Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Los Altares. 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 Los Altares, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
26.7 C (80.1 F)
-16.1 C (3.0 F)
n/a
n/a
Feb
26.7 C (80.1 F)
-15.6 C (3.9 F)
n/a
n/a
Mar
28.9 C (84.0 F)
-13.3 C (8.1 F)
n/a
n/a
Apr
30.6 C (87.1 F)
-12.2 C (10.0 F)
n/a
n/a
May
33.3 C (91.9 F)
-8.3 C (17.1 F)
n/a
n/a
Jun
33.9 C (93.0 F)
-5.0 C (23.0 F)
n/a
n/a
Jul
30.6 C (87.1 F)
0.0 C (32.0 F)
n/a
n/a
Aug
30.0 C (86.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
28.3 C (82.9 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-11.7 C (10.9 F)
n/a
n/a
Nov
27.8 C (82.0 F)
-17.2 C (1.0 F)
n/a
n/a
Dec
25.6 C (78.1 F)
-16.1 C (3.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Los Altares still stand. 1974 holds the most, with 104.
Standing records at Los Altares by the year they were set
Year set
Standing records
1973
28
1974
104
1975
24
1976
43
1977
26
1978
32
1979
67
1980
54
1981
55
1982
30
1983
38
1984
3
1985
39
1986
38
1987
43
1988
31
1989
45
1990
31
1991
37
1992
32
1993
18
1994
20
1995
40
1996
35
1997
54
1998
54
1999
36
2000
44
2001
23
2002
5
2003
23
2004
22
2005
42
2006
15
2007
31
2008
62
2009
43
2010
28
2011
41
2012
28
All-Time Record Progression
1 new records
1 all-time records were set at Los Altares between 21 November 2009 and 21 November 2009. Each dot is a new record.
When Los Altares set new all-time records
Date
Kind
Detail
2009-11-21
Record low minimum temperature
Record low minimum temperature -17.2 C (1.0 F)
Wettest Day of Each Month
Nov: 86.4 mm (3.4 in)
The wettest day on record for each calendar month at Los Altares. The most was 86.4 mm (3.4 in) on 26 November 1982.
Record daily precipitation for each month at Los Altares
Month
Record daily precipitation (mm)
Date
Jan
80.3 mm (3.2 in)
26 January 1979
Feb
74.9 mm (2.9 in)
17 February 2010
Mar
69.9 mm (2.8 in)
4 March 1983
Apr
60.5 mm (2.4 in)
3 April 1997
May
31.0 mm (1.2 in)
17 May 2009
Jun
67.8 mm (2.7 in)
12 June 2007
Jul
62.0 mm (2.4 in)
24 July 1980
Aug
54.4 mm (2.1 in)
10 August 1987
Sep
54.9 mm (2.2 in)
1 September 2011
Oct
81.8 mm (3.2 in)
12 October 1986
Nov
86.4 mm (3.4 in)
26 November 1982
Dec
65.8 mm (2.6 in)
25 December 1974
Period of Record Coverage
1973 to 2012
Complete yearUnder 90 percent of days
40 years of record at Los Altares, 1973 to 2012. 9 years have data for under 90 percent of days and are left out of rankings: 1973, 1974, 1984, 2000, 2001, 2002, 2003, 2004 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 24 complete years at Los Altares, 1975 to 2011. Blue stripes are years cooler than the station's own mean of 10.2 C (50.4 F); red stripes are warmer. The coolest year was 2011, at 8.9 C (47.9 F), and the warmest was 1994, at 11.0 C (51.8 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Los Altares as warming stripes, 1975 to 2011
Year
Annual mean temperature
Difference from the station mean
1975
9.7 C
-0.48 C
1976
9.5 C
-0.69 C
1978
10.3 C
+0.09 C
1979
10.1 C
-0.07 C
1981
10.9 C
+0.66 C
1982
10.8 C
+0.57 C
1983
10.1 C
-0.11 C
1985
10.2 C
+0.03 C
1986
10.5 C
+0.25 C
1987
9.9 C
-0.31 C
1988
10.1 C
-0.07 C
1989
10.5 C
+0.31 C
1990
10.6 C
+0.39 C
1991
10.4 C
+0.18 C
1992
10.0 C
-0.17 C
1993
10.6 C
+0.39 C
1994
11.0 C
+0.77 C
1996
10.4 C
+0.23 C
1997
10.1 C
-0.12 C
1999
10.4 C
+0.21 C
2005
10.6 C
+0.40 C
2008
9.2 C
-1.06 C
2009
10.2 C
-0.02 C
2011
8.9 C
-1.35 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
1973 to 2012
Yearly extremes at Los Altares: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
33.9 C (93.0 F)
1980
30.0 C (86.0 F)
40
Coldest night (TNn)
-17.2 C (1.0 F)
2009
-12.2 C (10.0 F)
40
Wettest day (Rx1day)
86.4 mm (3.4 in)
1982
49.3 mm (1.9 in)
40
Wettest five days (Rx5day)
201.8 mm (7.9 in)
1979
96.4 mm (3.8 in)
40
Longest dry spell (CDD)
162 days
2011
56 days
40
Hottest day (TXx)
The hottest day of the year at Los Altares, 1973 to 2012. The record is 33.9 C (93.0 F) in 1980, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Los Altares by year
Year
Hottest day (TXx)
1973
30.0 C (86.0 F)
1974
25.6 C (78.1 F)
1975
30.0 C (86.0 F)
1976
27.8 C (82.0 F)
1977
28.9 C (84.0 F)
1978
30.0 C (86.0 F)
1979
30.6 C (87.1 F)
1980
33.9 C (93.0 F)
1981
31.7 C (89.1 F)
1982
32.8 C (91.0 F)
1983
28.9 C (84.0 F)
1984
22.8 C (73.0 F)
1985
30.0 C (86.0 F)
1986
28.9 C (84.0 F)
1987
30.0 C (86.0 F)
1988
28.9 C (84.0 F)
1989
33.3 C (91.9 F)
1990
30.0 C (86.0 F)
1991
30.0 C (86.0 F)
1992
31.1 C (88.0 F)
1993
28.9 C (84.0 F)
1994
30.0 C (86.0 F)
1995
30.6 C (87.1 F)
1996
30.0 C (86.0 F)
1997
28.9 C (84.0 F)
1998
30.6 C (87.1 F)
1999
30.6 C (87.1 F)
2000
30.6 C (87.1 F)
2001
27.8 C (82.0 F)
2002
26.7 C (80.1 F)
2003
27.8 C (82.0 F)
2004
27.8 C (82.0 F)
2005
31.7 C (89.1 F)
2006
28.9 C (84.0 F)
2007
25.6 C (78.1 F)
2008
28.9 C (84.0 F)
2009
26.7 C (80.1 F)
2010
28.9 C (84.0 F)
2011
30.0 C (86.0 F)
2012
27.8 C (82.0 F)
Coldest night (TNn)
The coldest night of the year at Los Altares, 1973 to 2012. The record is -17.2 C (1.0 F) in 2009, marked on the chart; the median year is -12.2 C (10.0 F).
Coldest night (TNn) at Los Altares by year
Year
Coldest night (TNn)
1973
-11.1 C (12.0 F)
1974
-11.7 C (10.9 F)
1975
-13.9 C (7.0 F)
1976
-14.4 C (6.1 F)
1977
-11.1 C (12.0 F)
1978
-15.6 C (3.9 F)
1979
-13.9 C (7.0 F)
1980
-10.0 C (14.0 F)
1981
-10.0 C (14.0 F)
1982
-11.7 C (10.9 F)
1983
-11.1 C (12.0 F)
1984
-9.4 C (15.1 F)
1985
-13.3 C (8.1 F)
1986
-12.2 C (10.0 F)
1987
-12.2 C (10.0 F)
1988
-15.0 C (5.0 F)
1989
-13.3 C (8.1 F)
1990
-15.0 C (5.0 F)
1991
-11.1 C (12.0 F)
1992
-10.0 C (14.0 F)
1993
-10.0 C (14.0 F)
1994
-11.1 C (12.0 F)
1995
-10.6 C (12.9 F)
1996
-13.3 C (8.1 F)
1997
-15.0 C (5.0 F)
1998
-13.3 C (8.1 F)
1999
-16.1 C (3.0 F)
2000
-15.0 C (5.0 F)
2001
-5.0 C (23.0 F)
2002
-11.7 C (10.9 F)
2003
-12.2 C (10.0 F)
2004
-10.0 C (14.0 F)
2005
-12.2 C (10.0 F)
2006
-14.4 C (6.1 F)
2007
-12.2 C (10.0 F)
2008
-15.0 C (5.0 F)
2009
-17.2 C (1.0 F)
2010
-15.0 C (5.0 F)
2011
-15.0 C (5.0 F)
2012
-14.4 C (6.1 F)
Wettest day (Rx1day)
The wettest day of the year at Los Altares, 1973 to 2012. The record is 86.4 mm (3.4 in) in 1982, marked on the chart; the median year is 49.3 mm (1.9 in).
Wettest day (Rx1day) at Los Altares by year
Year
Wettest day (Rx1day)
1973
46.7 mm (1.8 in)
1974
65.8 mm (2.6 in)
1975
50.8 mm (2.0 in)
1976
67.3 mm (2.6 in)
1977
36.8 mm (1.4 in)
1978
49.8 mm (2.0 in)
1979
80.3 mm (3.2 in)
1980
62.0 mm (2.4 in)
1981
41.9 mm (1.6 in)
1982
86.4 mm (3.4 in)
1983
69.9 mm (2.8 in)
1984
46.0 mm (1.8 in)
1985
31.8 mm (1.3 in)
1986
81.8 mm (3.2 in)
1987
54.4 mm (2.1 in)
1988
39.9 mm (1.6 in)
1989
57.9 mm (2.3 in)
1990
54.4 mm (2.1 in)
1991
41.4 mm (1.6 in)
1992
47.8 mm (1.9 in)
1993
48.8 mm (1.9 in)
1994
34.8 mm (1.4 in)
1995
53.8 mm (2.1 in)
1996
42.9 mm (1.7 in)
1997
60.5 mm (2.4 in)
1998
27.9 mm (1.1 in)
1999
54.9 mm (2.2 in)
2000
36.8 mm (1.4 in)
2001
30.0 mm (1.2 in)
2002
45.0 mm (1.8 in)
2003
31.5 mm (1.2 in)
2004
55.9 mm (2.2 in)
2005
33.8 mm (1.3 in)
2006
39.9 mm (1.6 in)
2007
67.8 mm (2.7 in)
2008
49.8 mm (2.0 in)
2009
42.9 mm (1.7 in)
2010
74.9 mm (2.9 in)
2011
56.9 mm (2.2 in)
2012
27.4 mm (1.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Los Altares, 1973 to 2012. The record is 201.8 mm (7.9 in) in 1979, marked on the chart; the median year is 96.4 mm (3.8 in).
Wettest five days (Rx5day) at Los Altares by year
Year
Wettest five days (Rx5day)
1973
103.3 mm (4.1 in)
1974
102.4 mm (4.0 in)
1975
114.9 mm (4.5 in)
1976
109.3 mm (4.3 in)
1977
71.1 mm (2.8 in)
1978
67.6 mm (2.7 in)
1979
201.8 mm (7.9 in)
1980
96.6 mm (3.8 in)
1981
86.9 mm (3.4 in)
1982
108.5 mm (4.3 in)
1983
148.9 mm (5.9 in)
1984
60.0 mm (2.4 in)
1985
117.3 mm (4.6 in)
1986
88.2 mm (3.5 in)
1987
108.9 mm (4.3 in)
1988
70.9 mm (2.8 in)
1989
126.2 mm (5.0 in)
1990
96.3 mm (3.8 in)
1991
92.2 mm (3.6 in)
1992
73.0 mm (2.9 in)
1993
138.7 mm (5.5 in)
1994
58.5 mm (2.3 in)
1995
111.5 mm (4.4 in)
1996
79.6 mm (3.1 in)
1997
119.7 mm (4.7 in)
1998
62.7 mm (2.5 in)
1999
118.3 mm (4.7 in)
2000
79.6 mm (3.1 in)
2001
39.0 mm (1.5 in)
2002
80.2 mm (3.2 in)
2003
88.5 mm (3.5 in)
2004
90.7 mm (3.6 in)
2005
65.6 mm (2.6 in)
2006
113.5 mm (4.5 in)
2007
105.7 mm (4.2 in)
2008
111.3 mm (4.4 in)
2009
73.1 mm (2.9 in)
2010
119.0 mm (4.7 in)
2011
162.0 mm (6.4 in)
2012
73.1 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Los Altares, 1973 to 2012. The record is 162 days in 2011, marked on the chart; the median year is 56 days.
Longest dry spell (CDD) at Los Altares by year
Year
Longest dry spell (CDD)
1973
49 days
1974
68 days
1975
63 days
1976
63 days
1977
55 days
1978
32 days
1979
75 days
1980
37 days
1981
43 days
1982
117 days
1983
46 days
1984
13 days
1985
41 days
1986
50 days
1987
33 days
1988
51 days
1989
52 days
1990
79 days
1991
100 days
1992
37 days
1993
57 days
1994
43 days
1995
73 days
1996
70 days
1997
20 days
1998
74 days
1999
79 days
2000
92 days
2001
30 days
2002
33 days
2003
39 days
2004
30 days
2005
89 days
2006
58 days
2007
127 days
2008
76 days
2009
110 days
2010
78 days
2011
162 days
2012
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
24 years with a frost
Across 24 years with a frost, the median last spring frost at Los Altares falls on 31 May and the median first autumn frost on 3 October, which leaves a median of 124 days between them.
Frost dates and growing season at Los Altares
Measure
Median, all years
Earliest period
Recent period (1975 to 2011)
Recent against earliest
Fitted trend
Last spring frost
31 May
n/a
31 May
n/a
n/a
First autumn frost
3 October
n/a
3 October
n/a
n/a
Growing days
124 days
n/a
124 days
n/a
n/a
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
32 years, 1974 to 2012
A day with at least 50.3 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 95.3 mm (3.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Los Altares: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
50.3 mm (2.0 in)
5 years
64.5 mm (2.5 in)
10 years
73.0 mm (2.9 in)
25 years
82.7 mm (3.3 in)
50 years
89.3 mm (3.5 in)
Longer than the 32 years of record
100 years
95.3 mm (3.8 in)
Longer than the 32 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, 32 years of values from 1974 to 2012.
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: 86.4 mm (3.4 in) in 1982; 81.8 mm (3.2 in) in 1986; 80.3 mm (3.2 in) in 1979.
Download the Data
Data for Los Altares standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Los Altares 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.