Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at San Juanillo. 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 San Juanillo, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
38.9 C (102.0 F)
5.0 C (41.0 F)
n/a
n/a
Feb
40.0 C (104.0 F)
5.0 C (41.0 F)
n/a
n/a
Mar
41.7 C (107.1 F)
7.8 C (46.0 F)
n/a
n/a
Apr
45.0 C (113.0 F)
7.8 C (46.0 F)
n/a
n/a
May
45.0 C (113.0 F)
12.8 C (55.0 F)
n/a
n/a
Jun
45.6 C (114.1 F)
10.6 C (51.1 F)
n/a
n/a
Jul
45.0 C (113.0 F)
15.6 C (60.1 F)
n/a
n/a
Aug
40.6 C (105.1 F)
15.0 C (59.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
13.9 C (57.0 F)
n/a
n/a
Oct
40.0 C (104.0 F)
10.6 C (51.1 F)
n/a
n/a
Nov
38.9 C (102.0 F)
3.9 C (39.0 F)
n/a
n/a
Dec
37.8 C (100.0 F)
5.0 C (41.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at San Juanillo still stand. 2010 holds the most, with 65.
Standing records at San Juanillo by the year they were set
Year set
Standing records
1956
17
1957
28
1958
18
1959
12
1960
28
1961
16
1962
11
1963
45
1964
32
1965
25
1966
31
1967
17
1968
17
1969
30
1970
27
1971
15
1972
23
1973
29
1974
23
1975
5
1976
7
1977
18
1978
16
1979
19
1980
25
1981
11
1982
12
1983
12
1984
36
1985
6
1986
27
1989
32
1990
22
1991
41
1992
22
1993
20
1994
40
1995
44
1996
34
1997
31
1998
34
1999
34
2000
34
2001
36
2002
32
2004
44
2005
17
2006
31
2007
60
2008
39
2009
54
2010
65
2011
60
All-Time Record Progression
7 new records
7 all-time records were set at San Juanillo between 21 June 1986 and 29 November 2011. Each dot is a new record.
When San Juanillo set new all-time records
Date
Kind
Detail
1986-06-21
Record high minimum temperature
Record high minimum temperature 30.6 C (87.1 F)
1991-05-03
Record high maximum temperature
Record high maximum temperature 43.3 C (109.9 F)
1991-05-04
Record high maximum temperature
Record high maximum temperature 43.9 C (111.0 F)
1991-06-01
Record high maximum temperature
Record high maximum temperature 45.6 C (114.1 F)
2010-01-10
Record low maximum temperature
Record low maximum temperature 13.9 C (57.0 F)
2010-09-27
Record daily precipitation
Record daily precipitation 242.1 mm (9.5 in)
2011-11-29
Record low minimum temperature
Record low minimum temperature 3.9 C (39.0 F)
Wettest Day of Each Month
Sep: 242.1 mm (9.5 in)
The wettest day on record for each calendar month at San Juanillo. The most was 242.1 mm (9.5 in) on 27 September 2010.
Record daily precipitation for each month at San Juanillo
Month
Record daily precipitation (mm)
Date
Jan
46.2 mm (1.8 in)
14 January 1976
Feb
48.3 mm (1.9 in)
21 February 1965
Mar
67.6 mm (2.7 in)
29 March 2004
Apr
62.2 mm (2.4 in)
27 April 2004
May
91.4 mm (3.6 in)
30 May 1989
Jun
120.9 mm (4.8 in)
1 June 1992
Jul
201.4 mm (7.9 in)
29 July 1980
Aug
187.5 mm (7.4 in)
8 August 1986
Sep
242.1 mm (9.5 in)
27 September 2010
Oct
179.8 mm (7.1 in)
20 October 1995
Nov
102.4 mm (4.0 in)
5 November 1961
Dec
56.9 mm (2.2 in)
9 December 1995
Period of Record Coverage
1956 to 2011
Complete yearUnder 90 percent of days
54 years of record at San Juanillo, 1956 to 2011. 7 years have data for under 90 percent of days and are left out of rankings: 1956, 1969, 1987, 1989, 1991, 2008, 2009.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at San Juanillo, 1957 to 2011. Blue stripes are years cooler than the station's own mean of 25.9 C (78.6 F); red stripes are warmer. The coolest year was 2000, at 24.0 C (75.1 F), and the warmest was 1995, at 27.9 C (82.1 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at San Juanillo as warming stripes, 1957 to 2011
Year
Annual mean temperature
Difference from the station mean
1957
25.2 C
-0.67 C
1958
25.4 C
-0.46 C
1959
25.4 C
-0.50 C
1960
25.4 C
-0.47 C
1961
25.8 C
-0.11 C
1962
25.7 C
-0.15 C
1963
25.5 C
-0.44 C
1964
25.7 C
-0.16 C
1965
25.6 C
-0.25 C
1966
25.2 C
-0.68 C
1967
25.7 C
-0.16 C
1968
25.6 C
-0.30 C
1970
25.7 C
-0.15 C
1971
26.4 C
+0.46 C
1972
26.3 C
+0.45 C
1973
26.7 C
+0.80 C
1974
25.8 C
-0.08 C
1976
25.4 C
-0.45 C
1977
26.1 C
+0.25 C
1978
25.6 C
-0.27 C
1979
25.6 C
-0.32 C
1980
26.0 C
+0.13 C
1981
25.7 C
-0.20 C
1982
26.4 C
+0.48 C
1983
26.2 C
+0.31 C
1984
25.9 C
+0.04 C
1985
26.5 C
+0.64 C
1986
26.7 C
+0.81 C
1992
26.8 C
+0.91 C
1993
27.2 C
+1.32 C
1994
27.8 C
+1.87 C
1995
27.9 C
+1.97 C
1996
26.9 C
+1.04 C
1997
27.0 C
+1.08 C
1998
27.4 C
+1.51 C
1999
25.0 C
-0.93 C
2000
24.0 C
-1.94 C
2001
24.0 C
-1.91 C
2004
24.1 C
-1.75 C
2005
25.2 C
-0.72 C
2010
25.2 C
-0.70 C
2011
25.7 C
-0.23 C
The fitted trend in annual mean temperature here over 1957 to 2011 is 0.04 C (-0.14 to 0.22) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.4) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at San Juanillo
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.04 C (-0.14 to 0.22) per decade
0.1 F (-0.3 to 0.4) per decade
1957 to 2011
42
Not clearly different from zero
Mean daily maximum
0.3 C (0.2 to 0.5) per decade
0.6 F (0.3 to 1.0) per decade
1957 to 2011
42
Rise
Mean daily minimum
-0.27 C (-0.53 to -0.01) per decade
-0.48 F (-0.96 to -0.01) per decade
1957 to 2011
42
Fall
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
1956 to 2011
Yearly extremes at San Juanillo: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
45.6 C (114.1 F)
1991
40.6 C (105.1 F)
54
Coldest night (TNn)
3.9 C (39.0 F)
2011
10.0 C (50.0 F)
54
Wettest day (Rx1day)
242.1 mm (9.5 in)
2010
90.6 mm (3.6 in)
54
Wettest five days (Rx5day)
399.1 mm (15.7 in)
2010
163.3 mm (6.4 in)
54
Longest dry spell (CDD)
72 days
1996
36 days
54
Hottest day (TXx)
The hottest day of the year at San Juanillo, 1956 to 2011. The record is 45.6 C (114.1 F) in 1991, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at San Juanillo by year
Year
Hottest day (TXx)
1956
35.0 C (95.0 F)
1957
40.0 C (104.0 F)
1958
40.6 C (105.1 F)
1959
38.9 C (102.0 F)
1960
40.6 C (105.1 F)
1961
41.7 C (107.1 F)
1962
40.6 C (105.1 F)
1963
38.9 C (102.0 F)
1964
40.6 C (105.1 F)
1965
40.0 C (104.0 F)
1966
38.9 C (102.0 F)
1967
40.0 C (104.0 F)
1968
38.9 C (102.0 F)
1969
40.6 C (105.1 F)
1970
40.0 C (104.0 F)
1971
40.6 C (105.1 F)
1972
40.0 C (104.0 F)
1973
40.6 C (105.1 F)
1974
40.0 C (104.0 F)
1975
41.7 C (107.1 F)
1976
40.0 C (104.0 F)
1977
40.0 C (104.0 F)
1978
40.0 C (104.0 F)
1979
40.0 C (104.0 F)
1980
41.7 C (107.1 F)
1981
40.0 C (104.0 F)
1982
40.0 C (104.0 F)
1983
41.7 C (107.1 F)
1984
42.8 C (109.0 F)
1985
40.6 C (105.1 F)
1986
42.2 C (108.0 F)
1987
36.7 C (98.1 F)
1989
42.8 C (109.0 F)
1990
41.7 C (107.1 F)
1991
45.6 C (114.1 F)
1992
40.6 C (105.1 F)
1993
43.9 C (111.0 F)
1994
42.8 C (109.0 F)
1995
43.9 C (111.0 F)
1996
45.6 C (114.1 F)
1997
41.7 C (107.1 F)
1998
43.9 C (111.0 F)
1999
41.7 C (107.1 F)
2000
38.9 C (102.0 F)
2001
37.8 C (100.0 F)
2002
40.0 C (104.0 F)
2004
38.9 C (102.0 F)
2005
43.9 C (111.0 F)
2006
40.6 C (105.1 F)
2007
45.0 C (113.0 F)
2008
45.0 C (113.0 F)
2009
45.0 C (113.0 F)
2010
45.6 C (114.1 F)
2011
43.9 C (111.0 F)
Coldest night (TNn)
The coldest night of the year at San Juanillo, 1956 to 2011. The record is 3.9 C (39.0 F) in 2011, marked on the chart; the median year is 10.0 C (50.0 F).
Coldest night (TNn) at San Juanillo by year
Year
Coldest night (TNn)
1956
10.6 C (51.1 F)
1957
8.9 C (48.0 F)
1958
6.7 C (44.1 F)
1959
10.6 C (51.1 F)
1960
5.0 C (41.0 F)
1961
10.0 C (50.0 F)
1962
10.6 C (51.1 F)
1963
5.0 C (41.0 F)
1964
10.6 C (51.1 F)
1965
10.0 C (50.0 F)
1966
8.9 C (48.0 F)
1967
6.7 C (44.1 F)
1968
10.0 C (50.0 F)
1969
11.7 C (53.1 F)
1970
7.8 C (46.0 F)
1971
10.0 C (50.0 F)
1972
10.6 C (51.1 F)
1973
10.0 C (50.0 F)
1974
11.7 C (53.1 F)
1975
10.6 C (51.1 F)
1976
11.7 C (53.1 F)
1977
10.0 C (50.0 F)
1978
11.7 C (53.1 F)
1979
10.0 C (50.0 F)
1980
8.9 C (48.0 F)
1981
11.7 C (53.1 F)
1982
11.7 C (53.1 F)
1983
11.7 C (53.1 F)
1984
11.7 C (53.1 F)
1985
12.2 C (54.0 F)
1986
8.9 C (48.0 F)
1987
9.4 C (48.9 F)
1989
8.9 C (48.0 F)
1990
11.1 C (52.0 F)
1991
10.6 C (51.1 F)
1992
11.7 C (53.1 F)
1993
12.8 C (55.0 F)
1994
10.6 C (51.1 F)
1995
11.7 C (53.1 F)
1996
8.9 C (48.0 F)
1997
5.0 C (41.0 F)
1998
7.8 C (46.0 F)
1999
8.9 C (48.0 F)
2000
7.8 C (46.0 F)
2001
7.8 C (46.0 F)
2002
5.6 C (42.1 F)
2004
10.0 C (50.0 F)
2005
8.9 C (48.0 F)
2006
5.6 C (42.1 F)
2007
7.2 C (45.0 F)
2008
7.8 C (46.0 F)
2009
6.7 C (44.1 F)
2010
5.0 C (41.0 F)
2011
3.9 C (39.0 F)
Wettest day (Rx1day)
The wettest day of the year at San Juanillo, 1956 to 2011. The record is 242.1 mm (9.5 in) in 2010, marked on the chart; the median year is 90.6 mm (3.6 in).
Wettest day (Rx1day) at San Juanillo by year
Year
Wettest day (Rx1day)
1956
51.8 mm (2.0 in)
1957
82.6 mm (3.3 in)
1958
96.0 mm (3.8 in)
1959
65.0 mm (2.6 in)
1960
68.6 mm (2.7 in)
1961
102.4 mm (4.0 in)
1962
46.0 mm (1.8 in)
1963
143.3 mm (5.6 in)
1964
85.6 mm (3.4 in)
1965
75.2 mm (3.0 in)
1966
99.8 mm (3.9 in)
1967
111.0 mm (4.4 in)
1968
70.9 mm (2.8 in)
1969
68.1 mm (2.7 in)
1970
59.9 mm (2.4 in)
1971
130.3 mm (5.1 in)
1972
112.3 mm (4.4 in)
1973
92.5 mm (3.6 in)
1974
169.2 mm (6.7 in)
1975
61.5 mm (2.4 in)
1976
129.8 mm (5.1 in)
1977
59.4 mm (2.3 in)
1978
95.0 mm (3.7 in)
1979
88.6 mm (3.5 in)
1980
201.4 mm (7.9 in)
1981
96.3 mm (3.8 in)
1982
77.0 mm (3.0 in)
1983
114.3 mm (4.5 in)
1984
102.1 mm (4.0 in)
1985
61.5 mm (2.4 in)
1986
187.5 mm (7.4 in)
1987
1.8 mm (0.07 in)
1989
99.8 mm (3.9 in)
1990
59.9 mm (2.4 in)
1991
94.0 mm (3.7 in)
1992
120.9 mm (4.8 in)
1993
70.6 mm (2.8 in)
1994
40.9 mm (1.6 in)
1995
179.8 mm (7.1 in)
1996
94.5 mm (3.7 in)
1997
104.9 mm (4.1 in)
1998
47.8 mm (1.9 in)
1999
138.9 mm (5.5 in)
2000
116.8 mm (4.6 in)
2001
119.9 mm (4.7 in)
2002
70.4 mm (2.8 in)
2004
129.0 mm (5.1 in)
2005
74.9 mm (2.9 in)
2006
71.9 mm (2.8 in)
2007
52.1 mm (2.1 in)
2008
84.3 mm (3.3 in)
2009
63.0 mm (2.5 in)
2010
242.1 mm (9.5 in)
2011
61.5 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Juanillo, 1956 to 2011. The record is 399.1 mm (15.7 in) in 2010, marked on the chart; the median year is 163.3 mm (6.4 in).
Wettest five days (Rx5day) at San Juanillo by year
Year
Wettest five days (Rx5day)
1956
123.5 mm (4.9 in)
1957
158.6 mm (6.2 in)
1958
170.5 mm (6.7 in)
1959
124.6 mm (4.9 in)
1960
199.9 mm (7.9 in)
1961
168.5 mm (6.6 in)
1962
101.8 mm (4.0 in)
1963
229.6 mm (9.0 in)
1964
160.6 mm (6.3 in)
1965
135.9 mm (5.4 in)
1966
171.1 mm (6.7 in)
1967
154.2 mm (6.1 in)
1968
173.5 mm (6.8 in)
1969
151.9 mm (6.0 in)
1970
168.9 mm (6.6 in)
1971
226.1 mm (8.9 in)
1972
152.0 mm (6.0 in)
1973
179.3 mm (7.1 in)
1974
265.5 mm (10.5 in)
1975
104.9 mm (4.1 in)
1976
168.7 mm (6.6 in)
1977
127.8 mm (5.0 in)
1978
147.3 mm (5.8 in)
1979
187.5 mm (7.4 in)
1980
269.7 mm (10.6 in)
1981
258.4 mm (10.2 in)
1982
148.6 mm (5.9 in)
1983
132.8 mm (5.2 in)
1984
194.1 mm (7.6 in)
1985
133.6 mm (5.3 in)
1986
241.3 mm (9.5 in)
1987
30.8 mm (1.2 in)
1989
282.2 mm (11.1 in)
1990
97.1 mm (3.8 in)
1991
120.2 mm (4.7 in)
1992
202.0 mm (8.0 in)
1993
148.9 mm (5.9 in)
1994
81.9 mm (3.2 in)
1995
180.1 mm (7.1 in)
1996
218.4 mm (8.6 in)
1997
190.8 mm (7.5 in)
1998
99.1 mm (3.9 in)
1999
286.0 mm (11.3 in)
2000
165.9 mm (6.5 in)
2001
222.9 mm (8.8 in)
2002
120.2 mm (4.7 in)
2004
135.4 mm (5.3 in)
2005
132.9 mm (5.2 in)
2006
200.4 mm (7.9 in)
2007
108.3 mm (4.3 in)
2008
184.9 mm (7.3 in)
2009
121.2 mm (4.8 in)
2010
399.1 mm (15.7 in)
2011
111.8 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Juanillo, 1956 to 2011. The record is 72 days in 1996, marked on the chart; the median year is 36 days.
Longest dry spell (CDD) at San Juanillo by year
Year
Longest dry spell (CDD)
1956
13 days
1957
28 days
1958
48 days
1959
60 days
1960
42 days
1961
37 days
1962
41 days
1963
38 days
1964
31 days
1965
36 days
1966
26 days
1967
35 days
1968
31 days
1969
23 days
1970
60 days
1971
35 days
1972
43 days
1973
64 days
1974
21 days
1975
38 days
1976
37 days
1977
62 days
1978
19 days
1979
27 days
1980
50 days
1981
30 days
1982
50 days
1983
64 days
1984
66 days
1985
30 days
1986
37 days
1987
47 days
1989
35 days
1990
30 days
1991
69 days
1992
45 days
1993
33 days
1994
27 days
1995
42 days
1996
72 days
1997
35 days
1998
57 days
1999
32 days
2000
34 days
2001
61 days
2002
23 days
2004
31 days
2005
64 days
2006
39 days
2007
26 days
2008
20 days
2009
15 days
2010
32 days
2011
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.
Rainfall Return Levels
47 years, 1957 to 2011
A day with at least 89.9 mm (3.5 in) of rain is expected about once in 2 years. A day with at least 258.1 mm (10.2 in) of rain is expected about once in 100 years.
Rainfall return levels at San Juanillo: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
89.9 mm (3.5 in)
5 years
127.6 mm (5.0 in)
10 years
155.2 mm (6.1 in)
25 years
193.6 mm (7.6 in)
50 years
224.7 mm (8.8 in)
Longer than the 47 years of record
100 years
258.1 mm (10.2 in)
Longer than the 47 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, 47 years of values from 1957 to 2011.
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: 242.1 mm (9.5 in) in 2010; 201.4 mm (7.9 in) in 1980; 187.5 mm (7.4 in) in 1986.
Station Changes
1 suspected
One change was suspected in the annual mean temperature of San Juanillo, at 1999. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1999 ran 0.8 C (1.5 F) lower than in the years before (possible change).
Suspected changes in the annual mean temperature at San Juanillo, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1999
-0.8
-1.5
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 San Juanillo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Juanillo 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.