Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Palmerston. 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 Palmerston, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
37.8 C (100.0 F)
-1.1 C (30.0 F)
n/a
n/a
Feb
38.0 C (100.4 F)
-1.2 C (29.8 F)
n/a
n/a
Mar
35.0 C (95.0 F)
-3.9 C (25.0 F)
n/a
n/a
Apr
27.5 C (81.5 F)
-5.5 C (22.1 F)
n/a
n/a
May
22.8 C (73.0 F)
-7.3 C (18.9 F)
n/a
n/a
Jun
18.5 C (65.3 F)
-11.9 C (10.6 F)
n/a
n/a
Jul
16.5 C (61.7 F)
-8.0 C (17.6 F)
n/a
n/a
Aug
20.0 C (68.0 F)
-5.6 C (21.9 F)
n/a
n/a
Sep
26.0 C (78.8 F)
-4.4 C (24.1 F)
n/a
n/a
Oct
30.0 C (86.0 F)
-3.9 C (25.0 F)
n/a
n/a
Nov
31.5 C (88.7 F)
-4.5 C (23.9 F)
n/a
n/a
Dec
35.0 C (95.0 F)
-2.2 C (28.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Palmerston still stand. 1968 holds the most, with 73.
Standing records at Palmerston by the year they were set
Year set
Standing records
1965
67
1966
51
1967
44
1968
73
1969
66
1970
49
1971
40
1972
71
1973
37
1974
43
1975
51
1976
59
1977
52
1978
45
1979
39
1980
68
1981
51
1982
56
1983
46
1984
42
1985
43
1986
38
1987
66
1988
55
1989
32
1990
51
1991
54
1992
35
1993
40
Wettest Day of Each Month
Mar: 84.6 mm (3.3 in)
The wettest day on record for each calendar month at Palmerston. The most was 84.6 mm (3.3 in) on 19 March 1975.
Record daily precipitation for each month at Palmerston
Month
Record daily precipitation (mm)
Date
Jan
59.7 mm (2.4 in)
13 January 1973
Feb
73.2 mm (2.9 in)
20 February 1972
Mar
84.6 mm (3.3 in)
19 March 1975
Apr
56.1 mm (2.2 in)
27 April 1973
May
59.9 mm (2.4 in)
3 May 1971
Jun
59.6 mm (2.3 in)
14 June 1988
Jul
55.6 mm (2.2 in)
2 July 1966
Aug
64.8 mm (2.6 in)
3 August 1969
Sep
44.8 mm (1.8 in)
11 September 1988
Oct
51.8 mm (2.0 in)
9 October 1992
Nov
69.4 mm (2.7 in)
20 November 1987
Dec
60.8 mm (2.4 in)
8 December 1982
Period of Record Coverage
1965 to 1993
Complete yearUnder 90 percent of days
29 years of record at Palmerston, 1965 to 1993. 1 years have data for under 90 percent of days and are left out of rankings: 1993.
Cooler than the station meanWarmer than the station mean
One stripe for each of 25 complete years at Palmerston, 1965 to 1992. Blue stripes are years cooler than the station's own mean of 11.3 C (52.3 F); red stripes are warmer. The coolest year was 1965, at 10.6 C (51.1 F), and the warmest was 1988, at 12.6 C (54.7 F). The strongest colour marks a difference of 1.4 C (2.5 F).
Annual mean temperature at Palmerston as warming stripes, 1965 to 1992
Year
Annual mean temperature
Difference from the station mean
1965
10.6 C
-0.69 C
1966
10.9 C
-0.39 C
1967
10.9 C
-0.40 C
1968
10.9 C
-0.40 C
1969
10.9 C
-0.35 C
1970
10.7 C
-0.55 C
1971
11.1 C
-0.17 C
1972
11.0 C
-0.27 C
1976
11.0 C
-0.29 C
1977
11.0 C
-0.25 C
1978
11.5 C
+0.18 C
1979
11.4 C
+0.11 C
1980
11.9 C
+0.64 C
1981
12.3 C
+0.99 C
1982
11.7 C
+0.41 C
1983
11.7 C
+0.45 C
1984
10.9 C
-0.44 C
1985
11.0 C
-0.25 C
1986
10.9 C
-0.39 C
1987
11.2 C
-0.13 C
1988
12.6 C
+1.34 C
1989
11.8 C
+0.49 C
1990
11.6 C
+0.35 C
1991
11.4 C
+0.10 C
1992
11.2 C
-0.09 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
1962 to 1993
Yearly extremes at Palmerston: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.0 C (100.4 F)
1983
33.7 C (92.7 F)
29
Coldest night (TNn)
-11.9 C (10.6 F)
1972
-6.0 C (21.2 F)
29
Wettest day (Rx1day)
84.6 mm (3.3 in)
1975
50.5 mm (2.0 in)
32
Wettest five days (Rx5day)
126.0 mm (5.0 in)
1977
71.7 mm (2.8 in)
32
Longest dry spell (CDD)
41 days
1991
21 days
32
Hottest day (TXx)
The hottest day of the year at Palmerston, 1962 to 1993. The record is 38.0 C (100.4 F) in 1983, marked on the chart; the median year is 33.7 C (92.7 F).
Hottest day (TXx) at Palmerston by year
Year
Hottest day (TXx)
1962
n/a
1963
n/a
1964
n/a
1965
33.9 C (93.0 F)
1966
35.0 C (95.0 F)
1967
35.7 C (96.3 F)
1968
37.8 C (100.0 F)
1969
33.1 C (91.6 F)
1970
31.1 C (88.0 F)
1971
30.6 C (87.1 F)
1972
33.3 C (91.9 F)
1973
36.7 C (98.1 F)
1974
33.7 C (92.7 F)
1975
35.4 C (95.7 F)
1976
33.3 C (91.9 F)
1977
33.6 C (92.5 F)
1978
32.5 C (90.5 F)
1979
35.0 C (95.0 F)
1980
32.5 C (90.5 F)
1981
34.5 C (94.1 F)
1982
36.5 C (97.7 F)
1983
38.0 C (100.4 F)
1984
31.0 C (87.8 F)
1985
32.0 C (89.6 F)
1986
31.5 C (88.7 F)
1987
32.5 C (90.5 F)
1988
35.5 C (95.9 F)
1989
34.0 C (93.2 F)
1990
34.2 C (93.6 F)
1991
35.2 C (95.4 F)
1992
31.7 C (89.1 F)
1993
33.2 C (91.8 F)
Coldest night (TNn)
The coldest night of the year at Palmerston, 1962 to 1993. The record is -11.9 C (10.6 F) in 1972, marked on the chart; the median year is -6.0 C (21.2 F).
Coldest night (TNn) at Palmerston by year
Year
Coldest night (TNn)
1962
n/a
1963
n/a
1964
n/a
1965
-6.3 C (20.7 F)
1966
-7.2 C (19.0 F)
1967
-6.1 C (21.0 F)
1968
-5.6 C (21.9 F)
1969
-6.7 C (19.9 F)
1970
-6.7 C (19.9 F)
1971
-5.0 C (23.0 F)
1972
-11.9 C (10.6 F)
1973
-5.6 C (21.9 F)
1974
-5.5 C (22.1 F)
1975
-6.5 C (20.3 F)
1976
-8.0 C (17.6 F)
1977
-4.5 C (23.9 F)
1978
-5.5 C (22.1 F)
1979
-5.5 C (22.1 F)
1980
-6.0 C (21.2 F)
1981
-6.0 C (21.2 F)
1982
-6.0 C (21.2 F)
1983
-6.0 C (21.2 F)
1984
-6.5 C (20.3 F)
1985
-6.0 C (21.2 F)
1986
-8.0 C (17.6 F)
1987
-6.5 C (20.3 F)
1988
-4.0 C (24.8 F)
1989
-5.0 C (23.0 F)
1990
-6.5 C (20.3 F)
1991
-5.1 C (22.8 F)
1992
-5.4 C (22.3 F)
1993
-5.5 C (22.1 F)
Wettest day (Rx1day)
The wettest day of the year at Palmerston, 1962 to 1993. The record is 84.6 mm (3.3 in) in 1975, marked on the chart; the median year is 50.5 mm (2.0 in).
Wettest day (Rx1day) at Palmerston by year
Year
Wettest day (Rx1day)
1962
25.7 mm (1.0 in)
1963
39.4 mm (1.6 in)
1964
64.8 mm (2.6 in)
1965
56.4 mm (2.2 in)
1966
55.6 mm (2.2 in)
1967
42.7 mm (1.7 in)
1968
57.2 mm (2.3 in)
1969
64.8 mm (2.6 in)
1970
39.1 mm (1.5 in)
1971
59.9 mm (2.4 in)
1972
73.2 mm (2.9 in)
1973
59.7 mm (2.4 in)
1974
57.6 mm (2.3 in)
1975
84.6 mm (3.3 in)
1976
53.6 mm (2.1 in)
1977
49.2 mm (1.9 in)
1978
44.2 mm (1.7 in)
1979
40.4 mm (1.6 in)
1980
41.0 mm (1.6 in)
1981
39.0 mm (1.5 in)
1982
60.8 mm (2.4 in)
1983
35.0 mm (1.4 in)
1984
47.8 mm (1.9 in)
1985
36.0 mm (1.4 in)
1986
40.0 mm (1.6 in)
1987
69.4 mm (2.7 in)
1988
59.6 mm (2.3 in)
1989
68.6 mm (2.7 in)
1990
25.2 mm (1.0 in)
1991
40.0 mm (1.6 in)
1992
51.8 mm (2.0 in)
1993
35.4 mm (1.4 in)
Wettest five days (Rx5day)
The wettest five days of the year at Palmerston, 1962 to 1993. The record is 126.0 mm (5.0 in) in 1977, marked on the chart; the median year is 71.7 mm (2.8 in).
Wettest five days (Rx5day) at Palmerston by year
Year
Wettest five days (Rx5day)
1962
35.1 mm (1.4 in)
1963
45.9 mm (1.8 in)
1964
66.8 mm (2.6 in)
1965
86.1 mm (3.4 in)
1966
101.1 mm (4.0 in)
1967
74.2 mm (2.9 in)
1968
87.6 mm (3.4 in)
1969
122.9 mm (4.8 in)
1970
89.8 mm (3.5 in)
1971
81.6 mm (3.2 in)
1972
113.1 mm (4.5 in)
1973
76.0 mm (3.0 in)
1974
82.2 mm (3.2 in)
1975
119.1 mm (4.7 in)
1976
59.8 mm (2.4 in)
1977
126.0 mm (5.0 in)
1978
52.6 mm (2.1 in)
1979
68.8 mm (2.7 in)
1980
67.4 mm (2.7 in)
1981
52.4 mm (2.1 in)
1982
64.0 mm (2.5 in)
1983
48.4 mm (1.9 in)
1984
86.6 mm (3.4 in)
1985
69.2 mm (2.7 in)
1986
64.0 mm (2.5 in)
1987
96.4 mm (3.8 in)
1988
65.6 mm (2.6 in)
1989
118.2 mm (4.7 in)
1990
48.4 mm (1.9 in)
1991
64.4 mm (2.5 in)
1992
77.4 mm (3.0 in)
1993
44.8 mm (1.8 in)
Longest dry spell (CDD)
The longest dry spell of the year at Palmerston, 1962 to 1993. The record is 41 days in 1991, marked on the chart; the median year is 21 days.
Longest dry spell (CDD) at Palmerston by year
Year
Longest dry spell (CDD)
1962
10 days
1963
36 days
1964
19 days
1965
26 days
1966
17 days
1967
33 days
1968
23 days
1969
15 days
1970
27 days
1971
27 days
1972
37 days
1973
15 days
1974
20 days
1975
23 days
1976
18 days
1977
24 days
1978
15 days
1979
21 days
1980
18 days
1981
21 days
1982
27 days
1983
32 days
1984
21 days
1985
20 days
1986
19 days
1987
31 days
1988
30 days
1989
13 days
1990
23 days
1991
41 days
1992
20 days
1993
18 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 Palmerston falls on 27 November and the median first autumn frost on 28 March, which leaves a median of 120 days between them.
Fitted over all years, the growing season changes by +16.5 days per decade at this station.
Frost dates and growing season at Palmerston
Measure
Median, all years
Earliest period
Recent period (1965 to 1992)
Recent against earliest
Fitted trend
Last spring frost
27 November
n/a
27 November
n/a
-9.7 days per decade
First autumn frost
28 March
n/a
28 March
n/a
+6.7 days per decade
Growing days
120 days
n/a
120 days
n/a
+16.5 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.
Download the Data
Data for Palmerston standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Palmerston 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.