Record envelope, standing records and threshold days for Clarion (USC00131541), Iowa, United States, with 78 years of record.
Key Facts for Clarion
Clarion (USC00131541) is a weather station in Iowa, United States at 42.72 latitude and -93.73 longitude, 352 m (1,156 ft) above sea level.
The station reports from 1944 to 2021, 78 years of record.
1,464 records set at Clarion still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Clarion tied a daily record low minimum temperature of -10.0 C (14.0 F) on 1 April 2021.
About the Station
Location: Iowa, United States, 42.72 latitude, -93.73 longitude.
Elevation: 352 m (1,156 ft).
Period of record: 1944 to 2021, 78 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 Clarion. 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 Clarion, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.9 C (66.0 F)
-35.6 C (-32.1 F)
n/a
n/a
Feb
19.4 C (66.9 F)
-34.4 C (-29.9 F)
n/a
n/a
Mar
30.0 C (86.0 F)
-32.2 C (-26.0 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-16.1 C (3.0 F)
n/a
n/a
May
38.9 C (102.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
1.1 C (34.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
5.6 C (42.1 F)
n/a
n/a
Aug
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
37.2 C (99.0 F)
-6.1 C (21.0 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-11.1 C (12.0 F)
n/a
n/a
Nov
29.4 C (84.9 F)
-27.8 C (-18.0 F)
n/a
n/a
Dec
19.4 C (66.9 F)
-32.2 C (-26.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Clarion still stand. 1947 holds the most, with 48.
Standing records at Clarion by the year they were set
Year set
Standing records
1944
4
1945
23
1946
27
1947
48
1948
24
1949
20
1950
30
1951
31
1952
27
1953
18
1954
16
1955
23
1956
22
1957
13
1958
14
1959
31
1960
17
1961
14
1962
35
1963
23
1964
26
1965
23
1966
27
1967
30
1968
30
1969
16
1970
29
1971
24
1972
21
1973
6
1974
23
1975
19
1976
26
1977
36
1978
12
1979
16
1980
13
1981
21
1982
16
1983
29
1984
17
1985
26
1986
21
1987
21
1988
32
1989
19
1990
26
1991
36
1992
16
1993
19
1994
17
1995
11
1996
20
1997
21
1998
20
1999
11
2000
17
2001
11
2002
6
2003
6
2004
15
2005
16
2006
15
2007
10
2008
6
2009
8
2010
6
2011
16
2012
26
2013
5
2014
12
2015
7
2016
4
2017
14
2018
12
2019
6
2020
10
All-Time Record Progression
2 new records
2 all-time records were set at Clarion between 20 September 1983 and 24 December 1983. Each dot is a new record.
When Clarion set new all-time records
Date
Kind
Detail
1983-09-20
Record daily precipitation
Record daily precipitation 145.8 mm (5.7 in)
1983-12-24
Record low maximum temperature
Record low maximum temperature -27.8 C (-18.0 F)
Wettest Day of Each Month
Sep: 145.8 mm (5.7 in)
The wettest day on record for each calendar month at Clarion. The most was 145.8 mm (5.7 in) on 20 September 1983.
Record daily precipitation for each month at Clarion
Month
Record daily precipitation (mm)
Date
Jan
36.8 mm (1.4 in)
25 January 1967
Feb
50.8 mm (2.0 in)
18 February 2014
Mar
101.6 mm (4.0 in)
9 March 2011
Apr
88.4 mm (3.5 in)
29 April 1963
May
92.7 mm (3.6 in)
21 May 2001
Jun
130.8 mm (5.1 in)
26 June 1951
Jul
134.1 mm (5.3 in)
17 July 1968
Aug
82.6 mm (3.3 in)
30 August 1962
Sep
145.8 mm (5.7 in)
20 September 1983
Oct
64.5 mm (2.5 in)
11 October 1961
Nov
76.2 mm (3.0 in)
30 November 2008
Dec
68.6 mm (2.7 in)
26 December 2008
Period of Record Coverage
1944 to 2021
Complete yearUnder 90 percent of days
78 years of record at Clarion, 1944 to 2021. 24 years have data for under 90 percent of days and are left out of rankings: 1944, 1958, 1973, 2000, 2001, 2002, 2003, 2005 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 56 complete years at Clarion, 1945 to 2009. Blue stripes are years cooler than the station's own mean of 7.7 C (45.9 F); red stripes are warmer. The coolest year was 1979, at 6.0 C (42.7 F), and the warmest was 1987, at 9.9 C (49.9 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Clarion as warming stripes, 1945 to 2009
Year
Annual mean temperature
Difference from the station mean
1945
7.4 C
-0.33 C
1946
8.8 C
+1.09 C
1947
8.1 C
+0.33 C
1948
8.4 C
+0.64 C
1949
8.6 C
+0.84 C
1950
6.3 C
-1.42 C
1951
6.3 C
-1.48 C
1952
8.2 C
+0.41 C
1953
8.8 C
+1.04 C
1954
8.9 C
+1.14 C
1955
8.3 C
+0.57 C
1956
8.1 C
+0.38 C
1957
8.0 C
+0.29 C
1959
7.8 C
+0.06 C
1960
7.6 C
-0.20 C
1961
7.9 C
+0.11 C
1962
7.5 C
-0.29 C
1963
8.5 C
+0.70 C
1964
8.9 C
+1.19 C
1965
7.6 C
-0.19 C
1966
7.7 C
-0.10 C
1967
7.8 C
+0.09 C
1968
8.4 C
+0.60 C
1969
7.0 C
-0.79 C
1970
7.5 C
-0.25 C
1971
8.0 C
+0.25 C
1972
7.0 C
-0.78 C
1974
7.4 C
-0.40 C
1975
7.7 C
-0.02 C
1976
7.5 C
-0.23 C
1977
8.2 C
+0.43 C
1978
6.4 C
-1.31 C
1979
6.0 C
-1.78 C
1980
7.7 C
-0.04 C
1981
8.4 C
+0.65 C
1982
6.7 C
-1.01 C
1983
7.6 C
-0.16 C
1984
7.6 C
-0.15 C
1985
6.6 C
-1.13 C
1986
7.7 C
-0.09 C
1987
9.9 C
+2.19 C
1988
7.7 C
-0.07 C
1989
6.8 C
-0.95 C
1990
8.5 C
+0.71 C
1991
7.8 C
+0.00 C
1992
7.9 C
+0.19 C
1993
6.2 C
-1.55 C
1994
7.2 C
-0.54 C
1995
7.2 C
-0.53 C
1996
6.1 C
-1.68 C
1997
7.3 C
-0.45 C
1998
9.7 C
+1.98 C
1999
8.9 C
+1.18 C
2004
8.2 C
+0.46 C
2007
8.4 C
+0.67 C
2009
7.5 C
-0.29 C
The fitted trend in annual mean temperature here over 1945 to 2009 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.3 to 0.1) per decade. The slope is a straight line fitted to 56 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Clarion
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.3 to 0.1) per decade
1945 to 2009
56
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.2 to 0.1) per decade
-0.1 F (-0.4 to 0.1) per decade
1945 to 2009
56
Not clearly different from zero
Mean daily minimum
-0.02 C (-0.15 to 0.11) per decade
-0.04 F (-0.28 to 0.19) per decade
1945 to 2009
56
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
1944 to 2021
Yearly extremes at Clarion: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.4 C (102.9 F)
1955
35.6 C (96.1 F)
78
Coldest night (TNn)
-35.6 C (-32.1 F)
1970
-29.4 C (-20.9 F)
78
Wettest day (Rx1day)
145.8 mm (5.7 in)
1983
63.8 mm (2.5 in)
78
Wettest five days (Rx5day)
209.6 mm (8.3 in)
1967
96.6 mm (3.8 in)
77
Longest dry spell (CDD)
64 days
2002
24 days
78
Hottest day (TXx)
The hottest day of the year at Clarion, 1944 to 2021. The record is 39.4 C (102.9 F) in 1955, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Clarion by year
Year
Hottest day (TXx)
1944
30.6 C (87.1 F)
1945
35.6 C (96.1 F)
1946
36.1 C (97.0 F)
1947
38.3 C (100.9 F)
1948
37.8 C (100.0 F)
1949
35.6 C (96.1 F)
1950
33.3 C (91.9 F)
1951
32.8 C (91.0 F)
1952
35.6 C (96.1 F)
1953
36.7 C (98.1 F)
1954
35.6 C (96.1 F)
1955
39.4 C (102.9 F)
1956
36.1 C (97.0 F)
1957
36.1 C (97.0 F)
1958
33.9 C (93.0 F)
1959
36.1 C (97.0 F)
1960
35.6 C (96.1 F)
1961
34.4 C (93.9 F)
1962
32.8 C (91.0 F)
1963
35.6 C (96.1 F)
1964
34.4 C (93.9 F)
1965
36.7 C (98.1 F)
1966
36.7 C (98.1 F)
1967
37.8 C (100.0 F)
1968
35.0 C (95.0 F)
1969
33.9 C (93.0 F)
1970
36.7 C (98.1 F)
1971
36.1 C (97.0 F)
1972
34.4 C (93.9 F)
1973
35.0 C (95.0 F)
1974
36.7 C (98.1 F)
1975
34.4 C (93.9 F)
1976
36.7 C (98.1 F)
1977
38.9 C (102.0 F)
1978
36.1 C (97.0 F)
1979
33.9 C (93.0 F)
1980
38.3 C (100.9 F)
1981
35.6 C (96.1 F)
1982
36.1 C (97.0 F)
1983
37.2 C (99.0 F)
1984
35.6 C (96.1 F)
1985
38.9 C (102.0 F)
1986
34.4 C (93.9 F)
1987
37.8 C (100.0 F)
1988
38.9 C (102.0 F)
1989
35.6 C (96.1 F)
1990
37.8 C (100.0 F)
1991
36.7 C (98.1 F)
1992
33.3 C (91.9 F)
1993
32.8 C (91.0 F)
1994
33.3 C (91.9 F)
1995
38.3 C (100.9 F)
1996
34.4 C (93.9 F)
1997
34.4 C (93.9 F)
1998
34.4 C (93.9 F)
1999
36.1 C (97.0 F)
2000
36.7 C (98.1 F)
2001
33.3 C (91.9 F)
2002
33.9 C (93.0 F)
2003
36.1 C (97.0 F)
2004
32.8 C (91.0 F)
2005
35.6 C (96.1 F)
2006
36.1 C (97.0 F)
2007
35.0 C (95.0 F)
2008
33.9 C (93.0 F)
2009
35.0 C (95.0 F)
2010
35.0 C (95.0 F)
2011
37.2 C (99.0 F)
2012
38.3 C (100.9 F)
2013
38.9 C (102.0 F)
2014
32.8 C (91.0 F)
2015
35.6 C (96.1 F)
2016
35.0 C (95.0 F)
2017
34.4 C (93.9 F)
2018
37.8 C (100.0 F)
2019
32.8 C (91.0 F)
2020
36.7 C (98.1 F)
2021
8.3 C (46.9 F)
Coldest night (TNn)
The coldest night of the year at Clarion, 1944 to 2021. The record is -35.6 C (-32.1 F) in 1970, marked on the chart; the median year is -29.4 C (-20.9 F).
Coldest night (TNn) at Clarion by year
Year
Coldest night (TNn)
1944
-27.8 C (-18.0 F)
1945
-28.3 C (-18.9 F)
1946
-30.0 C (-22.0 F)
1947
-28.3 C (-18.9 F)
1948
-32.2 C (-26.0 F)
1949
-28.9 C (-20.0 F)
1950
-31.1 C (-24.0 F)
1951
-31.1 C (-24.0 F)
1952
-27.8 C (-18.0 F)
1953
-27.8 C (-18.0 F)
1954
-29.4 C (-20.9 F)
1955
-28.3 C (-18.9 F)
1956
-31.7 C (-25.1 F)
1957
-28.9 C (-20.0 F)
1958
-32.2 C (-26.0 F)
1959
-29.4 C (-20.9 F)
1960
-31.7 C (-25.1 F)
1961
-31.7 C (-25.1 F)
1962
-32.8 C (-27.0 F)
1963
-31.1 C (-24.0 F)
1964
-26.1 C (-15.0 F)
1965
-30.0 C (-22.0 F)
1966
-32.8 C (-27.0 F)
1967
-31.7 C (-25.1 F)
1968
-28.9 C (-20.0 F)
1969
-27.8 C (-18.0 F)
1970
-35.6 C (-32.1 F)
1971
-32.2 C (-26.0 F)
1972
-34.4 C (-29.9 F)
1973
-27.8 C (-18.0 F)
1974
-32.2 C (-26.0 F)
1975
-28.3 C (-18.9 F)
1976
-27.8 C (-18.0 F)
1977
-31.1 C (-24.0 F)
1978
-27.8 C (-18.0 F)
1979
-32.8 C (-27.0 F)
1980
-25.6 C (-14.1 F)
1981
-29.4 C (-20.9 F)
1982
-33.9 C (-29.0 F)
1983
-32.2 C (-26.0 F)
1984
-30.6 C (-23.1 F)
1985
-30.6 C (-23.1 F)
1986
-28.9 C (-20.0 F)
1987
-23.9 C (-11.0 F)
1988
-33.9 C (-29.0 F)
1989
-31.1 C (-24.0 F)
1990
-32.2 C (-26.0 F)
1991
-29.4 C (-20.9 F)
1992
-23.9 C (-11.0 F)
1993
-32.8 C (-27.0 F)
1994
-33.3 C (-27.9 F)
1995
-26.1 C (-15.0 F)
1996
-33.9 C (-29.0 F)
1997
-26.1 C (-15.0 F)
1998
-23.3 C (-9.9 F)
1999
-28.9 C (-20.0 F)
2000
-26.1 C (-15.0 F)
2001
-26.7 C (-16.1 F)
2002
-23.9 C (-11.0 F)
2003
-30.0 C (-22.0 F)
2004
-26.7 C (-16.1 F)
2005
-28.3 C (-18.9 F)
2006
-26.7 C (-16.1 F)
2007
-27.2 C (-17.0 F)
2008
-28.9 C (-20.0 F)
2009
-32.2 C (-26.0 F)
2010
-32.2 C (-26.0 F)
2011
-25.6 C (-14.1 F)
2012
-21.1 C (-6.0 F)
2013
-26.7 C (-16.1 F)
2014
-28.3 C (-18.9 F)
2015
-29.4 C (-20.9 F)
2016
-29.4 C (-20.9 F)
2017
-25.6 C (-14.1 F)
2018
-32.2 C (-26.0 F)
2019
-32.2 C (-26.0 F)
2020
-21.1 C (-6.0 F)
2021
-21.1 C (-6.0 F)
Wettest day (Rx1day)
The wettest day of the year at Clarion, 1944 to 2021. The record is 145.8 mm (5.7 in) in 1983, marked on the chart; the median year is 63.8 mm (2.5 in).
Wettest day (Rx1day) at Clarion by year
Year
Wettest day (Rx1day)
1944
22.9 mm (0.9 in)
1945
53.3 mm (2.1 in)
1946
35.6 mm (1.4 in)
1947
66.0 mm (2.6 in)
1948
38.1 mm (1.5 in)
1949
33.0 mm (1.3 in)
1950
66.0 mm (2.6 in)
1951
130.8 mm (5.1 in)
1952
53.3 mm (2.1 in)
1953
44.5 mm (1.8 in)
1954
101.1 mm (4.0 in)
1955
57.2 mm (2.3 in)
1956
36.8 mm (1.4 in)
1957
63.2 mm (2.5 in)
1958
81.3 mm (3.2 in)
1959
66.5 mm (2.6 in)
1960
43.9 mm (1.7 in)
1961
64.5 mm (2.5 in)
1962
82.6 mm (3.3 in)
1963
88.4 mm (3.5 in)
1964
120.7 mm (4.8 in)
1965
48.0 mm (1.9 in)
1966
66.0 mm (2.6 in)
1967
107.2 mm (4.2 in)
1968
134.1 mm (5.3 in)
1969
45.0 mm (1.8 in)
1970
50.8 mm (2.0 in)
1971
69.9 mm (2.8 in)
1972
43.4 mm (1.7 in)
1973
82.3 mm (3.2 in)
1974
53.6 mm (2.1 in)
1975
69.9 mm (2.8 in)
1976
38.9 mm (1.5 in)
1977
64.8 mm (2.6 in)
1978
51.8 mm (2.0 in)
1979
68.6 mm (2.7 in)
1980
51.8 mm (2.0 in)
1981
96.3 mm (3.8 in)
1982
131.1 mm (5.2 in)
1983
145.8 mm (5.7 in)
1984
62.2 mm (2.4 in)
1985
48.8 mm (1.9 in)
1986
52.8 mm (2.1 in)
1987
82.3 mm (3.2 in)
1988
45.5 mm (1.8 in)
1989
50.8 mm (2.0 in)
1990
59.4 mm (2.3 in)
1991
86.6 mm (3.4 in)
1992
59.7 mm (2.4 in)
1993
86.4 mm (3.4 in)
1994
94.0 mm (3.7 in)
1995
64.0 mm (2.5 in)
1996
39.9 mm (1.6 in)
1997
68.1 mm (2.7 in)
1998
63.5 mm (2.5 in)
1999
50.8 mm (2.0 in)
2000
98.6 mm (3.9 in)
2001
92.7 mm (3.6 in)
2002
69.6 mm (2.7 in)
2003
43.9 mm (1.7 in)
2004
59.7 mm (2.4 in)
2005
68.6 mm (2.7 in)
2006
49.0 mm (1.9 in)
2007
83.8 mm (3.3 in)
2008
76.2 mm (3.0 in)
2009
50.3 mm (2.0 in)
2010
106.7 mm (4.2 in)
2011
101.6 mm (4.0 in)
2012
76.2 mm (3.0 in)
2013
57.2 mm (2.3 in)
2014
82.6 mm (3.3 in)
2015
33.0 mm (1.3 in)
2016
97.0 mm (3.8 in)
2017
46.5 mm (1.8 in)
2018
86.4 mm (3.4 in)
2019
30.7 mm (1.2 in)
2020
47.5 mm (1.9 in)
2021
11.2 mm (0.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Clarion, 1944 to 2021. The record is 209.6 mm (8.3 in) in 1967, marked on the chart; the median year is 96.6 mm (3.8 in).
Wettest five days (Rx5day) at Clarion by year
Year
Wettest five days (Rx5day)
1944
26.7 mm (1.1 in)
1945
106.1 mm (4.2 in)
1946
86.9 mm (3.4 in)
1947
78.7 mm (3.1 in)
1948
69.9 mm (2.8 in)
1949
70.1 mm (2.8 in)
1950
86.3 mm (3.4 in)
1951
137.1 mm (5.4 in)
1952
72.4 mm (2.9 in)
1953
71.1 mm (2.8 in)
1954
144.3 mm (5.7 in)
1955
58.5 mm (2.3 in)
1956
46.0 mm (1.8 in)
1957
104.1 mm (4.1 in)
1958
104.7 mm (4.1 in)
1959
137.9 mm (5.4 in)
1960
62.0 mm (2.4 in)
1961
73.4 mm (2.9 in)
1962
116.4 mm (4.6 in)
1963
102.6 mm (4.0 in)
1964
125.0 mm (4.9 in)
1965
123.0 mm (4.8 in)
1966
68.0 mm (2.7 in)
1967
209.6 mm (8.3 in)
1968
139.9 mm (5.5 in)
1969
104.4 mm (4.1 in)
1970
93.7 mm (3.7 in)
1971
96.6 mm (3.8 in)
1972
99.8 mm (3.9 in)
1973
85.6 mm (3.4 in)
1974
56.6 mm (2.2 in)
1975
74.0 mm (2.9 in)
1976
51.6 mm (2.0 in)
1977
66.1 mm (2.6 in)
1978
82.3 mm (3.2 in)
1979
88.7 mm (3.5 in)
1980
92.7 mm (3.6 in)
1981
107.0 mm (4.2 in)
1982
150.5 mm (5.9 in)
1983
181.1 mm (7.1 in)
1984
145.0 mm (5.7 in)
1985
61.8 mm (2.4 in)
1986
76.0 mm (3.0 in)
1987
112.0 mm (4.4 in)
1988
57.2 mm (2.3 in)
1989
62.3 mm (2.5 in)
1990
82.0 mm (3.2 in)
1991
117.5 mm (4.6 in)
1992
113.0 mm (4.4 in)
1993
131.8 mm (5.2 in)
1994
144.0 mm (5.7 in)
1995
126.5 mm (5.0 in)
1996
61.5 mm (2.4 in)
1997
97.0 mm (3.8 in)
1998
81.8 mm (3.2 in)
1999
78.7 mm (3.1 in)
2000
103.2 mm (4.1 in)
2001
107.8 mm (4.2 in)
2002
125.2 mm (4.9 in)
2003
78.3 mm (3.1 in)
2004
110.8 mm (4.4 in)
2005
130.1 mm (5.1 in)
2006
52.4 mm (2.1 in)
2007
186.9 mm (7.4 in)
2008
101.6 mm (4.0 in)
2009
122.0 mm (4.8 in)
2010
180.4 mm (7.1 in)
2011
49.5 mm (1.9 in)
2012
107.9 mm (4.2 in)
2013
39.1 mm (1.5 in)
2014
174.8 mm (6.9 in)
2015
63.1 mm (2.5 in)
2016
112.0 mm (4.4 in)
2017
57.2 mm (2.3 in)
2018
126.3 mm (5.0 in)
2019
12.7 mm (0.5 in)
2020
69.6 mm (2.7 in)
2021
n/a
Longest dry spell (CDD)
The longest dry spell of the year at Clarion, 1944 to 2021. The record is 64 days in 2002, marked on the chart; the median year is 24 days.
Longest dry spell (CDD) at Clarion by year
Year
Longest dry spell (CDD)
1944
25 days
1945
30 days
1946
25 days
1947
31 days
1948
41 days
1949
33 days
1950
22 days
1951
18 days
1952
55 days
1953
24 days
1954
30 days
1955
20 days
1956
33 days
1957
18 days
1958
30 days
1959
25 days
1960
34 days
1961
18 days
1962
39 days
1963
29 days
1964
21 days
1965
21 days
1966
23 days
1967
23 days
1968
30 days
1969
19 days
1970
26 days
1971
17 days
1972
15 days
1973
17 days
1974
31 days
1975
29 days
1976
38 days
1977
18 days
1978
20 days
1979
15 days
1980
30 days
1981
31 days
1982
16 days
1983
15 days
1984
16 days
1985
16 days
1986
33 days
1987
59 days
1988
31 days
1989
33 days
1990
20 days
1991
29 days
1992
22 days
1993
22 days
1994
26 days
1995
17 days
1996
29 days
1997
20 days
1998
45 days
1999
23 days
2000
33 days
2001
25 days
2002
64 days
2003
27 days
2004
20 days
2005
38 days
2006
24 days
2007
42 days
2008
29 days
2009
25 days
2010
29 days
2011
6 days
2012
5 days
2013
11 days
2014
9 days
2015
5 days
2016
5 days
2017
5 days
2018
5 days
2019
5 days
2020
5 days
2021
4 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
56 years with a frost
Across 56 years with a frost, the median last spring frost at Clarion falls on 2 May and the median first autumn frost on 1 October, which leaves a median of 151 days between them.
Fitted over all years, the growing season changes by +2.4 days per decade at this station.
Frost dates and growing season at Clarion
Measure
Median, all years
Earliest period
Recent period (1972 to 2009)
Recent against earliest
Fitted trend
Last spring frost
2 May
n/a
1 May
n/a
-1.8 days per decade
First autumn frost
1 October
n/a
1 October
n/a
+0.6 days per decade
Growing days
151 days
n/a
152 days
n/a
+2.4 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
58 years, 1945 to 2009
A day with at least 60.9 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 171.0 mm (6.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Clarion: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
60.9 mm (2.4 in)
5 years
83.4 mm (3.3 in)
10 years
100.7 mm (4.0 in)
25 years
125.9 mm (5.0 in)
50 years
147.3 mm (5.8 in)
100 years
171.0 mm (6.7 in)
Longer than the 58 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, 58 years of values from 1945 to 2009.
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: 145.8 mm (5.7 in) in 1983; 134.1 mm (5.3 in) in 1968; 131.1 mm (5.2 in) in 1982.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of Clarion, at 1970. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1970 ran 0.2 C (0.3 F) higher than in the years before (possible change).
Suspected changes in the annual mean temperature at Clarion, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1970
+0.2
+0.3
possible
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 Clarion standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Clarion 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.