Record envelope, standing records and threshold days for Swea City 5N (USC00138026), Iowa, United States, with 73 years of record.
Key Facts for Swea City 5N
Swea City 5N (USC00138026) is a weather station in Iowa, United States at 43.45 latitude and -94.31 longitude, 360 m (1,180 ft) above sea level.
The station reports from 1954 to 2026, 73 years of record.
1,464 records set at Swea City 5N still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Swea City 5N set a daily record low minimum temperature of 10.0 C (50.0 F) on 24 July 2026.
About the Station
Location: Iowa, United States, 43.45 latitude, -94.31 longitude.
Elevation: 360 m (1,180 ft).
Period of record: 1954 to 2026, 73 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
10 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 Swea City 5N. The lines show the 2026 daily maximum and minimum. 10 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Swea City 5N, 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)
-35.6 C (-32.1 F)
8.9 C (48.0 F)
-28.3 C (-18.9 F)
Feb
20.6 C (69.1 F)
-33.3 C (-27.9 F)
16.1 C (61.0 F)
-19.4 C (-2.9 F)
Mar
30.0 C (86.0 F)
-28.9 C (-20.0 F)
30.0 C (86.0 F)
-17.8 C (0.0 F)
Apr
33.9 C (93.0 F)
-17.8 C (0.0 F)
30.0 C (86.0 F)
-8.3 C (17.1 F)
May
40.0 C (104.0 F)
-12.2 C (10.0 F)
31.7 C (89.1 F)
-1.7 C (28.9 F)
Jun
40.6 C (105.1 F)
1.7 C (35.1 F)
32.8 C (91.0 F)
8.3 C (46.9 F)
Jul
40.0 C (104.0 F)
6.1 C (43.0 F)
32.2 C (90.0 F)
10.0 C (50.0 F)
Aug
38.3 C (100.9 F)
3.3 C (37.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-5.6 C (21.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-14.4 C (6.1 F)
n/a
n/a
Nov
27.2 C (81.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Dec
20.6 C (69.1 F)
-33.3 C (-27.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Swea City 5N still stand. 1955 holds the most, with 45.
Standing records at Swea City 5N by the year they were set
Year set
Standing records
1954
2
1955
45
1956
20
1957
8
1958
23
1959
29
1960
23
1961
12
1962
34
1963
27
1964
26
1965
22
1966
1
1967
31
1968
33
1969
26
1970
32
1971
22
1972
38
1973
11
1974
29
1975
20
1976
30
1977
21
1978
12
1979
22
1980
18
1981
23
1982
8
1983
36
1984
11
1985
18
1986
13
1987
15
1988
30
1989
16
1990
25
1991
36
1992
27
1993
16
1994
18
1995
17
1996
20
1997
19
1998
22
1999
13
2000
30
2001
33
2002
18
2003
17
2004
20
2005
14
2006
10
2007
16
2008
8
2009
13
2010
13
2011
6
2012
25
2013
15
2014
15
2015
12
2016
10
2017
17
2018
30
2019
20
2020
29
2021
17
2022
18
2023
19
2024
14
2025
15
2026
10
All-Time Record Progression
3 new records
3 all-time records were set at Swea City 5N between 30 August 1993 and 15 September 2004. Each dot is a new record.
When Swea City 5N set new all-time records
Date
Kind
Detail
1993-08-30
Record daily precipitation
Record daily precipitation 114.3 mm (4.5 in)
1994-01-18
Record low maximum temperature
Record low maximum temperature -26.7 C (-16.1 F)
2004-09-15
Record daily precipitation
Record daily precipitation 173.2 mm (6.8 in)
Wettest Day of Each Month
Sep: 173.2 mm (6.8 in)
The wettest day on record for each calendar month at Swea City 5N. The most was 173.2 mm (6.8 in) on 15 September 2004.
Record daily precipitation for each month at Swea City 5N
Month
Record daily precipitation (mm)
Date
Jan
31.8 mm (1.3 in)
21 January 1975
Feb
43.2 mm (1.7 in)
19 February 1971
Mar
53.3 mm (2.1 in)
22 March 2005
Apr
58.9 mm (2.3 in)
23 April 1955
May
97.8 mm (3.9 in)
20 May 1960
Jun
101.6 mm (4.0 in)
4 June 1991
Jul
79.0 mm (3.1 in)
25 July 2014
Aug
114.3 mm (4.5 in)
30 August 1993
Sep
173.2 mm (6.8 in)
15 September 2004
Oct
91.7 mm (3.6 in)
1 October 2007
Nov
50.8 mm (2.0 in)
15 November 1973
Dec
30.0 mm (1.2 in)
28 December 1982
Period of Record Coverage
1954 to 2026
Complete yearUnder 90 percent of days
73 years of record at Swea City 5N, 1954 to 2026. 27 years have data for under 90 percent of days and are left out of rankings: 1954, 1965, 1966, 1967, 1977, 1985, 1986, 1987 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 45 complete years at Swea City 5N, 1955 to 2022. Blue stripes are years cooler than the station's own mean of 7.4 C (45.3 F); red stripes are warmer. The coolest year was 2019, at 5.6 C (42.0 F), and the warmest was 1990, at 9.1 C (48.3 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Swea City 5N as warming stripes, 1955 to 2022
Year
Annual mean temperature
Difference from the station mean
1955
8.0 C
+0.55 C
1957
8.1 C
+0.67 C
1958
8.2 C
+0.78 C
1959
7.6 C
+0.15 C
1960
7.3 C
-0.15 C
1961
7.2 C
-0.17 C
1962
7.4 C
-0.02 C
1963
8.1 C
+0.73 C
1964
8.8 C
+1.38 C
1968
6.9 C
-0.51 C
1969
6.0 C
-1.41 C
1970
6.2 C
-1.22 C
1971
6.6 C
-0.77 C
1972
5.6 C
-1.79 C
1973
8.0 C
+0.56 C
1974
7.3 C
-0.08 C
1975
7.2 C
-0.24 C
1976
7.1 C
-0.27 C
1978
7.0 C
-0.39 C
1979
6.4 C
-0.97 C
1980
8.2 C
+0.75 C
1981
8.7 C
+1.34 C
1982
7.0 C
-0.38 C
1983
7.8 C
+0.41 C
1984
7.7 C
+0.31 C
1988
8.3 C
+0.88 C
1989
7.6 C
+0.15 C
1990
9.1 C
+1.68 C
1991
8.3 C
+0.93 C
1992
8.0 C
+0.58 C
1993
6.5 C
-0.88 C
1994
7.7 C
+0.31 C
1995
7.8 C
+0.42 C
1996
6.4 C
-0.99 C
1997
7.8 C
+0.35 C
1999
8.4 C
+1.04 C
2000
7.4 C
-0.04 C
2001
8.3 C
+0.92 C
2003
7.1 C
-0.35 C
2005
8.0 C
+0.56 C
2007
7.4 C
+0.01 C
2008
6.0 C
-1.37 C
2019
5.6 C
-1.82 C
2020
7.2 C
-0.16 C
2022
6.1 C
-1.31 C
The fitted trend in annual mean temperature here over 1955 to 2022 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 (-0.4 to 0.1) per decade. The slope is a straight line fitted to 45 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Swea City 5N
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 (-0.4 to 0.1) per decade
1955 to 2022
45
Not clearly different from zero
Mean daily maximum
-0.13 C (-0.30 to 0.04) per decade
-0.2 F (-0.5 to 0.1) per decade
1955 to 2022
45
Not clearly different from zero
Mean daily minimum
-0.03 C (-0.20 to 0.14) per decade
-0.05 F (-0.36 to 0.26) per decade
1955 to 2022
45
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
1954 to 2026
Yearly extremes at Swea City 5N: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1985
35.6 C (96.1 F)
73
Coldest night (TNn)
-35.6 C (-32.1 F)
1970
-28.9 C (-20.0 F)
73
Wettest day (Rx1day)
173.2 mm (6.8 in)
2004
56.4 mm (2.2 in)
73
Wettest five days (Rx5day)
209.8 mm (8.3 in)
2004
86.6 mm (3.4 in)
73
Longest dry spell (CDD)
50 days
1986
26 days
73
Hottest day (TXx)
The hottest day of the year at Swea City 5N, 1954 to 2026. The record is 40.6 C (105.1 F) in 1985, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Swea City 5N by year
Year
Hottest day (TXx)
1954
21.1 C (70.0 F)
1955
40.0 C (104.0 F)
1956
36.7 C (98.1 F)
1957
37.2 C (99.0 F)
1958
35.0 C (95.0 F)
1959
35.6 C (96.1 F)
1960
35.0 C (95.0 F)
1961
35.0 C (95.0 F)
1962
32.8 C (91.0 F)
1963
35.6 C (96.1 F)
1964
35.6 C (96.1 F)
1965
37.8 C (100.0 F)
1966
33.9 C (93.0 F)
1967
35.0 C (95.0 F)
1968
35.6 C (96.1 F)
1969
33.9 C (93.0 F)
1970
36.7 C (98.1 F)
1971
38.9 C (102.0 F)
1972
35.6 C (96.1 F)
1973
35.0 C (95.0 F)
1974
35.6 C (96.1 F)
1975
35.6 C (96.1 F)
1976
37.2 C (99.0 F)
1977
36.7 C (98.1 F)
1978
35.6 C (96.1 F)
1979
36.7 C (98.1 F)
1980
37.2 C (99.0 F)
1981
35.0 C (95.0 F)
1982
35.6 C (96.1 F)
1983
36.1 C (97.0 F)
1984
37.8 C (100.0 F)
1985
40.6 C (105.1 F)
1986
36.1 C (97.0 F)
1987
36.7 C (98.1 F)
1988
38.9 C (102.0 F)
1989
36.7 C (98.1 F)
1990
37.8 C (100.0 F)
1991
35.6 C (96.1 F)
1992
32.2 C (90.0 F)
1993
31.7 C (89.1 F)
1994
34.4 C (93.9 F)
1995
38.3 C (100.9 F)
1996
34.4 C (93.9 F)
1997
33.9 C (93.0 F)
1998
34.4 C (93.9 F)
1999
36.1 C (97.0 F)
2000
37.2 C (99.0 F)
2001
36.7 C (98.1 F)
2002
36.7 C (98.1 F)
2003
36.1 C (97.0 F)
2004
33.9 C (93.0 F)
2005
33.3 C (91.9 F)
2006
35.6 C (96.1 F)
2007
36.7 C (98.1 F)
2008
32.8 C (91.0 F)
2009
35.0 C (95.0 F)
2010
34.4 C (93.9 F)
2011
37.8 C (100.0 F)
2012
36.7 C (98.1 F)
2013
40.0 C (104.0 F)
2014
31.7 C (89.1 F)
2015
35.6 C (96.1 F)
2016
36.1 C (97.0 F)
2017
33.9 C (93.0 F)
2018
36.7 C (98.1 F)
2019
33.3 C (91.9 F)
2020
36.1 C (97.0 F)
2021
35.6 C (96.1 F)
2022
36.7 C (98.1 F)
2023
33.9 C (93.0 F)
2024
32.2 C (90.0 F)
2025
33.9 C (93.0 F)
2026
32.8 C (91.0 F)
Coldest night (TNn)
The coldest night of the year at Swea City 5N, 1954 to 2026. The record is -35.6 C (-32.1 F) in 1970, marked on the chart; the median year is -28.9 C (-20.0 F).
Coldest night (TNn) at Swea City 5N by year
Year
Coldest night (TNn)
1954
-18.3 C (-0.9 F)
1955
-28.9 C (-20.0 F)
1956
-29.4 C (-20.9 F)
1957
-27.2 C (-17.0 F)
1958
-30.0 C (-22.0 F)
1959
-31.7 C (-25.1 F)
1960
-28.3 C (-18.9 F)
1961
-28.3 C (-18.9 F)
1962
-31.7 C (-25.1 F)
1963
-31.7 C (-25.1 F)
1964
-26.1 C (-15.0 F)
1965
-30.0 C (-22.0 F)
1966
1.7 C (35.1 F)
1967
-27.8 C (-18.0 F)
1968
-30.0 C (-22.0 F)
1969
-28.9 C (-20.0 F)
1970
-35.6 C (-32.1 F)
1971
-31.7 C (-25.1 F)
1972
-33.3 C (-27.9 F)
1973
-28.9 C (-20.0 F)
1974
-32.2 C (-26.0 F)
1975
-30.0 C (-22.0 F)
1976
-28.9 C (-20.0 F)
1977
-25.6 C (-14.1 F)
1978
-30.0 C (-22.0 F)
1979
-31.7 C (-25.1 F)
1980
-25.0 C (-13.0 F)
1981
-30.0 C (-22.0 F)
1982
-31.7 C (-25.1 F)
1983
-33.3 C (-27.9 F)
1984
-30.6 C (-23.1 F)
1985
-29.4 C (-20.9 F)
1986
-30.0 C (-22.0 F)
1987
-17.8 C (0.0 F)
1988
-31.1 C (-24.0 F)
1989
-30.6 C (-23.1 F)
1990
-32.2 C (-26.0 F)
1991
-25.6 C (-14.1 F)
1992
-25.0 C (-13.0 F)
1993
-29.4 C (-20.9 F)
1994
-31.1 C (-24.0 F)
1995
-23.3 C (-9.9 F)
1996
-33.3 C (-27.9 F)
1997
-25.6 C (-14.1 F)
1998
-23.3 C (-9.9 F)
1999
-30.0 C (-22.0 F)
2000
-28.3 C (-18.9 F)
2001
-27.2 C (-17.0 F)
2002
-23.3 C (-9.9 F)
2003
-26.1 C (-15.0 F)
2004
-28.3 C (-18.9 F)
2005
-27.2 C (-17.0 F)
2006
-19.4 C (-2.9 F)
2007
-27.8 C (-18.0 F)
2008
-28.3 C (-18.9 F)
2009
-32.2 C (-26.0 F)
2010
-35.0 C (-31.0 F)
2011
-27.8 C (-18.0 F)
2012
-22.2 C (-8.0 F)
2013
-25.6 C (-14.1 F)
2014
-30.0 C (-22.0 F)
2015
-26.7 C (-16.1 F)
2016
-33.3 C (-27.9 F)
2017
-28.3 C (-18.9 F)
2018
-30.6 C (-23.1 F)
2019
-33.9 C (-29.0 F)
2020
-27.8 C (-18.0 F)
2021
-30.6 C (-23.1 F)
2022
-30.0 C (-22.0 F)
2023
-25.6 C (-14.1 F)
2024
-27.2 C (-17.0 F)
2025
-27.2 C (-17.0 F)
2026
-28.3 C (-18.9 F)
Wettest day (Rx1day)
The wettest day of the year at Swea City 5N, 1954 to 2026. The record is 173.2 mm (6.8 in) in 2004, marked on the chart; the median year is 56.4 mm (2.2 in).
Wettest day (Rx1day) at Swea City 5N by year
Year
Wettest day (Rx1day)
1954
5.8 mm (0.23 in)
1955
58.9 mm (2.3 in)
1956
50.0 mm (2.0 in)
1957
66.3 mm (2.6 in)
1958
38.6 mm (1.5 in)
1959
77.2 mm (3.0 in)
1960
97.8 mm (3.9 in)
1961
57.2 mm (2.3 in)
1962
100.3 mm (3.9 in)
1963
45.2 mm (1.8 in)
1964
65.3 mm (2.6 in)
1965
37.6 mm (1.5 in)
1966
71.1 mm (2.8 in)
1967
76.2 mm (3.0 in)
1968
48.3 mm (1.9 in)
1969
82.6 mm (3.3 in)
1970
63.5 mm (2.5 in)
1971
56.4 mm (2.2 in)
1972
44.5 mm (1.8 in)
1973
50.8 mm (2.0 in)
1974
53.3 mm (2.1 in)
1975
50.8 mm (2.0 in)
1976
25.4 mm (1.0 in)
1977
59.7 mm (2.4 in)
1978
44.7 mm (1.8 in)
1979
104.6 mm (4.1 in)
1980
54.6 mm (2.1 in)
1981
76.7 mm (3.0 in)
1982
61.2 mm (2.4 in)
1983
47.8 mm (1.9 in)
1984
37.6 mm (1.5 in)
1985
66.8 mm (2.6 in)
1986
40.1 mm (1.6 in)
1987
47.5 mm (1.9 in)
1988
40.6 mm (1.6 in)
1989
41.4 mm (1.6 in)
1990
49.8 mm (2.0 in)
1991
101.6 mm (4.0 in)
1992
72.1 mm (2.8 in)
1993
114.3 mm (4.5 in)
1994
59.9 mm (2.4 in)
1995
50.3 mm (2.0 in)
1996
62.5 mm (2.5 in)
1997
55.9 mm (2.2 in)
1998
76.2 mm (3.0 in)
1999
51.6 mm (2.0 in)
2000
47.2 mm (1.9 in)
2001
50.5 mm (2.0 in)
2002
48.5 mm (1.9 in)
2003
47.8 mm (1.9 in)
2004
173.2 mm (6.8 in)
2005
53.3 mm (2.1 in)
2006
96.5 mm (3.8 in)
2007
91.7 mm (3.6 in)
2008
50.5 mm (2.0 in)
2009
65.3 mm (2.6 in)
2010
62.5 mm (2.5 in)
2011
56.4 mm (2.2 in)
2012
38.4 mm (1.5 in)
2013
82.3 mm (3.2 in)
2014
79.0 mm (3.1 in)
2015
60.5 mm (2.4 in)
2016
52.8 mm (2.1 in)
2017
74.4 mm (2.9 in)
2018
81.3 mm (3.2 in)
2019
42.7 mm (1.7 in)
2020
91.7 mm (3.6 in)
2021
99.6 mm (3.9 in)
2022
73.4 mm (2.9 in)
2023
47.8 mm (1.9 in)
2024
57.9 mm (2.3 in)
2025
47.0 mm (1.9 in)
2026
38.6 mm (1.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Swea City 5N, 1954 to 2026. The record is 209.8 mm (8.3 in) in 2004, marked on the chart; the median year is 86.6 mm (3.4 in).
Wettest five days (Rx5day) at Swea City 5N by year
Year
Wettest five days (Rx5day)
1954
7.3 mm (0.29 in)
1955
86.6 mm (3.4 in)
1956
70.6 mm (2.8 in)
1957
66.3 mm (2.6 in)
1958
59.4 mm (2.3 in)
1959
141.2 mm (5.6 in)
1960
178.5 mm (7.0 in)
1961
99.2 mm (3.9 in)
1962
149.4 mm (5.9 in)
1963
119.6 mm (4.7 in)
1964
113.3 mm (4.5 in)
1965
77.8 mm (3.1 in)
1966
71.9 mm (2.8 in)
1967
113.7 mm (4.5 in)
1968
87.3 mm (3.4 in)
1969
102.9 mm (4.1 in)
1970
95.8 mm (3.8 in)
1971
109.2 mm (4.3 in)
1972
80.0 mm (3.1 in)
1973
111.7 mm (4.4 in)
1974
69.3 mm (2.7 in)
1975
59.7 mm (2.4 in)
1976
30.5 mm (1.2 in)
1977
71.1 mm (2.8 in)
1978
83.9 mm (3.3 in)
1979
146.5 mm (5.8 in)
1980
92.7 mm (3.6 in)
1981
109.0 mm (4.3 in)
1982
94.8 mm (3.7 in)
1983
61.8 mm (2.4 in)
1984
77.1 mm (3.0 in)
1985
91.4 mm (3.6 in)
1986
71.6 mm (2.8 in)
1987
100.8 mm (4.0 in)
1988
43.1 mm (1.7 in)
1989
69.2 mm (2.7 in)
1990
80.1 mm (3.2 in)
1991
130.0 mm (5.1 in)
1992
85.9 mm (3.4 in)
1993
120.9 mm (4.8 in)
1994
89.3 mm (3.5 in)
1995
63.3 mm (2.5 in)
1996
77.0 mm (3.0 in)
1997
73.6 mm (2.9 in)
1998
79.0 mm (3.1 in)
1999
113.3 mm (4.5 in)
2000
65.3 mm (2.6 in)
2001
93.5 mm (3.7 in)
2002
98.7 mm (3.9 in)
2003
53.1 mm (2.1 in)
2004
209.8 mm (8.3 in)
2005
82.8 mm (3.3 in)
2006
102.6 mm (4.0 in)
2007
137.0 mm (5.4 in)
2008
72.1 mm (2.8 in)
2009
75.0 mm (3.0 in)
2010
80.0 mm (3.1 in)
2011
89.7 mm (3.5 in)
2012
49.3 mm (1.9 in)
2013
99.9 mm (3.9 in)
2014
87.1 mm (3.4 in)
2015
94.0 mm (3.7 in)
2016
74.4 mm (2.9 in)
2017
118.8 mm (4.7 in)
2018
118.4 mm (4.7 in)
2019
86.1 mm (3.4 in)
2020
116.4 mm (4.6 in)
2021
145.1 mm (5.7 in)
2022
85.8 mm (3.4 in)
2023
65.8 mm (2.6 in)
2024
82.8 mm (3.3 in)
2025
95.7 mm (3.8 in)
2026
67.1 mm (2.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Swea City 5N, 1954 to 2026. The record is 50 days in 1986, marked on the chart; the median year is 26 days.
Longest dry spell (CDD) at Swea City 5N by year
Year
Longest dry spell (CDD)
1954
24 days
1955
34 days
1956
23 days
1957
27 days
1958
24 days
1959
18 days
1960
34 days
1961
30 days
1962
39 days
1963
28 days
1964
29 days
1965
18 days
1966
9 days
1967
37 days
1968
47 days
1969
21 days
1970
36 days
1971
38 days
1972
21 days
1973
33 days
1974
27 days
1975
26 days
1976
39 days
1977
18 days
1978
20 days
1979
30 days
1980
30 days
1981
29 days
1982
41 days
1983
20 days
1984
28 days
1985
18 days
1986
50 days
1987
24 days
1988
42 days
1989
31 days
1990
26 days
1991
37 days
1992
23 days
1993
22 days
1994
41 days
1995
26 days
1996
34 days
1997
21 days
1998
39 days
1999
22 days
2000
17 days
2001
30 days
2002
36 days
2003
26 days
2004
22 days
2005
17 days
2006
21 days
2007
33 days
2008
15 days
2009
23 days
2010
27 days
2011
20 days
2012
28 days
2013
17 days
2014
19 days
2015
24 days
2016
22 days
2017
21 days
2018
24 days
2019
16 days
2020
28 days
2021
20 days
2022
17 days
2023
22 days
2024
28 days
2025
10 days
2026
27 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
45 years with a frost
Across 45 years with a frost, the median last spring frost at Swea City 5N falls on 2 May and the median first autumn frost on 2 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by +0.4 days per decade at this station.
Frost dates and growing season at Swea City 5N
Measure
Median, all years
Earliest period
Recent period (1974 to 2022)
Recent against earliest
Fitted trend
Last spring frost
2 May
n/a
1 May
n/a
-1.0 days per decade
First autumn frost
2 October
n/a
2 October
n/a
-0.6 days per decade
Growing days
153 days
n/a
153 days
n/a
+0.4 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
54 years, 1955 to 2022
A day with at least 59.2 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 161.3 mm (6.4 in) of rain is expected about once in 100 years.
Rainfall return levels at Swea City 5N: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
59.2 mm (2.3 in)
5 years
80.4 mm (3.2 in)
10 years
96.6 mm (3.8 in)
25 years
119.9 mm (4.7 in)
50 years
139.6 mm (5.5 in)
100 years
161.3 mm (6.4 in)
Longer than the 54 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, 54 years of values from 1955 to 2022.
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: 173.2 mm (6.8 in) in 2004; 114.3 mm (4.5 in) in 1993; 104.6 mm (4.1 in) in 1979.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Swea City 5N standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Swea City 5N 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.