Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Zacatecas (Smn). 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 Zacatecas (Smn), with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
30.6 C (87.1 F)
-7.2 C (19.0 F)
n/a
n/a
Feb
29.4 C (84.9 F)
-8.3 C (17.1 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-2.8 C (27.0 F)
n/a
n/a
Apr
31.1 C (88.0 F)
-1.1 C (30.0 F)
n/a
n/a
May
35.6 C (96.1 F)
3.3 C (37.9 F)
n/a
n/a
Jun
33.3 C (91.9 F)
3.9 C (39.0 F)
n/a
n/a
Jul
29.4 C (84.9 F)
5.6 C (42.1 F)
n/a
n/a
Aug
29.4 C (84.9 F)
5.6 C (42.1 F)
n/a
n/a
Sep
30.0 C (86.0 F)
3.3 C (37.9 F)
n/a
n/a
Oct
30.0 C (86.0 F)
0.6 C (33.1 F)
n/a
n/a
Nov
28.9 C (84.0 F)
-6.1 C (21.0 F)
n/a
n/a
Dec
27.8 C (82.0 F)
-4.4 C (24.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Zacatecas (Smn) still stand. 1960 holds the most, with 117.
Standing records at Zacatecas (Smn) by the year they were set
Year set
Standing records
1929
23
1930
50
1931
49
1932
57
1933
34
1934
15
1935
26
1936
17
1938
37
1939
21
1940
25
1941
22
1942
15
1943
22
1944
30
1945
30
1946
27
1947
26
1948
29
1949
27
1950
19
1951
36
1952
27
1953
25
1954
20
1955
32
1956
25
1957
54
1958
41
1959
52
1960
117
1971
27
1972
45
1973
36
1974
22
1975
29
1976
31
1977
27
1978
23
1979
24
1980
38
1981
11
1982
27
1983
35
1984
21
1985
38
Wettest Day of Each Month
Jul: 82.3 mm (3.2 in)
The wettest day on record for each calendar month at Zacatecas (Smn). The most was 82.3 mm (3.2 in) on 10 July 1955.
Record daily precipitation for each month at Zacatecas (Smn)
Month
Record daily precipitation (mm)
Date
Jan
48.0 mm (1.9 in)
5 January 1948
Feb
17.3 mm (0.7 in)
12 February 1935
Mar
32.8 mm (1.3 in)
6 March 1958
Apr
52.1 mm (2.1 in)
14 April 1959
May
43.4 mm (1.7 in)
27 May 1983
Jun
60.2 mm (2.4 in)
12 June 1985
Jul
82.3 mm (3.2 in)
10 July 1955
Aug
46.5 mm (1.8 in)
28 August 1932
Sep
74.9 mm (2.9 in)
28 September 1973
Oct
34.8 mm (1.4 in)
16 October 1973
Nov
45.0 mm (1.8 in)
8 November 1930
Dec
64.8 mm (2.6 in)
26 December 1978
Period of Record Coverage
1929 to 1985
Complete yearUnder 90 percent of days
46 years of record at Zacatecas (Smn), 1929 to 1985. 7 years have data for under 90 percent of days and are left out of rankings: 1929, 1956, 1960, 1978, 1980, 1981, 1982.
Cooler than the station meanWarmer than the station mean
One stripe for each of 35 complete years at Zacatecas (Smn), 1930 to 1985. Blue stripes are years cooler than the station's own mean of 15.5 C (59.9 F); red stripes are warmer. The coolest year was 1985, at 13.9 C (57.1 F), and the warmest was 1945, at 16.5 C (61.7 F). The strongest colour marks a difference of 1.6 C (2.9 F).
Annual mean temperature at Zacatecas (Smn) as warming stripes, 1930 to 1985
Year
Annual mean temperature
Difference from the station mean
1930
15.0 C
-0.49 C
1931
14.8 C
-0.67 C
1932
15.7 C
+0.19 C
1935
15.1 C
-0.43 C
1936
15.7 C
+0.26 C
1938
15.8 C
+0.32 C
1939
15.5 C
-0.01 C
1941
15.6 C
+0.13 C
1942
15.5 C
+0.02 C
1943
15.5 C
-0.02 C
1944
15.2 C
-0.29 C
1945
16.5 C
+1.04 C
1946
16.1 C
+0.64 C
1947
15.9 C
+0.39 C
1948
16.4 C
+0.87 C
1949
16.1 C
+0.64 C
1950
16.4 C
+0.88 C
1951
16.1 C
+0.57 C
1952
15.7 C
+0.20 C
1953
15.4 C
-0.10 C
1954
16.0 C
+0.54 C
1957
16.4 C
+0.94 C
1958
15.5 C
+0.01 C
1959
15.3 C
-0.22 C
1971
15.3 C
-0.16 C
1972
15.7 C
+0.22 C
1973
15.1 C
-0.38 C
1974
15.4 C
-0.10 C
1975
15.2 C
-0.24 C
1976
14.5 C
-0.99 C
1977
15.1 C
-0.42 C
1979
15.3 C
-0.16 C
1983
14.6 C
-0.86 C
1984
14.6 C
-0.85 C
1985
13.9 C
-1.56 C
The annual mean temperature here has fallen by 0.16 C (0.05 to 0.27) per decade over 1930 to 1985. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 35 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Zacatecas (Smn)
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.16 C (-0.27 to -0.05) per decade
-0.3 F (-0.5 to -0.1) per decade
1930 to 1985
35
Fall
Mean daily maximum
-0.4 C (-0.6 to -0.2) per decade
-0.8 F (-1.2 to -0.4) per decade
1930 to 1985
35
Fall
Mean daily minimum
0.12 C (0.02 to 0.22) per decade
0.21 F (0.04 to 0.39) per decade
1930 to 1985
35
Rise
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
1929 to 1985
Yearly extremes at Zacatecas (Smn): the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
35.6 C (96.1 F)
1949
30.0 C (86.0 F)
46
Coldest night (TNn)
-8.3 C (17.1 F)
1960
-2.2 C (28.0 F)
46
Wettest day (Rx1day)
82.3 mm (3.2 in)
1955
41.9 mm (1.6 in)
46
Wettest five days (Rx5day)
122.9 mm (4.8 in)
1930
74.9 mm (2.9 in)
46
Longest dry spell (CDD)
139 days
1960
78 days
46
Hottest day (TXx)
The hottest day of the year at Zacatecas (Smn), 1929 to 1985. The record is 35.6 C (96.1 F) in 1949, marked on the chart; the median year is 30.0 C (86.0 F).
Hottest day (TXx) at Zacatecas (Smn) by year
Year
Hottest day (TXx)
1929
28.9 C (84.0 F)
1930
31.1 C (88.0 F)
1931
30.0 C (86.0 F)
1932
32.2 C (90.0 F)
1933
31.7 C (89.1 F)
1934
29.4 C (84.9 F)
1935
28.9 C (84.0 F)
1936
30.0 C (86.0 F)
1938
31.7 C (89.1 F)
1939
29.4 C (84.9 F)
1940
28.9 C (84.0 F)
1941
28.3 C (82.9 F)
1942
28.9 C (84.0 F)
1943
29.4 C (84.9 F)
1944
28.9 C (84.0 F)
1945
29.4 C (84.9 F)
1946
29.4 C (84.9 F)
1947
29.4 C (84.9 F)
1948
29.4 C (84.9 F)
1949
35.6 C (96.1 F)
1950
28.3 C (82.9 F)
1951
28.3 C (82.9 F)
1952
27.8 C (82.0 F)
1953
31.7 C (89.1 F)
1954
31.1 C (88.0 F)
1955
30.6 C (87.1 F)
1956
31.1 C (88.0 F)
1957
32.2 C (90.0 F)
1958
29.4 C (84.9 F)
1959
29.4 C (84.9 F)
1960
30.0 C (86.0 F)
1971
30.6 C (87.1 F)
1972
30.6 C (87.1 F)
1973
31.1 C (88.0 F)
1974
30.0 C (86.0 F)
1975
30.0 C (86.0 F)
1976
30.6 C (87.1 F)
1977
29.4 C (84.9 F)
1978
30.6 C (87.1 F)
1979
29.4 C (84.9 F)
1980
30.6 C (87.1 F)
1981
29.4 C (84.9 F)
1982
33.3 C (91.9 F)
1983
31.7 C (89.1 F)
1984
31.1 C (88.0 F)
1985
30.6 C (87.1 F)
Coldest night (TNn)
The coldest night of the year at Zacatecas (Smn), 1929 to 1985. The record is -8.3 C (17.1 F) in 1960, marked on the chart; the median year is -2.2 C (28.0 F).
Coldest night (TNn) at Zacatecas (Smn) by year
Year
Coldest night (TNn)
1929
-6.1 C (21.0 F)
1930
-2.8 C (27.0 F)
1931
-1.7 C (28.9 F)
1932
-2.2 C (28.0 F)
1933
0.6 C (33.1 F)
1934
-0.6 C (30.9 F)
1935
-4.4 C (24.1 F)
1936
0.0 C (32.0 F)
1938
-2.8 C (27.0 F)
1939
-0.6 C (30.9 F)
1940
-3.3 C (26.1 F)
1941
-3.3 C (26.1 F)
1942
-3.9 C (25.0 F)
1943
-0.6 C (30.9 F)
1944
-6.7 C (19.9 F)
1945
-2.8 C (27.0 F)
1946
-2.8 C (27.0 F)
1947
-3.3 C (26.1 F)
1948
-1.1 C (30.0 F)
1949
-0.6 C (30.9 F)
1950
-0.6 C (30.9 F)
1951
-3.3 C (26.1 F)
1952
-3.9 C (25.0 F)
1953
-3.9 C (25.0 F)
1954
-0.6 C (30.9 F)
1955
-2.2 C (28.0 F)
1956
-2.8 C (27.0 F)
1957
-2.2 C (28.0 F)
1958
-4.4 C (24.1 F)
1959
-1.7 C (28.9 F)
1960
-8.3 C (17.1 F)
1971
-1.7 C (28.9 F)
1972
-2.2 C (28.0 F)
1973
-3.3 C (26.1 F)
1974
-2.2 C (28.0 F)
1975
-4.4 C (24.1 F)
1976
-2.2 C (28.0 F)
1977
0.0 C (32.0 F)
1978
-2.2 C (28.0 F)
1979
0.6 C (33.1 F)
1980
0.0 C (32.0 F)
1981
-2.2 C (28.0 F)
1982
0.0 C (32.0 F)
1983
-2.2 C (28.0 F)
1984
-2.2 C (28.0 F)
1985
-7.2 C (19.0 F)
Wettest day (Rx1day)
The wettest day of the year at Zacatecas (Smn), 1929 to 1985. The record is 82.3 mm (3.2 in) in 1955, marked on the chart; the median year is 41.9 mm (1.6 in).
Wettest day (Rx1day) at Zacatecas (Smn) by year
Year
Wettest day (Rx1day)
1929
32.8 mm (1.3 in)
1930
45.0 mm (1.8 in)
1931
33.3 mm (1.3 in)
1932
46.5 mm (1.8 in)
1933
60.5 mm (2.4 in)
1934
41.9 mm (1.6 in)
1935
62.5 mm (2.5 in)
1936
25.4 mm (1.0 in)
1938
31.8 mm (1.3 in)
1939
71.9 mm (2.8 in)
1940
39.1 mm (1.5 in)
1941
41.9 mm (1.6 in)
1942
34.8 mm (1.4 in)
1943
31.0 mm (1.2 in)
1944
39.4 mm (1.6 in)
1945
39.4 mm (1.6 in)
1946
30.5 mm (1.2 in)
1947
59.9 mm (2.4 in)
1948
48.0 mm (1.9 in)
1949
36.8 mm (1.4 in)
1950
45.0 mm (1.8 in)
1951
55.4 mm (2.2 in)
1952
42.4 mm (1.7 in)
1953
35.1 mm (1.4 in)
1954
22.9 mm (0.9 in)
1955
82.3 mm (3.2 in)
1956
41.9 mm (1.6 in)
1957
36.8 mm (1.4 in)
1958
43.4 mm (1.7 in)
1959
52.1 mm (2.1 in)
1960
38.1 mm (1.5 in)
1971
45.2 mm (1.8 in)
1972
43.9 mm (1.7 in)
1973
74.9 mm (2.9 in)
1974
29.0 mm (1.1 in)
1975
56.9 mm (2.2 in)
1976
35.8 mm (1.4 in)
1977
49.8 mm (2.0 in)
1978
64.8 mm (2.6 in)
1979
39.9 mm (1.6 in)
1980
20.8 mm (0.8 in)
1981
23.6 mm (0.9 in)
1982
29.0 mm (1.1 in)
1983
43.4 mm (1.7 in)
1984
50.3 mm (2.0 in)
1985
60.2 mm (2.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Zacatecas (Smn), 1929 to 1985. The record is 122.9 mm (4.8 in) in 1930, marked on the chart; the median year is 74.9 mm (2.9 in).
Wettest five days (Rx5day) at Zacatecas (Smn) by year
Year
Wettest five days (Rx5day)
1929
54.3 mm (2.1 in)
1930
122.9 mm (4.8 in)
1931
44.7 mm (1.8 in)
1932
65.8 mm (2.6 in)
1933
74.3 mm (2.9 in)
1934
92.0 mm (3.6 in)
1935
114.0 mm (4.5 in)
1936
52.9 mm (2.1 in)
1938
87.9 mm (3.5 in)
1939
81.0 mm (3.2 in)
1940
58.2 mm (2.3 in)
1941
96.1 mm (3.8 in)
1942
63.6 mm (2.5 in)
1943
62.0 mm (2.4 in)
1944
72.7 mm (2.9 in)
1945
80.6 mm (3.2 in)
1946
39.4 mm (1.6 in)
1947
87.1 mm (3.4 in)
1948
68.3 mm (2.7 in)
1949
67.4 mm (2.7 in)
1950
103.6 mm (4.1 in)
1951
105.0 mm (4.1 in)
1952
56.4 mm (2.2 in)
1953
57.9 mm (2.3 in)
1954
53.1 mm (2.1 in)
1955
100.0 mm (3.9 in)
1956
101.1 mm (4.0 in)
1957
60.7 mm (2.4 in)
1958
80.8 mm (3.2 in)
1959
99.1 mm (3.9 in)
1960
81.6 mm (3.2 in)
1971
108.2 mm (4.3 in)
1972
69.7 mm (2.7 in)
1973
84.6 mm (3.3 in)
1974
110.5 mm (4.4 in)
1975
102.1 mm (4.0 in)
1976
109.8 mm (4.3 in)
1977
121.4 mm (4.8 in)
1978
73.4 mm (2.9 in)
1979
56.7 mm (2.2 in)
1980
25.7 mm (1.0 in)
1981
56.9 mm (2.2 in)
1982
62.0 mm (2.4 in)
1983
75.5 mm (3.0 in)
1984
82.4 mm (3.2 in)
1985
73.2 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Zacatecas (Smn), 1929 to 1985. The record is 139 days in 1960, marked on the chart; the median year is 78 days.
Longest dry spell (CDD) at Zacatecas (Smn) by year
Year
Longest dry spell (CDD)
1929
35 days
1930
65 days
1931
68 days
1932
79 days
1933
111 days
1934
93 days
1935
68 days
1936
102 days
1938
73 days
1939
53 days
1940
46 days
1941
78 days
1942
78 days
1943
122 days
1944
52 days
1945
46 days
1946
51 days
1947
115 days
1948
96 days
1949
65 days
1950
128 days
1951
79 days
1952
132 days
1953
92 days
1954
103 days
1955
119 days
1956
60 days
1957
114 days
1958
70 days
1959
97 days
1960
139 days
1971
132 days
1972
76 days
1973
123 days
1974
75 days
1975
134 days
1976
73 days
1977
71 days
1978
83 days
1979
70 days
1980
50 days
1981
31 days
1982
52 days
1983
72 days
1984
103 days
1985
81 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
25 years with a frost
Across 25 years with a frost, the median last spring frost at Zacatecas (Smn) falls on 15 February and the median first autumn frost on 9 December, which leaves a median of 295 days between them.
Fitted over all years, the growing season changes by +5.2 days per decade at this station.
Frost dates and growing season at Zacatecas (Smn)
Measure
Median, all years
Earliest period
Recent period (1930 to 1985)
Recent against earliest
Fitted trend
Last spring frost
15 February
n/a
15 February
n/a
-2.4 days per decade
First autumn frost
9 December
n/a
9 December
n/a
+2.7 days per decade
Growing days
295 days
n/a
295 days
n/a
+5.2 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
39 years, 1930 to 1985
A day with at least 42.9 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 88.9 mm (3.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Zacatecas (Smn): the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
42.9 mm (1.7 in)
5 years
55.0 mm (2.2 in)
10 years
63.1 mm (2.5 in)
25 years
73.4 mm (2.9 in)
50 years
81.2 mm (3.2 in)
Longer than the 39 years of record
100 years
88.9 mm (3.5 in)
Longer than the 39 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, 39 years of values from 1930 to 1985.
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: 82.3 mm (3.2 in) in 1955; 74.9 mm (2.9 in) in 1973; 71.9 mm (2.8 in) in 1939.
Download the Data
Data for Zacatecas (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Zacatecas (Smn) 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.