Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Naco. 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 Naco, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
15.6 C (60.1 F)
-47.2 C (-53.0 F)
n/a
n/a
Feb
14.4 C (57.9 F)
-50.0 C (-58.0 F)
n/a
n/a
Mar
20.6 C (69.1 F)
-38.3 C (-36.9 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-33.9 C (-29.0 F)
n/a
n/a
May
35.6 C (96.1 F)
-15.0 C (5.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
-6.7 C (19.9 F)
n/a
n/a
Jul
40.6 C (105.1 F)
0.6 C (33.1 F)
n/a
n/a
Aug
39.4 C (102.9 F)
-4.4 C (24.1 F)
n/a
n/a
Sep
35.0 C (95.0 F)
-11.7 C (10.9 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Nov
22.2 C (72.0 F)
-35.0 C (-31.0 F)
n/a
n/a
Dec
15.0 C (59.0 F)
-43.3 C (-45.9 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Naco still stand. 1934 holds the most, with 86.
Standing records at Naco by the year they were set
Year set
Standing records
1930
24
1931
71
1932
54
1933
61
1934
86
1935
42
1936
82
1937
43
1938
28
1939
55
1940
40
1941
30
1942
54
1943
55
1944
23
1945
27
1946
25
1947
35
1948
33
1949
45
1950
63
1951
56
1952
23
1953
31
1954
56
1955
27
1956
38
1957
27
1958
41
1959
33
1960
32
1961
47
1962
29
1963
19
1964
11
1965
18
All-Time Record Progression
2 new records
2 all-time records were set at Naco between 1 July 1960 and 14 July 1962. Each dot is a new record.
When Naco set new all-time records
Date
Kind
Detail
1960-07-01
Record daily precipitation
Record daily precipitation 61.2 mm (2.4 in)
1962-07-14
Record daily precipitation
Record daily precipitation 74.9 mm (2.9 in)
Wettest Day of Each Month
Jul: 74.9 mm (2.9 in)
The wettest day on record for each calendar month at Naco. The most was 74.9 mm (2.9 in) on 14 July 1962.
Record daily precipitation for each month at Naco
Month
Record daily precipitation (mm)
Date
Jan
20.3 mm (0.8 in)
7 January 1954
Feb
15.2 mm (0.6 in)
25 February 1951
Mar
20.3 mm (0.8 in)
29 March 1946
Apr
30.5 mm (1.2 in)
30 April 1951
May
35.6 mm (1.4 in)
20 May 1939
Jun
63.5 mm (2.5 in)
21 June 1963
Jul
74.9 mm (2.9 in)
14 July 1962
Aug
48.0 mm (1.9 in)
4 August 1965
Sep
32.5 mm (1.3 in)
21 September 1945
Oct
34.3 mm (1.4 in)
2 October 1946
Nov
12.7 mm (0.5 in)
23 November 1946
Dec
12.7 mm (0.5 in)
15 December 1946
Period of Record Coverage
1930 to 1965
Complete yearUnder 90 percent of days
36 years of record at Naco, 1930 to 1965. 4 years have data for under 90 percent of days and are left out of rankings: 1930, 1963, 1964, 1965.
Cooler than the station meanWarmer than the station mean
One stripe for each of 23 complete years at Naco, 1931 to 1962. Blue stripes are years cooler than the station's own mean of 1.8 C (35.3 F); red stripes are warmer. The coolest year was 1950, at -0.5 C (31.1 F), and the warmest was 1931, at 4.4 C (40.0 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Naco as warming stripes, 1931 to 1962
Year
Annual mean temperature
Difference from the station mean
1931
4.4 C
+2.59 C
1932
1.6 C
-0.19 C
1933
1.7 C
-0.09 C
1934
3.5 C
+1.62 C
1935
0.4 C
-1.42 C
1937
1.5 C
-0.37 C
1938
2.8 C
+0.96 C
1939
2.8 C
+0.99 C
1940
1.5 C
-0.32 C
1941
2.7 C
+0.83 C
1942
2.3 C
+0.47 C
1945
0.8 C
-1.07 C
1949
1.9 C
+0.06 C
1950
-0.5 C
-2.34 C
1951
-0.5 C
-2.34 C
1953
3.1 C
+1.28 C
1954
1.1 C
-0.71 C
1956
0.7 C
-1.13 C
1957
1.8 C
-0.07 C
1958
2.5 C
+0.65 C
1960
2.0 C
+0.18 C
1961
2.2 C
+0.35 C
1962
1.9 C
+0.07 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
1930 to 1965
Yearly extremes at Naco: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
40.6 C (105.1 F)
1941
35.6 C (96.1 F)
36
Coldest night (TNn)
-50.0 C (-58.0 F)
1936
-38.3 C (-36.9 F)
36
Wettest day (Rx1day)
74.9 mm (2.9 in)
1962
28.9 mm (1.1 in)
36
Wettest five days (Rx5day)
136.6 mm (5.4 in)
1962
42.1 mm (1.7 in)
36
Longest dry spell (CDD)
76 days
1930
33 days
36
Hottest day (TXx)
The hottest day of the year at Naco, 1930 to 1965. The record is 40.6 C (105.1 F) in 1941, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Naco by year
Year
Hottest day (TXx)
1930
36.1 C (97.0 F)
1931
37.2 C (99.0 F)
1932
36.1 C (97.0 F)
1933
38.9 C (102.0 F)
1934
36.1 C (97.0 F)
1935
36.7 C (98.1 F)
1936
35.6 C (96.1 F)
1937
38.9 C (102.0 F)
1938
34.4 C (93.9 F)
1939
38.9 C (102.0 F)
1940
36.7 C (98.1 F)
1941
40.6 C (105.1 F)
1942
33.9 C (93.0 F)
1943
35.0 C (95.0 F)
1944
35.6 C (96.1 F)
1945
37.2 C (99.0 F)
1946
35.6 C (96.1 F)
1947
37.8 C (100.0 F)
1948
35.0 C (95.0 F)
1949
35.6 C (96.1 F)
1950
32.8 C (91.0 F)
1951
35.6 C (96.1 F)
1952
32.8 C (91.0 F)
1953
35.0 C (95.0 F)
1954
34.4 C (93.9 F)
1955
35.6 C (96.1 F)
1956
32.8 C (91.0 F)
1957
33.3 C (91.9 F)
1958
33.3 C (91.9 F)
1959
32.8 C (91.0 F)
1960
35.0 C (95.0 F)
1961
39.4 C (102.9 F)
1962
33.9 C (93.0 F)
1963
33.9 C (93.0 F)
1964
28.9 C (84.0 F)
1965
33.3 C (91.9 F)
Coldest night (TNn)
The coldest night of the year at Naco, 1930 to 1965. The record is -50.0 C (-58.0 F) in 1936, marked on the chart; the median year is -38.3 C (-36.9 F).
Coldest night (TNn) at Naco by year
Year
Coldest night (TNn)
1930
-21.1 C (-6.0 F)
1931
-30.0 C (-22.0 F)
1932
-41.1 C (-42.0 F)
1933
-36.1 C (-33.0 F)
1934
-38.9 C (-38.0 F)
1935
-42.8 C (-45.0 F)
1936
-50.0 C (-58.0 F)
1937
-40.6 C (-41.1 F)
1938
-43.3 C (-45.9 F)
1939
-43.3 C (-45.9 F)
1940
-37.8 C (-36.0 F)
1941
-36.7 C (-34.1 F)
1942
-42.2 C (-44.0 F)
1943
-47.2 C (-53.0 F)
1944
-38.3 C (-36.9 F)
1945
-37.2 C (-35.0 F)
1946
-37.8 C (-36.0 F)
1947
-43.3 C (-45.9 F)
1948
-35.6 C (-32.1 F)
1949
-38.9 C (-38.0 F)
1950
-43.9 C (-47.0 F)
1951
-38.3 C (-36.9 F)
1952
-37.8 C (-36.0 F)
1953
-35.0 C (-31.0 F)
1954
-43.3 C (-45.9 F)
1955
-37.2 C (-35.0 F)
1956
-41.1 C (-42.0 F)
1957
-37.8 C (-36.0 F)
1958
-37.8 C (-36.0 F)
1959
-35.0 C (-31.0 F)
1960
-37.8 C (-36.0 F)
1961
-38.3 C (-36.9 F)
1962
-43.9 C (-47.0 F)
1963
-40.0 C (-40.0 F)
1964
-31.1 C (-24.0 F)
1965
-11.7 C (10.9 F)
Wettest day (Rx1day)
The wettest day of the year at Naco, 1930 to 1965. The record is 74.9 mm (2.9 in) in 1962, marked on the chart; the median year is 28.9 mm (1.1 in).
Wettest day (Rx1day) at Naco by year
Year
Wettest day (Rx1day)
1930
30.5 mm (1.2 in)
1931
12.2 mm (0.5 in)
1932
27.2 mm (1.1 in)
1933
16.5 mm (0.6 in)
1934
16.0 mm (0.6 in)
1935
35.3 mm (1.4 in)
1936
13.5 mm (0.5 in)
1937
27.4 mm (1.1 in)
1938
28.2 mm (1.1 in)
1939
35.6 mm (1.4 in)
1940
24.1 mm (0.9 in)
1941
42.7 mm (1.7 in)
1942
24.4 mm (1.0 in)
1943
30.0 mm (1.2 in)
1944
41.9 mm (1.6 in)
1945
32.5 mm (1.3 in)
1946
34.3 mm (1.4 in)
1947
17.8 mm (0.7 in)
1948
26.9 mm (1.1 in)
1949
24.6 mm (1.0 in)
1950
56.6 mm (2.2 in)
1951
30.5 mm (1.2 in)
1952
12.2 mm (0.5 in)
1953
29.5 mm (1.2 in)
1954
32.0 mm (1.3 in)
1955
31.0 mm (1.2 in)
1956
33.0 mm (1.3 in)
1957
24.9 mm (1.0 in)
1958
17.5 mm (0.7 in)
1959
20.8 mm (0.8 in)
1960
61.2 mm (2.4 in)
1961
21.8 mm (0.9 in)
1962
74.9 mm (2.9 in)
1963
63.5 mm (2.5 in)
1964
23.1 mm (0.9 in)
1965
52.8 mm (2.1 in)
Wettest five days (Rx5day)
The wettest five days of the year at Naco, 1930 to 1965. The record is 136.6 mm (5.4 in) in 1962, marked on the chart; the median year is 42.1 mm (1.7 in).
Wettest five days (Rx5day) at Naco by year
Year
Wettest five days (Rx5day)
1930
34.8 mm (1.4 in)
1931
18.7 mm (0.7 in)
1932
38.6 mm (1.5 in)
1933
22.9 mm (0.9 in)
1934
29.2 mm (1.1 in)
1935
37.8 mm (1.5 in)
1936
14.5 mm (0.6 in)
1937
42.1 mm (1.7 in)
1938
59.9 mm (2.4 in)
1939
60.3 mm (2.4 in)
1940
58.4 mm (2.3 in)
1941
50.3 mm (2.0 in)
1942
44.8 mm (1.8 in)
1943
42.0 mm (1.7 in)
1944
71.1 mm (2.8 in)
1945
53.3 mm (2.1 in)
1946
38.9 mm (1.5 in)
1947
32.9 mm (1.3 in)
1948
35.2 mm (1.4 in)
1949
43.5 mm (1.7 in)
1950
76.9 mm (3.0 in)
1951
52.6 mm (2.1 in)
1952
24.7 mm (1.0 in)
1953
37.5 mm (1.5 in)
1954
51.7 mm (2.0 in)
1955
38.4 mm (1.5 in)
1956
56.1 mm (2.2 in)
1957
34.3 mm (1.4 in)
1958
29.5 mm (1.2 in)
1959
30.3 mm (1.2 in)
1960
74.1 mm (2.9 in)
1961
23.6 mm (0.9 in)
1962
136.6 mm (5.4 in)
1963
86.9 mm (3.4 in)
1964
51.1 mm (2.0 in)
1965
82.0 mm (3.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Naco, 1930 to 1965. The record is 76 days in 1930, marked on the chart; the median year is 33 days.
Longest dry spell (CDD) at Naco by year
Year
Longest dry spell (CDD)
1930
76 days
1931
68 days
1932
41 days
1933
33 days
1934
44 days
1935
37 days
1936
37 days
1937
46 days
1938
28 days
1939
29 days
1940
32 days
1941
27 days
1942
33 days
1943
21 days
1944
41 days
1945
31 days
1946
32 days
1947
25 days
1948
36 days
1949
31 days
1950
36 days
1951
28 days
1952
36 days
1953
35 days
1954
46 days
1955
32 days
1956
28 days
1957
39 days
1958
41 days
1959
28 days
1960
30 days
1961
29 days
1962
28 days
1963
14 days
1964
14 days
1965
35 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
23 years with a frost
Across 23 years with a frost, the median last spring frost at Naco falls on 7 June and the median first autumn frost on 3 September, which leaves a median of 90 days between them.
Frost dates and growing season at Naco
Measure
Median, all years
Earliest period
Recent period (1931 to 1962)
Recent against earliest
Fitted trend
Last spring frost
7 June
n/a
7 June
n/a
n/a
First autumn frost
3 September
n/a
3 September
n/a
n/a
Growing days
90 days
n/a
90 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, 1931 to 1962
A day with at least 26.9 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 78.9 mm (3.1 in) of rain is expected about once in 100 years.
Rainfall return levels at Naco: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
26.9 mm (1.1 in)
5 years
38.7 mm (1.5 in)
10 years
47.3 mm (1.9 in)
25 years
59.1 mm (2.3 in)
50 years
68.7 mm (2.7 in)
Longer than the 32 years of record
100 years
78.9 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 1931 to 1962.
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: 74.9 mm (2.9 in) in 1962; 61.2 mm (2.4 in) in 1960; 56.6 mm (2.2 in) in 1950.
Download the Data
Data for Naco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Naco 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.