Record envelope, standing records and threshold days for St Mawgan (UKE00105872), United Kingdom, with 50 years of record.
Key Facts for St Mawgan
St Mawgan (UKE00105872) is a weather station in United Kingdom at 50.44 latitude and -5.00 longitude, 103 m (338 ft) above sea level.
The station reports from 1959 to 2008, 50 years of record.
1,464 records set at St Mawgan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
St Mawgan set a daily record low maximum temperature of 8.8 C (47.8 F) on 1 November 2008.
About the Station
Location: United Kingdom, 50.44 latitude, -5.00 longitude.
Elevation: 103 m (338 ft).
Period of record: 1959 to 2008, 50 years.
Eligible elements: tmax, tmin, prcp.
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 St Mawgan. 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 St Mawgan, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
14.4 C (57.9 F)
-9.0 C (15.8 F)
n/a
n/a
Feb
16.5 C (61.7 F)
-8.5 C (16.7 F)
n/a
n/a
Mar
19.6 C (67.3 F)
-8.5 C (16.7 F)
n/a
n/a
Apr
23.9 C (75.0 F)
-2.1 C (28.2 F)
n/a
n/a
May
26.5 C (79.7 F)
1.0 C (33.8 F)
n/a
n/a
Jun
30.8 C (87.4 F)
2.7 C (36.9 F)
n/a
n/a
Jul
30.8 C (87.4 F)
7.4 C (45.3 F)
n/a
n/a
Aug
31.3 C (88.3 F)
7.2 C (45.0 F)
n/a
n/a
Sep
27.4 C (81.3 F)
4.9 C (40.8 F)
n/a
n/a
Oct
23.6 C (74.5 F)
0.3 C (32.5 F)
n/a
n/a
Nov
16.5 C (61.7 F)
-4.2 C (24.4 F)
n/a
n/a
Dec
16.5 C (61.7 F)
-6.7 C (19.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at St Mawgan still stand. 1963 holds the most, with 60.
Standing records at St Mawgan by the year they were set
Year set
Standing records
1960
19
1961
24
1962
45
1963
60
1964
20
1965
42
1966
12
1967
11
1968
26
1969
37
1970
31
1971
24
1972
38
1973
20
1974
35
1975
22
1976
35
1977
39
1978
47
1979
36
1980
38
1981
33
1982
18
1983
46
1984
25
1985
52
1986
52
1987
32
1988
12
1989
46
1990
38
1991
24
1992
17
1993
29
1994
20
1995
40
1996
26
1997
34
1998
38
1999
17
2000
16
2001
12
2002
19
2003
28
2004
26
2005
27
2006
33
2007
25
2008
18
All-Time Record Progression
2 new records
2 all-time records were set at St Mawgan between 2 August 1995 and 19 July 2006. Each dot is a new record.
When St Mawgan set new all-time records
Date
Kind
Detail
1995-08-02
Record high maximum temperature
Record high maximum temperature 31.3 C (88.3 F)
2006-07-19
Record high minimum temperature
Record high minimum temperature 21.0 C (69.8 F)
Wettest Day of Each Month
Oct: 74.9 mm (2.9 in)
The wettest day on record for each calendar month at St Mawgan. The most was 74.9 mm (2.9 in) on 5 October 1977.
Record daily precipitation for each month at St Mawgan
Month
Record daily precipitation (mm)
Date
Jan
37.9 mm (1.5 in)
19 January 1973
Feb
32.8 mm (1.3 in)
5 February 1996
Mar
60.1 mm (2.4 in)
21 March 1976
Apr
31.5 mm (1.2 in)
1 April 1960
May
41.2 mm (1.6 in)
14 May 2008
Jun
54.8 mm (2.2 in)
5 June 2001
Jul
71.0 mm (2.8 in)
28 July 1969
Aug
50.7 mm (2.0 in)
8 August 1975
Sep
49.2 mm (1.9 in)
13 September 1975
Oct
74.9 mm (2.9 in)
5 October 1977
Nov
43.3 mm (1.7 in)
29 November 1971
Dec
40.8 mm (1.6 in)
18 December 1999
Period of Record Coverage
1959 to 2008
Complete yearUnder 90 percent of days
50 years of record at St Mawgan, 1959 to 2008. 1 years have data for under 90 percent of days and are left out of rankings: 1959.
Cooler than the station meanWarmer than the station mean
One stripe for each of 48 complete years at St Mawgan, 1960 to 2007. Blue stripes are years cooler than the station's own mean of 10.6 C (51.1 F); red stripes are warmer. The coolest year was 1963, at 9.2 C (48.6 F), and the warmest was 2007, at 11.6 C (52.9 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at St Mawgan as warming stripes, 1960 to 2007
Year
Annual mean temperature
Difference from the station mean
1960
10.5 C
-0.11 C
1961
10.8 C
+0.21 C
1962
9.5 C
-1.10 C
1963
9.2 C
-1.35 C
1964
10.2 C
-0.38 C
1965
9.8 C
-0.83 C
1966
10.7 C
+0.11 C
1967
10.4 C
-0.20 C
1968
10.1 C
-0.52 C
1969
10.2 C
-0.44 C
1970
10.3 C
-0.31 C
1971
10.7 C
+0.10 C
1972
9.9 C
-0.70 C
1973
10.5 C
-0.12 C
1974
10.2 C
-0.36 C
1975
10.7 C
+0.13 C
1976
10.6 C
+0.03 C
1977
10.6 C
-0.03 C
1978
10.4 C
-0.19 C
1979
9.8 C
-0.81 C
1980
10.1 C
-0.50 C
1981
10.3 C
-0.32 C
1982
10.7 C
+0.12 C
1983
10.8 C
+0.16 C
1984
10.5 C
-0.07 C
1985
9.9 C
-0.65 C
1986
9.5 C
-1.14 C
1987
10.1 C
-0.50 C
1988
10.7 C
+0.12 C
1989
11.5 C
+0.94 C
1990
11.4 C
+0.84 C
1991
10.3 C
-0.30 C
1992
10.4 C
-0.20 C
1993
10.4 C
-0.24 C
1994
11.0 C
+0.41 C
1995
11.5 C
+0.86 C
1996
10.2 C
-0.42 C
1997
11.4 C
+0.82 C
1998
11.2 C
+0.64 C
1999
11.5 C
+0.86 C
2000
11.0 C
+0.41 C
2001
11.0 C
+0.36 C
2002
11.3 C
+0.73 C
2003
11.4 C
+0.80 C
2004
11.3 C
+0.70 C
2005
11.2 C
+0.65 C
2006
11.4 C
+0.83 C
2007
11.6 C
+1.02 C
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1960 to 2007. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 48 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at St Mawgan
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.2 to 0.4) per decade
0.5 F (0.3 to 0.7) per decade
1960 to 2007
48
Rise
Mean daily maximum
0.2 C (0.1 to 0.3) per decade
0.4 F (0.2 to 0.6) per decade
1960 to 2007
48
Rise
Mean daily minimum
0.3 C (0.2 to 0.4) per decade
0.6 F (0.4 to 0.8) per decade
1960 to 2007
48
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
1959 to 2008
Yearly extremes at St Mawgan: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
31.3 C (88.3 F)
1995
25.6 C (78.1 F)
50
Coldest night (TNn)
-9.0 C (15.8 F)
1987
-4.1 C (24.6 F)
49
Wettest day (Rx1day)
74.9 mm (2.9 in)
1977
34.0 mm (1.3 in)
49
Wettest five days (Rx5day)
95.5 mm (3.8 in)
1971
68.0 mm (2.7 in)
49
Longest dry spell (CDD)
41 days
1976
21 days
49
Hottest day (TXx)
The hottest day of the year at St Mawgan, 1959 to 2008. The record is 31.3 C (88.3 F) in 1995, marked on the chart; the median year is 25.6 C (78.1 F).
Hottest day (TXx) at St Mawgan by year
Year
Hottest day (TXx)
1959
10.6 C (51.1 F)
1960
25.6 C (78.1 F)
1961
26.1 C (79.0 F)
1962
22.1 C (71.8 F)
1963
24.5 C (76.1 F)
1964
22.9 C (73.2 F)
1965
23.0 C (73.4 F)
1966
23.1 C (73.6 F)
1967
26.6 C (79.9 F)
1968
23.9 C (75.0 F)
1969
26.3 C (79.3 F)
1970
24.3 C (75.7 F)
1971
26.1 C (79.0 F)
1972
23.6 C (74.5 F)
1973
27.7 C (81.9 F)
1974
23.6 C (74.5 F)
1975
30.6 C (87.1 F)
1976
30.8 C (87.4 F)
1977
25.6 C (78.1 F)
1978
24.4 C (75.9 F)
1979
23.0 C (73.4 F)
1980
24.0 C (75.2 F)
1981
24.6 C (76.3 F)
1982
25.6 C (78.1 F)
1983
30.8 C (87.4 F)
1984
26.9 C (80.4 F)
1985
29.4 C (84.9 F)
1986
25.6 C (78.1 F)
1987
25.7 C (78.3 F)
1988
24.9 C (76.8 F)
1989
27.6 C (81.7 F)
1990
29.9 C (85.8 F)
1991
26.2 C (79.2 F)
1992
24.9 C (76.8 F)
1993
22.6 C (72.7 F)
1994
26.2 C (79.2 F)
1995
31.3 C (88.3 F)
1996
24.8 C (76.6 F)
1997
25.6 C (78.1 F)
1998
26.3 C (79.3 F)
1999
24.6 C (76.3 F)
2000
24.9 C (76.8 F)
2001
26.3 C (79.3 F)
2002
23.2 C (73.8 F)
2003
28.6 C (83.5 F)
2004
26.0 C (78.8 F)
2005
27.3 C (81.1 F)
2006
29.2 C (84.6 F)
2007
23.1 C (73.6 F)
2008
24.5 C (76.1 F)
Coldest night (TNn)
The coldest night of the year at St Mawgan, 1959 to 2008. The record is -9.0 C (15.8 F) in 1987, marked on the chart; the median year is -4.1 C (24.6 F).
Coldest night (TNn) at St Mawgan by year
Year
Coldest night (TNn)
1959
n/a
1960
-3.9 C (25.0 F)
1961
-4.6 C (23.7 F)
1962
-6.7 C (19.9 F)
1963
-7.8 C (18.0 F)
1964
-4.5 C (23.9 F)
1965
-8.5 C (16.7 F)
1966
-5.4 C (22.3 F)
1967
-4.4 C (24.1 F)
1968
-5.1 C (22.8 F)
1969
-8.5 C (16.7 F)
1970
-3.9 C (25.0 F)
1971
-5.3 C (22.5 F)
1972
-5.0 C (23.0 F)
1973
-3.4 C (25.9 F)
1974
-1.8 C (28.8 F)
1975
-1.9 C (28.6 F)
1976
-5.3 C (22.5 F)
1977
-3.0 C (26.6 F)
1978
-6.3 C (20.7 F)
1979
-8.2 C (17.2 F)
1980
-4.8 C (23.4 F)
1981
-3.2 C (26.2 F)
1982
-3.7 C (25.3 F)
1983
-5.1 C (22.8 F)
1984
-2.1 C (28.2 F)
1985
-6.2 C (20.8 F)
1986
-6.2 C (20.8 F)
1987
-9.0 C (15.8 F)
1988
-2.3 C (27.9 F)
1989
-0.8 C (30.6 F)
1990
-1.2 C (29.8 F)
1991
-7.2 C (19.0 F)
1992
-4.1 C (24.6 F)
1993
-4.2 C (24.4 F)
1994
-4.1 C (24.6 F)
1995
-4.1 C (24.6 F)
1996
-5.1 C (22.8 F)
1997
-6.8 C (19.8 F)
1998
-2.3 C (27.9 F)
1999
-2.4 C (27.7 F)
2000
-1.5 C (29.3 F)
2001
-2.6 C (27.3 F)
2002
-1.3 C (29.7 F)
2003
-2.6 C (27.3 F)
2004
-2.6 C (27.3 F)
2005
-3.8 C (25.2 F)
2006
-2.4 C (27.7 F)
2007
-1.4 C (29.5 F)
2008
-0.1 C (31.8 F)
Wettest day (Rx1day)
The wettest day of the year at St Mawgan, 1959 to 2008. The record is 74.9 mm (2.9 in) in 1977, marked on the chart; the median year is 34.0 mm (1.3 in).
Wettest day (Rx1day) at St Mawgan by year
Year
Wettest day (Rx1day)
1959
n/a
1960
31.5 mm (1.2 in)
1961
31.3 mm (1.2 in)
1962
41.7 mm (1.6 in)
1963
24.7 mm (1.0 in)
1964
25.9 mm (1.0 in)
1965
39.6 mm (1.6 in)
1966
34.9 mm (1.4 in)
1967
40.3 mm (1.6 in)
1968
28.1 mm (1.1 in)
1969
71.0 mm (2.8 in)
1970
25.7 mm (1.0 in)
1971
43.3 mm (1.7 in)
1972
34.7 mm (1.4 in)
1973
37.9 mm (1.5 in)
1974
29.0 mm (1.1 in)
1975
50.7 mm (2.0 in)
1976
60.1 mm (2.4 in)
1977
74.9 mm (2.9 in)
1978
31.4 mm (1.2 in)
1979
35.1 mm (1.4 in)
1980
43.9 mm (1.7 in)
1981
34.0 mm (1.3 in)
1982
28.2 mm (1.1 in)
1983
27.2 mm (1.1 in)
1984
37.8 mm (1.5 in)
1985
28.6 mm (1.1 in)
1986
39.5 mm (1.6 in)
1987
29.7 mm (1.2 in)
1988
40.3 mm (1.6 in)
1989
28.2 mm (1.1 in)
1990
30.1 mm (1.2 in)
1991
25.8 mm (1.0 in)
1992
34.9 mm (1.4 in)
1993
39.3 mm (1.5 in)
1994
28.5 mm (1.1 in)
1995
19.6 mm (0.8 in)
1996
35.2 mm (1.4 in)
1997
29.0 mm (1.1 in)
1998
25.8 mm (1.0 in)
1999
40.8 mm (1.6 in)
2000
49.0 mm (1.9 in)
2001
54.8 mm (2.2 in)
2002
33.6 mm (1.3 in)
2003
35.0 mm (1.4 in)
2004
29.8 mm (1.2 in)
2005
23.2 mm (0.9 in)
2006
22.2 mm (0.9 in)
2007
26.2 mm (1.0 in)
2008
41.2 mm (1.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at St Mawgan, 1959 to 2008. The record is 95.5 mm (3.8 in) in 1971, marked on the chart; the median year is 68.0 mm (2.7 in).
Wettest five days (Rx5day) at St Mawgan by year
Year
Wettest five days (Rx5day)
1959
n/a
1960
87.0 mm (3.4 in)
1961
78.5 mm (3.1 in)
1962
68.1 mm (2.7 in)
1963
69.7 mm (2.7 in)
1964
53.9 mm (2.1 in)
1965
58.2 mm (2.3 in)
1966
80.3 mm (3.2 in)
1967
86.5 mm (3.4 in)
1968
60.2 mm (2.4 in)
1969
77.6 mm (3.1 in)
1970
55.7 mm (2.2 in)
1971
95.5 mm (3.8 in)
1972
71.9 mm (2.8 in)
1973
67.9 mm (2.7 in)
1974
67.8 mm (2.7 in)
1975
75.4 mm (3.0 in)
1976
79.2 mm (3.1 in)
1977
88.8 mm (3.5 in)
1978
54.0 mm (2.1 in)
1979
70.6 mm (2.8 in)
1980
63.0 mm (2.5 in)
1981
67.3 mm (2.6 in)
1982
87.4 mm (3.4 in)
1983
67.8 mm (2.7 in)
1984
58.6 mm (2.3 in)
1985
53.7 mm (2.1 in)
1986
74.2 mm (2.9 in)
1987
83.3 mm (3.3 in)
1988
90.9 mm (3.6 in)
1989
70.1 mm (2.8 in)
1990
68.7 mm (2.7 in)
1991
65.3 mm (2.6 in)
1992
61.7 mm (2.4 in)
1993
80.3 mm (3.2 in)
1994
63.0 mm (2.5 in)
1995
61.4 mm (2.4 in)
1996
76.0 mm (3.0 in)
1997
57.4 mm (2.3 in)
1998
72.0 mm (2.8 in)
1999
75.6 mm (3.0 in)
2000
68.0 mm (2.7 in)
2001
55.6 mm (2.2 in)
2002
84.2 mm (3.3 in)
2003
60.8 mm (2.4 in)
2004
55.2 mm (2.2 in)
2005
50.8 mm (2.0 in)
2006
55.9 mm (2.2 in)
2007
61.4 mm (2.4 in)
2008
66.4 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at St Mawgan, 1959 to 2008. The record is 41 days in 1976, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at St Mawgan by year
Year
Longest dry spell (CDD)
1959
n/a
1960
24 days
1961
18 days
1962
21 days
1963
15 days
1964
17 days
1965
23 days
1966
21 days
1967
22 days
1968
20 days
1969
20 days
1970
24 days
1971
21 days
1972
30 days
1973
18 days
1974
23 days
1975
20 days
1976
41 days
1977
17 days
1978
22 days
1979
13 days
1980
17 days
1981
21 days
1982
25 days
1983
20 days
1984
34 days
1985
28 days
1986
23 days
1987
15 days
1988
18 days
1989
21 days
1990
18 days
1991
27 days
1992
29 days
1993
27 days
1994
15 days
1995
22 days
1996
22 days
1997
29 days
1998
15 days
1999
18 days
2000
18 days
2001
13 days
2002
20 days
2003
24 days
2004
23 days
2005
15 days
2006
24 days
2007
27 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at St Mawgan falls on 21 March and the median first autumn frost on 1 December, which leaves a median of 261 days between them.
Fitted over all years, the growing season changes by +7.6 days per decade at this station.
Frost dates and growing season at St Mawgan
Measure
Median, all years
Earliest period
Recent period (1972 to 2007)
Recent against earliest
Fitted trend
Last spring frost
21 March
n/a
21 March
n/a
-3.1 days per decade
First autumn frost
1 December
n/a
3 December
n/a
+4.5 days per decade
Growing days
261 days
n/a
261 days
n/a
+7.6 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
49 years, 1960 to 2008
A day with at least 33.0 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 79.4 mm (3.1 in) of rain is expected about once in 100 years.
Rainfall return levels at St Mawgan: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
33.0 mm (1.3 in)
5 years
42.4 mm (1.7 in)
10 years
49.7 mm (2.0 in)
25 years
60.3 mm (2.4 in)
50 years
69.3 mm (2.7 in)
Longer than the 49 years of record
100 years
79.4 mm (3.1 in)
Longer than the 49 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, 49 years of values from 1960 to 2008.
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: 74.9 mm (2.9 in) in 1977; 71.0 mm (2.8 in) in 1969; 60.1 mm (2.4 in) in 1976.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for St Mawgan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for St Mawgan 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.