Record envelope, standing records and threshold days for Haxby 18 SW (USC00244007), Montana, United States, with 70 years of record.
Key Facts for Haxby 18 SW
Haxby 18 SW (USC00244007) is a weather station in Montana, United States at 47.57 latitude and -106.70 longitude, 808 m (2,651 ft) above sea level.
The station reports from 1922 to 1991, 70 years of record.
1,464 records set at Haxby 18 SW still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Haxby 18 SW tied a daily record low minimum temperature of 6.7 C (44.1 F) on 24 July 1991.
About the Station
Location: Montana, United States, 47.57 latitude, -106.70 longitude.
Elevation: 808 m (2,651 ft).
Period of record: 1922 to 1991, 70 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 Haxby 18 SW. 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 Haxby 18 SW, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
18.3 C (64.9 F)
-42.2 C (-44.0 F)
n/a
n/a
Feb
22.2 C (72.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Mar
26.7 C (80.1 F)
-34.4 C (-29.9 F)
n/a
n/a
Apr
33.3 C (91.9 F)
-20.6 C (-5.1 F)
n/a
n/a
May
38.3 C (100.9 F)
-11.7 C (10.9 F)
n/a
n/a
Jun
43.3 C (109.9 F)
-2.2 C (28.0 F)
n/a
n/a
Jul
43.3 C (109.9 F)
0.6 C (33.1 F)
n/a
n/a
Aug
42.8 C (109.0 F)
-1.1 C (30.0 F)
n/a
n/a
Sep
40.6 C (105.1 F)
-10.0 C (14.0 F)
n/a
n/a
Oct
32.2 C (90.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Nov
25.6 C (78.1 F)
-33.9 C (-29.0 F)
n/a
n/a
Dec
22.8 C (73.0 F)
-41.7 C (-43.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Haxby 18 SW still stand. 1936 holds the most, with 78.
Standing records at Haxby 18 SW by the year they were set
Year set
Standing records
1922
23
1923
17
1924
17
1925
37
1926
32
1927
25
1928
28
1929
25
1930
29
1931
46
1932
26
1933
20
1934
47
1935
25
1936
78
1937
24
1938
16
1939
42
1940
22
1941
17
1942
17
1943
21
1944
14
1945
22
1946
12
1947
19
1948
24
1949
26
1950
1
1951
30
1952
11
1953
13
1954
32
1955
16
1956
17
1957
13
1958
14
1959
15
1960
15
1961
15
1962
21
1963
14
1964
13
1965
30
1966
17
1967
15
1968
17
1969
16
1970
9
1971
11
1972
27
1973
13
1974
16
1975
6
1976
9
1977
16
1978
10
1979
11
1980
16
1981
20
1982
22
1983
24
1984
12
1985
38
1986
16
1987
26
1988
24
1989
19
1990
19
1991
14
All-Time Record Progression
3 new records
3 all-time records were set at Haxby 18 SW between 20 January 1954 and 20 June 1991. Each dot is a new record.
When Haxby 18 SW set new all-time records
Date
Kind
Detail
1954-01-20
Record low minimum temperature
Record low minimum temperature -42.2 C (-44.0 F)
1964-06-18
Record daily precipitation
Record daily precipitation 78.5 mm (3.1 in)
1991-06-20
Record daily precipitation
Record daily precipitation 84.3 mm (3.3 in)
Wettest Day of Each Month
Jun: 84.3 mm (3.3 in)
The wettest day on record for each calendar month at Haxby 18 SW. The most was 84.3 mm (3.3 in) on 20 June 1991.
Record daily precipitation for each month at Haxby 18 SW
Month
Record daily precipitation (mm)
Date
Jan
13.7 mm (0.5 in)
31 January 1939
Feb
11.4 mm (0.4 in)
15 February 1953
Mar
21.1 mm (0.8 in)
11 March 1931
Apr
50.5 mm (2.0 in)
25 April 1969
May
59.2 mm (2.3 in)
29 May 1953
Jun
84.3 mm (3.3 in)
20 June 1991
Jul
54.4 mm (2.1 in)
31 July 1975
Aug
69.1 mm (2.7 in)
8 August 1948
Sep
70.1 mm (2.8 in)
25 September 1986
Oct
41.1 mm (1.6 in)
8 October 1975
Nov
29.5 mm (1.2 in)
15 November 1958
Dec
16.8 mm (0.7 in)
10 December 1933
Period of Record Coverage
1922 to 1991
Complete yearUnder 90 percent of days
70 years of record at Haxby 18 SW, 1922 to 1991. 8 years have data for under 90 percent of days and are left out of rankings: 1922, 1950, 1962, 1963, 1964, 1966, 1967, 1991.
Cooler than the station meanWarmer than the station mean
One stripe for each of 60 complete years at Haxby 18 SW, 1923 to 1990. Blue stripes are years cooler than the station's own mean of 6.7 C (44.0 F); red stripes are warmer. The coolest year was 1951, at 3.8 C (38.8 F), and the warmest was 1931, at 9.0 C (48.2 F). The strongest colour marks a difference of 2.9 C (5.2 F).
Annual mean temperature at Haxby 18 SW as warming stripes, 1923 to 1990
Year
Annual mean temperature
Difference from the station mean
1923
7.5 C
+0.88 C
1924
5.6 C
-1.05 C
1925
7.2 C
+0.58 C
1926
7.9 C
+1.20 C
1927
5.4 C
-1.21 C
1928
7.8 C
+1.12 C
1929
5.6 C
-1.02 C
1930
7.4 C
+0.71 C
1931
9.0 C
+2.37 C
1932
6.2 C
-0.48 C
1933
7.2 C
+0.55 C
1934
8.8 C
+2.14 C
1935
6.6 C
-0.05 C
1936
6.3 C
-0.33 C
1937
6.5 C
-0.20 C
1938
7.9 C
+1.25 C
1939
8.2 C
+1.56 C
1940
7.1 C
+0.46 C
1941
8.0 C
+1.37 C
1942
7.1 C
+0.42 C
1943
6.8 C
+0.15 C
1944
7.1 C
+0.49 C
1945
6.2 C
-0.43 C
1946
7.3 C
+0.62 C
1947
6.4 C
-0.25 C
1948
7.3 C
+0.63 C
1949
6.9 C
+0.20 C
1951
3.8 C
-2.85 C
1952
5.6 C
-1.03 C
1953
7.3 C
+0.62 C
1954
6.4 C
-0.29 C
1955
5.1 C
-1.54 C
1956
5.9 C
-0.74 C
1957
5.8 C
-0.88 C
1958
7.2 C
+0.58 C
1959
5.7 C
-0.95 C
1960
6.1 C
-0.59 C
1961
7.3 C
+0.69 C
1964
5.6 C
-1.09 C
1968
6.0 C
-0.64 C
1970
5.6 C
-1.05 C
1971
5.8 C
-0.85 C
1972
5.2 C
-1.50 C
1974
7.2 C
+0.55 C
1975
5.8 C
-0.89 C
1976
7.5 C
+0.85 C
1977
6.5 C
-0.20 C
1978
4.5 C
-2.20 C
1979
5.3 C
-1.36 C
1980
7.4 C
+0.74 C
1981
8.3 C
+1.61 C
1982
4.7 C
-2.00 C
1983
6.9 C
+0.23 C
1984
6.8 C
+0.19 C
1985
5.4 C
-1.28 C
1986
7.9 C
+1.25 C
1987
8.6 C
+1.97 C
1988
7.8 C
+1.14 C
1989
5.7 C
-0.93 C
1990
7.6 C
+0.90 C
The fitted trend in annual mean temperature here over 1923 to 1990 is -0.09 C (-0.23 to 0.05) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.2 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Haxby 18 SW
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.09 C (-0.23 to 0.05) per decade
-0.2 F (-0.4 to 0.1) per decade
1923 to 1990
60
Not clearly different from zero
Mean daily maximum
0.20 C (0.05 to 0.36) per decade
0.4 F (0.1 to 0.6) per decade
1923 to 1990
60
Rise
Mean daily minimum
-0.4 C (-0.5 to -0.2) per decade
-0.7 F (-1.0 to -0.4) per decade
1923 to 1990
60
Fall
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
1922 to 1991
Yearly extremes at Haxby 18 SW: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
43.3 C (109.9 F)
1937
38.9 C (102.0 F)
70
Coldest night (TNn)
-42.2 C (-44.0 F)
1954
-35.0 C (-31.0 F)
70
Wettest day (Rx1day)
84.3 mm (3.3 in)
1991
37.9 mm (1.5 in)
70
Wettest five days (Rx5day)
114.8 mm (4.5 in)
1943
53.1 mm (2.1 in)
70
Longest dry spell (CDD)
81 days
1973
35 days
70
Hottest day (TXx)
The hottest day of the year at Haxby 18 SW, 1922 to 1991. The record is 43.3 C (109.9 F) in 1937, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Haxby 18 SW by year
Year
Hottest day (TXx)
1922
37.2 C (99.0 F)
1923
37.8 C (100.0 F)
1924
38.3 C (100.9 F)
1925
41.1 C (106.0 F)
1926
41.1 C (106.0 F)
1927
35.0 C (95.0 F)
1928
37.2 C (99.0 F)
1929
40.6 C (105.1 F)
1930
40.6 C (105.1 F)
1931
42.2 C (108.0 F)
1932
37.8 C (100.0 F)
1933
41.7 C (107.1 F)
1934
40.6 C (105.1 F)
1935
40.6 C (105.1 F)
1936
42.8 C (109.0 F)
1937
43.3 C (109.9 F)
1938
36.7 C (98.1 F)
1939
40.0 C (104.0 F)
1940
40.0 C (104.0 F)
1941
41.7 C (107.1 F)
1942
38.3 C (100.9 F)
1943
38.3 C (100.9 F)
1944
36.7 C (98.1 F)
1945
39.4 C (102.9 F)
1946
37.8 C (100.0 F)
1947
41.1 C (106.0 F)
1948
38.9 C (102.0 F)
1949
41.7 C (107.1 F)
1950
16.7 C (62.1 F)
1951
39.4 C (102.9 F)
1952
37.8 C (100.0 F)
1953
37.2 C (99.0 F)
1954
37.2 C (99.0 F)
1955
38.9 C (102.0 F)
1956
37.2 C (99.0 F)
1957
37.8 C (100.0 F)
1958
39.4 C (102.9 F)
1959
40.0 C (104.0 F)
1960
41.1 C (106.0 F)
1961
40.0 C (104.0 F)
1962
36.1 C (97.0 F)
1963
41.1 C (106.0 F)
1964
38.9 C (102.0 F)
1965
37.2 C (99.0 F)
1966
41.1 C (106.0 F)
1967
37.8 C (100.0 F)
1968
38.9 C (102.0 F)
1969
38.3 C (100.9 F)
1970
38.9 C (102.0 F)
1971
40.6 C (105.1 F)
1972
37.2 C (99.0 F)
1973
39.4 C (102.9 F)
1974
39.4 C (102.9 F)
1975
39.4 C (102.9 F)
1976
37.8 C (100.0 F)
1977
37.2 C (99.0 F)
1978
37.8 C (100.0 F)
1979
37.8 C (100.0 F)
1980
40.0 C (104.0 F)
1981
40.6 C (105.1 F)
1982
36.1 C (97.0 F)
1983
42.8 C (109.0 F)
1984
39.4 C (102.9 F)
1985
41.1 C (106.0 F)
1986
38.3 C (100.9 F)
1987
36.7 C (98.1 F)
1988
43.3 C (109.9 F)
1989
38.9 C (102.0 F)
1990
40.0 C (104.0 F)
1991
35.6 C (96.1 F)
Coldest night (TNn)
The coldest night of the year at Haxby 18 SW, 1922 to 1991. The record is -42.2 C (-44.0 F) in 1954, marked on the chart; the median year is -35.0 C (-31.0 F).
Coldest night (TNn) at Haxby 18 SW by year
Year
Coldest night (TNn)
1922
-31.1 C (-24.0 F)
1923
-33.3 C (-27.9 F)
1924
-34.4 C (-29.9 F)
1925
-35.6 C (-32.1 F)
1926
-27.8 C (-18.0 F)
1927
-35.0 C (-31.0 F)
1928
-36.7 C (-34.1 F)
1929
-38.3 C (-36.9 F)
1930
-34.4 C (-29.9 F)
1931
-23.3 C (-9.9 F)
1932
-31.7 C (-25.1 F)
1933
-37.2 C (-35.0 F)
1934
-29.4 C (-20.9 F)
1935
-33.3 C (-27.9 F)
1936
-39.4 C (-38.9 F)
1937
-35.6 C (-32.1 F)
1938
-30.0 C (-22.0 F)
1939
-36.7 C (-34.1 F)
1940
-30.6 C (-23.1 F)
1941
-26.7 C (-16.1 F)
1942
-31.1 C (-24.0 F)
1943
-36.7 C (-34.1 F)
1944
-26.7 C (-16.1 F)
1945
-31.1 C (-24.0 F)
1946
-27.8 C (-18.0 F)
1947
-32.2 C (-26.0 F)
1948
-27.8 C (-18.0 F)
1949
-33.3 C (-27.9 F)
1950
-31.1 C (-24.0 F)
1951
-38.9 C (-38.0 F)
1952
-36.7 C (-34.1 F)
1953
-30.0 C (-22.0 F)
1954
-42.2 C (-44.0 F)
1955
-34.4 C (-29.9 F)
1956
-37.8 C (-36.0 F)
1957
-41.1 C (-42.0 F)
1958
-35.0 C (-31.0 F)
1959
-34.4 C (-29.9 F)
1960
-34.4 C (-29.9 F)
1961
-31.1 C (-24.0 F)
1962
-39.4 C (-38.9 F)
1963
-40.0 C (-40.0 F)
1964
-34.4 C (-29.9 F)
1965
-33.3 C (-27.9 F)
1966
-33.3 C (-27.9 F)
1967
-31.7 C (-25.1 F)
1968
-36.1 C (-33.0 F)
1969
-42.2 C (-44.0 F)
1970
-38.3 C (-36.9 F)
1971
-40.0 C (-40.0 F)
1972
-39.4 C (-38.9 F)
1973
-30.6 C (-23.1 F)
1974
-37.8 C (-36.0 F)
1975
-30.6 C (-23.1 F)
1976
-36.1 C (-33.0 F)
1977
-40.0 C (-40.0 F)
1978
-35.6 C (-32.1 F)
1979
-37.8 C (-36.0 F)
1980
-36.7 C (-34.1 F)
1981
-31.1 C (-24.0 F)
1982
-40.0 C (-40.0 F)
1983
-40.0 C (-40.0 F)
1984
-36.7 C (-34.1 F)
1985
-38.3 C (-36.9 F)
1986
-37.2 C (-35.0 F)
1987
-26.7 C (-16.1 F)
1988
-34.4 C (-29.9 F)
1989
-41.7 C (-43.1 F)
1990
-41.1 C (-42.0 F)
1991
-36.7 C (-34.1 F)
Wettest day (Rx1day)
The wettest day of the year at Haxby 18 SW, 1922 to 1991. The record is 84.3 mm (3.3 in) in 1991, marked on the chart; the median year is 37.9 mm (1.5 in).
Wettest day (Rx1day) at Haxby 18 SW by year
Year
Wettest day (Rx1day)
1922
46.2 mm (1.8 in)
1923
66.0 mm (2.6 in)
1924
38.1 mm (1.5 in)
1925
64.3 mm (2.5 in)
1926
24.6 mm (1.0 in)
1927
39.9 mm (1.6 in)
1928
24.4 mm (1.0 in)
1929
21.6 mm (0.9 in)
1930
33.8 mm (1.3 in)
1931
31.5 mm (1.2 in)
1932
41.4 mm (1.6 in)
1933
41.4 mm (1.6 in)
1934
21.1 mm (0.8 in)
1935
48.3 mm (1.9 in)
1936
21.1 mm (0.8 in)
1937
38.9 mm (1.5 in)
1938
30.2 mm (1.2 in)
1939
41.4 mm (1.6 in)
1940
38.1 mm (1.5 in)
1941
54.4 mm (2.1 in)
1942
38.9 mm (1.5 in)
1943
53.1 mm (2.1 in)
1944
60.2 mm (2.4 in)
1945
17.8 mm (0.7 in)
1946
38.1 mm (1.5 in)
1947
26.7 mm (1.1 in)
1948
69.1 mm (2.7 in)
1949
13.0 mm (0.5 in)
1950
2.5 mm (0.10 in)
1951
21.6 mm (0.9 in)
1952
12.7 mm (0.5 in)
1953
59.2 mm (2.3 in)
1954
41.1 mm (1.6 in)
1955
31.8 mm (1.3 in)
1956
30.5 mm (1.2 in)
1957
18.8 mm (0.7 in)
1958
29.5 mm (1.2 in)
1959
24.9 mm (1.0 in)
1960
12.7 mm (0.5 in)
1961
32.0 mm (1.3 in)
1962
50.5 mm (2.0 in)
1963
35.1 mm (1.4 in)
1964
78.5 mm (3.1 in)
1965
51.1 mm (2.0 in)
1966
26.9 mm (1.1 in)
1967
40.4 mm (1.6 in)
1968
15.5 mm (0.6 in)
1969
50.5 mm (2.0 in)
1970
37.6 mm (1.5 in)
1971
29.5 mm (1.2 in)
1972
43.9 mm (1.7 in)
1973
36.6 mm (1.4 in)
1974
67.6 mm (2.7 in)
1975
54.4 mm (2.1 in)
1976
35.6 mm (1.4 in)
1977
24.1 mm (0.9 in)
1978
43.2 mm (1.7 in)
1979
15.5 mm (0.6 in)
1980
21.6 mm (0.9 in)
1981
39.1 mm (1.5 in)
1982
38.6 mm (1.5 in)
1983
21.6 mm (0.9 in)
1984
16.3 mm (0.6 in)
1985
38.1 mm (1.5 in)
1986
70.1 mm (2.8 in)
1987
39.4 mm (1.6 in)
1988
31.0 mm (1.2 in)
1989
46.5 mm (1.8 in)
1990
14.2 mm (0.6 in)
1991
84.3 mm (3.3 in)
Wettest five days (Rx5day)
The wettest five days of the year at Haxby 18 SW, 1922 to 1991. The record is 114.8 mm (4.5 in) in 1943, marked on the chart; the median year is 53.1 mm (2.1 in).
Wettest five days (Rx5day) at Haxby 18 SW by year
Year
Wettest five days (Rx5day)
1922
89.8 mm (3.5 in)
1923
114.3 mm (4.5 in)
1924
49.0 mm (1.9 in)
1925
82.1 mm (3.2 in)
1926
41.4 mm (1.6 in)
1927
75.2 mm (3.0 in)
1928
63.0 mm (2.5 in)
1929
33.6 mm (1.3 in)
1930
39.1 mm (1.5 in)
1931
43.5 mm (1.7 in)
1932
107.7 mm (4.2 in)
1933
50.5 mm (2.0 in)
1934
55.6 mm (2.2 in)
1935
55.2 mm (2.2 in)
1936
32.0 mm (1.3 in)
1937
61.7 mm (2.4 in)
1938
61.4 mm (2.4 in)
1939
65.6 mm (2.6 in)
1940
56.8 mm (2.2 in)
1941
74.9 mm (2.9 in)
1942
46.8 mm (1.8 in)
1943
114.8 mm (4.5 in)
1944
98.3 mm (3.9 in)
1945
32.4 mm (1.3 in)
1946
60.9 mm (2.4 in)
1947
34.6 mm (1.4 in)
1948
71.9 mm (2.8 in)
1949
24.0 mm (0.9 in)
1950
5.6 mm (0.22 in)
1951
35.7 mm (1.4 in)
1952
20.3 mm (0.8 in)
1953
92.8 mm (3.7 in)
1954
51.8 mm (2.0 in)
1955
45.6 mm (1.8 in)
1956
49.5 mm (1.9 in)
1957
39.7 mm (1.6 in)
1958
34.1 mm (1.3 in)
1959
41.9 mm (1.6 in)
1960
19.8 mm (0.8 in)
1961
57.2 mm (2.3 in)
1962
83.7 mm (3.3 in)
1963
64.1 mm (2.5 in)
1964
103.9 mm (4.1 in)
1965
78.3 mm (3.1 in)
1966
61.2 mm (2.4 in)
1967
108.0 mm (4.3 in)
1968
32.1 mm (1.3 in)
1969
94.4 mm (3.7 in)
1970
59.7 mm (2.4 in)
1971
35.2 mm (1.4 in)
1972
60.5 mm (2.4 in)
1973
62.5 mm (2.5 in)
1974
82.3 mm (3.2 in)
1975
54.4 mm (2.1 in)
1976
66.9 mm (2.6 in)
1977
27.9 mm (1.1 in)
1978
77.7 mm (3.1 in)
1979
17.3 mm (0.7 in)
1980
26.7 mm (1.1 in)
1981
42.4 mm (1.7 in)
1982
44.6 mm (1.8 in)
1983
39.1 mm (1.5 in)
1984
29.8 mm (1.2 in)
1985
46.8 mm (1.8 in)
1986
77.7 mm (3.1 in)
1987
43.9 mm (1.7 in)
1988
36.3 mm (1.4 in)
1989
48.3 mm (1.9 in)
1990
22.9 mm (0.9 in)
1991
110.5 mm (4.4 in)
Longest dry spell (CDD)
The longest dry spell of the year at Haxby 18 SW, 1922 to 1991. The record is 81 days in 1973, marked on the chart; the median year is 35 days.
Longest dry spell (CDD) at Haxby 18 SW by year
Year
Longest dry spell (CDD)
1922
31 days
1923
26 days
1924
22 days
1925
21 days
1926
34 days
1927
29 days
1928
49 days
1929
32 days
1930
37 days
1931
34 days
1932
26 days
1933
29 days
1934
35 days
1935
44 days
1936
29 days
1937
45 days
1938
38 days
1939
49 days
1940
33 days
1941
37 days
1942
35 days
1943
40 days
1944
31 days
1945
26 days
1946
25 days
1947
29 days
1948
46 days
1949
49 days
1950
21 days
1951
32 days
1952
58 days
1953
36 days
1954
34 days
1955
46 days
1956
74 days
1957
37 days
1958
38 days
1959
36 days
1960
64 days
1961
37 days
1962
29 days
1963
74 days
1964
45 days
1965
70 days
1966
33 days
1967
28 days
1968
27 days
1969
39 days
1970
35 days
1971
47 days
1972
32 days
1973
81 days
1974
31 days
1975
40 days
1976
29 days
1977
31 days
1978
24 days
1979
32 days
1980
54 days
1981
35 days
1982
35 days
1983
38 days
1984
25 days
1985
55 days
1986
29 days
1987
63 days
1988
28 days
1989
22 days
1990
40 days
1991
24 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
60 years with a frost
Across 60 years with a frost, the median last spring frost at Haxby 18 SW falls on 16 May and the median first autumn frost on 20 September, which leaves a median of 127 days between them.
In 1954 to 1990 the median growing season was 120 days. That is 16 days fewer than in 1923 to 1953.
Fitted over all years, the growing season changes by -4.3 days per decade at this station.
Frost dates and growing season at Haxby 18 SW
Measure
Median, all years
Earliest period (1923 to 1953)
Recent period (1954 to 1990)
Recent against earliest
Fitted trend
Last spring frost
16 May
15 May
19 May
4 days later
+2.1 days per decade
First autumn frost
20 September
25 September
17 September
8 days earlier
-2.2 days per decade
Growing days
127 days
136 days
120 days
16 days fewer
-4.3 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
64 years, 1924 to 1990
A day with at least 34.2 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 81.3 mm (3.2 in) of rain is expected about once in 100 years.
Rainfall return levels at Haxby 18 SW: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.2 mm (1.3 in)
5 years
48.4 mm (1.9 in)
10 years
57.1 mm (2.2 in)
25 years
67.4 mm (2.7 in)
50 years
74.5 mm (2.9 in)
100 years
81.3 mm (3.2 in)
Longer than the 64 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, 64 years of values from 1924 to 1990.
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: 78.5 mm (3.1 in) in 1964; 70.1 mm (2.8 in) in 1986; 69.1 mm (2.7 in) in 1948.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Download the Data
Data for Haxby 18 SW standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Haxby 18 SW 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.