Record envelope, standing records and threshold days for Grand Canyon HQ (USC00023591), Arizona, United States, with 55 years of record.
Key Facts for Grand Canyon HQ
Grand Canyon HQ (USC00023591) is a weather station in Arizona, United States at 36.05 latitude and -112.13 longitude, 2,101 m (6,893 ft) above sea level.
The station reports from 1903 to 1957, 55 years of record.
1,464 records set at Grand Canyon HQ still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Grand Canyon HQ tied a daily record high minimum temperature of 15.6 C (60.1 F) on 5 August 1957.
About the Station
Location: Arizona, United States, 36.05 latitude, -112.13 longitude.
Elevation: 2,101 m (6,893 ft).
Period of record: 1903 to 1957, 55 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
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 Grand Canyon HQ. 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 Grand Canyon HQ, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
20.0 C (68.0 F)
-28.9 C (-20.0 F)
n/a
n/a
Feb
18.3 C (64.9 F)
-27.2 C (-17.0 F)
n/a
n/a
Mar
22.8 C (73.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Apr
27.8 C (82.0 F)
-12.8 C (9.0 F)
n/a
n/a
May
31.7 C (89.1 F)
-12.2 C (10.0 F)
n/a
n/a
Jun
36.7 C (98.1 F)
-3.3 C (26.1 F)
n/a
n/a
Jul
36.7 C (98.1 F)
1.7 C (35.1 F)
n/a
n/a
Aug
35.6 C (96.1 F)
1.7 C (35.1 F)
n/a
n/a
Sep
33.9 C (93.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
27.8 C (82.0 F)
-10.6 C (12.9 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-18.3 C (-0.9 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Grand Canyon HQ still stand. 1906 holds the most, with 104.
Standing records at Grand Canyon HQ by the year they were set
Year set
Standing records
1903
21
1904
10
1905
19
1906
104
1907
45
1908
28
1909
3
1910
3
1911
30
1912
39
1913
59
1914
33
1915
37
1916
38
1917
50
1918
16
1919
25
1920
22
1921
34
1922
31
1923
20
1924
61
1925
36
1926
18
1927
19
1928
13
1929
12
1930
31
1931
22
1932
32
1933
46
1934
35
1935
23
1936
23
1937
36
1938
27
1939
21
1940
13
1941
7
1942
12
1943
17
1944
13
1945
16
1946
18
1947
24
1948
17
1949
35
1950
13
1951
29
1952
24
1953
20
1954
17
1955
31
1956
21
1957
15
All-Time Record Progression
3 new records
3 all-time records were set at Grand Canyon HQ between 24 January 1949 and 1 July 1953. Each dot is a new record.
When Grand Canyon HQ set new all-time records
Date
Kind
Detail
1949-01-24
Record snow depth
Record snow depth 94.0 cm (37.0 in)
1949-01-25
Record snow depth
Record snow depth 96.5 cm (38.0 in)
1953-07-01
Record high minimum temperature
Record high minimum temperature 21.7 C (71.1 F)
Wettest Day of Each Month
Sep: 68.6 mm (2.7 in)
The wettest day on record for each calendar month at Grand Canyon HQ. The most was 68.6 mm (2.7 in) on 29 September 1937.
Record daily precipitation for each month at Grand Canyon HQ
Month
Record daily precipitation (mm)
Date
Jan
38.1 mm (1.5 in)
17 January 1914
Feb
31.8 mm (1.3 in)
9 February 1932
Mar
35.6 mm (1.4 in)
14 March 1944
Apr
37.8 mm (1.5 in)
8 April 1926
May
22.9 mm (0.9 in)
27 May 1907
Jun
56.4 mm (2.2 in)
13 June 1955
Jul
50.8 mm (2.0 in)
30 July 1904
Aug
56.1 mm (2.2 in)
29 August 1951
Sep
68.6 mm (2.7 in)
29 September 1937
Oct
50.8 mm (2.0 in)
6 October 1916
Nov
44.5 mm (1.8 in)
26 November 1919
Dec
48.3 mm (1.9 in)
27 December 1923
Period of Record Coverage
1903 to 1957
Complete yearUnder 90 percent of days
55 years of record at Grand Canyon HQ, 1903 to 1957. 12 years have data for under 90 percent of days and are left out of rankings: 1903, 1904, 1905, 1906, 1907, 1908, 1909, 1910 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Grand Canyon HQ, 1913 to 1956. Blue stripes are years cooler than the station's own mean of 9.4 C (49.0 F); red stripes are warmer. The coolest year was 1915, at 7.8 C (46.0 F), and the warmest was 1934, at 11.1 C (52.0 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at Grand Canyon HQ as warming stripes, 1913 to 1956
Year
Annual mean temperature
Difference from the station mean
1913
8.1 C
-1.34 C
1914
9.1 C
-0.38 C
1915
7.8 C
-1.68 C
1916
8.0 C
-1.47 C
1917
8.4 C
-1.07 C
1918
8.6 C
-0.85 C
1919
8.7 C
-0.70 C
1921
9.1 C
-0.39 C
1922
8.9 C
-0.53 C
1924
9.4 C
-0.03 C
1925
9.3 C
-0.19 C
1926
10.0 C
+0.56 C
1927
9.8 C
+0.33 C
1928
10.2 C
+0.73 C
1929
9.6 C
+0.15 C
1930
9.1 C
-0.36 C
1931
9.9 C
+0.49 C
1932
9.9 C
+0.45 C
1933
10.4 C
+0.96 C
1934
11.1 C
+1.68 C
1935
9.5 C
+0.09 C
1936
9.9 C
+0.49 C
1937
9.7 C
+0.22 C
1938
9.5 C
+0.02 C
1939
9.9 C
+0.46 C
1940
10.3 C
+0.86 C
1941
8.8 C
-0.61 C
1942
10.0 C
+0.52 C
1943
10.4 C
+0.95 C
1944
9.0 C
-0.46 C
1945
9.5 C
+0.01 C
1946
9.5 C
+0.01 C
1947
9.6 C
+0.11 C
1948
9.2 C
-0.21 C
1949
8.2 C
-1.20 C
1950
10.4 C
+0.98 C
1951
9.3 C
-0.13 C
1952
8.9 C
-0.52 C
1953
9.9 C
+0.50 C
1954
10.5 C
+1.10 C
1955
9.2 C
-0.22 C
1956
10.0 C
+0.57 C
The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1913 to 1956. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Grand Canyon HQ
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.3 C (0.1 to 0.4) per decade
0.5 F (0.2 to 0.8) per decade
1913 to 1956
42
Rise
Mean daily maximum
0.05 C (-0.16 to 0.25) per decade
0.1 F (-0.3 to 0.4) per decade
1913 to 1956
42
Not clearly different from zero
Mean daily minimum
0.5 C (0.2 to 0.7) per decade
0.8 F (0.4 to 1.3) per decade
1913 to 1956
42
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
1903 to 1957
Yearly extremes at Grand Canyon HQ: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
36.7 C (98.1 F)
1925
34.4 C (93.9 F)
55
Coldest night (TNn)
-28.9 C (-20.0 F)
1919
-18.9 C (-2.0 F)
55
Wettest day (Rx1day)
68.6 mm (2.7 in)
1937
32.0 mm (1.3 in)
55
Wettest five days (Rx5day)
139.8 mm (5.5 in)
1939
52.5 mm (2.1 in)
55
Longest dry spell (CDD)
123 days
1904
47 days
55
Hottest day (TXx)
The hottest day of the year at Grand Canyon HQ, 1903 to 1957. The record is 36.7 C (98.1 F) in 1925, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Grand Canyon HQ by year
Year
Hottest day (TXx)
1903
26.7 C (80.1 F)
1904
35.0 C (95.0 F)
1905
32.2 C (90.0 F)
1906
35.6 C (96.1 F)
1907
35.6 C (96.1 F)
1908
28.9 C (84.0 F)
1909
31.1 C (88.0 F)
1910
30.0 C (86.0 F)
1911
28.3 C (82.9 F)
1912
30.0 C (86.0 F)
1913
33.3 C (91.9 F)
1914
32.2 C (90.0 F)
1915
31.1 C (88.0 F)
1916
31.1 C (88.0 F)
1917
34.4 C (93.9 F)
1918
33.9 C (93.0 F)
1919
34.4 C (93.9 F)
1920
36.1 C (97.0 F)
1921
32.2 C (90.0 F)
1922
36.1 C (97.0 F)
1923
33.9 C (93.0 F)
1924
35.0 C (95.0 F)
1925
36.7 C (98.1 F)
1926
34.4 C (93.9 F)
1927
33.3 C (91.9 F)
1928
34.4 C (93.9 F)
1929
35.0 C (95.0 F)
1930
33.3 C (91.9 F)
1931
35.0 C (95.0 F)
1932
36.1 C (97.0 F)
1933
36.7 C (98.1 F)
1934
35.0 C (95.0 F)
1935
32.8 C (91.0 F)
1936
34.4 C (93.9 F)
1937
35.0 C (95.0 F)
1938
35.6 C (96.1 F)
1939
35.6 C (96.1 F)
1940
35.6 C (96.1 F)
1941
32.8 C (91.0 F)
1942
35.6 C (96.1 F)
1943
33.9 C (93.0 F)
1944
33.3 C (91.9 F)
1945
35.0 C (95.0 F)
1946
32.8 C (91.0 F)
1947
33.9 C (93.0 F)
1948
33.3 C (91.9 F)
1949
34.4 C (93.9 F)
1950
35.6 C (96.1 F)
1951
34.4 C (93.9 F)
1952
32.2 C (90.0 F)
1953
36.1 C (97.0 F)
1954
35.6 C (96.1 F)
1955
32.2 C (90.0 F)
1956
35.0 C (95.0 F)
1957
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Grand Canyon HQ, 1903 to 1957. The record is -28.9 C (-20.0 F) in 1919, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Grand Canyon HQ by year
Year
Coldest night (TNn)
1903
-6.7 C (19.9 F)
1904
-18.9 C (-2.0 F)
1905
-25.6 C (-14.1 F)
1906
-18.9 C (-2.0 F)
1907
-15.6 C (3.9 F)
1908
-17.2 C (1.0 F)
1909
-7.2 C (19.0 F)
1910
-0.6 C (30.9 F)
1911
-25.6 C (-14.1 F)
1912
-24.4 C (-11.9 F)
1913
-28.3 C (-18.9 F)
1914
-25.0 C (-13.0 F)
1915
-23.9 C (-11.0 F)
1916
-28.3 C (-18.9 F)
1917
-24.4 C (-11.9 F)
1918
-22.8 C (-9.0 F)
1919
-28.9 C (-20.0 F)
1920
-19.4 C (-2.9 F)
1921
-16.1 C (3.0 F)
1922
-27.2 C (-17.0 F)
1923
-16.7 C (1.9 F)
1924
-22.8 C (-9.0 F)
1925
-22.8 C (-9.0 F)
1926
-21.1 C (-6.0 F)
1927
-17.8 C (0.0 F)
1928
-17.2 C (1.0 F)
1929
-21.7 C (-7.1 F)
1930
-20.6 C (-5.1 F)
1931
-20.6 C (-5.1 F)
1932
-17.8 C (0.0 F)
1933
-25.6 C (-14.1 F)
1934
-13.3 C (8.1 F)
1935
-21.1 C (-6.0 F)
1936
-13.3 C (8.1 F)
1937
-24.4 C (-11.9 F)
1938
-13.9 C (7.0 F)
1939
-18.9 C (-2.0 F)
1940
-16.1 C (3.0 F)
1941
-14.4 C (6.1 F)
1942
-19.4 C (-2.9 F)
1943
-20.6 C (-5.1 F)
1944
-16.1 C (3.0 F)
1945
-18.9 C (-2.0 F)
1946
-18.3 C (-0.9 F)
1947
-18.3 C (-0.9 F)
1948
-20.6 C (-5.1 F)
1949
-26.7 C (-16.1 F)
1950
-16.1 C (3.0 F)
1951
-20.0 C (-4.0 F)
1952
-18.9 C (-2.0 F)
1953
-15.0 C (5.0 F)
1954
-15.0 C (5.0 F)
1955
-22.8 C (-9.0 F)
1956
-16.1 C (3.0 F)
1957
-17.2 C (1.0 F)
Wettest day (Rx1day)
The wettest day of the year at Grand Canyon HQ, 1903 to 1957. The record is 68.6 mm (2.7 in) in 1937, marked on the chart; the median year is 32.0 mm (1.3 in).
Wettest day (Rx1day) at Grand Canyon HQ by year
Year
Wettest day (Rx1day)
1903
1.5 mm (0.06 in)
1904
50.8 mm (2.0 in)
1905
35.6 mm (1.4 in)
1906
27.9 mm (1.1 in)
1907
50.8 mm (2.0 in)
1908
26.9 mm (1.1 in)
1909
20.8 mm (0.8 in)
1910
15.7 mm (0.6 in)
1911
39.9 mm (1.6 in)
1912
30.5 mm (1.2 in)
1913
38.1 mm (1.5 in)
1914
38.1 mm (1.5 in)
1915
23.9 mm (0.9 in)
1916
50.8 mm (2.0 in)
1917
20.8 mm (0.8 in)
1918
32.0 mm (1.3 in)
1919
44.5 mm (1.8 in)
1920
17.8 mm (0.7 in)
1921
31.2 mm (1.2 in)
1922
33.5 mm (1.3 in)
1923
48.3 mm (1.9 in)
1924
38.1 mm (1.5 in)
1925
48.8 mm (1.9 in)
1926
37.8 mm (1.5 in)
1927
31.2 mm (1.2 in)
1928
25.1 mm (1.0 in)
1929
25.9 mm (1.0 in)
1930
33.0 mm (1.3 in)
1931
23.4 mm (0.9 in)
1932
31.8 mm (1.3 in)
1933
32.3 mm (1.3 in)
1934
29.7 mm (1.2 in)
1935
27.9 mm (1.1 in)
1936
27.9 mm (1.1 in)
1937
68.6 mm (2.7 in)
1938
23.9 mm (0.9 in)
1939
41.9 mm (1.6 in)
1940
40.9 mm (1.6 in)
1941
26.4 mm (1.0 in)
1942
36.1 mm (1.4 in)
1943
20.6 mm (0.8 in)
1944
35.6 mm (1.4 in)
1945
38.9 mm (1.5 in)
1946
36.1 mm (1.4 in)
1947
21.1 mm (0.8 in)
1948
31.2 mm (1.2 in)
1949
31.8 mm (1.3 in)
1950
41.1 mm (1.6 in)
1951
56.1 mm (2.2 in)
1952
33.0 mm (1.3 in)
1953
32.0 mm (1.3 in)
1954
26.7 mm (1.1 in)
1955
56.4 mm (2.2 in)
1956
26.4 mm (1.0 in)
1957
19.1 mm (0.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Grand Canyon HQ, 1903 to 1957. The record is 139.8 mm (5.5 in) in 1939, marked on the chart; the median year is 52.5 mm (2.1 in).
Wettest five days (Rx5day) at Grand Canyon HQ by year
Year
Wettest five days (Rx5day)
1903
3.6 mm (0.14 in)
1904
88.9 mm (3.5 in)
1905
70.1 mm (2.8 in)
1906
94.2 mm (3.7 in)
1907
115.0 mm (4.5 in)
1908
103.1 mm (4.1 in)
1909
44.7 mm (1.8 in)
1910
23.8 mm (0.9 in)
1911
64.0 mm (2.5 in)
1912
73.7 mm (2.9 in)
1913
55.9 mm (2.2 in)
1914
50.8 mm (2.0 in)
1915
39.4 mm (1.6 in)
1916
56.2 mm (2.2 in)
1917
37.0 mm (1.5 in)
1918
72.3 mm (2.8 in)
1919
69.9 mm (2.8 in)
1920
40.2 mm (1.6 in)
1921
45.2 mm (1.8 in)
1922
46.2 mm (1.8 in)
1923
58.9 mm (2.3 in)
1924
51.4 mm (2.0 in)
1925
65.3 mm (2.6 in)
1926
57.7 mm (2.3 in)
1927
86.5 mm (3.4 in)
1928
53.6 mm (2.1 in)
1929
38.3 mm (1.5 in)
1930
40.9 mm (1.6 in)
1931
51.6 mm (2.0 in)
1932
61.2 mm (2.4 in)
1933
52.1 mm (2.1 in)
1934
33.8 mm (1.3 in)
1935
43.7 mm (1.7 in)
1936
48.6 mm (1.9 in)
1937
71.9 mm (2.8 in)
1938
72.6 mm (2.9 in)
1939
139.8 mm (5.5 in)
1940
62.5 mm (2.5 in)
1941
41.9 mm (1.6 in)
1942
39.4 mm (1.6 in)
1943
35.6 mm (1.4 in)
1944
46.2 mm (1.8 in)
1945
69.4 mm (2.7 in)
1946
42.5 mm (1.7 in)
1947
44.4 mm (1.7 in)
1948
40.3 mm (1.6 in)
1949
52.5 mm (2.1 in)
1950
44.4 mm (1.7 in)
1951
75.9 mm (3.0 in)
1952
78.2 mm (3.1 in)
1953
64.5 mm (2.5 in)
1954
59.3 mm (2.3 in)
1955
64.6 mm (2.5 in)
1956
26.7 mm (1.1 in)
1957
49.6 mm (2.0 in)
Longest dry spell (CDD)
The longest dry spell of the year at Grand Canyon HQ, 1903 to 1957. The record is 123 days in 1904, marked on the chart; the median year is 47 days.
Longest dry spell (CDD) at Grand Canyon HQ by year
Year
Longest dry spell (CDD)
1903
93 days
1904
123 days
1905
21 days
1906
62 days
1907
30 days
1908
42 days
1909
34 days
1910
14 days
1911
49 days
1912
62 days
1913
103 days
1914
59 days
1915
47 days
1916
95 days
1917
91 days
1918
62 days
1919
37 days
1920
35 days
1921
30 days
1922
46 days
1923
51 days
1924
61 days
1925
41 days
1926
35 days
1927
37 days
1928
42 days
1929
77 days
1930
34 days
1931
32 days
1932
39 days
1933
48 days
1934
49 days
1935
52 days
1936
56 days
1937
62 days
1938
38 days
1939
53 days
1940
28 days
1941
44 days
1942
75 days
1943
88 days
1944
43 days
1945
59 days
1946
36 days
1947
32 days
1948
39 days
1949
45 days
1950
64 days
1951
61 days
1952
47 days
1953
43 days
1954
44 days
1955
49 days
1956
49 days
1957
20 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Grand Canyon HQ falls on 28 May and the median first autumn frost on 7 October, which leaves a median of 144 days between them.
Fitted over all years, the growing season changes by +3.5 days per decade at this station.
Frost dates and growing season at Grand Canyon HQ
Measure
Median, all years
Earliest period
Recent period (1927 to 1956)
Recent against earliest
Fitted trend
Last spring frost
28 May
n/a
23 May
n/a
+0.2 days per decade
First autumn frost
7 October
n/a
12 October
n/a
+3.7 days per decade
Growing days
144 days
n/a
147 days
n/a
+3.5 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
47 years, 1904 to 1956
A day with at least 32.6 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 71.2 mm (2.8 in) of rain is expected about once in 100 years.
Rainfall return levels at Grand Canyon HQ: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
32.6 mm (1.3 in)
5 years
42.2 mm (1.7 in)
10 years
48.9 mm (1.9 in)
25 years
57.6 mm (2.3 in)
50 years
64.3 mm (2.5 in)
Longer than the 47 years of record
100 years
71.2 mm (2.8 in)
Longer than the 47 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, 47 years of values from 1904 to 1956.
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: 68.6 mm (2.7 in) in 1937; 56.4 mm (2.2 in) in 1955; 56.1 mm (2.2 in) in 1951.
Station Changes
2 suspected
2 changes were suspected in the annual mean temperature of Grand Canyon HQ, at 1926 and 1934. Each is measured against neighbouring stations.
Relative to 5 neighbouring stations, the station's annual mean temperature from 1926 ran 0.9 C (1.5 F) higher than in the years before (likely change).
Relative to 5 neighbouring stations, the station's annual mean temperature from 1934 ran 0.5 C (0.8 F) lower than in the years before (likely change).
Suspected changes in the annual mean temperature at Grand Canyon HQ, against neighbouring stations
Year
Shift (C)
Shift (F)
Strength
Neighbours
1926
+0.9
+1.5
likely
5
1934
-0.4
-0.8
likely
5
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Data for Grand Canyon HQ standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Grand Canyon HQ 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.