24.9 mm (1.0 in)
4 May 1973
Jun
19.8 mm (0.8 in)
2 June 1952
Jul
59.9 mm (2.4 in)
29 July 1953
Aug
87.4 mm (3.4 in)
10 August 1909
Sep
89.9 mm (3.5 in)
14 September 1949
Oct
71.9 mm (2.8 in)
2 October 1950
Nov
27.9 mm (1.1 in)
10 November 1997
Dec
29.0 mm (1.1 in)
1 December 1982
Period of Record Coverage
1963 to 2003
Complete yearUnder 90 percent of days
34 years of record at Ascencion (Smn), 1963 to 2003. 10 years have data for under 90 percent of days and are left out of rankings: 1963, 1975, 1981, 1982, 1983, 1985, 1987, 1994 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 20 complete years at Ascencion (Smn), 1968 to 2003. Blue stripes are years cooler than the station's own mean of 16.3 C (61.4 F); red stripes are warmer. The coolest year was 1973, at 13.0 C (55.5 F), and the warmest was 1996, at 19.7 C (67.5 F). The strongest colour marks a difference of 3.5 C (6.3 F).
Annual mean temperature at Ascencion (Smn) as warming stripes, 1968 to 2003
Year
Annual mean temperature
Difference from the station mean
1968
16.0 C
-0.36 C
1969
16.4 C
+0.05 C
1970
16.1 C
-0.19 C
1971
15.9 C
-0.41 C
1972
15.8 C
-0.48 C
1973
13.0 C
-3.27 C
1974
15.3 C
-1.06 C
1976
14.9 C
-1.38 C
1977
15.5 C
-0.84 C
1978
15.9 C
-0.38 C
1979
15.4 C
-0.88 C
1980
16.7 C
+0.34 C
1986
16.6 C
+0.27 C
1989
17.7 C
+1.34 C
1990
17.2 C
+0.91 C
1991
16.3 C
-0.05 C
1992
16.8 C
+0.48 C
1996
19.7 C
+3.43 C
1997
16.9 C
+0.62 C
2003
18.2 C
+1.87 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1903 to 2003
Yearly extremes at Ascencion (Smn): the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
50.0 C (122.0 F)
1994
40.6 C (105.1 F)
34
Coldest night (TNn)
-20.0 C (-4.0 F)
1910
-9.4 C (15.1 F)
43
Wettest day (Rx1day)
89.9 mm (3.5 in)
1949
30.0 mm (1.2 in)
63
Wettest five days (Rx5day)
128.3 mm (5.1 in)
1971
49.5 mm (1.9 in)
63
Longest dry spell (CDD)
342 days
1911
80 days
63
Hottest day (TXx)
The hottest day of the year at Ascencion (Smn), 1903 to 2003. The record is 50.0 C (122.0 F) in 1994, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Ascencion (Smn) by year
Year
Hottest day (TXx)
1903
n/a
1904
n/a
1905
n/a
1906
n/a
1907
n/a
1908
n/a
1909
n/a
1910
n/a
1911
n/a
1912
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
20.6 C (69.1 F)
1964
n/a
1965
n/a
1966
n/a
1967
40.0 C (104.0 F)
1968
40.6 C (105.1 F)
1969
41.7 C (107.1 F)
1970
40.0 C (104.0 F)
1971
38.9 C (102.0 F)
1972
41.7 C (107.1 F)
1973
38.9 C (102.0 F)
1974
42.8 C (109.0 F)
1975
36.7 C (98.1 F)
1976
38.9 C (102.0 F)
1977
40.6 C (105.1 F)
1978
41.7 C (107.1 F)
1979
40.6 C (105.1 F)
1980
41.7 C (107.1 F)
1981
41.7 C (107.1 F)
1982
40.6 C (105.1 F)
1983
22.8 C (73.0 F)
1984
n/a
1985
40.0 C (104.0 F)
1986
38.9 C (102.0 F)
1987
40.0 C (104.0 F)
1988
38.9 C (102.0 F)
1989
45.6 C (114.1 F)
1990
45.6 C (114.1 F)
1991
41.7 C (107.1 F)
1992
40.6 C (105.1 F)
1993
48.9 C (120.0 F)
1994
50.0 C (122.0 F)
1995
50.0 C (122.0 F)
1996
50.0 C (122.0 F)
1997
40.0 C (104.0 F)
1998
40.0 C (104.0 F)
1999
37.8 C (100.0 F)
2003
40.6 C (105.1 F)
Coldest night (TNn)
The coldest night of the year at Ascencion (Smn), 1903 to 2003. The record is -20.0 C (-4.0 F) in 1910, marked on the chart; the median year is -9.4 C (15.1 F).
Coldest night (TNn) at Ascencion (Smn) by year
Year
Coldest night (TNn)
1903
-9.4 C (15.1 F)
1904
-14.4 C (6.1 F)
1905
-8.3 C (17.1 F)
1906
-9.4 C (15.1 F)
1907
-3.3 C (26.1 F)
1908
-9.4 C (15.1 F)
1909
-13.3 C (8.1 F)
1910
-20.0 C (-4.0 F)
1911
-20.0 C (-4.0 F)
1912
n/a
1948
n/a
1949
n/a
1950
n/a
1951
n/a
1952
n/a
1953
n/a
1954
n/a
1955
n/a
1956
n/a
1957
n/a
1958
n/a
1959
n/a
1960
n/a
1961
n/a
1962
n/a
1963
-7.2 C (19.0 F)
1964
n/a
1965
n/a
1966
n/a
1967
-13.3 C (8.1 F)
1968
-8.3 C (17.1 F)
1969
-8.3 C (17.1 F)
1970
-12.2 C (10.0 F)
1971
-17.2 C (1.0 F)
1972
-14.4 C (6.1 F)
1973
-17.2 C (1.0 F)
1974
-17.2 C (1.0 F)
1975
-11.1 C (12.0 F)
1976
-15.0 C (5.0 F)
1977
-10.0 C (14.0 F)
1978
-17.2 C (1.0 F)
1979
-8.3 C (17.1 F)
1980
-9.4 C (15.1 F)
1981
-4.4 C (24.1 F)
1982
-4.4 C (24.1 F)
1983
-10.0 C (14.0 F)
1984
n/a
1985
-9.4 C (15.1 F)
1986
-10.0 C (14.0 F)
1987
-9.4 C (15.1 F)
1988
-13.3 C (8.1 F)
1989
-12.2 C (10.0 F)
1990
-10.0 C (14.0 F)
1991
-9.4 C (15.1 F)
1992
-7.2 C (19.0 F)
1993
-3.3 C (26.1 F)
1994
0.0 C (32.0 F)
1995
0.0 C (32.0 F)
1996
0.0 C (32.0 F)
1997
0.0 C (32.0 F)
1998
0.0 C (32.0 F)
1999
0.0 C (32.0 F)
2003
-3.3 C (26.1 F)
Wettest day (Rx1day)
The wettest day of the year at Ascencion (Smn), 1903 to 2003. The record is 89.9 mm (3.5 in) in 1949, marked on the chart; the median year is 30.0 mm (1.2 in).
Wettest day (Rx1day) at Ascencion (Smn) by year
Year
Wettest day (Rx1day)
1903
19.8 mm (0.8 in)
1904
19.8 mm (0.8 in)
1905
37.3 mm (1.5 in)
1906
33.3 mm (1.3 in)
1907
69.9 mm (2.8 in)
1908
22.9 mm (0.9 in)
1909
87.4 mm (3.4 in)
1910
10.9 mm (0.4 in)
1911
15.5 mm (0.6 in)
1912
0.0 mm (0.00 in)
1948
19.8 mm (0.8 in)
1949
89.9 mm (3.5 in)
1950
71.9 mm (2.8 in)
1951
9.9 mm (0.39 in)
1952
39.9 mm (1.6 in)
1953
59.9 mm (2.4 in)
1954
30.0 mm (1.2 in)
1955
30.0 mm (1.2 in)
1956
17.8 mm (0.7 in)
1957
24.9 mm (1.0 in)
1958
42.9 mm (1.7 in)
1959
24.9 mm (1.0 in)
1960
15.7 mm (0.6 in)
1961
65.8 mm (2.6 in)
1962
19.8 mm (0.8 in)
1963
59.9 mm (2.4 in)
1964
45.0 mm (1.8 in)
1965
31.8 mm (1.3 in)
1966
51.8 mm (2.0 in)
1967
31.8 mm (1.3 in)
1968
51.3 mm (2.0 in)
1969
31.0 mm (1.2 in)
1970
18.8 mm (0.7 in)
1971
52.8 mm (2.1 in)
1972
56.4 mm (2.2 in)
1973
25.4 mm (1.0 in)
1974
19.8 mm (0.8 in)
1975
46.0 mm (1.8 in)
1976
37.3 mm (1.5 in)
1977
50.8 mm (2.0 in)
1978
31.8 mm (1.3 in)
1979
23.4 mm (0.9 in)
1980
22.4 mm (0.9 in)
1981
50.3 mm (2.0 in)
1982
29.0 mm (1.1 in)
1983
19.8 mm (0.8 in)
1984
19.8 mm (0.8 in)
1985
18.8 mm (0.7 in)
1986
30.0 mm (1.2 in)
1987
7.9 mm (0.31 in)
1988
8.9 mm (0.35 in)
1989
30.0 mm (1.2 in)
1990
28.2 mm (1.1 in)
1991
26.2 mm (1.0 in)
1992
24.9 mm (1.0 in)
1993
30.0 mm (1.2 in)
1994
30.0 mm (1.2 in)
1995
5.8 mm (0.23 in)
1996
26.9 mm (1.1 in)
1997
57.9 mm (2.3 in)
1998
19.8 mm (0.8 in)
1999
46.0 mm (1.8 in)
2003
24.9 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Ascencion (Smn), 1903 to 2003. The record is 128.3 mm (5.1 in) in 1971, marked on the chart; the median year is 49.5 mm (1.9 in).
Wettest five days (Rx5day) at Ascencion (Smn) by year
Year
Wettest five days (Rx5day)
1903
23.6 mm (0.9 in)
1904
32.5 mm (1.3 in)
1905
46.0 mm (1.8 in)
1906
50.6 mm (2.0 in)
1907
75.2 mm (3.0 in)
1908
34.6 mm (1.4 in)
1909
114.9 mm (4.5 in)
1910
13.5 mm (0.5 in)
1911
19.8 mm (0.8 in)
1912
0.0 mm (0.00 in)
1948
26.7 mm (1.1 in)
1949
109.7 mm (4.3 in)
1950
77.7 mm (3.1 in)
1951
10.4 mm (0.4 in)
1952
45.7 mm (1.8 in)
1953
78.0 mm (3.1 in)
1954
30.0 mm (1.2 in)
1955
35.1 mm (1.4 in)
1956
31.3 mm (1.2 in)
1957
58.4 mm (2.3 in)
1958
72.7 mm (2.9 in)
1959
54.6 mm (2.1 in)
1960
19.8 mm (0.8 in)
1961
108.2 mm (4.3 in)
1962
51.5 mm (2.0 in)
1963
88.1 mm (3.5 in)
1964
64.8 mm (2.6 in)
1965
44.0 mm (1.7 in)
1966
65.3 mm (2.6 in)
1967
52.2 mm (2.1 in)
1968
58.2 mm (2.3 in)
1969
51.1 mm (2.0 in)
1970
30.2 mm (1.2 in)
1971
128.3 mm (5.1 in)
1972
64.0 mm (2.5 in)
1973
60.2 mm (2.4 in)
1974
35.8 mm (1.4 in)
1975
61.7 mm (2.4 in)
1976
55.6 mm (2.2 in)
1977
78.5 mm (3.1 in)
1978
39.6 mm (1.6 in)
1979
42.2 mm (1.7 in)
1980
24.7 mm (1.0 in)
1981
58.7 mm (2.3 in)
1982
49.5 mm (1.9 in)
1983
36.6 mm (1.4 in)
1984
33.3 mm (1.3 in)
1985
32.6 mm (1.3 in)
1986
58.7 mm (2.3 in)
1987
17.2 mm (0.7 in)
1988
23.4 mm (0.9 in)
1989
65.0 mm (2.6 in)
1990
70.9 mm (2.8 in)
1991
67.7 mm (2.7 in)
1992
67.6 mm (2.7 in)
1993
37.6 mm (1.5 in)
1994
36.9 mm (1.5 in)
1995
5.8 mm (0.23 in)
1996
26.9 mm (1.1 in)
1997
71.5 mm (2.8 in)
1998
30.5 mm (1.2 in)
1999
87.6 mm (3.4 in)
2003
29.7 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Ascencion (Smn), 1903 to 2003. The record is 342 days in 1911, marked on the chart; the median year is 80 days.
Longest dry spell (CDD) at Ascencion (Smn) by year
Year
Longest dry spell (CDD)
1903
95 days
1904
123 days
1905
34 days
1906
32 days
1907
161 days
1908
191 days
1909
93 days
1910
117 days
1911
342 days
1912
60 days
1948
55 days
1949
157 days
1950
124 days
1951
92 days
1952
39 days
1953
184 days
1954
136 days
1955
196 days
1956
119 days
1957
122 days
1958
59 days
1959
74 days
1960
110 days
1961
134 days
1962
49 days
1963
90 days
1964
151 days
1965
95 days
1966
132 days
1967
137 days
1968
45 days
1969
143 days
1970
75 days
1971
83 days
1972
135 days
1973
58 days
1974
69 days
1975
72 days
1976
41 days
1977
56 days
1978
80 days
1979
87 days
1980
52 days
1981
36 days
1982
47 days
1983
46 days
1984
128 days
1985
40 days
1986
62 days
1987
54 days
1988
78 days
1989
62 days
1990
55 days
1991
75 days
1992
44 days
1993
111 days
1994
70 days
1995
31 days
1996
34 days
1997
30 days
1998
81 days
1999
183 days
2003
89 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
20 years with a frost
Across 20 years with a frost, the median last spring frost at Ascencion (Smn) falls on 8 April and the median first autumn frost on 29 October, which leaves a median of 208 days between them.
Frost dates and growing season at Ascencion (Smn)
Measure
Median, all years
Earliest period
Recent period (1968 to 2003)
Recent against earliest
Fitted trend
Last spring frost
8 April
n/a
8 April
n/a
n/a
First autumn frost
29 October
n/a
29 October
n/a
n/a
Growing days
208 days
n/a
208 days
n/a
n/a
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
52 years, 1904 to 2003
A day with at least 30.1 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 106.6 mm (4.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Ascencion (Smn): the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
30.1 mm (1.2 in)
5 years
47.1 mm (1.9 in)
10 years
59.7 mm (2.4 in)
25 years
77.1 mm (3.0 in)
50 years
91.3 mm (3.6 in)
100 years
106.6 mm (4.2 in)
Longer than the 52 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, 52 years of values from 1904 to 2003.
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: 89.9 mm (3.5 in) in 1949; 87.4 mm (3.4 in) in 1909; 71.9 mm (2.8 in) in 1950.
Download the Data
Data for Ascencion (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ascencion (Smn) 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.