Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Donald. 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 Donald, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
44.4 C (111.9 F)
3.1 C (37.6 F)
n/a
n/a
Feb
42.4 C (108.3 F)
4.9 C (40.8 F)
n/a
n/a
Mar
39.8 C (103.6 F)
3.1 C (37.6 F)
n/a
n/a
Apr
35.1 C (95.2 F)
-0.2 C (31.6 F)
n/a
n/a
May
28.0 C (82.4 F)
-2.6 C (27.3 F)
n/a
n/a
Jun
21.8 C (71.2 F)
-4.4 C (24.1 F)
n/a
n/a
Jul
23.4 C (74.1 F)
-6.5 C (20.3 F)
n/a
n/a
Aug
27.4 C (81.3 F)
-4.5 C (23.9 F)
n/a
n/a
Sep
31.4 C (88.5 F)
-3.3 C (26.1 F)
n/a
n/a
Oct
35.6 C (96.1 F)
-1.1 C (30.0 F)
n/a
n/a
Nov
40.4 C (104.7 F)
1.0 C (33.8 F)
n/a
n/a
Dec
40.8 C (105.4 F)
3.6 C (38.5 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Donald still stand. 1982 holds the most, with 69.
Standing records at Donald by the year they were set
Year set
Standing records
1966
15
1967
51
1968
51
1969
52
1970
57
1971
27
1972
43
1973
37
1974
30
1975
45
1976
28
1977
41
1978
40
1979
25
1980
47
1981
45
1982
69
1983
49
1984
51
1985
40
1986
50
1987
60
1988
47
1989
25
1990
46
1991
43
1992
34
1993
36
1994
63
1995
41
1996
38
1997
37
1998
45
1999
40
2000
16
Wettest Day of Each Month
Jan: 94.0 mm (3.7 in)
The wettest day on record for each calendar month at Donald. The most was 94.0 mm (3.7 in) on 27 January 1993.
Record daily precipitation for each month at Donald
Month
Record daily precipitation (mm)
Date
Jan
94.0 mm (3.7 in)
27 January 1993
Feb
71.1 mm (2.8 in)
6 February 1973
Mar
52.6 mm (2.1 in)
16 March 1996
Apr
40.0 mm (1.6 in)
26 April 2020
May
48.4 mm (1.9 in)
10 May 1989
Jun
36.6 mm (1.4 in)
1 June 2013
Jul
43.4 mm (1.7 in)
18 July 1990
Aug
30.0 mm (1.2 in)
28 August 1969
Sep
46.4 mm (1.8 in)
2 September 1988
Oct
51.0 mm (2.0 in)
8 October 1975
Nov
61.2 mm (2.4 in)
27 November 2010
Dec
63.0 mm (2.5 in)
14 December 2018
Period of Record Coverage
1966 to 2000
Complete yearUnder 90 percent of days
35 years of record at Donald, 1966 to 2000. 2 years have data for under 90 percent of days and are left out of rankings: 1966, 2000.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Donald, 1967 to 1999. Blue stripes are years cooler than the station's own mean of 15.0 C (59.1 F); red stripes are warmer. The coolest year was 1996, at 14.3 C (57.8 F), and the warmest was 1988, at 15.9 C (60.7 F). The strongest colour marks a difference of 0.9 C (1.6 F).
Annual mean temperature at Donald as warming stripes, 1967 to 1999
Year
Annual mean temperature
Difference from the station mean
1967
15.1 C
+0.04 C
1968
15.0 C
-0.01 C
1969
14.7 C
-0.33 C
1970
14.5 C
-0.57 C
1971
14.9 C
-0.12 C
1972
15.2 C
+0.11 C
1973
15.1 C
+0.01 C
1974
14.9 C
-0.15 C
1975
15.3 C
+0.25 C
1976
14.8 C
-0.21 C
1977
14.9 C
-0.15 C
1978
14.9 C
-0.15 C
1980
15.3 C
+0.23 C
1981
15.6 C
+0.51 C
1982
15.6 C
+0.51 C
1983
15.1 C
+0.00 C
1984
14.6 C
-0.50 C
1985
15.1 C
+0.09 C
1986
14.6 C
-0.49 C
1987
14.8 C
-0.23 C
1988
15.9 C
+0.88 C
1989
15.2 C
+0.18 C
1990
15.7 C
+0.65 C
1991
15.2 C
+0.17 C
1992
14.6 C
-0.47 C
1993
15.0 C
-0.04 C
1994
15.2 C
+0.13 C
1995
14.7 C
-0.32 C
1996
14.3 C
-0.72 C
1997
15.3 C
+0.28 C
1998
15.0 C
-0.10 C
1999
15.5 C
+0.49 C
The fitted trend in annual mean temperature here over 1967 to 1999 is 0.05 C (-0.09 to 0.19) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.3) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Donald
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.05 C (-0.09 to 0.19) per decade
0.1 F (-0.2 to 0.3) per decade
1967 to 1999
32
Not clearly different from zero
Mean daily maximum
0.04 C (-0.18 to 0.26) per decade
0.1 F (-0.3 to 0.5) per decade
1967 to 1999
32
Not clearly different from zero
Mean daily minimum
0.1 C (-0.1 to 0.2) per decade
0.1 F (-0.2 to 0.4) per decade
1967 to 1999
32
Not clearly different from zero
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
1966 to 2024
Yearly extremes at Donald: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
44.4 C (111.9 F)
1968
40.6 C (105.1 F)
35
Coldest night (TNn)
-6.5 C (20.3 F)
1982
-1.7 C (28.9 F)
35
Wettest day (Rx1day)
94.0 mm (3.7 in)
1993
34.4 mm (1.4 in)
59
Wettest five days (Rx5day)
187.6 mm (7.4 in)
2011
47.5 mm (1.9 in)
59
Longest dry spell (CDD)
83 days
1997
32 days
59
Hottest day (TXx)
The hottest day of the year at Donald, 1966 to 2024. The record is 44.4 C (111.9 F) in 1968, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at Donald by year
Year
Hottest day (TXx)
1966
38.6 C (101.5 F)
1967
39.6 C (103.3 F)
1968
44.4 C (111.9 F)
1969
41.4 C (106.5 F)
1970
41.7 C (107.1 F)
1971
40.8 C (105.4 F)
1972
40.3 C (104.5 F)
1973
41.1 C (106.0 F)
1974
36.4 C (97.5 F)
1975
40.4 C (104.7 F)
1976
40.8 C (105.4 F)
1977
40.0 C (104.0 F)
1978
39.0 C (102.2 F)
1979
44.3 C (111.7 F)
1980
40.7 C (105.3 F)
1981
41.3 C (106.3 F)
1982
43.1 C (109.6 F)
1983
42.2 C (108.0 F)
1984
35.4 C (95.7 F)
1985
41.9 C (107.4 F)
1986
38.1 C (100.6 F)
1987
39.0 C (102.2 F)
1988
39.0 C (102.2 F)
1989
39.0 C (102.2 F)
1990
41.6 C (106.9 F)
1991
40.6 C (105.1 F)
1992
39.0 C (102.2 F)
1993
39.6 C (103.3 F)
1994
39.7 C (103.5 F)
1995
39.4 C (102.9 F)
1996
40.0 C (104.0 F)
1997
40.6 C (105.1 F)
1998
41.4 C (106.5 F)
1999
41.0 C (105.8 F)
2000
41.5 C (106.7 F)
2001
n/a
2002
n/a
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
n/a
2010
n/a
2011
n/a
2012
n/a
2013
n/a
2014
n/a
2015
n/a
2016
n/a
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
Coldest night (TNn)
The coldest night of the year at Donald, 1966 to 2024. The record is -6.5 C (20.3 F) in 1982, marked on the chart; the median year is -1.7 C (28.9 F).
Coldest night (TNn) at Donald by year
Year
Coldest night (TNn)
1966
2.4 C (36.3 F)
1967
-2.1 C (28.2 F)
1968
-2.4 C (27.7 F)
1969
-2.4 C (27.7 F)
1970
-1.9 C (28.6 F)
1971
-1.3 C (29.7 F)
1972
-3.1 C (26.4 F)
1973
-1.8 C (28.8 F)
1974
-3.0 C (26.6 F)
1975
-1.7 C (28.9 F)
1976
-4.5 C (23.9 F)
1977
-2.3 C (27.9 F)
1978
-1.0 C (30.2 F)
1979
-1.5 C (29.3 F)
1980
0.1 C (32.2 F)
1981
-0.7 C (30.7 F)
1982
-6.5 C (20.3 F)
1983
-1.4 C (29.5 F)
1984
-4.0 C (24.8 F)
1985
-3.0 C (26.6 F)
1986
-1.6 C (29.1 F)
1987
-0.6 C (30.9 F)
1988
0.0 C (32.0 F)
1989
-0.7 C (30.7 F)
1990
-3.3 C (26.1 F)
1991
-1.0 C (30.2 F)
1992
-1.4 C (29.5 F)
1993
-1.0 C (30.2 F)
1994
-4.0 C (24.8 F)
1995
-2.0 C (28.4 F)
1996
-0.3 C (31.5 F)
1997
-4.5 C (23.9 F)
1998
-4.0 C (24.8 F)
1999
-1.4 C (29.5 F)
2000
-1.0 C (30.2 F)
2001
n/a
2002
n/a
2003
n/a
2004
n/a
2005
n/a
2006
n/a
2007
n/a
2008
n/a
2009
n/a
2010
n/a
2011
n/a
2012
n/a
2013
n/a
2014
n/a
2015
n/a
2016
n/a
2017
n/a
2018
n/a
2019
n/a
2020
n/a
2021
n/a
2022
n/a
2023
n/a
2024
n/a
Wettest day (Rx1day)
The wettest day of the year at Donald, 1966 to 2024. The record is 94.0 mm (3.7 in) in 1993, marked on the chart; the median year is 34.4 mm (1.4 in).
Wettest day (Rx1day) at Donald by year
Year
Wettest day (Rx1day)
1966
12.7 mm (0.5 in)
1967
17.8 mm (0.7 in)
1968
27.4 mm (1.1 in)
1969
30.0 mm (1.2 in)
1970
36.1 mm (1.4 in)
1971
42.2 mm (1.7 in)
1972
19.8 mm (0.8 in)
1973
71.1 mm (2.8 in)
1974
60.4 mm (2.4 in)
1975
51.0 mm (2.0 in)
1976
18.0 mm (0.7 in)
1977
16.0 mm (0.6 in)
1978
39.0 mm (1.5 in)
1979
31.0 mm (1.2 in)
1980
38.2 mm (1.5 in)
1981
46.4 mm (1.8 in)
1982
28.0 mm (1.1 in)
1983
45.0 mm (1.8 in)
1984
29.2 mm (1.1 in)
1985
36.2 mm (1.4 in)
1986
26.2 mm (1.0 in)
1987
29.0 mm (1.1 in)
1988
46.4 mm (1.8 in)
1989
48.4 mm (1.9 in)
1990
43.4 mm (1.7 in)
1991
34.0 mm (1.3 in)
1992
26.8 mm (1.1 in)
1993
94.0 mm (3.7 in)
1994
22.0 mm (0.9 in)
1995
36.2 mm (1.4 in)
1996
52.6 mm (2.1 in)
1997
26.0 mm (1.0 in)
1998
36.0 mm (1.4 in)
1999
34.4 mm (1.4 in)
2000
21.2 mm (0.8 in)
2001
21.4 mm (0.8 in)
2002
34.0 mm (1.3 in)
2003
38.0 mm (1.5 in)
2004
43.2 mm (1.7 in)
2005
30.0 mm (1.2 in)
2006
16.4 mm (0.6 in)
2007
47.6 mm (1.9 in)
2008
32.4 mm (1.3 in)
2009
38.2 mm (1.5 in)
2010
61.2 mm (2.4 in)
2011
81.0 mm (3.2 in)
2012
34.4 mm (1.4 in)
2013
36.6 mm (1.4 in)
2014
22.0 mm (0.9 in)
2015
19.0 mm (0.7 in)
2016
34.4 mm (1.4 in)
2017
27.2 mm (1.1 in)
2018
63.0 mm (2.5 in)
2019
26.5 mm (1.0 in)
2020
40.0 mm (1.6 in)
2021
30.6 mm (1.2 in)
2022
34.0 mm (1.3 in)
2023
53.0 mm (2.1 in)
2024
24.0 mm (0.9 in)
Wettest five days (Rx5day)
The wettest five days of the year at Donald, 1966 to 2024. The record is 187.6 mm (7.4 in) in 2011, marked on the chart; the median year is 47.5 mm (1.9 in).
Wettest five days (Rx5day) at Donald by year
Year
Wettest five days (Rx5day)
1966
23.6 mm (0.9 in)
1967
23.2 mm (0.9 in)
1968
41.4 mm (1.6 in)
1969
39.1 mm (1.5 in)
1970
43.4 mm (1.7 in)
1971
57.1 mm (2.2 in)
1972
47.5 mm (1.9 in)
1973
115.6 mm (4.6 in)
1974
87.2 mm (3.4 in)
1975
72.8 mm (2.9 in)
1976
26.2 mm (1.0 in)
1977
28.6 mm (1.1 in)
1978
51.0 mm (2.0 in)
1979
55.0 mm (2.2 in)
1980
54.6 mm (2.1 in)
1981
47.2 mm (1.9 in)
1982
28.0 mm (1.1 in)
1983
68.4 mm (2.7 in)
1984
50.2 mm (2.0 in)
1985
47.0 mm (1.9 in)
1986
42.6 mm (1.7 in)
1987
45.2 mm (1.8 in)
1988
59.6 mm (2.3 in)
1989
56.0 mm (2.2 in)
1990
51.6 mm (2.0 in)
1991
39.4 mm (1.6 in)
1992
58.4 mm (2.3 in)
1993
97.2 mm (3.8 in)
1994
25.0 mm (1.0 in)
1995
94.8 mm (3.7 in)
1996
52.6 mm (2.1 in)
1997
32.6 mm (1.3 in)
1998
42.6 mm (1.7 in)
1999
48.4 mm (1.9 in)
2000
33.4 mm (1.3 in)
2001
28.2 mm (1.1 in)
2002
34.4 mm (1.4 in)
2003
57.8 mm (2.3 in)
2004
51.6 mm (2.0 in)
2005
42.0 mm (1.7 in)
2006
24.4 mm (1.0 in)
2007
52.4 mm (2.1 in)
2008
42.4 mm (1.7 in)
2009
61.4 mm (2.4 in)
2010
83.4 mm (3.3 in)
2011
187.6 mm (7.4 in)
2012
37.4 mm (1.5 in)
2013
46.4 mm (1.8 in)
2014
33.0 mm (1.3 in)
2015
33.0 mm (1.3 in)
2016
60.0 mm (2.4 in)
2017
40.8 mm (1.6 in)
2018
105.3 mm (4.1 in)
2019
30.8 mm (1.2 in)
2020
52.6 mm (2.1 in)
2021
56.6 mm (2.2 in)
2022
64.6 mm (2.5 in)
2023
73.4 mm (2.9 in)
2024
30.4 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Donald, 1966 to 2024. The record is 83 days in 1997, marked on the chart; the median year is 32 days.
Longest dry spell (CDD) at Donald by year
Year
Longest dry spell (CDD)
1966
13 days
1967
54 days
1968
26 days
1969
28 days
1970
67 days
1971
23 days
1972
38 days
1973
18 days
1974
29 days
1975
31 days
1976
36 days
1977
27 days
1978
29 days
1979
22 days
1980
55 days
1981
56 days
1982
41 days
1983
49 days
1984
32 days
1985
67 days
1986
31 days
1987
26 days
1988
33 days
1989
30 days
1990
26 days
1991
43 days
1992
27 days
1993
31 days
1994
31 days
1995
29 days
1996
42 days
1997
83 days
1998
54 days
1999
49 days
2000
41 days
2001
31 days
2002
36 days
2003
46 days
2004
35 days
2005
51 days
2006
42 days
2007
35 days
2008
63 days
2009
50 days
2010
27 days
2011
20 days
2012
29 days
2013
24 days
2014
30 days
2015
32 days
2016
41 days
2017
33 days
2018
29 days
2019
39 days
2020
26 days
2021
29 days
2022
31 days
2023
30 days
2024
66 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
30 years with a frost
Across 30 years with a frost, the median last spring frost at Donald falls on 25 August and the median first autumn frost on 3 June, which leaves a median of 284 days between them.
Fitted over all years, the growing season changes by +3.2 days per decade at this station.
Frost dates and growing season at Donald
Measure
Median, all years
Earliest period
Recent period (1967 to 1999)
Recent against earliest
Fitted trend
Last spring frost
25 August
n/a
25 August
n/a
-3.6 days per decade
First autumn frost
3 June
n/a
3 June
n/a
-0.4 days per decade
Growing days
284 days
n/a
284 days
n/a
+3.2 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
57 years, 1967 to 2023
A day with at least 34.0 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 92.0 mm (3.6 in) of rain is expected about once in 100 years.
Rainfall return levels at Donald: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
34.0 mm (1.3 in)
5 years
47.5 mm (1.9 in)
10 years
57.1 mm (2.2 in)
25 years
70.3 mm (2.8 in)
50 years
80.9 mm (3.2 in)
100 years
92.0 mm (3.6 in)
Longer than the 57 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, 57 years of values from 1967 to 2023.
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: 94.0 mm (3.7 in) in 1993; 81.0 mm (3.2 in) in 2011; 71.1 mm (2.8 in) in 1973.
Download the Data
Data for Donald standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Donald 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.