Record envelope, standing records and threshold days for Shamrock #2 (USC00418236), Texas, United States, with 57 years of record.
Key Facts for Shamrock #2
Shamrock #2 (USC00418236) is a weather station in Texas, United States at 35.22 latitude and -100.25 longitude, 719 m (2,360 ft) above sea level.
The station reports from 1962 to 2018, 57 years of record.
1,464 records set at Shamrock #2 still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Shamrock #2 set a daily record low maximum temperature of 23.3 C (73.9 F) on 8 September 2018.
About the Station
Location: Texas, United States, 35.22 latitude, -100.25 longitude.
Elevation: 719 m (2,360 ft).
Period of record: 1962 to 2018, 57 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 Shamrock #2. 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 Shamrock #2, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
29.4 C (84.9 F)
-25.0 C (-13.0 F)
n/a
n/a
Feb
33.9 C (93.0 F)
-21.1 C (-6.0 F)
n/a
n/a
Mar
36.1 C (97.0 F)
-17.2 C (1.0 F)
n/a
n/a
Apr
38.3 C (100.9 F)
-6.1 C (21.0 F)
n/a
n/a
May
41.1 C (106.0 F)
-0.6 C (30.9 F)
n/a
n/a
Jun
46.1 C (115.0 F)
6.1 C (43.0 F)
n/a
n/a
Jul
47.2 C (117.0 F)
11.1 C (52.0 F)
n/a
n/a
Aug
42.8 C (109.0 F)
8.9 C (48.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-1.1 C (30.0 F)
n/a
n/a
Oct
38.9 C (102.0 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
31.7 C (89.1 F)
-12.8 C (9.0 F)
n/a
n/a
Dec
28.9 C (84.0 F)
-22.2 C (-8.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Shamrock #2 still stand. 2011 holds the most, with 82.
Standing records at Shamrock #2 by the year they were set
Year set
Standing records
1962
16
1963
16
1964
12
1965
25
1966
38
1967
41
1968
24
1969
33
1970
48
1971
32
1972
34
1973
16
1974
20
1975
13
1976
24
1977
11
1978
33
1979
33
1980
44
1981
25
1982
17
1983
39
1984
25
1985
25
1986
20
1987
19
1988
13
1989
43
1990
28
1991
22
1992
26
1993
16
1994
16
1995
29
1996
36
1997
23
1998
30
1999
14
2000
26
2001
18
2002
17
2003
17
2004
21
2005
17
2006
27
2007
19
2008
14
2009
19
2010
10
2011
82
2012
33
2013
42
2014
37
2015
18
2016
22
2017
27
2018
19
All-Time Record Progression
6 new records
6 all-time records were set at Shamrock #2 between 4 June 1995 and 26 February 2013. Each dot is a new record.
When Shamrock #2 set new all-time records
Date
Kind
Detail
1995-06-04
Record daily precipitation
Record daily precipitation 209.3 mm (8.2 in)
2000-12-27
Record daily snowfall
Record daily snowfall 22.9 cm (9.0 in)
2000-12-27
Record snow depth
Record snow depth 35.6 cm (14.0 in)
2011-06-27
Record high maximum temperature
Record high maximum temperature 46.1 C (115.0 F)
2011-07-12
Record high maximum temperature
Record high maximum temperature 47.2 C (117.0 F)
2013-02-26
Record daily snowfall
Record daily snowfall 27.9 cm (11.0 in)
Wettest Day of Each Month
Jun: 209.3 mm (8.2 in)
The wettest day on record for each calendar month at Shamrock #2. The most was 209.3 mm (8.2 in) on 4 June 1995.
Record daily precipitation for each month at Shamrock #2
Month
Record daily precipitation (mm)
Date
Jan
34.5 mm (1.4 in)
31 January 2002
Feb
38.6 mm (1.5 in)
25 February 2013
Mar
63.5 mm (2.5 in)
23 March 2000
Apr
76.7 mm (3.0 in)
25 April 1997
May
143.5 mm (5.6 in)
4 May 2001
Jun
209.3 mm (8.2 in)
4 June 1995
Jul
85.6 mm (3.4 in)
4 July 1967
Aug
70.1 mm (2.8 in)
30 August 1972
Sep
125.0 mm (4.9 in)
11 September 2003
Oct
82.8 mm (3.3 in)
31 October 1998
Nov
58.4 mm (2.3 in)
1 November 1998
Dec
48.3 mm (1.9 in)
30 December 2006
Period of Record Coverage
1962 to 2018
Complete yearUnder 90 percent of days
57 years of record at Shamrock #2, 1962 to 2018. 6 years have data for under 90 percent of days and are left out of rankings: 1962, 1963, 1964, 1965, 1986, 2018.
Cooler than the station meanWarmer than the station mean
One stripe for each of 40 complete years at Shamrock #2, 1967 to 2016. Blue stripes are years cooler than the station's own mean of 15.1 C (59.2 F); red stripes are warmer. The coolest year was 1993, at 13.7 C (56.7 F), and the warmest was 2012, at 16.9 C (62.3 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Shamrock #2 as warming stripes, 1967 to 2016
Year
Annual mean temperature
Difference from the station mean
1967
16.0 C
+0.82 C
1968
14.9 C
-0.23 C
1969
15.7 C
+0.58 C
1970
15.8 C
+0.68 C
1971
16.3 C
+1.18 C
1972
16.0 C
+0.87 C
1973
15.7 C
+0.53 C
1976
14.5 C
-0.60 C
1977
15.5 C
+0.32 C
1979
13.8 C
-1.35 C
1980
15.7 C
+0.53 C
1981
15.8 C
+0.68 C
1987
14.6 C
-0.50 C
1988
14.4 C
-0.70 C
1989
14.1 C
-1.06 C
1991
14.8 C
-0.31 C
1992
14.8 C
-0.38 C
1993
13.7 C
-1.39 C
1994
15.1 C
-0.05 C
1995
14.6 C
-0.53 C
1996
14.6 C
-0.56 C
1997
14.1 C
-1.05 C
1998
16.0 C
+0.84 C
1999
15.8 C
+0.62 C
2000
14.9 C
-0.24 C
2001
15.3 C
+0.21 C
2002
14.3 C
-0.86 C
2003
14.9 C
-0.21 C
2004
14.9 C
-0.23 C
2005
15.0 C
-0.11 C
2006
16.1 C
+0.93 C
2007
14.6 C
-0.57 C
2008
15.2 C
+0.02 C
2009
14.8 C
-0.33 C
2010
15.3 C
+0.13 C
2011
16.7 C
+1.55 C
2012
16.9 C
+1.72 C
2013
14.0 C
-1.13 C
2014
14.3 C
-0.82 C
2016
16.0 C
+0.89 C
The fitted trend in annual mean temperature here over 1967 to 2016 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 0.2) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Shamrock #2
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 0.2) per decade
1967 to 2016
40
Not clearly different from zero
Mean daily maximum
-0.1 C (-0.3 to 0.1) per decade
-0.2 F (-0.6 to 0.2) per decade
1967 to 2016
40
Not clearly different from zero
Mean daily minimum
-0.01 C (-0.16 to 0.13) per decade
-0.03 F (-0.29 to 0.24) per decade
1967 to 2016
40
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
1962 to 2018
Yearly extremes at Shamrock #2: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
47.2 C (117.0 F)
2011
40.6 C (105.1 F)
57
Coldest night (TNn)
-25.0 C (-13.0 F)
1984
-16.1 C (3.0 F)
57
Wettest day (Rx1day)
209.3 mm (8.2 in)
1995
56.6 mm (2.2 in)
57
Wettest five days (Rx5day)
270.0 mm (10.6 in)
1995
94.3 mm (3.7 in)
57
Longest dry spell (CDD)
78 days
2000
38 days
57
Hottest day (TXx)
The hottest day of the year at Shamrock #2, 1962 to 2018. The record is 47.2 C (117.0 F) in 2011, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Shamrock #2 by year
Year
Hottest day (TXx)
1962
37.2 C (99.0 F)
1963
34.4 C (93.9 F)
1964
40.6 C (105.1 F)
1965
40.0 C (104.0 F)
1966
41.1 C (106.0 F)
1967
39.4 C (102.9 F)
1968
40.0 C (104.0 F)
1969
42.2 C (108.0 F)
1970
42.2 C (108.0 F)
1971
40.6 C (105.1 F)
1972
38.3 C (100.9 F)
1973
40.6 C (105.1 F)
1974
41.7 C (107.1 F)
1975
37.8 C (100.0 F)
1976
40.0 C (104.0 F)
1977
40.6 C (105.1 F)
1978
41.7 C (107.1 F)
1979
37.8 C (100.0 F)
1980
45.0 C (113.0 F)
1981
43.3 C (109.9 F)
1982
40.6 C (105.1 F)
1983
40.6 C (105.1 F)
1984
40.6 C (105.1 F)
1985
40.0 C (104.0 F)
1986
41.1 C (106.0 F)
1987
37.2 C (99.0 F)
1988
41.1 C (106.0 F)
1989
40.0 C (104.0 F)
1990
40.0 C (104.0 F)
1991
37.2 C (99.0 F)
1992
37.8 C (100.0 F)
1993
38.3 C (100.9 F)
1994
42.8 C (109.0 F)
1995
41.7 C (107.1 F)
1996
40.6 C (105.1 F)
1997
38.3 C (100.9 F)
1998
42.8 C (109.0 F)
1999
40.6 C (105.1 F)
2000
41.1 C (106.0 F)
2001
41.1 C (106.0 F)
2002
37.8 C (100.0 F)
2003
41.1 C (106.0 F)
2004
37.8 C (100.0 F)
2005
38.9 C (102.0 F)
2006
41.1 C (106.0 F)
2007
38.3 C (100.9 F)
2008
42.2 C (108.0 F)
2009
40.6 C (105.1 F)
2010
40.0 C (104.0 F)
2011
47.2 C (117.0 F)
2012
42.8 C (109.0 F)
2013
40.6 C (105.1 F)
2014
38.9 C (102.0 F)
2015
40.0 C (104.0 F)
2016
40.6 C (105.1 F)
2017
40.0 C (104.0 F)
2018
43.3 C (109.9 F)
Coldest night (TNn)
The coldest night of the year at Shamrock #2, 1962 to 2018. The record is -25.0 C (-13.0 F) in 1984, marked on the chart; the median year is -16.1 C (3.0 F).
Coldest night (TNn) at Shamrock #2 by year
Year
Coldest night (TNn)
1962
-12.8 C (9.0 F)
1963
-20.0 C (-4.0 F)
1964
-15.6 C (3.9 F)
1965
-16.1 C (3.0 F)
1966
-22.2 C (-8.0 F)
1967
-13.3 C (8.1 F)
1968
-16.1 C (3.0 F)
1969
-12.2 C (10.0 F)
1970
-15.0 C (5.0 F)
1971
-17.2 C (1.0 F)
1972
-17.2 C (1.0 F)
1973
-18.3 C (-0.9 F)
1974
-16.7 C (1.9 F)
1975
-14.4 C (6.1 F)
1976
-15.0 C (5.0 F)
1977
-18.3 C (-0.9 F)
1978
-15.6 C (3.9 F)
1979
-19.4 C (-2.9 F)
1980
-17.2 C (1.0 F)
1981
-18.3 C (-0.9 F)
1982
-17.2 C (1.0 F)
1983
-21.7 C (-7.1 F)
1984
-25.0 C (-13.0 F)
1985
-17.8 C (0.0 F)
1986
-18.9 C (-2.0 F)
1987
-16.7 C (1.9 F)
1988
-18.9 C (-2.0 F)
1989
-22.2 C (-8.0 F)
1990
-19.4 C (-2.9 F)
1991
-14.4 C (6.1 F)
1992
-10.6 C (12.9 F)
1993
-12.2 C (10.0 F)
1994
-17.8 C (0.0 F)
1995
-12.8 C (9.0 F)
1996
-20.6 C (-5.1 F)
1997
-14.4 C (6.1 F)
1998
-16.1 C (3.0 F)
1999
-10.6 C (12.9 F)
2000
-12.2 C (10.0 F)
2001
-10.0 C (14.0 F)
2002
-14.4 C (6.1 F)
2003
-15.0 C (5.0 F)
2004
-16.7 C (1.9 F)
2005
-17.2 C (1.0 F)
2006
-13.9 C (7.0 F)
2007
-15.6 C (3.9 F)
2008
-13.9 C (7.0 F)
2009
-14.4 C (6.1 F)
2010
-16.1 C (3.0 F)
2011
-21.1 C (-6.0 F)
2012
-13.3 C (8.1 F)
2013
-17.8 C (0.0 F)
2014
-16.7 C (1.9 F)
2015
-13.3 C (8.1 F)
2016
-17.2 C (1.0 F)
2017
-17.2 C (1.0 F)
2018
-16.1 C (3.0 F)
Wettest day (Rx1day)
The wettest day of the year at Shamrock #2, 1962 to 2018. The record is 209.3 mm (8.2 in) in 1995, marked on the chart; the median year is 56.6 mm (2.2 in).
Wettest day (Rx1day) at Shamrock #2 by year
Year
Wettest day (Rx1day)
1962
42.7 mm (1.7 in)
1963
18.3 mm (0.7 in)
1964
66.3 mm (2.6 in)
1965
56.6 mm (2.2 in)
1966
45.7 mm (1.8 in)
1967
85.6 mm (3.4 in)
1968
63.5 mm (2.5 in)
1969
57.7 mm (2.3 in)
1970
49.0 mm (1.9 in)
1971
46.2 mm (1.8 in)
1972
70.1 mm (2.8 in)
1973
62.2 mm (2.4 in)
1974
46.2 mm (1.8 in)
1975
45.7 mm (1.8 in)
1976
40.6 mm (1.6 in)
1977
63.5 mm (2.5 in)
1978
67.8 mm (2.7 in)
1979
47.0 mm (1.9 in)
1980
34.0 mm (1.3 in)
1981
44.5 mm (1.8 in)
1982
90.9 mm (3.6 in)
1983
44.5 mm (1.8 in)
1984
40.6 mm (1.6 in)
1985
53.3 mm (2.1 in)
1986
56.4 mm (2.2 in)
1987
36.8 mm (1.4 in)
1988
89.4 mm (3.5 in)
1989
61.0 mm (2.4 in)
1990
112.5 mm (4.4 in)
1991
129.3 mm (5.1 in)
1992
77.0 mm (3.0 in)
1993
51.8 mm (2.0 in)
1994
38.6 mm (1.5 in)
1995
209.3 mm (8.2 in)
1996
73.7 mm (2.9 in)
1997
76.7 mm (3.0 in)
1998
82.8 mm (3.3 in)
1999
38.9 mm (1.5 in)
2000
63.5 mm (2.5 in)
2001
143.5 mm (5.6 in)
2002
47.8 mm (1.9 in)
2003
125.0 mm (4.9 in)
2004
46.7 mm (1.8 in)
2005
63.5 mm (2.5 in)
2006
50.8 mm (2.0 in)
2007
49.0 mm (1.9 in)
2008
73.7 mm (2.9 in)
2009
68.1 mm (2.7 in)
2010
74.7 mm (2.9 in)
2011
33.0 mm (1.3 in)
2012
62.5 mm (2.5 in)
2013
47.0 mm (1.9 in)
2014
52.1 mm (2.1 in)
2015
116.8 mm (4.6 in)
2016
56.6 mm (2.2 in)
2017
57.2 mm (2.3 in)
2018
24.1 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Shamrock #2, 1962 to 2018. The record is 270.0 mm (10.6 in) in 1995, marked on the chart; the median year is 94.3 mm (3.7 in).
Wettest five days (Rx5day) at Shamrock #2 by year
Year
Wettest five days (Rx5day)
1962
70.3 mm (2.8 in)
1963
22.9 mm (0.9 in)
1964
106.5 mm (4.2 in)
1965
100.3 mm (3.9 in)
1966
103.4 mm (4.1 in)
1967
95.0 mm (3.7 in)
1968
67.1 mm (2.6 in)
1969
98.1 mm (3.9 in)
1970
81.0 mm (3.2 in)
1971
72.6 mm (2.9 in)
1972
98.3 mm (3.9 in)
1973
72.1 mm (2.8 in)
1974
89.7 mm (3.5 in)
1975
62.7 mm (2.5 in)
1976
75.4 mm (3.0 in)
1977
125.5 mm (4.9 in)
1978
126.0 mm (5.0 in)
1979
81.3 mm (3.2 in)
1980
53.8 mm (2.1 in)
1981
83.2 mm (3.3 in)
1982
105.7 mm (4.2 in)
1983
90.7 mm (3.6 in)
1984
52.1 mm (2.1 in)
1985
94.3 mm (3.7 in)
1986
66.8 mm (2.6 in)
1987
97.7 mm (3.8 in)
1988
108.5 mm (4.3 in)
1989
100.9 mm (4.0 in)
1990
120.1 mm (4.7 in)
1991
181.6 mm (7.1 in)
1992
82.6 mm (3.3 in)
1993
69.0 mm (2.7 in)
1994
56.4 mm (2.2 in)
1995
270.0 mm (10.6 in)
1996
87.4 mm (3.4 in)
1997
133.4 mm (5.3 in)
1998
162.3 mm (6.4 in)
1999
75.2 mm (3.0 in)
2000
105.5 mm (4.2 in)
2001
172.7 mm (6.8 in)
2002
104.1 mm (4.1 in)
2003
125.0 mm (4.9 in)
2004
103.1 mm (4.1 in)
2005
95.0 mm (3.7 in)
2006
94.5 mm (3.7 in)
2007
72.4 mm (2.9 in)
2008
131.4 mm (5.2 in)
2009
68.1 mm (2.7 in)
2010
113.0 mm (4.4 in)
2011
60.7 mm (2.4 in)
2012
70.4 mm (2.8 in)
2013
75.2 mm (3.0 in)
2014
63.5 mm (2.5 in)
2015
179.8 mm (7.1 in)
2016
56.6 mm (2.2 in)
2017
107.9 mm (4.2 in)
2018
51.4 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Shamrock #2, 1962 to 2018. The record is 78 days in 2000, marked on the chart; the median year is 38 days.
Longest dry spell (CDD) at Shamrock #2 by year
Year
Longest dry spell (CDD)
1962
37 days
1963
46 days
1964
39 days
1965
32 days
1966
52 days
1967
35 days
1968
35 days
1969
43 days
1970
49 days
1971
53 days
1972
74 days
1973
37 days
1974
36 days
1975
33 days
1976
47 days
1977
52 days
1978
45 days
1979
36 days
1980
32 days
1981
26 days
1982
30 days
1983
33 days
1984
39 days
1985
42 days
1986
36 days
1987
55 days
1988
54 days
1989
61 days
1990
36 days
1991
65 days
1992
71 days
1993
33 days
1994
40 days
1995
75 days
1996
43 days
1997
24 days
1998
34 days
1999
35 days
2000
78 days
2001
32 days
2002
29 days
2003
38 days
2004
33 days
2005
28 days
2006
56 days
2007
32 days
2008
46 days
2009
37 days
2010
34 days
2011
49 days
2012
44 days
2013
29 days
2014
53 days
2015
22 days
2016
24 days
2017
53 days
2018
47 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
40 years with a frost
Across 40 years with a frost, the median last spring frost at Shamrock #2 falls on 6 April and the median first autumn frost on 30 October, which leaves a median of 209 days between them.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
Frost dates and growing season at Shamrock #2
Measure
Median, all years
Earliest period
Recent period (1980 to 2016)
Recent against earliest
Fitted trend
Last spring frost
6 April
n/a
6 April
n/a
-2.3 days per decade
First autumn frost
30 October
n/a
30 October
n/a
-0.5 days per decade
Growing days
209 days
n/a
210 days
n/a
+1.8 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
51 years, 1966 to 2017
A day with at least 57.4 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 205.9 mm (8.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Shamrock #2: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
57.4 mm (2.3 in)
5 years
81.0 mm (3.2 in)
10 years
101.7 mm (4.0 in)
25 years
135.3 mm (5.3 in)
50 years
167.1 mm (6.6 in)
100 years
205.9 mm (8.1 in)
Longer than the 51 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, 51 years of values from 1966 to 2017.
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: 209.3 mm (8.2 in) in 1995; 143.5 mm (5.6 in) in 2001; 129.3 mm (5.1 in) in 1991.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Shamrock #2 standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Shamrock #2 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.