Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Rancho Williams. 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 Rancho Williams, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
35.6 C (96.1 F)
-5.0 C (23.0 F)
n/a
n/a
Feb
36.7 C (98.1 F)
-5.0 C (23.0 F)
n/a
n/a
Mar
45.0 C (113.0 F)
0.0 C (32.0 F)
n/a
n/a
Apr
46.7 C (116.1 F)
1.7 C (35.1 F)
n/a
n/a
May
48.9 C (120.0 F)
3.9 C (39.0 F)
n/a
n/a
Jun
50.0 C (122.0 F)
10.0 C (50.0 F)
n/a
n/a
Jul
51.7 C (125.1 F)
10.0 C (50.0 F)
n/a
n/a
Aug
50.0 C (122.0 F)
13.9 C (57.0 F)
n/a
n/a
Sep
48.9 C (120.0 F)
10.0 C (50.0 F)
n/a
n/a
Oct
45.6 C (114.1 F)
1.7 C (35.1 F)
n/a
n/a
Nov
41.7 C (107.1 F)
-4.4 C (24.1 F)
n/a
n/a
Dec
30.6 C (87.1 F)
-5.0 C (23.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rancho Williams still stand. 1985 holds the most, with 100.
Standing records at Rancho Williams by the year they were set
Year set
Standing records
1982
72
1983
52
1984
47
1985
100
1986
52
1987
58
1988
19
1989
51
1990
58
1991
63
1992
43
1993
29
1994
43
1995
26
1996
100
1997
35
1998
22
1999
95
2000
49
2001
34
2002
23
2003
69
2004
28
2005
28
2006
32
2007
52
2008
23
2009
21
2010
72
2011
60
2012
8
Wettest Day of Each Month
Aug: 64.8 mm (2.6 in)
The wettest day on record for each calendar month at Rancho Williams. The most was 64.8 mm (2.6 in) on 2 August 2005.
Record daily precipitation for each month at Rancho Williams
Month
Record daily precipitation (mm)
Date
Jan
32.8 mm (1.3 in)
20 January 2010
Feb
15.5 mm (0.6 in)
14 February 2003
Mar
41.4 mm (1.6 in)
6 March 2001
Apr
19.3 mm (0.8 in)
2 April 1999
May
7.9 mm (0.31 in)
4 May 1992
Jun
15.7 mm (0.6 in)
5 June 1997
Jul
57.2 mm (2.3 in)
29 July 1999
Aug
64.8 mm (2.6 in)
2 August 2005
Sep
33.3 mm (1.3 in)
13 September 1997
Oct
25.9 mm (1.0 in)
22 October 2000
Nov
29.0 mm (1.1 in)
30 November 2007
Dec
35.3 mm (1.4 in)
8 December 1982
Period of Record Coverage
1982 to 2012
Complete yearUnder 90 percent of days
31 years of record at Rancho Williams, 1982 to 2012. 6 years have data for under 90 percent of days and are left out of rankings: 1988, 1994, 1995, 2002, 2005, 2012.
Cooler than the station meanWarmer than the station mean
One stripe for each of 20 complete years at Rancho Williams, 1982 to 2010. Blue stripes are years cooler than the station's own mean of 22.7 C (72.9 F); red stripes are warmer. The coolest year was 1982, at 21.6 C (70.9 F), and the warmest was 1996, at 24.0 C (75.1 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Rancho Williams as warming stripes, 1982 to 2010
Year
Annual mean temperature
Difference from the station mean
1982
21.6 C
-1.14 C
1983
22.3 C
-0.44 C
1984
22.5 C
-0.24 C
1985
22.9 C
+0.14 C
1986
23.0 C
+0.25 C
1989
23.1 C
+0.35 C
1990
22.7 C
-0.03 C
1991
22.6 C
-0.15 C
1992
22.9 C
+0.16 C
1993
22.7 C
-0.01 C
1996
24.0 C
+1.24 C
1999
23.4 C
+0.63 C
2000
22.8 C
+0.05 C
2001
22.1 C
-0.67 C
2004
22.3 C
-0.42 C
2006
23.0 C
+0.28 C
2007
22.9 C
+0.20 C
2008
23.0 C
+0.26 C
2009
22.5 C
-0.28 C
2010
22.7 C
-0.08 C
This station does not have enough complete years (30 are needed) to fit a temperature trend.
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
1982 to 2012
Yearly extremes at Rancho Williams: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
51.7 C (125.1 F)
1995
47.8 C (118.0 F)
31
Coldest night (TNn)
-5.0 C (23.0 F)
1990
-2.2 C (28.0 F)
31
Wettest day (Rx1day)
64.8 mm (2.6 in)
2005
19.6 mm (0.8 in)
31
Wettest five days (Rx5day)
68.7 mm (2.7 in)
2010
19.6 mm (0.8 in)
31
Longest dry spell (CDD)
327 days
2009
155 days
31
Hottest day (TXx)
The hottest day of the year at Rancho Williams, 1982 to 2012. The record is 51.7 C (125.1 F) in 1995, marked on the chart; the median year is 47.8 C (118.0 F).
Hottest day (TXx) at Rancho Williams by year
Year
Hottest day (TXx)
1982
46.7 C (116.1 F)
1983
46.7 C (116.1 F)
1984
47.8 C (118.0 F)
1985
50.0 C (122.0 F)
1986
47.8 C (118.0 F)
1987
48.9 C (120.0 F)
1988
45.6 C (114.1 F)
1989
46.7 C (116.1 F)
1990
50.0 C (122.0 F)
1991
48.9 C (120.0 F)
1992
47.8 C (118.0 F)
1993
50.0 C (122.0 F)
1994
50.0 C (122.0 F)
1995
51.7 C (125.1 F)
1996
47.8 C (118.0 F)
1997
46.7 C (116.1 F)
1998
47.8 C (118.0 F)
1999
47.8 C (118.0 F)
2000
47.8 C (118.0 F)
2001
45.6 C (114.1 F)
2002
45.6 C (114.1 F)
2003
47.8 C (118.0 F)
2004
45.6 C (114.1 F)
2005
46.7 C (116.1 F)
2006
45.6 C (114.1 F)
2007
48.9 C (120.0 F)
2008
46.7 C (116.1 F)
2009
47.8 C (118.0 F)
2010
47.8 C (118.0 F)
2011
47.8 C (118.0 F)
2012
45.0 C (113.0 F)
Coldest night (TNn)
The coldest night of the year at Rancho Williams, 1982 to 2012. The record is -5.0 C (23.0 F) in 1990, marked on the chart; the median year is -2.2 C (28.0 F).
Coldest night (TNn) at Rancho Williams by year
Year
Coldest night (TNn)
1982
0.0 C (32.0 F)
1983
0.6 C (33.1 F)
1984
0.0 C (32.0 F)
1985
-2.2 C (28.0 F)
1986
1.7 C (35.1 F)
1987
0.0 C (32.0 F)
1988
-2.2 C (28.0 F)
1989
-2.2 C (28.0 F)
1990
-5.0 C (23.0 F)
1991
-4.4 C (24.1 F)
1992
-2.2 C (28.0 F)
1993
-4.4 C (24.1 F)
1994
-4.4 C (24.1 F)
1995
-1.1 C (30.0 F)
1996
0.6 C (33.1 F)
1997
-1.1 C (30.0 F)
1998
0.0 C (32.0 F)
1999
-5.0 C (23.0 F)
2000
-4.4 C (24.1 F)
2001
0.0 C (32.0 F)
2002
0.6 C (33.1 F)
2003
-2.2 C (28.0 F)
2004
-3.3 C (26.1 F)
2005
0.0 C (32.0 F)
2006
-3.3 C (26.1 F)
2007
-5.0 C (23.0 F)
2008
-2.2 C (28.0 F)
2009
-2.2 C (28.0 F)
2010
-4.4 C (24.1 F)
2011
-5.0 C (23.0 F)
2012
5.0 C (41.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rancho Williams, 1982 to 2012. The record is 64.8 mm (2.6 in) in 2005, marked on the chart; the median year is 19.6 mm (0.8 in).
Wettest day (Rx1day) at Rancho Williams by year
Year
Wettest day (Rx1day)
1982
35.3 mm (1.4 in)
1983
47.0 mm (1.9 in)
1984
15.2 mm (0.6 in)
1985
10.4 mm (0.4 in)
1986
19.3 mm (0.8 in)
1987
19.6 mm (0.8 in)
1988
1.8 mm (0.07 in)
1989
10.9 mm (0.4 in)
1990
3.0 mm (0.12 in)
1991
14.0 mm (0.6 in)
1992
19.6 mm (0.8 in)
1993
19.8 mm (0.8 in)
1994
19.8 mm (0.8 in)
1995
23.9 mm (0.9 in)
1996
5.8 mm (0.23 in)
1997
33.3 mm (1.3 in)
1998
13.0 mm (0.5 in)
1999
57.2 mm (2.3 in)
2000
25.9 mm (1.0 in)
2001
41.4 mm (1.6 in)
2002
11.4 mm (0.4 in)
2003
15.5 mm (0.6 in)
2004
21.3 mm (0.8 in)
2005
64.8 mm (2.6 in)
2006
26.4 mm (1.0 in)
2007
29.0 mm (1.1 in)
2008
9.9 mm (0.39 in)
2009
7.6 mm (0.30 in)
2010
32.8 mm (1.3 in)
2011
11.9 mm (0.5 in)
2012
6.1 mm (0.24 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rancho Williams, 1982 to 2012. The record is 68.7 mm (2.7 in) in 2010, marked on the chart; the median year is 19.6 mm (0.8 in).
Wettest five days (Rx5day) at Rancho Williams by year
Year
Wettest five days (Rx5day)
1982
63.5 mm (2.5 in)
1983
50.7 mm (2.0 in)
1984
19.3 mm (0.8 in)
1985
11.2 mm (0.4 in)
1986
19.3 mm (0.8 in)
1987
21.9 mm (0.9 in)
1988
1.8 mm (0.07 in)
1989
11.7 mm (0.5 in)
1990
3.0 mm (0.12 in)
1991
14.0 mm (0.6 in)
1992
19.6 mm (0.8 in)
1993
35.8 mm (1.4 in)
1994
39.9 mm (1.6 in)
1995
24.2 mm (1.0 in)
1996
5.8 mm (0.23 in)
1997
34.6 mm (1.4 in)
1998
16.0 mm (0.6 in)
1999
57.2 mm (2.3 in)
2000
26.2 mm (1.0 in)
2001
45.8 mm (1.8 in)
2002
11.4 mm (0.4 in)
2003
15.5 mm (0.6 in)
2004
22.1 mm (0.9 in)
2005
66.6 mm (2.6 in)
2006
27.7 mm (1.1 in)
2007
58.0 mm (2.3 in)
2008
14.0 mm (0.6 in)
2009
7.6 mm (0.30 in)
2010
68.7 mm (2.7 in)
2011
11.9 mm (0.5 in)
2012
6.1 mm (0.24 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rancho Williams, 1982 to 2012. The record is 327 days in 2009, marked on the chart; the median year is 155 days.
Longest dry spell (CDD) at Rancho Williams by year
Year
Longest dry spell (CDD)
1982
105 days
1983
155 days
1984
105 days
1985
155 days
1986
196 days
1987
148 days
1988
134 days
1989
157 days
1990
257 days
1991
242 days
1992
131 days
1993
223 days
1994
193 days
1995
99 days
1996
174 days
1997
63 days
1998
246 days
1999
99 days
2000
211 days
2001
85 days
2002
120 days
2003
172 days
2004
200 days
2005
86 days
2006
115 days
2007
105 days
2008
192 days
2009
327 days
2010
125 days
2011
198 days
2012
192 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.
Download the Data
Data for Rancho Williams standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rancho Williams 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.