Record envelope, standing records and threshold days for Colo (USC00131710), Iowa, United States, with 46 years of record.
Key Facts for Colo
Colo (USC00131710) is a weather station in Iowa, United States at 42.02 latitude and -93.32 longitude, 305 m (1,000 ft) above sea level.
The station reports from 1964 to 2009, 46 years of record.
1,464 records set at Colo still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Colo set a daily record snowfall of 7.6 cm (3.0 in) on 14 February 2009.
About the Station
Location: Iowa, United States, 42.02 latitude, -93.32 longitude.
Elevation: 305 m (1,000 ft).
Period of record: 1964 to 2009, 46 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 Colo. 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 Colo, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-33.3 C (-27.9 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-33.3 C (-27.9 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-23.3 C (-9.9 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-15.6 C (3.9 F)
n/a
n/a
May
36.1 C (97.0 F)
-4.4 C (24.1 F)
n/a
n/a
Jun
38.3 C (100.9 F)
2.2 C (36.0 F)
n/a
n/a
Jul
39.4 C (102.9 F)
6.1 C (43.0 F)
n/a
n/a
Aug
40.0 C (104.0 F)
4.4 C (39.9 F)
n/a
n/a
Sep
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
33.9 C (93.0 F)
-11.7 C (10.9 F)
n/a
n/a
Nov
26.7 C (80.1 F)
-23.3 C (-9.9 F)
n/a
n/a
Dec
20.0 C (68.0 F)
-30.6 C (-23.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Colo still stand. 1991 holds the most, with 54.
Standing records at Colo by the year they were set
Year set
Standing records
1964
11
1965
48
1966
51
1967
43
1968
45
1969
23
1970
29
1971
23
1972
49
1973
23
1974
37
1975
30
1976
46
1977
39
1978
28
1979
21
1980
25
1981
29
1982
18
1983
45
1984
25
1985
35
1986
29
1987
35
1988
46
1989
38
1990
42
1991
54
1992
29
1993
24
1994
25
1995
26
1996
40
1997
32
1998
32
1999
22
2000
39
2001
31
2002
24
2003
27
2004
27
2005
30
2006
34
2007
32
2008
20
2009
3
All-Time Record Progression
3 new records
3 all-time records were set at Colo between 3 February 1996 and 1 August 2006. Each dot is a new record.
When Colo set new all-time records
Date
Kind
Detail
1996-02-03
Record low maximum temperature
Record low maximum temperature -25.6 C (-14.1 F)
2004-05-23
Record daily precipitation
Record daily precipitation 132.1 mm (5.2 in)
2006-08-01
Record high minimum temperature
Record high minimum temperature 25.6 C (78.1 F)
Wettest Day of Each Month
May: 132.1 mm (5.2 in)
The wettest day on record for each calendar month at Colo. The most was 132.1 mm (5.2 in) on 23 May 2004.
Record daily precipitation for each month at Colo
Month
Record daily precipitation (mm)
Date
Jan
26.7 mm (1.1 in)
2 January 1966
Feb
47.0 mm (1.9 in)
25 February 2007
Mar
47.0 mm (1.9 in)
31 March 2007
Apr
89.7 mm (3.5 in)
18 April 1976
May
132.1 mm (5.2 in)
23 May 2004
Jun
101.6 mm (4.0 in)
4 June 1991
Jul
123.2 mm (4.9 in)
27 July 1990
Aug
106.7 mm (4.2 in)
29 August 1975
Sep
83.8 mm (3.3 in)
21 September 1986
Oct
85.1 mm (3.4 in)
11 October 1973
Nov
101.6 mm (4.0 in)
4 November 2003
Dec
33.0 mm (1.3 in)
28 December 1982
Period of Record Coverage
1964 to 2009
Complete yearUnder 90 percent of days
46 years of record at Colo, 1964 to 2009. 3 years have data for under 90 percent of days and are left out of rankings: 1964, 1970, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 43 complete years at Colo, 1965 to 2008. Blue stripes are years cooler than the station's own mean of 8.5 C (47.3 F); red stripes are warmer. The coolest year was 1972, at 6.8 C (44.3 F), and the warmest was 1987, at 10.4 C (50.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Colo as warming stripes, 1965 to 2008
Year
Annual mean temperature
Difference from the station mean
1965
8.5 C
+0.05 C
1966
8.5 C
+0.02 C
1967
8.6 C
+0.16 C
1968
9.0 C
+0.49 C
1969
8.1 C
-0.34 C
1971
8.0 C
-0.50 C
1972
6.8 C
-1.64 C
1973
8.8 C
+0.27 C
1974
7.8 C
-0.70 C
1975
7.9 C
-0.54 C
1976
7.7 C
-0.78 C
1977
9.2 C
+0.69 C
1978
7.5 C
-0.99 C
1979
7.2 C
-1.32 C
1980
8.7 C
+0.18 C
1981
9.1 C
+0.60 C
1982
7.5 C
-0.94 C
1983
8.3 C
-0.17 C
1984
8.3 C
-0.16 C
1985
7.4 C
-1.11 C
1986
8.6 C
+0.15 C
1987
10.4 C
+1.89 C
1988
8.8 C
+0.30 C
1989
7.7 C
-0.75 C
1990
9.4 C
+0.88 C
1991
8.7 C
+0.23 C
1992
8.4 C
-0.04 C
1993
7.2 C
-1.29 C
1994
8.1 C
-0.37 C
1995
8.0 C
-0.48 C
1996
6.9 C
-1.54 C
1997
8.2 C
-0.28 C
1998
10.3 C
+1.79 C
1999
9.7 C
+1.17 C
2000
9.2 C
+0.72 C
2001
9.2 C
+0.72 C
2002
9.2 C
+0.75 C
2003
8.6 C
+0.13 C
2004
9.0 C
+0.48 C
2005
9.5 C
+1.01 C
2006
10.0 C
+1.54 C
2007
9.2 C
+0.69 C
2008
7.4 C
-1.06 C
The annual mean temperature here has risen by 0.21 C (0.01 to 0.42) per decade over 1965 to 2008. In Fahrenheit: 0.39 F (0.02 to 0.75) per decade. The slope is a straight line fitted to 43 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Colo
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.21 C (0.01 to 0.42) per decade
0.39 F (0.02 to 0.75) per decade
1965 to 2008
43
Rise
Mean daily maximum
0.1 C (-0.1 to 0.4) per decade
0.2 F (-0.2 to 0.6) per decade
1965 to 2008
43
Not clearly different from zero
Mean daily minimum
0.3 C (0.1 to 0.5) per decade
0.6 F (0.2 to 0.9) per decade
1965 to 2008
43
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
1964 to 2009
Yearly extremes at Colo: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.0 C (104.0 F)
1988
35.0 C (95.0 F)
46
Coldest night (TNn)
-33.3 C (-27.9 F)
1977
-26.9 C (-16.5 F)
46
Wettest day (Rx1day)
132.1 mm (5.2 in)
2004
70.5 mm (2.8 in)
46
Wettest five days (Rx5day)
189.3 mm (7.5 in)
2004
105.0 mm (4.1 in)
46
Longest dry spell (CDD)
49 days
1987
25 days
46
Hottest day (TXx)
The hottest day of the year at Colo, 1964 to 2009. The record is 40.0 C (104.0 F) in 1988, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Colo by year
Year
Hottest day (TXx)
1964
26.7 C (80.1 F)
1965
36.7 C (98.1 F)
1966
36.7 C (98.1 F)
1967
36.1 C (97.0 F)
1968
36.7 C (98.1 F)
1969
33.9 C (93.0 F)
1970
33.9 C (93.0 F)
1971
35.0 C (95.0 F)
1972
33.3 C (91.9 F)
1973
33.9 C (93.0 F)
1974
35.6 C (96.1 F)
1975
33.9 C (93.0 F)
1976
35.0 C (95.0 F)
1977
39.4 C (102.9 F)
1978
36.1 C (97.0 F)
1979
33.3 C (91.9 F)
1980
36.7 C (98.1 F)
1981
36.1 C (97.0 F)
1982
34.4 C (93.9 F)
1983
37.8 C (100.0 F)
1984
35.6 C (96.1 F)
1985
38.3 C (100.9 F)
1986
32.8 C (91.0 F)
1987
36.7 C (98.1 F)
1988
40.0 C (104.0 F)
1989
37.8 C (100.0 F)
1990
37.2 C (99.0 F)
1991
35.0 C (95.0 F)
1992
31.7 C (89.1 F)
1993
32.2 C (90.0 F)
1994
32.8 C (91.0 F)
1995
37.2 C (99.0 F)
1996
35.0 C (95.0 F)
1997
34.4 C (93.9 F)
1998
35.0 C (95.0 F)
1999
36.1 C (97.0 F)
2000
36.7 C (98.1 F)
2001
35.0 C (95.0 F)
2002
34.4 C (93.9 F)
2003
36.1 C (97.0 F)
2004
32.2 C (90.0 F)
2005
35.0 C (95.0 F)
2006
35.6 C (96.1 F)
2007
35.6 C (96.1 F)
2008
33.3 C (91.9 F)
2009
13.3 C (55.9 F)
Coldest night (TNn)
The coldest night of the year at Colo, 1964 to 2009. The record is -33.3 C (-27.9 F) in 1977, marked on the chart; the median year is -26.9 C (-16.5 F).
Coldest night (TNn) at Colo by year
Year
Coldest night (TNn)
1964
-25.6 C (-14.1 F)
1965
-26.1 C (-15.0 F)
1966
-31.7 C (-25.1 F)
1967
-28.3 C (-18.9 F)
1968
-28.3 C (-18.9 F)
1969
-26.1 C (-15.0 F)
1970
-32.8 C (-27.0 F)
1971
-28.3 C (-18.9 F)
1972
-28.9 C (-20.0 F)
1973
-25.6 C (-14.1 F)
1974
-31.1 C (-24.0 F)
1975
-26.1 C (-15.0 F)
1976
-28.3 C (-18.9 F)
1977
-33.3 C (-27.9 F)
1978
-26.7 C (-16.1 F)
1979
-30.6 C (-23.1 F)
1980
-22.8 C (-9.0 F)
1981
-28.9 C (-20.0 F)
1982
-31.7 C (-25.1 F)
1983
-28.9 C (-20.0 F)
1984
-28.3 C (-18.9 F)
1985
-29.4 C (-20.9 F)
1986
-26.7 C (-16.1 F)
1987
-22.2 C (-8.0 F)
1988
-28.3 C (-18.9 F)
1989
-30.6 C (-23.1 F)
1990
-25.6 C (-14.1 F)
1991
-24.4 C (-11.9 F)
1992
-23.3 C (-9.9 F)
1993
-25.6 C (-14.1 F)
1994
-30.0 C (-22.0 F)
1995
-22.8 C (-9.0 F)
1996
-33.3 C (-27.9 F)
1997
-26.1 C (-15.0 F)
1998
-25.6 C (-14.1 F)
1999
-28.3 C (-18.9 F)
2000
-27.2 C (-17.0 F)
2001
-22.8 C (-9.0 F)
2002
-21.1 C (-6.0 F)
2003
-23.3 C (-9.9 F)
2004
-25.0 C (-13.0 F)
2005
-25.6 C (-14.1 F)
2006
-25.0 C (-13.0 F)
2007
-25.0 C (-13.0 F)
2008
-27.8 C (-18.0 F)
2009
-31.1 C (-24.0 F)
Wettest day (Rx1day)
The wettest day of the year at Colo, 1964 to 2009. The record is 132.1 mm (5.2 in) in 2004, marked on the chart; the median year is 70.5 mm (2.8 in).
Wettest day (Rx1day) at Colo by year
Year
Wettest day (Rx1day)
1964
16.8 mm (0.7 in)
1965
45.2 mm (1.8 in)
1966
88.4 mm (3.5 in)
1967
68.6 mm (2.7 in)
1968
79.8 mm (3.1 in)
1969
72.4 mm (2.9 in)
1970
94.0 mm (3.7 in)
1971
42.9 mm (1.7 in)
1972
85.6 mm (3.4 in)
1973
85.1 mm (3.4 in)
1974
92.7 mm (3.6 in)
1975
106.7 mm (4.2 in)
1976
89.7 mm (3.5 in)
1977
89.2 mm (3.5 in)
1978
63.5 mm (2.5 in)
1979
57.2 mm (2.3 in)
1980
48.3 mm (1.9 in)
1981
58.4 mm (2.3 in)
1982
106.7 mm (4.2 in)
1983
73.7 mm (2.9 in)
1984
59.7 mm (2.4 in)
1985
49.5 mm (1.9 in)
1986
83.8 mm (3.3 in)
1987
73.7 mm (2.9 in)
1988
51.8 mm (2.0 in)
1989
43.4 mm (1.7 in)
1990
123.2 mm (4.9 in)
1991
101.6 mm (4.0 in)
1992
60.5 mm (2.4 in)
1993
104.1 mm (4.1 in)
1994
43.7 mm (1.7 in)
1995
41.4 mm (1.6 in)
1996
50.8 mm (2.0 in)
1997
66.5 mm (2.6 in)
1998
48.3 mm (1.9 in)
1999
62.2 mm (2.4 in)
2000
43.2 mm (1.7 in)
2001
91.4 mm (3.6 in)
2002
44.5 mm (1.8 in)
2003
101.6 mm (4.0 in)
2004
132.1 mm (5.2 in)
2005
74.4 mm (2.9 in)
2006
73.7 mm (2.9 in)
2007
56.4 mm (2.2 in)
2008
101.6 mm (4.0 in)
2009
15.7 mm (0.6 in)
Wettest five days (Rx5day)
The wettest five days of the year at Colo, 1964 to 2009. The record is 189.3 mm (7.5 in) in 2004, marked on the chart; the median year is 105.0 mm (4.1 in).
Wettest five days (Rx5day) at Colo by year
Year
Wettest five days (Rx5day)
1964
17.3 mm (0.7 in)
1965
77.0 mm (3.0 in)
1966
140.5 mm (5.5 in)
1967
166.3 mm (6.5 in)
1968
110.8 mm (4.4 in)
1969
111.9 mm (4.4 in)
1970
158.0 mm (6.2 in)
1971
60.6 mm (2.4 in)
1972
115.3 mm (4.5 in)
1973
87.4 mm (3.4 in)
1974
106.5 mm (4.2 in)
1975
122.7 mm (4.8 in)
1976
129.4 mm (5.1 in)
1977
92.7 mm (3.6 in)
1978
117.7 mm (4.6 in)
1979
93.9 mm (3.7 in)
1980
73.2 mm (2.9 in)
1981
76.2 mm (3.0 in)
1982
142.8 mm (5.6 in)
1983
129.3 mm (5.1 in)
1984
107.1 mm (4.2 in)
1985
96.5 mm (3.8 in)
1986
116.9 mm (4.6 in)
1987
102.4 mm (4.0 in)
1988
82.3 mm (3.2 in)
1989
64.0 mm (2.5 in)
1990
154.9 mm (6.1 in)
1991
127.5 mm (5.0 in)
1992
103.5 mm (4.1 in)
1993
142.2 mm (5.6 in)
1994
74.9 mm (2.9 in)
1995
64.0 mm (2.5 in)
1996
60.5 mm (2.4 in)
1997
85.9 mm (3.4 in)
1998
96.9 mm (3.8 in)
1999
77.9 mm (3.1 in)
2000
85.1 mm (3.4 in)
2001
124.5 mm (4.9 in)
2002
94.5 mm (3.7 in)
2003
133.1 mm (5.2 in)
2004
189.3 mm (7.5 in)
2005
110.8 mm (4.4 in)
2006
73.7 mm (2.9 in)
2007
116.4 mm (4.6 in)
2008
134.1 mm (5.3 in)
2009
28.9 mm (1.1 in)
Longest dry spell (CDD)
The longest dry spell of the year at Colo, 1964 to 2009. The record is 49 days in 1987, marked on the chart; the median year is 25 days.
Longest dry spell (CDD) at Colo by year
Year
Longest dry spell (CDD)
1964
20 days
1965
20 days
1966
26 days
1967
31 days
1968
38 days
1969
35 days
1970
37 days
1971
31 days
1972
22 days
1973
19 days
1974
25 days
1975
23 days
1976
45 days
1977
25 days
1978
26 days
1979
30 days
1980
31 days
1981
31 days
1982
17 days
1983
22 days
1984
28 days
1985
25 days
1986
32 days
1987
49 days
1988
31 days
1989
27 days
1990
18 days
1991
36 days
1992
20 days
1993
22 days
1994
23 days
1995
29 days
1996
24 days
1997
15 days
1998
30 days
1999
49 days
2000
18 days
2001
14 days
2002
36 days
2003
19 days
2004
17 days
2005
20 days
2006
18 days
2007
33 days
2008
14 days
2009
15 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
43 years with a frost
Across 43 years with a frost, the median last spring frost at Colo falls on 28 April and the median first autumn frost on 6 October, which leaves a median of 160 days between them.
Fitted over all years, the growing season changes by +3.8 days per decade at this station.
Frost dates and growing season at Colo
Measure
Median, all years
Earliest period
Recent period (1979 to 2008)
Recent against earliest
Fitted trend
Last spring frost
28 April
n/a
26 April
n/a
-2.6 days per decade
First autumn frost
6 October
n/a
6 October
n/a
+1.2 days per decade
Growing days
160 days
n/a
163 days
n/a
+3.8 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
43 years, 1965 to 2008
A day with at least 69.8 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 144.3 mm (5.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Colo: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
69.8 mm (2.7 in)
5 years
92.0 mm (3.6 in)
10 years
105.8 mm (4.2 in)
25 years
122.1 mm (4.8 in)
50 years
133.5 mm (5.3 in)
Longer than the 43 years of record
100 years
144.3 mm (5.7 in)
Longer than the 43 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, 43 years of values from 1965 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: 132.1 mm (5.2 in) in 2004; 123.2 mm (4.9 in) in 1990; 106.7 mm (4.2 in) in 1975.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Colo, at 1971 and 1977. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1971 ran 0.6 C (1.2 F) lower than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.4 C (0.7 F) higher than in the years before (likely change).
Suspected changes in the annual mean temperature at Colo, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1971
-0.6
-1.2
likely
5
1977
+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 Colo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Colo 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.