Norwalk Weather Records (USC00065892)
Record envelope, standing records and threshold days for Norwalk (USC00065892), Connecticut, United States, with 64 years of record.
Key Facts for Norwalk
- Norwalk (USC00065892) is a weather station in Connecticut, United States at 41.13 latitude and -73.45 longitude, 37 m (121 ft) above sea level.
- The station reports from 1893 to 1956, 64 years of record.
- 1,464 records set at Norwalk still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Norwalk tied a daily record snowfall of 5.1 cm (2.0 in) on 8 April 1956.
About the Station
- Location: Connecticut, United States, 41.13 latitude, -73.45 longitude.
- Elevation: 37 m (121 ft).
- Period of record: 1893 to 1956, 64 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 21.1 C (70.0 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Feb | 21.1 C (70.0 F) | -28.9 C (-20.0 F) | n/a | n/a |
| Mar | 30.6 C (87.1 F) | -21.1 C (-6.0 F) | n/a | n/a |
| Apr | 33.3 C (91.9 F) | -12.8 C (9.0 F) | n/a | n/a |
| May | 35.6 C (96.1 F) | -4.4 C (24.1 F) | n/a | n/a |
| Jun | 37.8 C (100.0 F) | 0.6 C (33.1 F) | n/a | n/a |
| Jul | 38.9 C (102.0 F) | 5.6 C (42.1 F) | n/a | n/a |
| Aug | 40.0 C (104.0 F) | 1.1 C (34.0 F) | n/a | n/a |
| Sep | 38.9 C (102.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Oct | 32.2 C (90.0 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 | 21.7 C (71.1 F) | -26.7 C (-16.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1893 | 27 |
| 1894 | 23 |
| 1895 | 43 |
| 1896 | 43 |
| 1897 | 19 |
| 1898 | 25 |
| 1899 | 35 |
| 1900 | 23 |
| 1901 | 29 |
| 1902 | 16 |
| 1903 | 30 |
| 1904 | 29 |
| 1905 | 16 |
| 1906 | 17 |
| 1907 | 24 |
| 1908 | 17 |
| 1909 | 22 |
| 1910 | 18 |
| 1911 | 22 |
| 1912 | 16 |
| 1913 | 23 |
| 1914 | 29 |
| 1915 | 21 |
| 1916 | 26 |
| 1917 | 28 |
| 1918 | 23 |
| 1919 | 23 |
| 1920 | 9 |
| 1921 | 19 |
| 1922 | 10 |
| 1923 | 25 |
| 1924 | 15 |
| 1925 | 26 |
| 1926 | 26 |
| 1927 | 13 |
| 1928 | 16 |
| 1929 | 26 |
| 1930 | 26 |
| 1931 | 28 |
| 1932 | 19 |
| 1933 | 30 |
| 1934 | 28 |
| 1935 | 23 |
| 1936 | 20 |
| 1937 | 13 |
| 1938 | 30 |
| 1939 | 18 |
| 1940 | 30 |
| 1941 | 20 |
| 1942 | 23 |
| 1943 | 25 |
| 1944 | 20 |
| 1945 | 31 |
| 1946 | 16 |
| 1947 | 23 |
| 1948 | 26 |
| 1949 | 34 |
| 1950 | 29 |
| 1951 | 19 |
| 1952 | 16 |
| 1953 | 22 |
| 1954 | 23 |
| 1955 | 15 |
| 1956 | 5 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 1930-07-21 | Record high maximum temperature | Record high maximum temperature 38.3 C (100.9 F) |
| 1944-08-11 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
| 1948-08-26 | Record high maximum temperature | Record high maximum temperature 40.0 C (104.0 F) |
| 1955-10-16 | Record daily precipitation | Record daily precipitation 208.3 mm (8.2 in) |
Wettest Day of Each Month
Oct: 208.3 mm (8.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 61.5 mm (2.4 in) | 7 January 1910 |
| Feb | 74.4 mm (2.9 in) | 6 February 1896 |
| Mar | 145.3 mm (5.7 in) | 1 March 1914 |
| Apr | 109.5 mm (4.3 in) | 15 April 1909 |
| May | 105.2 mm (4.1 in) | 27 May 1946 |
| Jun | 102.1 mm (4.0 in) | 13 June 1936 |
| Jul | 133.4 mm (5.3 in) | 23 July 1953 |
| Aug | 123.2 mm (4.9 in) | 4 August 1915 |
| Sep | 123.4 mm (4.9 in) | 30 September 1920 |
| Oct | 208.3 mm (8.2 in) | 16 October 1955 |
| Nov | 91.9 mm (3.6 in) | 26 November 1900 |
| Dec | 84.1 mm (3.3 in) | 31 December 1901 |
Period of Record Coverage
1893 to 1956| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1893 | 363 | 99% | Yes |
| 1894 | 364 | 100% | Yes |
| 1895 | 363 | 99% | Yes |
| 1896 | 366 | 100% | Yes |
| 1897 | 364 | 100% | Yes |
| 1898 | 332 | 91% | Yes |
| 1899 | 365 | 100% | Yes |
| 1900 | 365 | 100% | Yes |
| 1901 | 362 | 99% | Yes |
| 1902 | 365 | 100% | Yes |
| 1903 | 365 | 100% | Yes |
| 1904 | 366 | 100% | Yes |
| 1905 | 365 | 100% | Yes |
| 1906 | 364 | 100% | Yes |
| 1907 | 365 | 100% | Yes |
| 1908 | 366 | 100% | Yes |
| 1909 | 364 | 100% | Yes |
| 1910 | 365 | 100% | Yes |
| 1911 | 365 | 100% | Yes |
| 1912 | 366 | 100% | Yes |
| 1913 | 365 | 100% | Yes |
| 1914 | 364 | 100% | Yes |
| 1915 | 365 | 100% | Yes |
| 1916 | 365 | 100% | Yes |
| 1917 | 362 | 99% | Yes |
| 1918 | 334 | 92% | Yes |
| 1919 | 363 | 99% | Yes |
| 1920 | 365 | 100% | Yes |
| 1921 | 365 | 100% | Yes |
| 1922 | 362 | 99% | Yes |
| 1923 | 362 | 99% | Yes |
| 1924 | 361 | 99% | Yes |
| 1925 | 358 | 98% | Yes |
| 1926 | 353 | 97% | Yes |
| 1927 | 361 | 99% | Yes |
| 1928 | 363 | 99% | Yes |
| 1929 | 362 | 99% | Yes |
| 1930 | 364 | 100% | Yes |
| 1931 | 358 | 98% | Yes |
| 1932 | 362 | 99% | Yes |
| 1933 | 363 | 99% | Yes |
| 1934 | 357 | 98% | Yes |
| 1935 | 360 | 99% | Yes |
| 1936 | 361 | 99% | Yes |
| 1937 | 359 | 98% | Yes |
| 1938 | 357 | 98% | Yes |
| 1939 | 359 | 98% | Yes |
| 1940 | 361 | 99% | Yes |
| 1941 | 363 | 99% | Yes |
| 1942 | 358 | 98% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 359 | 98% | Yes |
| 1945 | 355 | 97% | Yes |
| 1946 | 358 | 98% | Yes |
| 1947 | 362 | 99% | Yes |
| 1948 | 363 | 99% | Yes |
| 1949 | 355 | 97% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 358 | 98% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 363 | 99% | Yes |
| 1955 | 351 | 96% | Yes |
| 1956 | 102 | 28% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 8 April 1956 | Norwalk, US | daily snowfall (Tie) | 5.1 cm (2.0 in) | tie | 40 years | 4 of 100 (Routine) |
| 26 March 1956 | Norwalk, US | daily snow depth | 5.1 cm (2.0 in) | 5.1 cm (2.0 in) | 30 years | 19 of 100 (Routine) |
| 25 March 1956 | Norwalk, US | daily snow depth | 10.2 cm (4.0 in) | 10.2 cm (4.0 in) | 30 years | 24 of 100 (Routine) |
| 24 March 1956 | Norwalk, US | daily snow depth | 10.2 cm (4.0 in) | 10.2 cm (4.0 in) | 30 years | 24 of 100 (Routine) |
| 23 March 1956 | Norwalk, US | daily snow depth | 7.6 cm (3.0 in) | 7.6 cm (3.0 in) | 30 years | 20 of 100 (Routine) |
| 22 March 1956 | Norwalk, US | daily low min | -10.6 C (12.9 F) | 0.6 C (1.1 F) | 47 years | 21 of 100 (Routine) |
| 22 March 1956 | Norwalk, US | daily snow depth | 10.2 cm (4.0 in) | 5.1 cm (2.0 in) | 16 years | 14 of 100 (Routine) |
| 21 March 1956 | Norwalk, US | daily snow depth | 15.2 cm (6.0 in) | 15.2 cm (6.0 in) | 30 years | 29 of 100 (Routine) |
| 20 March 1956 | Norwalk, US | daily snow depth | 22.9 cm (9.0 in) | 5.1 cm (2.0 in) | 12 years | 13 of 100 (Routine) |
| 19 March 1956 | Norwalk, US | daily snow depth | 35.6 cm (14.0 in) | 35.6 cm (14.0 in) | 30 years | 49 of 100 (Notable) |
| 19 March 1956 | Norwalk, US | daily snowfall | 17.8 cm (7.0 in) | 12.7 cm (5.0 in) | 49 years | 46 of 100 (Notable) |
| 19 March 1956 | Norwalk, US | daily low max | -2.2 C (28.0 F) | 1.1 C (2.0 F) | 39 years | 19 of 100 (Routine) |
| 18 March 1956 | Norwalk, US | daily snow depth | 17.8 cm (7.0 in) | 5.1 cm (2.0 in) | 7 years | 12 of 100 (Routine) |
| 17 March 1956 | Norwalk, US | daily snow depth | 17.8 cm (7.0 in) | 17.8 cm (7.0 in) | 30 years | 31 of 100 (Routine) |
| 16 March 1956 | Norwalk, US | daily snow depth | 10.2 cm (4.0 in) | 5.1 cm (2.0 in) | 16 years | 14 of 100 (Routine) |
| 4 March 1956 | Norwalk, US | daily high min | 2.8 C (37.0 F) | 1.1 C (2.0 F) | 33 years | 17 of 100 (Routine) |
| 18 February 1956 | Norwalk, US | daily rain | 25.4 mm (1.0 in) | 7.4 mm (0.29 in) | 28 years | 19 of 100 (Routine) |
| 17 February 1956 | Norwalk, US | daily snow depth | 2.5 cm (1.0 in) | 2.5 cm (1.0 in) | 28 years | 15 of 100 (Routine) |
| 30 January 1956 | Norwalk, US | daily rain | 18.3 mm (0.7 in) | 0.5 mm (0.02 in) | 46 years | 20 of 100 (Routine) |
| 20 January 1956 | Norwalk, US | daily snow depth | 2.5 cm (1.0 in) | 2.5 cm (1.0 in) | 28 years | 14 of 100 (Routine) |
Climate Trend
60 complete years, 1893 to 1954| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1893 | 8.3 C | -1.57 C |
| 1894 | 9.5 C | -0.28 C |
| 1895 | 8.9 C | -0.95 C |
| 1896 | 9.2 C | -0.66 C |
| 1897 | 9.5 C | -0.36 C |
| 1899 | 9.1 C | -0.75 C |
| 1900 | 10.5 C | +0.65 C |
| 1901 | 9.3 C | -0.49 C |
| 1902 | 9.5 C | -0.34 C |
| 1903 | 9.4 C | -0.47 C |
| 1904 | 7.9 C | -1.93 C |
| 1905 | 9.0 C | -0.86 C |
| 1906 | 9.9 C | +0.03 C |
| 1907 | 8.5 C | -1.35 C |
| 1908 | 9.8 C | -0.03 C |
| 1909 | 9.4 C | -0.43 C |
| 1910 | 9.7 C | -0.09 C |
| 1911 | 9.8 C | +0.00 C |
| 1912 | 9.4 C | -0.38 C |
| 1913 | 10.8 C | +1.00 C |
| 1914 | 9.1 C | -0.68 C |
| 1915 | 9.8 C | +0.00 C |
| 1916 | 9.0 C | -0.82 C |
| 1917 | 8.3 C | -1.53 C |
| 1919 | 10.2 C | +0.42 C |
| 1920 | 9.4 C | -0.46 C |
| 1921 | 10.9 C | +1.04 C |
| 1922 | 10.1 C | +0.29 C |
| 1923 | 9.6 C | -0.18 C |
| 1924 | 9.2 C | -0.66 C |
| 1925 | 9.9 C | +0.07 C |
| 1926 | 8.7 C | -1.10 C |
| 1927 | 9.8 C | +0.00 C |
| 1928 | 10.0 C | +0.13 C |
| 1929 | 10.0 C | +0.21 C |
| 1930 | 10.4 C | +0.57 C |
| 1931 | 11.2 C | +1.37 C |
| 1932 | 10.9 C | +1.04 C |
| 1933 | 10.6 C | +0.79 C |
| 1934 | 9.8 C | -0.01 C |
| 1935 | 9.9 C | +0.07 C |
| 1936 | 10.1 C | +0.29 C |
| 1937 | 10.7 C | +0.85 C |
| 1938 | 10.8 C | +0.96 C |
| 1939 | 9.9 C | +0.08 C |
| 1940 | 8.7 C | -1.14 C |
| 1941 | 10.2 C | +0.39 C |
| 1942 | 10.1 C | +0.28 C |
| 1943 | 9.8 C | -0.02 C |
| 1944 | 10.2 C | +0.41 C |
| 1945 | 10.2 C | +0.38 C |
| 1946 | 10.8 C | +0.99 C |
| 1947 | 10.1 C | +0.28 C |
| 1948 | 9.6 C | -0.20 C |
| 1949 | 11.2 C | +1.34 C |
| 1950 | 9.6 C | -0.20 C |
| 1951 | 10.6 C | +0.74 C |
| 1952 | 10.7 C | +0.89 C |
| 1953 | 11.4 C | +1.56 C |
| 1954 | 10.4 C | +0.60 C |
The annual mean temperature here has risen by 0.2 C (0.2 to 0.3) per decade over 1893 to 1954. In Fahrenheit: 0.4 F (0.3 to 0.6) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.6) per decade | 1893 to 1954 | 60 | Rise |
| Mean daily maximum | 0.3 C (0.2 to 0.4) per decade | 0.6 F (0.4 to 0.8) per decade | 1893 to 1954 | 60 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1893 to 1954 | 60 | 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
1893 to 1956| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1948 | 36.1 C (97.0 F) | 64 |
| Coldest night (TNn) | -30.0 C (-22.0 F) | 1904 | -21.1 C (-6.0 F) | 64 |
| Wettest day (Rx1day) | 208.3 mm (8.2 in) | 1955 | 79.5 mm (3.1 in) | 64 |
| Wettest five days (Rx5day) | 329.7 mm (13.0 in) | 1955 | 99.3 mm (3.9 in) | 64 |
| Longest dry spell (CDD) | 44 days | 1924 | 17 days | 64 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | 35.6 C (96.1 F) |
| 1894 | 35.6 C (96.1 F) |
| 1895 | 35.6 C (96.1 F) |
| 1896 | 34.4 C (93.9 F) |
| 1897 | 33.3 C (91.9 F) |
| 1898 | 36.7 C (98.1 F) |
| 1899 | 36.1 C (97.0 F) |
| 1900 | 37.2 C (99.0 F) |
| 1901 | 37.8 C (100.0 F) |
| 1902 | 34.4 C (93.9 F) |
| 1903 | 36.1 C (97.0 F) |
| 1904 | 36.7 C (98.1 F) |
| 1905 | 36.7 C (98.1 F) |
| 1906 | 33.3 C (91.9 F) |
| 1907 | 33.3 C (91.9 F) |
| 1908 | 36.7 C (98.1 F) |
| 1909 | 35.6 C (96.1 F) |
| 1910 | 34.4 C (93.9 F) |
| 1911 | 37.8 C (100.0 F) |
| 1912 | 36.7 C (98.1 F) |
| 1913 | 36.1 C (97.0 F) |
| 1914 | 33.9 C (93.0 F) |
| 1915 | 33.3 C (91.9 F) |
| 1916 | 33.3 C (91.9 F) |
| 1917 | 37.2 C (99.0 F) |
| 1918 | 36.1 C (97.0 F) |
| 1919 | 37.2 C (99.0 F) |
| 1920 | 33.9 C (93.0 F) |
| 1921 | 35.6 C (96.1 F) |
| 1922 | 33.3 C (91.9 F) |
| 1923 | 37.8 C (100.0 F) |
| 1924 | 36.1 C (97.0 F) |
| 1925 | 37.2 C (99.0 F) |
| 1926 | 37.8 C (100.0 F) |
| 1927 | 33.9 C (93.0 F) |
| 1928 | 34.4 C (93.9 F) |
| 1929 | 36.7 C (98.1 F) |
| 1930 | 38.3 C (100.9 F) |
| 1931 | 36.7 C (98.1 F) |
| 1932 | 35.0 C (95.0 F) |
| 1933 | 36.7 C (98.1 F) |
| 1934 | 37.2 C (99.0 F) |
| 1935 | 35.6 C (96.1 F) |
| 1936 | 37.8 C (100.0 F) |
| 1937 | 37.2 C (99.0 F) |
| 1938 | 35.0 C (95.0 F) |
| 1939 | 34.4 C (93.9 F) |
| 1940 | 35.0 C (95.0 F) |
| 1941 | 35.0 C (95.0 F) |
| 1942 | 35.0 C (95.0 F) |
| 1943 | 36.1 C (97.0 F) |
| 1944 | 39.4 C (102.9 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 34.4 C (93.9 F) |
| 1947 | 36.1 C (97.0 F) |
| 1948 | 40.0 C (104.0 F) |
| 1949 | 38.9 C (102.0 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 37.2 C (99.0 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 18.3 C (64.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | -23.9 C (-11.0 F) |
| 1894 | -21.1 C (-6.0 F) |
| 1895 | -20.6 C (-5.1 F) |
| 1896 | -23.3 C (-9.9 F) |
| 1897 | -20.0 C (-4.0 F) |
| 1898 | -25.0 C (-13.0 F) |
| 1899 | -26.7 C (-16.1 F) |
| 1900 | -19.4 C (-2.9 F) |
| 1901 | -21.1 C (-6.0 F) |
| 1902 | -21.7 C (-7.1 F) |
| 1903 | -24.4 C (-11.9 F) |
| 1904 | -30.0 C (-22.0 F) |
| 1905 | -23.9 C (-11.0 F) |
| 1906 | -19.4 C (-2.9 F) |
| 1907 | -26.1 C (-15.0 F) |
| 1908 | -21.7 C (-7.1 F) |
| 1909 | -20.0 C (-4.0 F) |
| 1910 | -21.1 C (-6.0 F) |
| 1911 | -19.4 C (-2.9 F) |
| 1912 | -21.1 C (-6.0 F) |
| 1913 | -16.7 C (1.9 F) |
| 1914 | -22.8 C (-9.0 F) |
| 1915 | -13.3 C (8.1 F) |
| 1916 | -23.9 C (-11.0 F) |
| 1917 | -23.9 C (-11.0 F) |
| 1918 | -25.6 C (-14.1 F) |
| 1919 | -20.6 C (-5.1 F) |
| 1920 | -22.2 C (-8.0 F) |
| 1921 | -19.4 C (-2.9 F) |
| 1922 | -21.1 C (-6.0 F) |
| 1923 | -21.7 C (-7.1 F) |
| 1924 | -18.9 C (-2.0 F) |
| 1925 | -23.3 C (-9.9 F) |
| 1926 | -21.1 C (-6.0 F) |
| 1927 | -18.9 C (-2.0 F) |
| 1928 | -20.0 C (-4.0 F) |
| 1929 | -17.8 C (0.0 F) |
| 1930 | -23.9 C (-11.0 F) |
| 1931 | -16.7 C (1.9 F) |
| 1932 | -18.9 C (-2.0 F) |
| 1933 | -23.9 C (-11.0 F) |
| 1934 | -28.9 C (-20.0 F) |
| 1935 | -30.0 C (-22.0 F) |
| 1936 | -24.4 C (-11.9 F) |
| 1937 | -14.4 C (6.1 F) |
| 1938 | -20.0 C (-4.0 F) |
| 1939 | -19.4 C (-2.9 F) |
| 1940 | -21.7 C (-7.1 F) |
| 1941 | -17.2 C (1.0 F) |
| 1942 | -26.7 C (-16.1 F) |
| 1943 | -28.9 C (-20.0 F) |
| 1944 | -21.7 C (-7.1 F) |
| 1945 | -20.6 C (-5.1 F) |
| 1946 | -20.6 C (-5.1 F) |
| 1947 | -20.6 C (-5.1 F) |
| 1948 | -27.8 C (-18.0 F) |
| 1949 | -18.9 C (-2.0 F) |
| 1950 | -25.6 C (-14.1 F) |
| 1951 | -18.9 C (-2.0 F) |
| 1952 | -20.0 C (-4.0 F) |
| 1953 | -13.9 C (7.0 F) |
| 1954 | -25.6 C (-14.1 F) |
| 1955 | -21.1 C (-6.0 F) |
| 1956 | -17.2 C (1.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 82.8 mm (3.3 in) |
| 1894 | 83.8 mm (3.3 in) |
| 1895 | 56.9 mm (2.2 in) |
| 1896 | 74.4 mm (2.9 in) |
| 1897 | 114.3 mm (4.5 in) |
| 1898 | 104.4 mm (4.1 in) |
| 1899 | 49.5 mm (1.9 in) |
| 1900 | 91.9 mm (3.6 in) |
| 1901 | 109.2 mm (4.3 in) |
| 1902 | 103.9 mm (4.1 in) |
| 1903 | 86.9 mm (3.4 in) |
| 1904 | 96.3 mm (3.8 in) |
| 1905 | 96.8 mm (3.8 in) |
| 1906 | 88.9 mm (3.5 in) |
| 1907 | 80.5 mm (3.2 in) |
| 1908 | 94.0 mm (3.7 in) |
| 1909 | 109.5 mm (4.3 in) |
| 1910 | 69.1 mm (2.7 in) |
| 1911 | 125.7 mm (4.9 in) |
| 1912 | 62.7 mm (2.5 in) |
| 1913 | 101.6 mm (4.0 in) |
| 1914 | 145.3 mm (5.7 in) |
| 1915 | 123.2 mm (4.9 in) |
| 1916 | 59.9 mm (2.4 in) |
| 1917 | 68.1 mm (2.7 in) |
| 1918 | 71.6 mm (2.8 in) |
| 1919 | 80.3 mm (3.2 in) |
| 1920 | 123.4 mm (4.9 in) |
| 1921 | 55.4 mm (2.2 in) |
| 1922 | 72.6 mm (2.9 in) |
| 1923 | 119.6 mm (4.7 in) |
| 1924 | 75.2 mm (3.0 in) |
| 1925 | 86.6 mm (3.4 in) |
| 1926 | 39.1 mm (1.5 in) |
| 1927 | 61.2 mm (2.4 in) |
| 1928 | 44.7 mm (1.8 in) |
| 1929 | 44.7 mm (1.8 in) |
| 1930 | 45.5 mm (1.8 in) |
| 1931 | 71.9 mm (2.8 in) |
| 1932 | 55.1 mm (2.2 in) |
| 1933 | 67.6 mm (2.7 in) |
| 1934 | 69.1 mm (2.7 in) |
| 1935 | 26.9 mm (1.1 in) |
| 1936 | 102.1 mm (4.0 in) |
| 1937 | 97.0 mm (3.8 in) |
| 1938 | 52.1 mm (2.1 in) |
| 1939 | 78.7 mm (3.1 in) |
| 1940 | 71.6 mm (2.8 in) |
| 1941 | 68.6 mm (2.7 in) |
| 1942 | 77.7 mm (3.1 in) |
| 1943 | 78.2 mm (3.1 in) |
| 1944 | 118.1 mm (4.6 in) |
| 1945 | 82.6 mm (3.3 in) |
| 1946 | 105.2 mm (4.1 in) |
| 1947 | 84.8 mm (3.3 in) |
| 1948 | 70.1 mm (2.8 in) |
| 1949 | 59.7 mm (2.4 in) |
| 1950 | 38.6 mm (1.5 in) |
| 1951 | 59.4 mm (2.3 in) |
| 1952 | 87.6 mm (3.4 in) |
| 1953 | 133.4 mm (5.3 in) |
| 1954 | 112.3 mm (4.4 in) |
| 1955 | 208.3 mm (8.2 in) |
| 1956 | 25.4 mm (1.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 118.9 mm (4.7 in) |
| 1894 | 83.8 mm (3.3 in) |
| 1895 | 60.5 mm (2.4 in) |
| 1896 | 86.4 mm (3.4 in) |
| 1897 | 114.3 mm (4.5 in) |
| 1898 | 108.7 mm (4.3 in) |
| 1899 | 85.3 mm (3.4 in) |
| 1900 | 97.2 mm (3.8 in) |
| 1901 | 128.8 mm (5.1 in) |
| 1902 | 132.1 mm (5.2 in) |
| 1903 | 133.9 mm (5.3 in) |
| 1904 | 98.4 mm (3.9 in) |
| 1905 | 137.5 mm (5.4 in) |
| 1906 | 98.5 mm (3.9 in) |
| 1907 | 86.4 mm (3.4 in) |
| 1908 | 179.3 mm (7.1 in) |
| 1909 | 109.5 mm (4.3 in) |
| 1910 | 73.4 mm (2.9 in) |
| 1911 | 148.3 mm (5.8 in) |
| 1912 | 119.3 mm (4.7 in) |
| 1913 | 121.9 mm (4.8 in) |
| 1914 | 147.3 mm (5.8 in) |
| 1915 | 146.0 mm (5.7 in) |
| 1916 | 89.2 mm (3.5 in) |
| 1917 | 80.0 mm (3.1 in) |
| 1918 | 84.3 mm (3.3 in) |
| 1919 | 104.3 mm (4.1 in) |
| 1920 | 142.2 mm (5.6 in) |
| 1921 | 66.6 mm (2.6 in) |
| 1922 | 84.3 mm (3.3 in) |
| 1923 | 138.1 mm (5.4 in) |
| 1924 | 85.9 mm (3.4 in) |
| 1925 | 147.3 mm (5.8 in) |
| 1926 | 46.7 mm (1.8 in) |
| 1927 | 78.5 mm (3.1 in) |
| 1928 | 51.6 mm (2.0 in) |
| 1929 | 73.7 mm (2.9 in) |
| 1930 | 126.3 mm (5.0 in) |
| 1931 | 80.5 mm (3.2 in) |
| 1932 | 65.3 mm (2.6 in) |
| 1933 | 99.3 mm (3.9 in) |
| 1934 | 99.3 mm (3.9 in) |
| 1935 | 51.1 mm (2.0 in) |
| 1936 | 132.4 mm (5.2 in) |
| 1937 | 99.0 mm (3.9 in) |
| 1938 | 88.4 mm (3.5 in) |
| 1939 | 88.9 mm (3.5 in) |
| 1940 | 77.4 mm (3.0 in) |
| 1941 | 87.1 mm (3.4 in) |
| 1942 | 110.2 mm (4.3 in) |
| 1943 | 96.3 mm (3.8 in) |
| 1944 | 214.7 mm (8.5 in) |
| 1945 | 125.8 mm (5.0 in) |
| 1946 | 112.3 mm (4.4 in) |
| 1947 | 131.0 mm (5.2 in) |
| 1948 | 114.3 mm (4.5 in) |
| 1949 | 118.4 mm (4.7 in) |
| 1950 | 70.6 mm (2.8 in) |
| 1951 | 95.2 mm (3.7 in) |
| 1952 | 140.5 mm (5.5 in) |
| 1953 | 180.1 mm (7.1 in) |
| 1954 | 117.3 mm (4.6 in) |
| 1955 | 329.7 mm (13.0 in) |
| 1956 | 63.0 mm (2.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 15 days |
| 1894 | 19 days |
| 1895 | 21 days |
| 1896 | 14 days |
| 1897 | 12 days |
| 1898 | 13 days |
| 1899 | 23 days |
| 1900 | 19 days |
| 1901 | 25 days |
| 1902 | 15 days |
| 1903 | 36 days |
| 1904 | 16 days |
| 1905 | 17 days |
| 1906 | 16 days |
| 1907 | 11 days |
| 1908 | 23 days |
| 1909 | 25 days |
| 1910 | 30 days |
| 1911 | 17 days |
| 1912 | 17 days |
| 1913 | 13 days |
| 1914 | 25 days |
| 1915 | 22 days |
| 1916 | 14 days |
| 1917 | 20 days |
| 1918 | 19 days |
| 1919 | 15 days |
| 1920 | 14 days |
| 1921 | 16 days |
| 1922 | 25 days |
| 1923 | 21 days |
| 1924 | 44 days |
| 1925 | 12 days |
| 1926 | 17 days |
| 1927 | 13 days |
| 1928 | 12 days |
| 1929 | 13 days |
| 1930 | 21 days |
| 1931 | 19 days |
| 1932 | 18 days |
| 1933 | 12 days |
| 1934 | 17 days |
| 1935 | 12 days |
| 1936 | 13 days |
| 1937 | 14 days |
| 1938 | 15 days |
| 1939 | 26 days |
| 1940 | 14 days |
| 1941 | 20 days |
| 1942 | 20 days |
| 1943 | 19 days |
| 1944 | 15 days |
| 1945 | 11 days |
| 1946 | 14 days |
| 1947 | 23 days |
| 1948 | 20 days |
| 1949 | 22 days |
| 1950 | 17 days |
| 1951 | 12 days |
| 1952 | 29 days |
| 1953 | 17 days |
| 1954 | 11 days |
| 1955 | 15 days |
| 1956 | 11 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
60 years with a frostAcross 60 years with a frost, the median last spring frost at Norwalk falls on 1 May and the median first autumn frost on 10 October, which leaves a median of 162 days between them.
In 1925 to 1954 the median growing season was 162 days. The two periods have the same number of growing days.
Fitted over all years, the growing season changes by -1.5 days per decade at this station.
| Measure | Median, all years | Earliest period (1893 to 1924) | Recent period (1925 to 1954) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 1 May | 2 May | 30 April | 2 days earlier | +0.5 days per decade |
| First autumn frost | 10 October | 11 October | 8 October | 3 days earlier | -1.1 days per decade |
| Growing days | 162 days | 162 days | 162 days | no change | -1.5 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.
Rainfall Return Levels
51 years, 1893 to 1955A day with at least 84.9 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 176.4 mm (6.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 84.9 mm (3.3 in) | |
| 5 years | 110.8 mm (4.4 in) | |
| 10 years | 127.4 mm (5.0 in) | |
| 25 years | 147.7 mm (5.8 in) | |
| 50 years | 162.3 mm (6.4 in) | |
| 100 years | 176.4 mm (6.9 in) | Longer than the 51 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, 51 years of values from 1893 to 1955.
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: 208.3 mm (8.2 in) in 1955; 145.3 mm (5.7 in) in 1914; 133.4 mm (5.3 in) in 1953.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Norwalk, at 1932 and 1939. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1932 ran 0.3 C (0.5 F) higher than in the years before (likely change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1939 ran 0.4 C (0.8 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1932 | +0.3 | +0.5 | likely | 5 |
| 1939 | -0.4 | -0.8 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).