Record envelope, standing records and threshold days for Letchworth Park (USC00304698), New York, United States, with 41 years of record.
Key Facts for Letchworth Park
Letchworth Park (USC00304698) is a weather station in New York, United States at 42.58 latitude and -78.03 longitude, 384 m (1,260 ft) above sea level.
The station reports from 1912 to 1952, 41 years of record.
1,464 records set at Letchworth Park still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Letchworth Park set a daily record high maximum temperature of 35.0 C (95.0 F) on 22 July 1952.
About the Station
Location: New York, United States, 42.58 latitude, -78.03 longitude.
Elevation: 384 m (1,260 ft).
Period of record: 1912 to 1952, 41 years.
Eligible elements: tmax, tmin, prcp.
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 Letchworth Park. 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 Letchworth Park, with 2026 drawn through them
Month
Highest record high
Lowest record low
2026 highest maximum
2026 lowest minimum
Jan
22.2 C (72.0 F)
-30.0 C (-22.0 F)
n/a
n/a
Feb
18.9 C (66.0 F)
-36.1 C (-33.0 F)
n/a
n/a
Mar
27.8 C (82.0 F)
-25.6 C (-14.1 F)
n/a
n/a
Apr
32.2 C (90.0 F)
-18.9 C (-2.0 F)
n/a
n/a
May
32.8 C (91.0 F)
-6.1 C (21.0 F)
n/a
n/a
Jun
38.3 C (100.9 F)
-1.1 C (30.0 F)
n/a
n/a
Jul
38.3 C (100.9 F)
2.8 C (37.0 F)
n/a
n/a
Aug
37.8 C (100.0 F)
-0.6 C (30.9 F)
n/a
n/a
Sep
36.1 C (97.0 F)
-3.9 C (25.0 F)
n/a
n/a
Oct
33.3 C (91.9 F)
-8.9 C (16.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
21.1 C (70.0 F)
-27.2 C (-17.0 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Letchworth Park still stand. 1934 holds the most, with 62.
Standing records at Letchworth Park by the year they were set
Year set
Standing records
1912
12
1913
37
1914
52
1915
25
1916
48
1917
41
1918
45
1919
37
1920
52
1921
48
1922
22
1923
50
1924
37
1925
37
1926
56
1927
34
1928
50
1929
33
1930
41
1931
32
1932
48
1933
46
1934
62
1935
28
1936
59
1937
29
1938
27
1939
14
1940
35
1941
30
1942
32
1943
11
1944
22
1945
43
1946
33
1947
37
1948
26
1949
32
1950
19
1951
28
1952
14
All-Time Record Progression
1 new records
1 all-time records were set at Letchworth Park between 25 July 1945 and 25 July 1945. Each dot is a new record.
When Letchworth Park set new all-time records
Date
Kind
Detail
1945-07-25
Record high minimum temperature
Record high minimum temperature 24.4 C (75.9 F)
Wettest Day of Each Month
Nov: 81.3 mm (3.2 in)
The wettest day on record for each calendar month at Letchworth Park. The most was 81.3 mm (3.2 in) on 17 November 1927.
Record daily precipitation for each month at Letchworth Park
Month
Record daily precipitation (mm)
Date
Jan
35.6 mm (1.4 in)
30 January 1939
Feb
49.5 mm (1.9 in)
7 February 1942
Mar
53.3 mm (2.1 in)
25 March 1913
Apr
44.5 mm (1.8 in)
18 April 1924
May
77.2 mm (3.0 in)
16 May 1916
Jun
63.5 mm (2.5 in)
18 June 1936
Jul
71.6 mm (2.8 in)
18 July 1942
Aug
64.0 mm (2.5 in)
12 August 1937
Sep
58.4 mm (2.3 in)
13 September 1938
Oct
43.4 mm (1.7 in)
2 October 1945
Nov
81.3 mm (3.2 in)
17 November 1927
Dec
43.4 mm (1.7 in)
12 December 1944
Period of Record Coverage
1912 to 1952
Complete yearUnder 90 percent of days
41 years of record at Letchworth Park, 1912 to 1952. 7 years have data for under 90 percent of days and are left out of rankings: 1912, 1928, 1929, 1937, 1942, 1943, 1952.
Cooler than the station meanWarmer than the station mean
One stripe for each of 32 complete years at Letchworth Park, 1913 to 1951. Blue stripes are years cooler than the station's own mean of 8.4 C (47.2 F); red stripes are warmer. The coolest year was 1917, at 6.2 C (43.2 F), and the warmest was 1949, at 10.2 C (50.3 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Letchworth Park as warming stripes, 1913 to 1951
Year
Annual mean temperature
Difference from the station mean
1913
9.2 C
+0.81 C
1914
7.7 C
-0.78 C
1915
8.1 C
-0.33 C
1916
8.0 C
-0.40 C
1917
6.2 C
-2.21 C
1918
8.4 C
-0.08 C
1920
7.6 C
-0.88 C
1921
9.7 C
+1.25 C
1922
8.4 C
-0.06 C
1923
7.2 C
-1.25 C
1924
6.4 C
-2.07 C
1925
8.3 C
-0.09 C
1927
8.3 C
-0.15 C
1930
8.4 C
-0.07 C
1931
9.2 C
+0.76 C
1932
9.4 C
+0.95 C
1933
9.6 C
+1.20 C
1934
8.6 C
+0.13 C
1935
8.0 C
-0.46 C
1936
8.7 C
+0.28 C
1938
9.0 C
+0.57 C
1939
8.4 C
-0.06 C
1940
6.9 C
-1.56 C
1941
8.7 C
+0.22 C
1944
8.9 C
+0.47 C
1945
8.3 C
-0.13 C
1946
9.4 C
+0.93 C
1947
8.7 C
+0.27 C
1948
8.8 C
+0.33 C
1949
10.2 C
+1.74 C
1950
8.6 C
+0.13 C
1951
9.0 C
+0.55 C
The annual mean temperature here has risen by 0.30 C (0.04 to 0.56) per decade over 1913 to 1951. In Fahrenheit: 0.5 F (0.1 to 1.0) 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 Letchworth Park
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
0.30 C (0.04 to 0.56) per decade
0.5 F (0.1 to 1.0) per decade
1913 to 1951
32
Rise
Mean daily maximum
0.2 C (-0.1 to 0.5) per decade
0.4 F (-0.2 to 1.0) per decade
1913 to 1951
32
Not clearly different from zero
Mean daily minimum
0.4 C (0.1 to 0.6) per decade
0.7 F (0.2 to 1.1) per decade
1913 to 1951
32
Rise
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
1912 to 1952
Yearly extremes at Letchworth Park: the record and the median year
Measure
Record
Year of the record
Median year
Years with a value
Hottest day (TXx)
38.3 C (100.9 F)
1934
33.3 C (91.9 F)
41
Coldest night (TNn)
-36.1 C (-33.0 F)
1934
-23.9 C (-11.0 F)
41
Wettest day (Rx1day)
81.3 mm (3.2 in)
1927
43.2 mm (1.7 in)
41
Wettest five days (Rx5day)
123.0 mm (4.8 in)
1913
65.0 mm (2.6 in)
41
Longest dry spell (CDD)
51 days
1923
18 days
41
Hottest day (TXx)
The hottest day of the year at Letchworth Park, 1912 to 1952. The record is 38.3 C (100.9 F) in 1934, marked on the chart; the median year is 33.3 C (91.9 F).
Hottest day (TXx) at Letchworth Park by year
Year
Hottest day (TXx)
1912
34.4 C (93.9 F)
1913
36.1 C (97.0 F)
1914
35.0 C (95.0 F)
1915
32.2 C (90.0 F)
1916
37.2 C (99.0 F)
1917
31.7 C (89.1 F)
1918
37.2 C (99.0 F)
1919
34.4 C (93.9 F)
1920
31.1 C (88.0 F)
1921
35.6 C (96.1 F)
1922
33.3 C (91.9 F)
1923
32.8 C (91.0 F)
1924
32.8 C (91.0 F)
1925
32.8 C (91.0 F)
1926
31.7 C (89.1 F)
1927
33.9 C (93.0 F)
1928
31.1 C (88.0 F)
1929
33.9 C (93.0 F)
1930
36.1 C (97.0 F)
1931
34.4 C (93.9 F)
1932
36.1 C (97.0 F)
1933
37.8 C (100.0 F)
1934
38.3 C (100.9 F)
1935
33.3 C (91.9 F)
1936
38.3 C (100.9 F)
1937
30.6 C (87.1 F)
1938
31.7 C (89.1 F)
1939
33.3 C (91.9 F)
1940
32.2 C (90.0 F)
1941
34.4 C (93.9 F)
1942
31.1 C (88.0 F)
1943
31.7 C (89.1 F)
1944
34.4 C (93.9 F)
1945
32.8 C (91.0 F)
1946
31.7 C (89.1 F)
1947
33.3 C (91.9 F)
1948
35.0 C (95.0 F)
1949
36.1 C (97.0 F)
1950
32.8 C (91.0 F)
1951
33.3 C (91.9 F)
1952
35.0 C (95.0 F)
Coldest night (TNn)
The coldest night of the year at Letchworth Park, 1912 to 1952. The record is -36.1 C (-33.0 F) in 1934, marked on the chart; the median year is -23.9 C (-11.0 F).
Coldest night (TNn) at Letchworth Park by year
Year
Coldest night (TNn)
1912
-13.3 C (8.1 F)
1913
-20.6 C (-5.1 F)
1914
-30.0 C (-22.0 F)
1915
-20.0 C (-4.0 F)
1916
-25.6 C (-14.1 F)
1917
-26.1 C (-15.0 F)
1918
-27.2 C (-17.0 F)
1919
-27.2 C (-17.0 F)
1920
-27.8 C (-18.0 F)
1921
-24.4 C (-11.9 F)
1922
-26.1 C (-15.0 F)
1923
-25.0 C (-13.0 F)
1924
-26.1 C (-15.0 F)
1925
-24.4 C (-11.9 F)
1926
-22.2 C (-8.0 F)
1927
-27.2 C (-17.0 F)
1928
-23.9 C (-11.0 F)
1929
-22.2 C (-8.0 F)
1930
-21.7 C (-7.1 F)
1931
-20.0 C (-4.0 F)
1932
-16.7 C (1.9 F)
1933
-26.7 C (-16.1 F)
1934
-36.1 C (-33.0 F)
1935
-24.4 C (-11.9 F)
1936
-23.3 C (-9.9 F)
1937
-16.1 C (3.0 F)
1938
-20.0 C (-4.0 F)
1939
-22.8 C (-9.0 F)
1940
-21.7 C (-7.1 F)
1941
-21.1 C (-6.0 F)
1942
-25.0 C (-13.0 F)
1943
-28.3 C (-18.9 F)
1944
-24.4 C (-11.9 F)
1945
-25.6 C (-14.1 F)
1946
-19.4 C (-2.9 F)
1947
-18.9 C (-2.0 F)
1948
-27.2 C (-17.0 F)
1949
-16.1 C (3.0 F)
1950
-21.7 C (-7.1 F)
1951
-20.0 C (-4.0 F)
1952
-19.4 C (-2.9 F)
Wettest day (Rx1day)
The wettest day of the year at Letchworth Park, 1912 to 1952. The record is 81.3 mm (3.2 in) in 1927, marked on the chart; the median year is 43.2 mm (1.7 in).
Wettest day (Rx1day) at Letchworth Park by year
Year
Wettest day (Rx1day)
1912
29.2 mm (1.1 in)
1913
53.3 mm (2.1 in)
1914
29.7 mm (1.2 in)
1915
31.5 mm (1.2 in)
1916
77.2 mm (3.0 in)
1917
41.9 mm (1.6 in)
1918
30.5 mm (1.2 in)
1919
52.8 mm (2.1 in)
1920
64.8 mm (2.6 in)
1921
35.1 mm (1.4 in)
1922
38.1 mm (1.5 in)
1923
53.8 mm (2.1 in)
1924
53.3 mm (2.1 in)
1925
33.5 mm (1.3 in)
1926
43.2 mm (1.7 in)
1927
81.3 mm (3.2 in)
1928
50.8 mm (2.0 in)
1929
25.4 mm (1.0 in)
1930
25.9 mm (1.0 in)
1931
43.4 mm (1.7 in)
1932
39.9 mm (1.6 in)
1933
54.6 mm (2.1 in)
1934
31.8 mm (1.3 in)
1935
33.0 mm (1.3 in)
1936
63.5 mm (2.5 in)
1937
64.0 mm (2.5 in)
1938
67.3 mm (2.6 in)
1939
35.6 mm (1.4 in)
1940
44.5 mm (1.8 in)
1941
43.2 mm (1.7 in)
1942
71.6 mm (2.8 in)
1943
65.5 mm (2.6 in)
1944
43.4 mm (1.7 in)
1945
52.8 mm (2.1 in)
1946
55.4 mm (2.2 in)
1947
33.5 mm (1.3 in)
1948
37.6 mm (1.5 in)
1949
39.4 mm (1.6 in)
1950
53.8 mm (2.1 in)
1951
39.1 mm (1.5 in)
1952
25.1 mm (1.0 in)
Wettest five days (Rx5day)
The wettest five days of the year at Letchworth Park, 1912 to 1952. The record is 123.0 mm (4.8 in) in 1913, marked on the chart; the median year is 65.0 mm (2.6 in).
Wettest five days (Rx5day) at Letchworth Park by year
Year
Wettest five days (Rx5day)
1912
52.6 mm (2.1 in)
1913
123.0 mm (4.8 in)
1914
74.2 mm (2.9 in)
1915
52.2 mm (2.1 in)
1916
104.7 mm (4.1 in)
1917
65.5 mm (2.6 in)
1918
41.1 mm (1.6 in)
1919
107.3 mm (4.2 in)
1920
84.1 mm (3.3 in)
1921
65.0 mm (2.6 in)
1922
52.5 mm (2.1 in)
1923
68.7 mm (2.7 in)
1924
83.3 mm (3.3 in)
1925
44.5 mm (1.8 in)
1926
62.0 mm (2.4 in)
1927
86.4 mm (3.4 in)
1928
50.8 mm (2.0 in)
1929
44.9 mm (1.8 in)
1930
33.5 mm (1.3 in)
1931
62.8 mm (2.5 in)
1932
81.8 mm (3.2 in)
1933
59.9 mm (2.4 in)
1934
40.4 mm (1.6 in)
1935
62.2 mm (2.4 in)
1936
64.8 mm (2.6 in)
1937
71.1 mm (2.8 in)
1938
86.3 mm (3.4 in)
1939
55.6 mm (2.2 in)
1940
65.4 mm (2.6 in)
1941
86.8 mm (3.4 in)
1942
82.8 mm (3.3 in)
1943
68.3 mm (2.7 in)
1944
63.5 mm (2.5 in)
1945
92.5 mm (3.6 in)
1946
80.0 mm (3.1 in)
1947
51.8 mm (2.0 in)
1948
69.8 mm (2.7 in)
1949
43.6 mm (1.7 in)
1950
74.5 mm (2.9 in)
1951
52.3 mm (2.1 in)
1952
31.5 mm (1.2 in)
Longest dry spell (CDD)
The longest dry spell of the year at Letchworth Park, 1912 to 1952. The record is 51 days in 1923, marked on the chart; the median year is 18 days.
Longest dry spell (CDD) at Letchworth Park by year
Year
Longest dry spell (CDD)
1912
9 days
1913
19 days
1914
17 days
1915
20 days
1916
16 days
1917
22 days
1918
24 days
1919
23 days
1920
19 days
1921
23 days
1922
18 days
1923
51 days
1924
45 days
1925
28 days
1926
35 days
1927
23 days
1928
18 days
1929
20 days
1930
14 days
1931
16 days
1932
18 days
1933
21 days
1934
18 days
1935
24 days
1936
20 days
1937
14 days
1938
13 days
1939
18 days
1940
12 days
1941
21 days
1942
19 days
1943
14 days
1944
17 days
1945
10 days
1946
17 days
1947
27 days
1948
17 days
1949
26 days
1950
16 days
1951
14 days
1952
16 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
32 years with a frost
Across 32 years with a frost, the median last spring frost at Letchworth Park falls on 15 May and the median first autumn frost on 30 September, which leaves a median of 137 days between them.
Fitted over all years, the growing season changes by +5.0 days per decade at this station.
Frost dates and growing season at Letchworth Park
Measure
Median, all years
Earliest period
Recent period (1915 to 1951)
Recent against earliest
Fitted trend
Last spring frost
15 May
n/a
16 May
n/a
+1.4 days per decade
First autumn frost
30 September
n/a
30 September
n/a
+6.4 days per decade
Growing days
137 days
n/a
137 days
n/a
+5.0 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
32 years, 1913 to 1951
A day with at least 45.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 93.9 mm (3.7 in) of rain is expected about once in 100 years.
Rainfall return levels at Letchworth Park: the daily rain expected about once in a given number of years
Expected about once in
A day with at least
Note
2 years
45.7 mm (1.8 in)
5 years
58.6 mm (2.3 in)
10 years
67.2 mm (2.6 in)
25 years
78.0 mm (3.1 in)
50 years
86.0 mm (3.4 in)
Longer than the 32 years of record
100 years
93.9 mm (3.7 in)
Longer than the 32 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, 32 years of values from 1913 to 1951.
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: 81.3 mm (3.2 in) in 1927; 77.2 mm (3.0 in) in 1916; 71.6 mm (2.8 in) in 1942.
Download the Data
Data for Letchworth Park standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Letchworth Park 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.