Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Apan (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 Apan (Smn), with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
27.8 C (82.0 F)
-11.1 C (12.0 F)
n/a
n/a
Feb
27.8 C (82.0 F)
-10.0 C (14.0 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-6.7 C (19.9 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-5.0 C (23.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
30.6 C (87.1 F)
0.0 C (32.0 F)
n/a
n/a
Jul
30.0 C (86.0 F)
0.0 C (32.0 F)
n/a
n/a
Aug
30.6 C (87.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
30.6 C (87.1 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-3.3 C (26.1 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-9.4 C (15.1 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-11.1 C (12.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Apan (Smn) still stand. 1956 holds the most, with 258.
Standing records at Apan (Smn) by the year they were set
Year set
Standing records
1954
23
1955
62
1956
258
1957
49
1958
83
1959
92
1960
90
1961
41
1962
27
1963
41
1964
39
1965
41
1966
56
1967
43
1968
32
1969
52
1970
21
1971
38
1972
32
1973
50
1974
31
1975
31
1976
40
1977
28
1978
20
1979
37
1980
20
1981
15
1982
12
1983
28
1984
15
1985
17
Wettest Day of Each Month
Sep: 82.8 mm (3.3 in)
The wettest day on record for each calendar month at Apan (Smn). The most was 82.8 mm (3.3 in) on 29 September 1955.
Record daily precipitation for each month at Apan (Smn)
Month
Record daily precipitation (mm)
Date
Jan
41.9 mm (1.6 in)
10 January 1967
Feb
27.9 mm (1.1 in)
11 February 1979
Mar
27.4 mm (1.1 in)
24 March 1972
Apr
42.4 mm (1.7 in)
24 April 1968
May
53.8 mm (2.1 in)
25 May 1971
Jun
63.0 mm (2.5 in)
3 June 1964
Jul
57.4 mm (2.3 in)
25 July 1966
Aug
48.3 mm (1.9 in)
27 August 1979
Sep
82.8 mm (3.3 in)
29 September 1955
Oct
48.8 mm (1.9 in)
25 October 1959
Nov
17.8 mm (0.7 in)
12 November 1972
Dec
17.3 mm (0.7 in)
26 December 1958
Period of Record Coverage
1954 to 1985
Complete yearUnder 90 percent of days
32 years of record at Apan (Smn), 1954 to 1985. 2 years have data for under 90 percent of days and are left out of rankings: 1954, 1970.
Cooler than the station meanWarmer than the station mean
One stripe for each of 30 complete years at Apan (Smn), 1955 to 1985. Blue stripes are years cooler than the station's own mean of 14.0 C (57.1 F); red stripes are warmer. The coolest year was 1985, at 12.9 C (55.2 F), and the warmest was 1960, at 15.4 C (59.8 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Apan (Smn) as warming stripes, 1955 to 1985
Year
Annual mean temperature
Difference from the station mean
1955
13.8 C
-0.19 C
1956
13.2 C
-0.73 C
1957
14.8 C
+0.81 C
1958
15.1 C
+1.09 C
1959
14.7 C
+0.77 C
1960
15.4 C
+1.48 C
1961
14.5 C
+0.50 C
1962
14.9 C
+0.97 C
1963
14.9 C
+0.97 C
1964
14.7 C
+0.73 C
1965
13.6 C
-0.41 C
1966
13.0 C
-0.99 C
1967
13.2 C
-0.72 C
1968
13.4 C
-0.61 C
1969
14.5 C
+0.55 C
1971
13.6 C
-0.32 C
1972
14.0 C
+0.03 C
1973
13.9 C
-0.07 C
1974
13.6 C
-0.39 C
1975
13.7 C
-0.30 C
1976
13.6 C
-0.32 C
1977
14.0 C
+0.02 C
1978
13.8 C
-0.12 C
1979
13.4 C
-0.56 C
1980
13.8 C
-0.18 C
1981
13.6 C
-0.37 C
1982
13.8 C
-0.17 C
1983
14.0 C
+0.01 C
1984
13.4 C
-0.55 C
1985
12.9 C
-1.06 C
The annual mean temperature here has fallen by 0.4 C (0.1 to 0.6) per decade over 1955 to 1985. In Fahrenheit: 0.7 F (0.2 to 1.1) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Apan (Smn)
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.4 C (-0.6 to -0.1) per decade
-0.7 F (-1.1 to -0.2) per decade
1955 to 1985
30
Fall
Mean daily maximum
-0.4 C (-0.7 to -0.1) per decade
-0.8 F (-1.3 to -0.2) per decade
1955 to 1985
30
Fall
Mean daily minimum
-0.32 C (-0.61 to -0.02) per decade
-0.57 F (-1.10 to -0.03) per decade
1955 to 1985
30
Fall
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
1954 to 1985
Yearly extremes at Apan (Smn): the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
32.8 C (91.0 F)
1956
30.0 C (86.0 F)
32
Coldest night (TNn)
-11.1 C (12.0 F)
1955
-6.1 C (21.0 F)
32
Wettest day (Rx1day)
82.8 mm (3.3 in)
1955
37.8 mm (1.5 in)
32
Wettest five days (Rx5day)
126.8 mm (5.0 in)
1964
73.9 mm (2.9 in)
32
Longest dry spell (CDD)
87 days
1956
49 days
32
Hottest day (TXx)
The hottest day of the year at Apan (Smn), 1954 to 1985. The record is 32.8 C (91.0 F) in 1956, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Apan (Smn) by year
Year
Hottest day (TXx)
1954
28.9 C (84.0 F)
1955
31.7 C (89.1 F)
1956
32.8 C (91.0 F)
1957
30.0 C (86.0 F)
1958
30.6 C (87.1 F)
1959
30.0 C (86.0 F)
1960
30.0 C (86.0 F)
1961
30.6 C (87.1 F)
1962
30.6 C (87.1 F)
1963
30.0 C (86.0 F)
1964
31.7 C (89.1 F)
1965
30.0 C (86.0 F)
1966
30.0 C (86.0 F)
1967
30.6 C (87.1 F)
1968
27.8 C (82.0 F)
1969
30.0 C (86.0 F)
1970
31.1 C (88.0 F)
1971
31.7 C (89.1 F)
1972
30.0 C (86.0 F)
1973
31.1 C (88.0 F)
1974
29.4 C (84.9 F)
1975
31.1 C (88.0 F)
1976
27.8 C (82.0 F)
1977
30.0 C (86.0 F)
1978
31.1 C (88.0 F)
1979
28.3 C (82.9 F)
1980
30.0 C (86.0 F)
1981
29.4 C (84.9 F)
1982
30.0 C (86.0 F)
1983
32.8 C (91.0 F)
1984
30.0 C (86.0 F)
1985
31.1 C (88.0 F)
Coldest night (TNn)
The coldest night of the year at Apan (Smn), 1954 to 1985. The record is -11.1 C (12.0 F) in 1955, marked on the chart; the median year is -6.1 C (21.0 F).
Coldest night (TNn) at Apan (Smn) by year
Year
Coldest night (TNn)
1954
-9.4 C (15.1 F)
1955
-11.1 C (12.0 F)
1956
-11.1 C (12.0 F)
1957
-5.0 C (23.0 F)
1958
-7.2 C (19.0 F)
1959
-5.0 C (23.0 F)
1960
-6.7 C (19.9 F)
1961
-8.3 C (17.1 F)
1962
-6.1 C (21.0 F)
1963
-6.1 C (21.0 F)
1964
-3.9 C (25.0 F)
1965
-5.0 C (23.0 F)
1966
-9.4 C (15.1 F)
1967
-6.7 C (19.9 F)
1968
-6.1 C (21.0 F)
1969
-5.0 C (23.0 F)
1970
-7.2 C (19.0 F)
1971
-5.0 C (23.0 F)
1972
-8.3 C (17.1 F)
1973
-8.3 C (17.1 F)
1974
-9.4 C (15.1 F)
1975
-8.9 C (16.0 F)
1976
-10.0 C (14.0 F)
1977
-4.4 C (24.1 F)
1978
-5.0 C (23.0 F)
1979
-4.4 C (24.1 F)
1980
-6.1 C (21.0 F)
1981
-6.1 C (21.0 F)
1982
-6.7 C (19.9 F)
1983
-5.6 C (21.9 F)
1984
-5.0 C (23.0 F)
1985
-5.6 C (21.9 F)
Wettest day (Rx1day)
The wettest day of the year at Apan (Smn), 1954 to 1985. The record is 82.8 mm (3.3 in) in 1955, marked on the chart; the median year is 37.8 mm (1.5 in).
Wettest day (Rx1day) at Apan (Smn) by year
Year
Wettest day (Rx1day)
1954
32.8 mm (1.3 in)
1955
82.8 mm (3.3 in)
1956
31.0 mm (1.2 in)
1957
36.3 mm (1.4 in)
1958
43.9 mm (1.7 in)
1959
48.8 mm (1.9 in)
1960
37.8 mm (1.5 in)
1961
31.8 mm (1.3 in)
1962
31.0 mm (1.2 in)
1963
22.9 mm (0.9 in)
1964
63.0 mm (2.5 in)
1965
37.8 mm (1.5 in)
1966
57.4 mm (2.3 in)
1967
47.0 mm (1.9 in)
1968
42.4 mm (1.7 in)
1969
27.4 mm (1.1 in)
1970
42.9 mm (1.7 in)
1971
53.8 mm (2.1 in)
1972
36.8 mm (1.4 in)
1973
31.0 mm (1.2 in)
1974
43.9 mm (1.7 in)
1975
34.3 mm (1.4 in)
1976
40.9 mm (1.6 in)
1977
35.8 mm (1.4 in)
1978
39.9 mm (1.6 in)
1979
55.4 mm (2.2 in)
1980
50.8 mm (2.0 in)
1981
40.9 mm (1.6 in)
1982
24.9 mm (1.0 in)
1983
32.3 mm (1.3 in)
1984
31.0 mm (1.2 in)
1985
32.8 mm (1.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Apan (Smn), 1954 to 1985. The record is 126.8 mm (5.0 in) in 1964, marked on the chart; the median year is 73.9 mm (2.9 in).
Wettest five days (Rx5day) at Apan (Smn) by year
Year
Wettest five days (Rx5day)
1954
57.2 mm (2.3 in)
1955
113.6 mm (4.5 in)
1956
73.6 mm (2.9 in)
1957
62.0 mm (2.4 in)
1958
74.6 mm (2.9 in)
1959
121.2 mm (4.8 in)
1960
45.7 mm (1.8 in)
1961
60.0 mm (2.4 in)
1962
75.5 mm (3.0 in)
1963
50.8 mm (2.0 in)
1964
126.8 mm (5.0 in)
1965
56.7 mm (2.2 in)
1966
86.9 mm (3.4 in)
1967
79.8 mm (3.1 in)
1968
102.0 mm (4.0 in)
1969
51.0 mm (2.0 in)
1970
89.2 mm (3.5 in)
1971
62.2 mm (2.4 in)
1972
76.7 mm (3.0 in)
1973
74.2 mm (2.9 in)
1974
95.5 mm (3.8 in)
1975
65.7 mm (2.6 in)
1976
111.9 mm (4.4 in)
1977
53.1 mm (2.1 in)
1978
73.4 mm (2.9 in)
1979
109.7 mm (4.3 in)
1980
72.9 mm (2.9 in)
1981
75.4 mm (3.0 in)
1982
43.5 mm (1.7 in)
1983
76.3 mm (3.0 in)
1984
71.9 mm (2.8 in)
1985
56.9 mm (2.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Apan (Smn), 1954 to 1985. The record is 87 days in 1956, marked on the chart; the median year is 49 days.
Longest dry spell (CDD) at Apan (Smn) by year
Year
Longest dry spell (CDD)
1954
78 days
1955
55 days
1956
87 days
1957
40 days
1958
54 days
1959
34 days
1960
64 days
1961
33 days
1962
47 days
1963
63 days
1964
68 days
1965
50 days
1966
52 days
1967
39 days
1968
42 days
1969
56 days
1970
35 days
1971
26 days
1972
54 days
1973
77 days
1974
36 days
1975
78 days
1976
34 days
1977
48 days
1978
43 days
1979
36 days
1980
31 days
1981
33 days
1982
80 days
1983
67 days
1984
34 days
1985
51 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Apan (Smn) falls on 23 March and the median first autumn frost on 29 October, which leaves a median of 205 days between them.
Fitted over all years, the growing season changes by +10.6 days per decade at this station.
Frost dates and growing season at Apan (Smn)
Measure
Median, all years
Earliest period
Recent period (1955 to 1985)
Recent against earliest
Fitted trend
Last spring frost
23 March
n/a
23 March
n/a
-4.9 days per decade
First autumn frost
29 October
n/a
29 October
n/a
+5.7 days per decade
Growing days
205 days
n/a
205 days
n/a
+10.6 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
30 years, 1955 to 1985
A day with at least 38.0 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 87.2 mm (3.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Apan (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
38.0 mm (1.5 in)
5 years
48.9 mm (1.9 in)
10 years
57.0 mm (2.2 in)
25 years
68.2 mm (2.7 in)
50 years
77.4 mm (3.0 in)
Longer than the 30 years of record
100 years
87.2 mm (3.4 in)
Longer than the 30 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, 30 years of values from 1955 to 1985.
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: 82.8 mm (3.3 in) in 1955; 63.0 mm (2.5 in) in 1964; 57.4 mm (2.3 in) in 1966.
Download the Data
Data for Apan (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Apan (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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.