Record highRecord low2026 daily maximum2026 daily minimum
The band shows the record high and record low for each calendar day at Rivers A. 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 Rivers A, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
5.0 C (41.0 F)
-43.9 C (-47.0 F)
n/a
n/a
Feb
7.2 C (45.0 F)
-42.2 C (-44.0 F)
n/a
n/a
Mar
19.4 C (66.9 F)
-42.2 C (-44.0 F)
n/a
n/a
Apr
31.7 C (89.1 F)
-23.3 C (-9.9 F)
n/a
n/a
May
34.4 C (93.9 F)
-9.4 C (15.1 F)
n/a
n/a
Jun
36.1 C (97.0 F)
-1.7 C (28.9 F)
n/a
n/a
Jul
37.2 C (99.0 F)
2.2 C (36.0 F)
n/a
n/a
Aug
36.7 C (98.1 F)
0.0 C (32.0 F)
n/a
n/a
Sep
35.6 C (96.1 F)
-7.8 C (18.0 F)
n/a
n/a
Oct
29.4 C (84.9 F)
-16.7 C (1.9 F)
n/a
n/a
Nov
18.9 C (66.0 F)
-32.8 C (-27.0 F)
n/a
n/a
Dec
12.2 C (54.0 F)
-40.0 C (-40.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Rivers A still stand. 1939 holds the most, with 80.
Standing records at Rivers A by the year they were set
Year set
Standing records
1938
20
1939
80
1940
46
1941
44
1942
65
1943
53
1944
36
1945
62
1946
50
1947
42
1948
46
1949
40
1950
56
1951
56
1952
54
1953
44
1954
47
1955
42
1956
39
1957
36
1958
53
1959
40
1960
24
1961
36
1962
44
1963
47
1964
50
1965
26
1966
46
1967
31
1968
48
1969
38
1970
23
All-Time Record Progression
1 new records
1 all-time records were set at Rivers A between 26 February 1969 and 26 February 1969. Each dot is a new record.
When Rivers A set new all-time records
Date
Kind
Detail
1969-02-26
Record daily snowfall
Record daily snowfall 65.0 cm (25.6 in)
Wettest Day of Each Month
Aug: 139.4 mm (5.5 in)
The wettest day on record for each calendar month at Rivers A. The most was 139.4 mm (5.5 in) on 30 August 1952.
Record daily precipitation for each month at Rivers A
Month
Record daily precipitation (mm)
Date
Jan
17.8 mm (0.7 in)
14 January 1948
Feb
19.3 mm (0.8 in)
18 February 1939
Mar
18.5 mm (0.7 in)
27 March 1956
Apr
44.5 mm (1.8 in)
25 April 1961
May
75.2 mm (3.0 in)
25 May 1960
Jun
89.9 mm (3.5 in)
9 June 1942
Jul
112.0 mm (4.4 in)
20 July 1965
Aug
139.4 mm (5.5 in)
30 August 1952
Sep
60.7 mm (2.4 in)
6 September 1945
Oct
40.6 mm (1.6 in)
7 October 1959
Nov
36.8 mm (1.4 in)
1 November 1938
Dec
25.4 mm (1.0 in)
25 December 1938
Period of Record Coverage
1938 to 1970
Complete yearUnder 90 percent of days
33 years of record at Rivers A, 1938 to 1970. 2 years have data for under 90 percent of days and are left out of rankings: 1938, 1970.
Cooler than the station meanWarmer than the station mean
One stripe for each of 31 complete years at Rivers A, 1939 to 1969. Blue stripes are years cooler than the station's own mean of 1.8 C (35.2 F); red stripes are warmer. The coolest year was 1950, at -0.8 C (30.6 F), and the warmest was 1953, at 3.2 C (37.7 F). The strongest colour marks a difference of 2.6 C (4.7 F).
Annual mean temperature at Rivers A as warming stripes, 1939 to 1969
Year
Annual mean temperature
Difference from the station mean
1939
2.2 C
+0.44 C
1940
2.4 C
+0.64 C
1941
2.5 C
+0.73 C
1942
2.2 C
+0.40 C
1943
1.8 C
-0.01 C
1944
2.9 C
+1.11 C
1945
1.0 C
-0.74 C
1946
1.6 C
-0.17 C
1947
1.5 C
-0.30 C
1948
1.7 C
-0.08 C
1949
1.8 C
+0.01 C
1950
-0.8 C
-2.58 C
1951
0.0 C
-1.81 C
1952
2.9 C
+1.15 C
1953
3.2 C
+1.38 C
1954
2.2 C
+0.45 C
1955
1.2 C
-0.60 C
1956
1.3 C
-0.47 C
1957
2.2 C
+0.38 C
1958
2.8 C
+0.98 C
1959
1.9 C
+0.14 C
1960
2.2 C
+0.37 C
1961
2.5 C
+0.68 C
1962
1.8 C
-0.01 C
1963
2.7 C
+0.91 C
1964
1.6 C
-0.21 C
1965
0.6 C
-1.20 C
1966
0.6 C
-1.15 C
1967
1.4 C
-0.37 C
1968
1.9 C
+0.14 C
1969
1.5 C
-0.24 C
The fitted trend in annual mean temperature here over 1939 to 1969 is -0.1 C (-0.5 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.3 F (-0.9 to 0.4) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Rivers A
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.1 C (-0.5 to 0.2) per decade
-0.3 F (-0.9 to 0.4) per decade
1939 to 1969
31
Not clearly different from zero
Mean daily maximum
-0.2 C (-0.6 to 0.2) per decade
-0.4 F (-1.1 to 0.4) per decade
1939 to 1969
31
Not clearly different from zero
Mean daily minimum
-0.1 C (-0.4 to 0.3) per decade
-0.1 F (-0.8 to 0.5) per decade
1939 to 1969
31
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
1938 to 1970
Yearly extremes at Rivers A: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
37.2 C (99.0 F)
1951
34.4 C (93.9 F)
33
Coldest night (TNn)
-43.9 C (-47.0 F)
1943
-37.8 C (-36.0 F)
33
Wettest day (Rx1day)
139.4 mm (5.5 in)
1952
42.2 mm (1.7 in)
33
Wettest five days (Rx5day)
157.2 mm (6.2 in)
1952
72.4 mm (2.9 in)
33
Longest dry spell (CDD)
41 days
1949
28 days
33
Hottest day (TXx)
The hottest day of the year at Rivers A, 1938 to 1970. The record is 37.2 C (99.0 F) in 1951, marked on the chart; the median year is 34.4 C (93.9 F).
Hottest day (TXx) at Rivers A by year
Year
Hottest day (TXx)
1938
34.4 C (93.9 F)
1939
36.7 C (98.1 F)
1940
35.6 C (96.1 F)
1941
36.7 C (98.1 F)
1942
34.4 C (93.9 F)
1943
33.3 C (91.9 F)
1944
33.9 C (93.0 F)
1945
36.7 C (98.1 F)
1946
36.1 C (97.0 F)
1947
34.4 C (93.9 F)
1948
35.6 C (96.1 F)
1949
35.6 C (96.1 F)
1950
32.2 C (90.0 F)
1951
37.2 C (99.0 F)
1952
36.7 C (98.1 F)
1953
32.8 C (91.0 F)
1954
31.1 C (88.0 F)
1955
35.0 C (95.0 F)
1956
32.8 C (91.0 F)
1957
34.4 C (93.9 F)
1958
34.4 C (93.9 F)
1959
35.0 C (95.0 F)
1960
33.3 C (91.9 F)
1961
36.7 C (98.1 F)
1962
33.3 C (91.9 F)
1963
35.0 C (95.0 F)
1964
32.2 C (90.0 F)
1965
33.9 C (93.0 F)
1966
35.0 C (95.0 F)
1967
34.4 C (93.9 F)
1968
32.8 C (91.0 F)
1969
34.4 C (93.9 F)
1970
34.4 C (93.9 F)
Coldest night (TNn)
The coldest night of the year at Rivers A, 1938 to 1970. The record is -43.9 C (-47.0 F) in 1943, marked on the chart; the median year is -37.8 C (-36.0 F).
Coldest night (TNn) at Rivers A by year
Year
Coldest night (TNn)
1938
-39.4 C (-38.9 F)
1939
-42.2 C (-44.0 F)
1940
-36.7 C (-34.1 F)
1941
-41.1 C (-42.0 F)
1942
-35.6 C (-32.1 F)
1943
-43.9 C (-47.0 F)
1944
-35.0 C (-31.0 F)
1945
-37.8 C (-36.0 F)
1946
-37.2 C (-35.0 F)
1947
-37.8 C (-36.0 F)
1948
-40.0 C (-40.0 F)
1949
-42.2 C (-44.0 F)
1950
-43.3 C (-45.9 F)
1951
-41.1 C (-42.0 F)
1952
-35.0 C (-31.0 F)
1953
-37.8 C (-36.0 F)
1954
-39.4 C (-38.9 F)
1955
-36.1 C (-33.0 F)
1956
-35.6 C (-32.1 F)
1957
-36.1 C (-33.0 F)
1958
-35.0 C (-31.0 F)
1959
-37.2 C (-35.0 F)
1960
-36.1 C (-33.0 F)
1961
-38.9 C (-38.0 F)
1962
-42.2 C (-44.0 F)
1963
-36.1 C (-33.0 F)
1964
-35.0 C (-31.0 F)
1965
-36.1 C (-33.0 F)
1966
-41.1 C (-42.0 F)
1967
-38.3 C (-36.9 F)
1968
-40.0 C (-40.0 F)
1969
-37.2 C (-35.0 F)
1970
-38.9 C (-38.0 F)
Wettest day (Rx1day)
The wettest day of the year at Rivers A, 1938 to 1970. The record is 139.4 mm (5.5 in) in 1952, marked on the chart; the median year is 42.2 mm (1.7 in).
Wettest day (Rx1day) at Rivers A by year
Year
Wettest day (Rx1day)
1938
36.8 mm (1.4 in)
1939
29.0 mm (1.1 in)
1940
27.4 mm (1.1 in)
1941
61.7 mm (2.4 in)
1942
89.9 mm (3.5 in)
1943
39.1 mm (1.5 in)
1944
35.8 mm (1.4 in)
1945
60.7 mm (2.4 in)
1946
42.2 mm (1.7 in)
1947
57.2 mm (2.3 in)
1948
60.2 mm (2.4 in)
1949
85.1 mm (3.4 in)
1950
31.8 mm (1.3 in)
1951
30.7 mm (1.2 in)
1952
139.4 mm (5.5 in)
1953
65.3 mm (2.6 in)
1954
44.5 mm (1.8 in)
1955
37.3 mm (1.5 in)
1956
68.3 mm (2.7 in)
1957
20.3 mm (0.8 in)
1958
23.9 mm (0.9 in)
1959
40.6 mm (1.6 in)
1960
75.2 mm (3.0 in)
1961
47.0 mm (1.9 in)
1962
53.1 mm (2.1 in)
1963
41.1 mm (1.6 in)
1964
24.9 mm (1.0 in)
1965
112.0 mm (4.4 in)
1966
34.3 mm (1.4 in)
1967
25.9 mm (1.0 in)
1968
42.2 mm (1.7 in)
1969
32.0 mm (1.3 in)
1970
46.0 mm (1.8 in)
Wettest five days (Rx5day)
The wettest five days of the year at Rivers A, 1938 to 1970. The record is 157.2 mm (6.2 in) in 1952, marked on the chart; the median year is 72.4 mm (2.9 in).
Wettest five days (Rx5day) at Rivers A by year
Year
Wettest five days (Rx5day)
1938
40.4 mm (1.6 in)
1939
45.2 mm (1.8 in)
1940
36.3 mm (1.4 in)
1941
72.4 mm (2.9 in)
1942
89.9 mm (3.5 in)
1943
57.6 mm (2.3 in)
1944
76.4 mm (3.0 in)
1945
73.5 mm (2.9 in)
1946
50.1 mm (2.0 in)
1947
108.2 mm (4.3 in)
1948
76.4 mm (3.0 in)
1949
117.6 mm (4.6 in)
1950
45.4 mm (1.8 in)
1951
37.1 mm (1.5 in)
1952
157.2 mm (6.2 in)
1953
76.7 mm (3.0 in)
1954
72.4 mm (2.9 in)
1955
49.0 mm (1.9 in)
1956
116.6 mm (4.6 in)
1957
28.9 mm (1.1 in)
1958
36.1 mm (1.4 in)
1959
69.8 mm (2.7 in)
1960
87.9 mm (3.5 in)
1961
74.0 mm (2.9 in)
1962
72.0 mm (2.8 in)
1963
69.2 mm (2.7 in)
1964
46.7 mm (1.8 in)
1965
135.9 mm (5.4 in)
1966
84.8 mm (3.3 in)
1967
39.2 mm (1.5 in)
1968
84.3 mm (3.3 in)
1969
88.3 mm (3.5 in)
1970
73.6 mm (2.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Rivers A, 1938 to 1970. The record is 41 days in 1949, marked on the chart; the median year is 28 days.
Longest dry spell (CDD) at Rivers A by year
Year
Longest dry spell (CDD)
1938
36 days
1939
28 days
1940
31 days
1941
25 days
1942
27 days
1943
37 days
1944
32 days
1945
27 days
1946
33 days
1947
29 days
1948
27 days
1949
41 days
1950
20 days
1951
41 days
1952
24 days
1953
25 days
1954
28 days
1955
26 days
1956
25 days
1957
19 days
1958
34 days
1959
26 days
1960
21 days
1961
37 days
1962
25 days
1963
30 days
1964
31 days
1965
31 days
1966
26 days
1967
35 days
1968
31 days
1969
24 days
1970
21 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
31 years with a frost
Across 31 years with a frost, the median last spring frost at Rivers A falls on 24 May and the median first autumn frost on 16 September, which leaves a median of 114 days between them.
Fitted over all years, the growing season changes by +0.4 days per decade at this station.
Frost dates and growing season at Rivers A
Measure
Median, all years
Earliest period
Recent period (1940 to 1969)
Recent against earliest
Fitted trend
Last spring frost
24 May
n/a
24 May
n/a
+0.4 days per decade
First autumn frost
16 September
n/a
16 September
n/a
+0.8 days per decade
Growing days
114 days
n/a
114 days
n/a
+0.4 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
31 years, 1939 to 1969
A day with at least 43.3 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 165.1 mm (6.5 in) of rain is expected about once in 100 years.
Rainfall return levels at Rivers A: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
43.3 mm (1.7 in)
5 years
65.6 mm (2.6 in)
10 years
83.8 mm (3.3 in)
25 years
111.5 mm (4.4 in)
50 years
136.3 mm (5.4 in)
Longer than the 31 years of record
100 years
165.1 mm (6.5 in)
Longer than the 31 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, 31 years of values from 1939 to 1969.
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: 139.4 mm (5.5 in) in 1952; 112.0 mm (4.4 in) in 1965; 89.9 mm (3.5 in) in 1942.
Download the Data
Data for Rivers A standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rivers A 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.