Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Altona. 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 Altona, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
6.7 C (44.1 F)
-40.0 C (-40.0 F)
n/a
n/a
Feb
10.0 C (50.0 F)
-40.6 C (-41.1 F)
n/a
n/a
Mar
22.2 C (72.0 F)
-33.5 C (-28.3 F)
n/a
n/a
Apr
35.6 C (96.1 F)
-23.9 C (-11.0 F)
n/a
n/a
May
36.7 C (98.1 F)
-13.9 C (7.0 F)
n/a
n/a
Jun
35.6 C (96.1 F)
-2.8 C (27.0 F)
n/a
n/a
Jul
38.9 C (102.0 F)
2.8 C (37.0 F)
n/a
n/a
Aug
38.9 C (102.0 F)
0.0 C (32.0 F)
n/a
n/a
Sep
39.0 C (102.2 F)
-6.7 C (19.9 F)
n/a
n/a
Oct
28.9 C (84.0 F)
-13.9 C (7.0 F)
n/a
n/a
Nov
25.0 C (77.0 F)
-29.4 C (-20.9 F)
n/a
n/a
Dec
14.4 C (57.9 F)
-37.2 C (-35.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Altona still stand. 1950 holds the most, with 62.
Standing records at Altona by the year they were set
Year set
Standing records
1949
48
1950
62
1951
60
1952
57
1953
36
1954
19
1955
32
1956
22
1957
15
1958
38
1959
28
1960
13
1961
27
1962
35
1963
55
1964
61
1965
38
1966
59
1967
51
1968
46
1969
32
1970
36
1971
20
1972
61
1973
52
1974
34
1975
40
1976
56
1977
57
1978
28
1979
58
1980
44
1981
60
1982
33
1983
51
All-Time Record Progression
1 new records
1 all-time records were set at Altona between 2 September 1983 and 2 September 1983. Each dot is a new record.
When Altona set new all-time records
Date
Kind
Detail
1983-09-02
Record high maximum temperature
Record high maximum temperature 39.0 C (102.2 F)
Wettest Day of Each Month
Jun: 116.1 mm (4.6 in)
The wettest day on record for each calendar month at Altona. The most was 116.1 mm (4.6 in) on 10 June 1970.
Record daily precipitation for each month at Altona
Month
Record daily precipitation (mm)
Date
Jan
22.9 mm (0.9 in)
15 January 1949
Feb
19.6 mm (0.8 in)
23 February 1949
Mar
22.9 mm (0.9 in)
4 March 1966
Apr
33.5 mm (1.3 in)
17 April 1979
May
40.4 mm (1.6 in)
21 May 1973
Jun
116.1 mm (4.6 in)
10 June 1970
Jul
101.3 mm (4.0 in)
11 July 1957
Aug
54.6 mm (2.1 in)
17 August 1954
Sep
77.2 mm (3.0 in)
2 September 1957
Oct
57.7 mm (2.3 in)
10 October 1949
Nov
16.3 mm (0.6 in)
2 November 1948
Dec
22.9 mm (0.9 in)
22 December 1974
Period of Record Coverage
1949 to 1983
Complete yearUnder 90 percent of days
35 years of record at Altona, 1949 to 1983. 11 years have data for under 90 percent of days and are left out of rankings: 1949, 1953, 1954, 1955, 1956, 1957, 1958, 1959 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 21 complete years at Altona, 1950 to 1982. Blue stripes are years cooler than the station's own mean of 2.7 C (36.9 F); red stripes are warmer. The coolest year was 1950, at 0.7 C (33.2 F), and the warmest was 1981, at 5.1 C (41.2 F). The strongest colour marks a difference of 2.5 C (4.5 F).
Annual mean temperature at Altona as warming stripes, 1950 to 1982
Year
Annual mean temperature
Difference from the station mean
1950
0.7 C
-2.08 C
1951
1.7 C
-1.01 C
1963
4.0 C
+1.30 C
1964
2.9 C
+0.15 C
1966
1.5 C
-1.23 C
1967
2.3 C
-0.40 C
1968
2.8 C
+0.11 C
1969
2.5 C
-0.21 C
1970
2.1 C
-0.65 C
1971
2.7 C
-0.06 C
1972
1.9 C
-0.84 C
1973
4.1 C
+1.35 C
1974
2.4 C
-0.30 C
1975
3.2 C
+0.46 C
1976
3.2 C
+0.50 C
1977
4.2 C
+1.42 C
1978
2.6 C
-0.11 C
1979
1.3 C
-1.40 C
1980
3.6 C
+0.89 C
1981
5.1 C
+2.40 C
1982
2.4 C
-0.31 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
1948 to 1983
Yearly extremes at Altona: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
39.0 C (102.2 F)
1983
35.6 C (96.1 F)
35
Coldest night (TNn)
-40.6 C (-41.1 F)
1966
-33.9 C (-29.0 F)
35
Wettest day (Rx1day)
116.1 mm (4.6 in)
1970
37.4 mm (1.5 in)
36
Wettest five days (Rx5day)
139.2 mm (5.5 in)
1970
58.7 mm (2.3 in)
36
Longest dry spell (CDD)
55 days
1976
23 days
36
Hottest day (TXx)
The hottest day of the year at Altona, 1948 to 1983. The record is 39.0 C (102.2 F) in 1983, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Altona by year
Year
Hottest day (TXx)
1948
n/a
1949
38.9 C (102.0 F)
1950
34.4 C (93.9 F)
1951
37.8 C (100.0 F)
1952
37.2 C (99.0 F)
1953
35.6 C (96.1 F)
1954
35.0 C (95.0 F)
1955
36.1 C (97.0 F)
1956
33.9 C (93.0 F)
1957
33.3 C (91.9 F)
1958
35.0 C (95.0 F)
1959
36.1 C (97.0 F)
1960
35.0 C (95.0 F)
1961
36.7 C (98.1 F)
1962
32.8 C (91.0 F)
1963
33.9 C (93.0 F)
1964
37.2 C (99.0 F)
1965
36.7 C (98.1 F)
1966
33.3 C (91.9 F)
1967
36.1 C (97.0 F)
1968
33.9 C (93.0 F)
1969
35.6 C (96.1 F)
1970
35.6 C (96.1 F)
1971
34.4 C (93.9 F)
1972
37.2 C (99.0 F)
1973
34.4 C (93.9 F)
1974
35.0 C (95.0 F)
1975
38.9 C (102.0 F)
1976
36.7 C (98.1 F)
1977
33.9 C (93.0 F)
1978
38.9 C (102.0 F)
1979
35.0 C (95.0 F)
1980
36.0 C (96.8 F)
1981
36.5 C (97.7 F)
1982
34.0 C (93.2 F)
1983
39.0 C (102.2 F)
Coldest night (TNn)
The coldest night of the year at Altona, 1948 to 1983. The record is -40.6 C (-41.1 F) in 1966, marked on the chart; the median year is -33.9 C (-29.0 F).
Coldest night (TNn) at Altona by year
Year
Coldest night (TNn)
1948
n/a
1949
-31.1 C (-24.0 F)
1950
-37.2 C (-35.0 F)
1951
-37.2 C (-35.0 F)
1952
-33.9 C (-29.0 F)
1953
-7.8 C (18.0 F)
1954
-20.0 C (-4.0 F)
1955
-8.3 C (17.1 F)
1956
-12.8 C (9.0 F)
1957
-20.0 C (-4.0 F)
1958
-13.9 C (7.0 F)
1959
-11.1 C (12.0 F)
1960
-11.1 C (12.0 F)
1961
-9.4 C (15.1 F)
1962
-28.3 C (-18.9 F)
1963
-35.6 C (-32.1 F)
1964
-33.9 C (-29.0 F)
1965
-34.4 C (-29.9 F)
1966
-40.6 C (-41.1 F)
1967
-37.2 C (-35.0 F)
1968
-38.3 C (-36.9 F)
1969
-33.3 C (-27.9 F)
1970
-37.2 C (-35.0 F)
1971
-36.1 C (-33.0 F)
1972
-36.7 C (-34.1 F)
1973
-32.8 C (-27.0 F)
1974
-35.0 C (-31.0 F)
1975
-31.7 C (-25.1 F)
1976
-33.3 C (-27.9 F)
1977
-36.1 C (-33.0 F)
1978
-34.4 C (-29.9 F)
1979
-36.7 C (-34.1 F)
1980
-34.5 C (-30.1 F)
1981
-32.0 C (-25.6 F)
1982
-35.0 C (-31.0 F)
1983
-35.0 C (-31.0 F)
Wettest day (Rx1day)
The wettest day of the year at Altona, 1948 to 1983. The record is 116.1 mm (4.6 in) in 1970, marked on the chart; the median year is 37.4 mm (1.5 in).
Wettest day (Rx1day) at Altona by year
Year
Wettest day (Rx1day)
1948
19.1 mm (0.8 in)
1949
57.7 mm (2.3 in)
1950
33.8 mm (1.3 in)
1951
25.7 mm (1.0 in)
1952
36.3 mm (1.4 in)
1953
46.7 mm (1.8 in)
1954
54.6 mm (2.1 in)
1955
36.8 mm (1.4 in)
1956
32.3 mm (1.3 in)
1957
101.3 mm (4.0 in)
1958
41.4 mm (1.6 in)
1959
37.8 mm (1.5 in)
1960
23.1 mm (0.9 in)
1961
23.1 mm (0.9 in)
1962
30.5 mm (1.2 in)
1963
96.5 mm (3.8 in)
1964
48.5 mm (1.9 in)
1965
35.6 mm (1.4 in)
1966
79.5 mm (3.1 in)
1967
27.2 mm (1.1 in)
1968
58.4 mm (2.3 in)
1969
30.7 mm (1.2 in)
1970
116.1 mm (4.6 in)
1971
20.3 mm (0.8 in)
1972
28.2 mm (1.1 in)
1973
52.3 mm (2.1 in)
1974
31.8 mm (1.3 in)
1975
33.0 mm (1.3 in)
1976
64.8 mm (2.6 in)
1977
42.2 mm (1.7 in)
1978
61.2 mm (2.4 in)
1979
50.3 mm (2.0 in)
1980
49.4 mm (1.9 in)
1981
37.0 mm (1.5 in)
1982
50.0 mm (2.0 in)
1983
25.0 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Altona, 1948 to 1983. The record is 139.2 mm (5.5 in) in 1970, marked on the chart; the median year is 58.7 mm (2.3 in).
Wettest five days (Rx5day) at Altona by year
Year
Wettest five days (Rx5day)
1948
30.3 mm (1.2 in)
1949
82.6 mm (3.3 in)
1950
65.3 mm (2.6 in)
1951
51.6 mm (2.0 in)
1952
46.8 mm (1.8 in)
1953
56.6 mm (2.2 in)
1954
58.9 mm (2.3 in)
1955
52.8 mm (2.1 in)
1956
52.9 mm (2.1 in)
1957
103.3 mm (4.1 in)
1958
87.6 mm (3.4 in)
1959
60.2 mm (2.4 in)
1960
54.9 mm (2.2 in)
1961
48.9 mm (1.9 in)
1962
55.7 mm (2.2 in)
1963
96.5 mm (3.8 in)
1964
66.0 mm (2.6 in)
1965
53.9 mm (2.1 in)
1966
100.1 mm (3.9 in)
1967
55.2 mm (2.2 in)
1968
58.4 mm (2.3 in)
1969
40.9 mm (1.6 in)
1970
139.2 mm (5.5 in)
1971
31.7 mm (1.2 in)
1972
34.5 mm (1.4 in)
1973
81.5 mm (3.2 in)
1974
56.7 mm (2.2 in)
1975
58.5 mm (2.3 in)
1976
71.5 mm (2.8 in)
1977
60.9 mm (2.4 in)
1978
101.6 mm (4.0 in)
1979
60.0 mm (2.4 in)
1980
71.2 mm (2.8 in)
1981
67.0 mm (2.6 in)
1982
75.4 mm (3.0 in)
1983
41.0 mm (1.6 in)
Longest dry spell (CDD)
The longest dry spell of the year at Altona, 1948 to 1983. The record is 55 days in 1976, marked on the chart; the median year is 23 days.
Longest dry spell (CDD) at Altona by year
Year
Longest dry spell (CDD)
1948
11 days
1949
30 days
1950
26 days
1951
20 days
1952
35 days
1953
20 days
1954
22 days
1955
16 days
1956
26 days
1957
18 days
1958
26 days
1959
15 days
1960
21 days
1961
35 days
1962
21 days
1963
28 days
1964
37 days
1965
23 days
1966
27 days
1967
28 days
1968
21 days
1969
29 days
1970
17 days
1971
22 days
1972
19 days
1973
33 days
1974
18 days
1975
23 days
1976
55 days
1977
27 days
1978
23 days
1979
15 days
1980
49 days
1981
26 days
1982
13 days
1983
14 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
21 years with a frost
Across 21 years with a frost, the median last spring frost at Altona falls on 14 May and the median first autumn frost on 24 September, which leaves a median of 130 days between them.
Frost dates and growing season at Altona
Measure
Median, all years
Earliest period
Recent period (1950 to 1982)
Recent against earliest
Fitted trend
Last spring frost
14 May
n/a
14 May
n/a
n/a
First autumn frost
24 September
n/a
24 September
n/a
n/a
Growing days
130 days
n/a
130 days
n/a
n/a
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 Altona standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Altona 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.