Record envelope, standing records and threshold days for San Carlos (USC00027475), Arizona, United States, with 66 years of record.
Key Facts for San Carlos
San Carlos (USC00027475) is a weather station in Arizona, United States at 33.35 latitude and -110.45 longitude, 805 m (2,641 ft) above sea level.
The station reports from 1912 to 1977, 66 years of record.
1,464 records set at San Carlos still stand.
Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
San Carlos set a daily record high minimum temperature of 12.2 C (54.0 F) on 28 April 1977.
About the Station
Location: Arizona, United States, 33.35 latitude, -110.45 longitude.
Elevation: 805 m (2,641 ft).
Period of record: 1912 to 1977, 66 years.
Eligible elements: tmax, tmin, prcp, snow.
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 San Carlos. 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 Carlos, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
31.7 C (89.1 F)
-13.3 C (8.1 F)
n/a
n/a
Feb
30.0 C (86.0 F)
-12.2 C (10.0 F)
n/a
n/a
Mar
32.8 C (91.0 F)
-8.9 C (16.0 F)
n/a
n/a
Apr
38.3 C (100.9 F)
-6.7 C (19.9 F)
n/a
n/a
May
43.3 C (109.9 F)
-3.9 C (25.0 F)
n/a
n/a
Jun
46.1 C (115.0 F)
3.3 C (37.9 F)
n/a
n/a
Jul
45.0 C (113.0 F)
7.8 C (46.0 F)
n/a
n/a
Aug
43.3 C (109.9 F)
8.9 C (48.0 F)
n/a
n/a
Sep
44.4 C (111.9 F)
2.2 C (36.0 F)
n/a
n/a
Oct
37.8 C (100.0 F)
-5.6 C (21.9 F)
n/a
n/a
Nov
32.8 C (91.0 F)
-10.6 C (12.9 F)
n/a
n/a
Dec
29.4 C (84.9 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 San Carlos still stand. 1941 holds the most, with 81.
Standing records at San Carlos by the year they were set
Year set
Standing records
1913
40
1914
29
1915
23
1916
28
1941
81
1942
20
1943
37
1944
30
1945
41
1946
47
1947
46
1948
40
1949
47
1950
57
1951
28
1952
22
1953
52
1954
25
1955
43
1956
60
1957
30
1958
39
1959
25
1960
33
1961
27
1962
31
1963
20
1964
40
1965
43
1966
31
1967
33
1968
29
1969
25
1970
27
1971
51
1972
62
1973
31
1974
20
1975
30
1976
27
1977
14
All-Time Record Progression
1 new records
1 all-time records were set at San Carlos between 25 June 1970 and 25 June 1970. Each dot is a new record.
When San Carlos set new all-time records
Date
Kind
Detail
1970-06-25
Record high maximum temperature
Record high maximum temperature 46.1 C (115.0 F)
Wettest Day of Each Month
Aug: 86.4 mm (3.4 in)
The wettest day on record for each calendar month at San Carlos. The most was 86.4 mm (3.4 in) on 27 August 1951.
Record daily precipitation for each month at San Carlos
Month
Record daily precipitation (mm)
Date
Jan
47.5 mm (1.9 in)
13 January 1952
Feb
46.2 mm (1.8 in)
2 February 1940
Mar
36.6 mm (1.4 in)
23 March 1954
Apr
18.5 mm (0.7 in)
20 April 1952
May
28.2 mm (1.1 in)
5 May 1969
Jun
30.0 mm (1.2 in)
2 June 1952
Jul
43.2 mm (1.7 in)
23 July 1960
Aug
86.4 mm (3.4 in)
27 August 1951
Sep
58.7 mm (2.3 in)
28 September 1941
Oct
54.6 mm (2.1 in)
30 October 1959
Nov
37.8 mm (1.5 in)
13 November 1941
Dec
42.7 mm (1.7 in)
10 December 1965
Period of Record Coverage
1912 to 1977
Complete yearUnder 90 percent of days
42 years of record at San Carlos, 1912 to 1977. 13 years have data for under 90 percent of days and are left out of rankings: 1912, 1913, 1914, 1915, 1916, 1970, 1971, 1972 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 26 complete years at San Carlos, 1941 to 1969. Blue stripes are years cooler than the station's own mean of 17.4 C (63.3 F); red stripes are warmer. The coolest year was 1964, at 16.5 C (61.8 F), and the warmest was 1941, at 18.4 C (65.1 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at San Carlos as warming stripes, 1941 to 1969
Year
Annual mean temperature
Difference from the station mean
1941
18.4 C
+1.02 C
1942
16.9 C
-0.45 C
1943
17.5 C
+0.14 C
1944
17.1 C
-0.25 C
1945
17.2 C
-0.14 C
1946
17.7 C
+0.34 C
1947
17.7 C
+0.31 C
1948
17.6 C
+0.23 C
1949
17.2 C
-0.16 C
1951
17.6 C
+0.20 C
1952
17.7 C
+0.29 C
1954
18.0 C
+0.65 C
1955
16.9 C
-0.49 C
1956
17.2 C
-0.19 C
1957
17.5 C
+0.13 C
1958
17.3 C
-0.11 C
1959
17.7 C
+0.31 C
1960
17.5 C
+0.17 C
1961
17.7 C
+0.34 C
1963
17.3 C
-0.06 C
1964
16.5 C
-0.84 C
1965
17.1 C
-0.23 C
1966
17.0 C
-0.35 C
1967
16.7 C
-0.70 C
1968
16.9 C
-0.48 C
1969
17.7 C
+0.36 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
1912 to 1977
Yearly extremes at San Carlos: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
46.1 C (115.0 F)
1970
43.3 C (109.9 F)
42
Coldest night (TNn)
-16.1 C (3.0 F)
1953
-10.0 C (14.0 F)
42
Wettest day (Rx1day)
86.4 mm (3.4 in)
1951
36.1 mm (1.4 in)
43
Wettest five days (Rx5day)
107.4 mm (4.2 in)
1959
50.8 mm (2.0 in)
43
Longest dry spell (CDD)
156 days
1972
69 days
43
Hottest day (TXx)
The hottest day of the year at San Carlos, 1912 to 1977. The record is 46.1 C (115.0 F) in 1970, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at San Carlos by year
Year
Hottest day (TXx)
1912
31.1 C (88.0 F)
1913
42.8 C (109.0 F)
1914
40.6 C (105.1 F)
1915
41.1 C (106.0 F)
1916
41.1 C (106.0 F)
1940
n/a
1941
42.8 C (109.0 F)
1942
42.2 C (108.0 F)
1943
42.2 C (108.0 F)
1944
43.3 C (109.9 F)
1945
42.2 C (108.0 F)
1946
43.9 C (111.0 F)
1947
42.8 C (109.0 F)
1948
44.4 C (111.9 F)
1949
43.3 C (109.9 F)
1950
43.3 C (109.9 F)
1951
43.3 C (109.9 F)
1952
43.3 C (109.9 F)
1953
43.3 C (109.9 F)
1954
43.3 C (109.9 F)
1955
43.3 C (109.9 F)
1956
43.3 C (109.9 F)
1957
43.3 C (109.9 F)
1958
45.0 C (113.0 F)
1959
42.2 C (108.0 F)
1960
45.6 C (114.1 F)
1961
42.8 C (109.0 F)
1962
42.2 C (108.0 F)
1963
42.8 C (109.0 F)
1964
42.8 C (109.0 F)
1965
42.8 C (109.0 F)
1966
43.3 C (109.9 F)
1967
43.3 C (109.9 F)
1968
43.9 C (111.0 F)
1969
44.4 C (111.9 F)
1970
46.1 C (115.0 F)
1971
40.6 C (105.1 F)
1972
44.4 C (111.9 F)
1973
42.8 C (109.0 F)
1974
43.3 C (109.9 F)
1975
41.1 C (106.0 F)
1976
43.3 C (109.9 F)
1977
31.7 C (89.1 F)
Coldest night (TNn)
The coldest night of the year at San Carlos, 1912 to 1977. The record is -16.1 C (3.0 F) in 1953, marked on the chart; the median year is -10.0 C (14.0 F).
Coldest night (TNn) at San Carlos by year
Year
Coldest night (TNn)
1912
-8.3 C (17.1 F)
1913
-12.8 C (9.0 F)
1914
-6.7 C (19.9 F)
1915
-8.9 C (16.0 F)
1916
-8.3 C (17.1 F)
1940
n/a
1941
-6.7 C (19.9 F)
1942
-8.3 C (17.1 F)
1943
-8.3 C (17.1 F)
1944
-11.7 C (10.9 F)
1945
-10.0 C (14.0 F)
1946
-11.1 C (12.0 F)
1947
-10.6 C (12.9 F)
1948
-12.8 C (9.0 F)
1949
-10.6 C (12.9 F)
1950
-11.1 C (12.0 F)
1951
-9.4 C (15.1 F)
1952
-7.8 C (18.0 F)
1953
-16.1 C (3.0 F)
1954
-13.3 C (8.1 F)
1955
-10.6 C (12.9 F)
1956
-12.2 C (10.0 F)
1957
-8.3 C (17.1 F)
1958
-12.8 C (9.0 F)
1959
-11.7 C (10.9 F)
1960
-8.9 C (16.0 F)
1961
-6.7 C (19.9 F)
1962
-10.0 C (14.0 F)
1963
-10.6 C (12.9 F)
1964
-12.8 C (9.0 F)
1965
-8.3 C (17.1 F)
1966
-10.6 C (12.9 F)
1967
-12.2 C (10.0 F)
1968
-10.6 C (12.9 F)
1969
-7.2 C (19.0 F)
1970
-10.0 C (14.0 F)
1971
-12.8 C (9.0 F)
1972
-7.8 C (18.0 F)
1973
-8.9 C (16.0 F)
1974
-10.0 C (14.0 F)
1975
-7.8 C (18.0 F)
1976
-10.0 C (14.0 F)
1977
-7.8 C (18.0 F)
Wettest day (Rx1day)
The wettest day of the year at San Carlos, 1912 to 1977. The record is 86.4 mm (3.4 in) in 1951, marked on the chart; the median year is 36.1 mm (1.4 in).
Wettest day (Rx1day) at San Carlos by year
Year
Wettest day (Rx1day)
1912
16.0 mm (0.6 in)
1913
16.0 mm (0.6 in)
1914
38.1 mm (1.5 in)
1915
30.5 mm (1.2 in)
1916
38.1 mm (1.5 in)
1940
46.2 mm (1.8 in)
1941
58.7 mm (2.3 in)
1942
36.8 mm (1.4 in)
1943
52.3 mm (2.1 in)
1944
25.4 mm (1.0 in)
1945
33.3 mm (1.3 in)
1946
24.1 mm (0.9 in)
1947
37.3 mm (1.5 in)
1948
34.3 mm (1.4 in)
1949
21.6 mm (0.9 in)
1950
26.4 mm (1.0 in)
1951
86.4 mm (3.4 in)
1952
47.5 mm (1.9 in)
1953
37.8 mm (1.5 in)
1954
36.6 mm (1.4 in)
1955
46.2 mm (1.8 in)
1956
41.4 mm (1.6 in)
1957
32.0 mm (1.3 in)
1958
46.2 mm (1.8 in)
1959
54.6 mm (2.1 in)
1960
43.2 mm (1.7 in)
1961
27.9 mm (1.1 in)
1962
27.7 mm (1.1 in)
1963
33.8 mm (1.3 in)
1964
17.0 mm (0.7 in)
1965
42.7 mm (1.7 in)
1966
24.1 mm (0.9 in)
1967
36.1 mm (1.4 in)
1968
40.1 mm (1.6 in)
1969
28.2 mm (1.1 in)
1970
30.7 mm (1.2 in)
1971
32.0 mm (1.3 in)
1972
42.4 mm (1.7 in)
1973
29.5 mm (1.2 in)
1974
43.2 mm (1.7 in)
1975
17.8 mm (0.7 in)
1976
37.3 mm (1.5 in)
1977
6.4 mm (0.25 in)
Wettest five days (Rx5day)
The wettest five days of the year at San Carlos, 1912 to 1977. The record is 107.4 mm (4.2 in) in 1959, marked on the chart; the median year is 50.8 mm (2.0 in).
Wettest five days (Rx5day) at San Carlos by year
Year
Wettest five days (Rx5day)
1912
31.0 mm (1.2 in)
1913
39.0 mm (1.5 in)
1914
75.2 mm (3.0 in)
1915
58.7 mm (2.3 in)
1916
91.0 mm (3.6 in)
1940
50.8 mm (2.0 in)
1941
90.8 mm (3.6 in)
1942
38.8 mm (1.5 in)
1943
56.6 mm (2.2 in)
1944
32.1 mm (1.3 in)
1945
68.9 mm (2.7 in)
1946
62.2 mm (2.4 in)
1947
43.2 mm (1.7 in)
1948
65.3 mm (2.6 in)
1949
33.0 mm (1.3 in)
1950
34.3 mm (1.4 in)
1951
90.0 mm (3.5 in)
1952
48.3 mm (1.9 in)
1953
39.3 mm (1.5 in)
1954
72.3 mm (2.8 in)
1955
93.7 mm (3.7 in)
1956
63.0 mm (2.5 in)
1957
41.0 mm (1.6 in)
1958
53.6 mm (2.1 in)
1959
107.4 mm (4.2 in)
1960
49.3 mm (1.9 in)
1961
37.7 mm (1.5 in)
1962
40.7 mm (1.6 in)
1963
50.1 mm (2.0 in)
1964
27.4 mm (1.1 in)
1965
73.4 mm (2.9 in)
1966
40.6 mm (1.6 in)
1967
90.2 mm (3.6 in)
1968
55.1 mm (2.2 in)
1969
38.3 mm (1.5 in)
1970
62.5 mm (2.5 in)
1971
59.2 mm (2.3 in)
1972
73.4 mm (2.9 in)
1973
37.9 mm (1.5 in)
1974
43.2 mm (1.7 in)
1975
19.3 mm (0.8 in)
1976
59.6 mm (2.3 in)
1977
24.1 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at San Carlos, 1912 to 1977. The record is 156 days in 1972, marked on the chart; the median year is 69 days.
Longest dry spell (CDD) at San Carlos by year
Year
Longest dry spell (CDD)
1912
35 days
1913
49 days
1914
37 days
1915
43 days
1916
87 days
1940
33 days
1941
31 days
1942
69 days
1943
79 days
1944
52 days
1945
101 days
1946
106 days
1947
69 days
1948
120 days
1949
45 days
1950
88 days
1951
71 days
1952
34 days
1953
82 days
1954
63 days
1955
105 days
1956
55 days
1957
45 days
1958
45 days
1959
98 days
1960
40 days
1961
111 days
1962
119 days
1963
45 days
1964
59 days
1965
74 days
1966
85 days
1967
49 days
1968
92 days
1969
64 days
1970
81 days
1971
100 days
1972
156 days
1973
94 days
1974
109 days
1975
81 days
1976
46 days
1977
54 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
26 years with a frost
Across 26 years with a frost, the median last spring frost at San Carlos falls on 20 April and the median first autumn frost on 2 November, which leaves a median of 193 days between them.
Fitted over all years, the growing season changes by +0.1 days per decade at this station.
Frost dates and growing season at San Carlos
Measure
Median, all years
Earliest period
Recent period (1941 to 1969)
Recent against earliest
Fitted trend
Last spring frost
20 April
n/a
20 April
n/a
+2.2 days per decade
First autumn frost
2 November
n/a
2 November
n/a
+2.3 days per decade
Growing days
193 days
n/a
193 days
n/a
+0.1 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
32 years, 1915 to 1972
A day with at least 35.9 mm (1.4 in) of rain is expected about once in 2 years. A day with at least 79.6 mm (3.1 in) of rain is expected about once in 100 years.
Rainfall return levels at San Carlos: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
35.9 mm (1.4 in)
5 years
47.4 mm (1.9 in)
10 years
55.1 mm (2.2 in)
25 years
64.9 mm (2.6 in)
50 years
72.2 mm (2.8 in)
Longer than the 32 years of record
100 years
79.6 mm (3.1 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 1915 to 1972.
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 1951; 58.7 mm (2.3 in) in 1941; 54.6 mm (2.1 in) in 1959.
Download the Data
Data for San Carlos standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Carlos 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.