Record envelope, standing records and threshold days for May 2SSE (USC00105685), Idaho, United States, with 86 years of record.
Key Facts for May 2SSE
May 2SSE (USC00105685) is a weather station in Idaho, United States at 44.57 latitude and -113.90 longitude, 1,539 m (5,050 ft) above sea level.
The station reports from 1934 to 2019, 86 years of record.
1,464 records set at May 2SSE still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
May 2SSE tied a daily record precipitation of 5.8 mm (0.23 in) on 4 February 2019.
About the Station
Location: Idaho, United States, 44.57 latitude, -113.90 longitude.
Elevation: 1,539 m (5,050 ft).
Period of record: 1934 to 2019, 86 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 May 2SSE. 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 May 2SSE, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
16.1 C (61.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
17.8 C (64.0 F)
-37.2 C (-35.0 F)
n/a
n/a
Mar
25.0 C (77.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Apr
28.3 C (82.9 F)
-16.1 C (3.0 F)
n/a
n/a
May
48.9 C (120.0 F)
-11.1 C (12.0 F)
n/a
n/a
Jun
37.8 C (100.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
41.7 C (107.1 F)
-3.3 C (26.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
-2.8 C (27.0 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-12.2 C (10.0 F)
n/a
n/a
Oct
31.7 C (89.1 F)
-25.6 C (-14.1 F)
n/a
n/a
Nov
23.3 C (73.9 F)
-31.1 C (-24.0 F)
n/a
n/a
Dec
15.0 C (59.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at May 2SSE still stand. 1934 holds the most, with 95.
Standing records at May 2SSE by the year they were set
Year set
Standing records
1934
95
1935
8
1936
32
1937
25
1938
9
1939
29
1940
24
1941
14
1942
33
1943
26
1944
16
1945
16
1946
15
1947
10
1948
29
1949
27
1950
26
1951
24
1952
28
1953
20
1954
24
1955
24
1956
16
1957
12
1958
8
1959
18
1960
24
1961
17
1962
12
1963
17
1964
13
1965
24
1966
23
1967
9
1968
12
1969
20
1970
15
1971
17
1972
30
1973
14
1974
29
1975
13
1976
14
1977
25
1978
26
1979
21
1980
21
1981
18
1982
24
1983
31
1984
14
1985
23
1986
20
1987
23
1988
29
1989
5
2000
8
2001
9
2002
16
2003
22
2004
11
2005
7
2006
7
2007
12
2008
20
2009
15
2010
19
2011
7
2012
17
2013
12
2014
26
2015
22
2016
8
2017
26
2018
9
All-Time Record Progression
2 new records
2 all-time records were set at May 2SSE between 18 November 1985 and 15 January 2017. Each dot is a new record.
When May 2SSE set new all-time records
Date
Kind
Detail
1985-11-18
Record daily snowfall
Record daily snowfall 21.6 cm (8.5 in)
2017-01-15
Record snow depth
Record snow depth 35.6 cm (14.0 in)
Wettest Day of Each Month
Jun: 36.8 mm (1.4 in)
The wettest day on record for each calendar month at May 2SSE. The most was 36.8 mm (1.4 in) on 2 June 1953.
Record daily precipitation for each month at May 2SSE
Month
Record daily precipitation (mm)
Date
Jan
12.7 mm (0.5 in)
27 January 1954
Feb
14.0 mm (0.6 in)
18 February 1986
Mar
27.7 mm (1.1 in)
18 March 2012
Apr
17.8 mm (0.7 in)
5 April 2006
May
30.7 mm (1.2 in)
15 May 1952
Jun
36.8 mm (1.4 in)
2 June 1953
Jul
28.4 mm (1.1 in)
10 July 1983
Aug
21.8 mm (0.9 in)
5 August 1950
Sep
24.1 mm (0.9 in)
17 September 1947
Oct
30.2 mm (1.2 in)
6 October 2006
Nov
27.9 mm (1.1 in)
10 November 1970
Dec
20.8 mm (0.8 in)
23 December 1955
Period of Record Coverage
1934 to 2019
Complete yearUnder 90 percent of days
76 years of record at May 2SSE, 1934 to 2019. 10 years have data for under 90 percent of days and are left out of rankings: 1934, 1935, 1937, 1943, 1962, 1969, 1988, 1989 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 52 complete years at May 2SSE, 1936 to 2016. Blue stripes are years cooler than the station's own mean of 5.9 C (42.6 F); red stripes are warmer. The coolest year was 1955, at 4.3 C (39.8 F), and the warmest was 1981, at 7.4 C (45.4 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at May 2SSE as warming stripes, 1936 to 2016
Year
Annual mean temperature
Difference from the station mean
1936
6.6 C
+0.64 C
1938
5.7 C
-0.26 C
1939
6.6 C
+0.66 C
1940
6.9 C
+0.97 C
1941
6.2 C
+0.25 C
1942
4.5 C
-1.42 C
1944
5.2 C
-0.74 C
1946
6.2 C
+0.25 C
1947
5.9 C
+0.00 C
1948
5.1 C
-0.83 C
1949
5.1 C
-0.84 C
1950
5.5 C
-0.38 C
1951
5.0 C
-0.93 C
1952
4.7 C
-1.21 C
1953
6.6 C
+0.68 C
1954
6.2 C
+0.28 C
1955
4.3 C
-1.58 C
1956
5.3 C
-0.66 C
1957
5.2 C
-0.70 C
1958
5.8 C
-0.15 C
1959
5.8 C
-0.13 C
1961
6.9 C
+0.96 C
1963
6.9 C
+0.93 C
1965
5.8 C
-0.11 C
1966
7.0 C
+1.09 C
1968
5.8 C
-0.09 C
1970
6.5 C
+0.54 C
1971
6.0 C
+0.09 C
1972
6.1 C
+0.16 C
1973
6.7 C
+0.74 C
1974
6.6 C
+0.67 C
1975
5.3 C
-0.65 C
1976
5.7 C
-0.21 C
1977
6.1 C
+0.21 C
1978
6.0 C
+0.10 C
1979
6.5 C
+0.60 C
1980
7.0 C
+1.09 C
1981
7.4 C
+1.51 C
1982
5.2 C
-0.70 C
1983
6.2 C
+0.30 C
1984
4.9 C
-1.04 C
1985
4.4 C
-1.57 C
1986
6.9 C
+1.03 C
1987
7.1 C
+1.16 C
2008
5.5 C
-0.41 C
2009
5.5 C
-0.40 C
2010
5.3 C
-0.61 C
2011
5.1 C
-0.79 C
2012
6.6 C
+0.72 C
2013
5.7 C
-0.21 C
2014
6.7 C
+0.75 C
2016
6.2 C
+0.25 C
The fitted trend in annual mean temperature here over 1936 to 2016 is 0.03 C (-0.06 to 0.13) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.2) per decade. The slope is a straight line fitted to 52 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at May 2SSE
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.03 C (-0.06 to 0.13) per decade
0.1 F (-0.1 to 0.2) per decade
1936 to 2016
52
Not clearly different from zero
Mean daily maximum
0.09 C (-0.03 to 0.21) per decade
0.2 F (-0.1 to 0.4) per decade
1936 to 2016
52
Not clearly different from zero
Mean daily minimum
-0.02 C (-0.12 to 0.07) per decade
-0.04 F (-0.22 to 0.13) per decade
1936 to 2016
52
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
1934 to 2019
Yearly extremes at May 2SSE: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
48.9 C (120.0 F)
1934
35.9 C (96.5 F)
76
Coldest night (TNn)
-40.0 C (-40.0 F)
1937
-28.9 C (-20.0 F)
76
Wettest day (Rx1day)
36.8 mm (1.4 in)
1953
16.4 mm (0.6 in)
76
Wettest five days (Rx5day)
54.6 mm (2.1 in)
1983
27.5 mm (1.1 in)
76
Longest dry spell (CDD)
153 days
1988
40 days
76
Hottest day (TXx)
The hottest day of the year at May 2SSE, 1934 to 2019. The record is 48.9 C (120.0 F) in 1934, marked on the chart; the median year is 35.9 C (96.5 F).
Hottest day (TXx) at May 2SSE by year
Year
Hottest day (TXx)
1934
48.9 C (120.0 F)
1935
33.9 C (93.0 F)
1936
38.3 C (100.9 F)
1937
36.7 C (98.1 F)
1938
33.3 C (91.9 F)
1939
35.6 C (96.1 F)
1940
38.9 C (102.0 F)
1941
33.9 C (93.0 F)
1942
36.1 C (97.0 F)
1943
35.0 C (95.0 F)
1944
32.8 C (91.0 F)
1945
35.0 C (95.0 F)
1946
36.1 C (97.0 F)
1947
33.9 C (93.0 F)
1948
34.4 C (93.9 F)
1949
35.0 C (95.0 F)
1950
34.4 C (93.9 F)
1951
34.4 C (93.9 F)
1952
33.9 C (93.0 F)
1953
33.9 C (93.0 F)
1954
34.4 C (93.9 F)
1955
34.4 C (93.9 F)
1956
33.9 C (93.0 F)
1957
32.8 C (91.0 F)
1958
35.6 C (96.1 F)
1959
36.7 C (98.1 F)
1960
36.7 C (98.1 F)
1961
38.3 C (100.9 F)
1962
33.9 C (93.0 F)
1963
35.6 C (96.1 F)
1964
35.0 C (95.0 F)
1965
34.4 C (93.9 F)
1966
36.7 C (98.1 F)
1967
35.0 C (95.0 F)
1968
35.0 C (95.0 F)
1969
36.7 C (98.1 F)
1970
35.0 C (95.0 F)
1971
36.1 C (97.0 F)
1972
37.2 C (99.0 F)
1973
38.3 C (100.9 F)
1974
36.1 C (97.0 F)
1975
36.7 C (98.1 F)
1976
36.1 C (97.0 F)
1977
34.4 C (93.9 F)
1978
37.2 C (99.0 F)
1979
36.7 C (98.1 F)
1980
36.1 C (97.0 F)
1981
36.7 C (98.1 F)
1982
36.7 C (98.1 F)
1983
37.8 C (100.0 F)
1984
35.6 C (96.1 F)
1985
36.7 C (98.1 F)
1986
35.6 C (96.1 F)
1987
34.4 C (93.9 F)
1988
37.2 C (99.0 F)
1989
26.7 C (80.1 F)
2000
36.1 C (97.0 F)
2001
36.1 C (97.0 F)
2002
38.3 C (100.9 F)
2003
37.8 C (100.0 F)
2004
35.6 C (96.1 F)
2005
36.1 C (97.0 F)
2006
38.3 C (100.9 F)
2007
37.2 C (99.0 F)
2008
36.1 C (97.0 F)
2009
35.6 C (96.1 F)
2010
34.4 C (93.9 F)
2011
35.6 C (96.1 F)
2012
36.1 C (97.0 F)
2013
37.2 C (99.0 F)
2014
35.6 C (96.1 F)
2015
37.8 C (100.0 F)
2016
35.6 C (96.1 F)
2017
36.1 C (97.0 F)
2018
37.2 C (99.0 F)
2019
8.9 C (48.0 F)
Coldest night (TNn)
The coldest night of the year at May 2SSE, 1934 to 2019. The record is -40.0 C (-40.0 F) in 1937, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at May 2SSE by year
Year
Coldest night (TNn)
1934
-20.0 C (-4.0 F)
1935
-28.9 C (-20.0 F)
1936
-30.0 C (-22.0 F)
1937
-40.0 C (-40.0 F)
1938
-26.7 C (-16.1 F)
1939
-27.8 C (-18.0 F)
1940
-27.8 C (-18.0 F)
1941
-23.3 C (-9.9 F)
1942
-35.6 C (-32.1 F)
1943
-34.4 C (-29.9 F)
1944
-30.6 C (-23.1 F)
1945
-25.6 C (-14.1 F)
1946
-23.9 C (-11.0 F)
1947
-30.0 C (-22.0 F)
1948
-33.9 C (-29.0 F)
1949
-39.4 C (-38.9 F)
1950
-29.4 C (-20.9 F)
1951
-34.4 C (-29.9 F)
1952
-31.7 C (-25.1 F)
1953
-18.3 C (-0.9 F)
1954
-27.8 C (-18.0 F)
1955
-28.3 C (-18.9 F)
1956
-37.2 C (-35.0 F)
1957
-36.7 C (-34.1 F)
1958
-29.4 C (-20.9 F)
1959
-28.9 C (-20.0 F)
1960
-32.8 C (-27.0 F)
1961
-27.8 C (-18.0 F)
1962
-38.9 C (-38.0 F)
1963
-31.1 C (-24.0 F)
1964
-32.8 C (-27.0 F)
1965
-22.2 C (-8.0 F)
1966
-21.7 C (-7.1 F)
1967
-24.4 C (-11.9 F)
1968
-26.7 C (-16.1 F)
1969
-20.6 C (-5.1 F)
1970
-29.4 C (-20.9 F)
1971
-29.4 C (-20.9 F)
1972
-36.1 C (-33.0 F)
1973
-28.9 C (-20.0 F)
1974
-33.9 C (-29.0 F)
1975
-28.9 C (-20.0 F)
1976
-28.9 C (-20.0 F)
1977
-27.2 C (-17.0 F)
1978
-33.9 C (-29.0 F)
1979
-36.1 C (-33.0 F)
1980
-32.2 C (-26.0 F)
1981
-23.3 C (-9.9 F)
1982
-34.4 C (-29.9 F)
1983
-40.0 C (-40.0 F)
1984
-34.4 C (-29.9 F)
1985
-34.4 C (-29.9 F)
1986
-25.6 C (-14.1 F)
1987
-26.1 C (-15.0 F)
1988
-25.6 C (-14.1 F)
1989
-34.4 C (-29.9 F)
2000
-19.4 C (-2.9 F)
2001
-28.3 C (-18.9 F)
2002
-25.6 C (-14.1 F)
2003
-22.2 C (-8.0 F)
2004
-27.2 C (-17.0 F)
2005
-29.4 C (-20.9 F)
2006
-23.9 C (-11.0 F)
2007
-25.6 C (-14.1 F)
2008
-31.1 C (-24.0 F)
2009
-26.1 C (-15.0 F)
2010
-26.7 C (-16.1 F)
2011
-26.1 C (-15.0 F)
2012
-23.9 C (-11.0 F)
2013
-28.9 C (-20.0 F)
2014
-31.7 C (-25.1 F)
2015
-25.0 C (-13.0 F)
2016
-30.0 C (-22.0 F)
2017
-35.0 C (-31.0 F)
2018
-17.8 C (0.0 F)
2019
-25.6 C (-14.1 F)
Wettest day (Rx1day)
The wettest day of the year at May 2SSE, 1934 to 2019. The record is 36.8 mm (1.4 in) in 1953, marked on the chart; the median year is 16.4 mm (0.6 in).
Wettest day (Rx1day) at May 2SSE by year
Year
Wettest day (Rx1day)
1934
18.5 mm (0.7 in)
1935
5.1 mm (0.20 in)
1936
19.1 mm (0.8 in)
1937
10.2 mm (0.4 in)
1938
24.4 mm (1.0 in)
1939
23.4 mm (0.9 in)
1940
20.6 mm (0.8 in)
1941
22.1 mm (0.9 in)
1942
17.0 mm (0.7 in)
1943
14.0 mm (0.6 in)
1944
13.0 mm (0.5 in)
1945
15.0 mm (0.6 in)
1946
22.1 mm (0.9 in)
1947
24.1 mm (0.9 in)
1948
27.4 mm (1.1 in)
1949
9.9 mm (0.39 in)
1950
21.8 mm (0.9 in)
1951
13.2 mm (0.5 in)
1952
30.7 mm (1.2 in)
1953
36.8 mm (1.4 in)
1954
17.0 mm (0.7 in)
1955
20.8 mm (0.8 in)
1956
14.7 mm (0.6 in)
1957
14.2 mm (0.6 in)
1958
14.7 mm (0.6 in)
1959
15.7 mm (0.6 in)
1960
13.7 mm (0.5 in)
1961
17.0 mm (0.7 in)
1962
13.7 mm (0.5 in)
1963
29.7 mm (1.2 in)
1964
20.6 mm (0.8 in)
1965
21.3 mm (0.8 in)
1966
20.3 mm (0.8 in)
1967
13.2 mm (0.5 in)
1968
23.4 mm (0.9 in)
1969
21.1 mm (0.8 in)
1970
30.5 mm (1.2 in)
1971
14.2 mm (0.6 in)
1972
15.5 mm (0.6 in)
1973
13.5 mm (0.5 in)
1974
15.7 mm (0.6 in)
1975
14.7 mm (0.6 in)
1976
15.2 mm (0.6 in)
1977
21.8 mm (0.9 in)
1978
15.0 mm (0.6 in)
1979
14.2 mm (0.6 in)
1980
18.5 mm (0.7 in)
1981
11.9 mm (0.5 in)
1982
13.7 mm (0.5 in)
1983
28.4 mm (1.1 in)
1984
16.0 mm (0.6 in)
1985
11.9 mm (0.5 in)
1986
15.2 mm (0.6 in)
1987
27.9 mm (1.1 in)
1988
27.9 mm (1.1 in)
1989
11.2 mm (0.4 in)
2000
12.7 mm (0.5 in)
2001
14.5 mm (0.6 in)
2002
13.5 mm (0.5 in)
2003
7.6 mm (0.30 in)
2004
27.4 mm (1.1 in)
2005
13.7 mm (0.5 in)
2006
30.2 mm (1.2 in)
2007
20.3 mm (0.8 in)
2008
15.2 mm (0.6 in)
2009
16.8 mm (0.7 in)
2010
18.8 mm (0.7 in)
2011
19.6 mm (0.8 in)
2012
27.7 mm (1.1 in)
2013
16.3 mm (0.6 in)
2014
14.5 mm (0.6 in)
2015
16.5 mm (0.6 in)
2016
18.8 mm (0.7 in)
2017
25.9 mm (1.0 in)
2018
15.2 mm (0.6 in)
2019
5.8 mm (0.23 in)
Wettest five days (Rx5day)
The wettest five days of the year at May 2SSE, 1934 to 2019. The record is 54.6 mm (2.1 in) in 1983, marked on the chart; the median year is 27.5 mm (1.1 in).
Wettest five days (Rx5day) at May 2SSE by year
Year
Wettest five days (Rx5day)
1934
22.6 mm (0.9 in)
1935
8.1 mm (0.32 in)
1936
28.9 mm (1.1 in)
1937
19.1 mm (0.8 in)
1938
41.9 mm (1.6 in)
1939
35.6 mm (1.4 in)
1940
28.2 mm (1.1 in)
1941
31.8 mm (1.3 in)
1942
29.4 mm (1.2 in)
1943
17.0 mm (0.7 in)
1944
22.2 mm (0.9 in)
1945
26.5 mm (1.0 in)
1946
38.9 mm (1.5 in)
1947
35.8 mm (1.4 in)
1948
33.3 mm (1.3 in)
1949
19.0 mm (0.7 in)
1950
23.8 mm (0.9 in)
1951
23.6 mm (0.9 in)
1952
34.7 mm (1.4 in)
1953
44.5 mm (1.8 in)
1954
28.7 mm (1.1 in)
1955
34.0 mm (1.3 in)
1956
27.7 mm (1.1 in)
1957
26.2 mm (1.0 in)
1958
34.4 mm (1.4 in)
1959
25.4 mm (1.0 in)
1960
25.4 mm (1.0 in)
1961
23.5 mm (0.9 in)
1962
35.3 mm (1.4 in)
1963
35.5 mm (1.4 in)
1964
37.3 mm (1.5 in)
1965
30.5 mm (1.2 in)
1966
24.3 mm (1.0 in)
1967
24.1 mm (0.9 in)
1968
42.6 mm (1.7 in)
1969
21.1 mm (0.8 in)
1970
37.3 mm (1.5 in)
1971
30.3 mm (1.2 in)
1972
22.1 mm (0.9 in)
1973
29.5 mm (1.2 in)
1974
19.7 mm (0.8 in)
1975
26.1 mm (1.0 in)
1976
21.1 mm (0.8 in)
1977
40.1 mm (1.6 in)
1978
16.5 mm (0.6 in)
1979
21.8 mm (0.9 in)
1980
30.9 mm (1.2 in)
1981
20.3 mm (0.8 in)
1982
23.4 mm (0.9 in)
1983
54.6 mm (2.1 in)
1984
48.5 mm (1.9 in)
1985
24.0 mm (0.9 in)
1986
24.8 mm (1.0 in)
1987
39.3 mm (1.5 in)
1988
36.8 mm (1.4 in)
1989
15.0 mm (0.6 in)
2000
20.3 mm (0.8 in)
2001
16.3 mm (0.6 in)
2002
18.3 mm (0.7 in)
2003
10.2 mm (0.4 in)
2004
27.4 mm (1.1 in)
2005
24.2 mm (1.0 in)
2006
36.6 mm (1.4 in)
2007
21.1 mm (0.8 in)
2008
20.8 mm (0.8 in)
2009
52.9 mm (2.1 in)
2010
32.7 mm (1.3 in)
2011
32.1 mm (1.3 in)
2012
35.8 mm (1.4 in)
2013
23.5 mm (0.9 in)
2014
27.8 mm (1.1 in)
2015
21.3 mm (0.8 in)
2016
34.0 mm (1.3 in)
2017
37.4 mm (1.5 in)
2018
27.6 mm (1.1 in)
2019
5.8 mm (0.23 in)
Longest dry spell (CDD)
The longest dry spell of the year at May 2SSE, 1934 to 2019. The record is 153 days in 1988, marked on the chart; the median year is 40 days.
Longest dry spell (CDD) at May 2SSE by year
Year
Longest dry spell (CDD)
1934
30 days
1935
31 days
1936
61 days
1937
39 days
1938
52 days
1939
55 days
1940
36 days
1941
22 days
1942
103 days
1943
32 days
1944
33 days
1945
78 days
1946
37 days
1947
40 days
1948
47 days
1949
65 days
1950
35 days
1951
48 days
1952
39 days
1953
35 days
1954
49 days
1955
56 days
1956
44 days
1957
31 days
1958
55 days
1959
63 days
1960
38 days
1961
55 days
1962
39 days
1963
33 days
1964
35 days
1965
67 days
1966
54 days
1967
50 days
1968
41 days
1969
53 days
1970
48 days
1971
37 days
1972
53 days
1973
43 days
1974
59 days
1975
43 days
1976
59 days
1977
58 days
1978
70 days
1979
30 days
1980
27 days
1981
68 days
1982
35 days
1983
32 days
1984
37 days
1985
37 days
1986
40 days
1987
67 days
1988
153 days
1989
45 days
2000
37 days
2001
41 days
2002
30 days
2003
42 days
2004
35 days
2005
27 days
2006
53 days
2007
33 days
2008
40 days
2009
48 days
2010
28 days
2011
40 days
2012
33 days
2013
36 days
2014
22 days
2015
32 days
2016
28 days
2017
29 days
2018
52 days
2019
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
52 years with a frost
Across 52 years with a frost, the median last spring frost at May 2SSE falls on 16 June and the median first autumn frost on 3 September, which leaves a median of 80 days between them.
Fitted over all years, the growing season changes by +2.1 days per decade at this station.
Frost dates and growing season at May 2SSE
Measure
Median, all years
Earliest period
Recent period (1963 to 2016)
Recent against earliest
Fitted trend
Last spring frost
16 June
n/a
14 June
n/a
-0.8 days per decade
First autumn frost
3 September
n/a
4 September
n/a
+1.3 days per decade
Growing days
80 days
n/a
82 days
n/a
+2.1 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
61 years, 1936 to 2018
A day with at least 17.0 mm (0.7 in) of rain is expected about once in 2 years. A day with at least 38.6 mm (1.5 in) of rain is expected about once in 100 years.
Rainfall return levels at May 2SSE: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
17.0 mm (0.7 in)
5 years
22.0 mm (0.9 in)
10 years
25.7 mm (1.0 in)
25 years
30.6 mm (1.2 in)
50 years
34.5 mm (1.4 in)
100 years
38.6 mm (1.5 in)
Longer than the 61 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, 61 years of values from 1936 to 2018.
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: 36.8 mm (1.4 in) in 1953; 30.7 mm (1.2 in) in 1952; 29.7 mm (1.2 in) in 1963.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of May 2SSE, at 1970. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1970 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at May 2SSE, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1970
+0.4
+0.7
likely
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 May 2SSE standing records by year: CSV or JSON. Field meanings are on the data page.
Data for May 2SSE 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.