year,winter_end,winter,summer_end,summer,winter_end_doy,summer_end_doy,spring_length,fall_length
1893,,,1893-09-09,70.71195652173913,,252,,79.0
1894,1894-02-26,16.33695652173913,1894-09-08,77.34782608695652,57.0,251,103.0,99.0
1895,1895-03-17,17.967391304347824,1895-09-21,71.67391304347827,76.0,264,97.0,60.0
1896,1896-02-19,21.494565217391305,1896-09-02,71.32065217391305,50.0,246,105.0,103.0
1897,1897-03-16,22.820652173913043,1897-09-13,74.08695652173913,75.0,256,90.0,74.0
1898,1898-02-25,19.293478260869566,1898-09-03,72.6304347826087,56.0,246,99.0,80.0
1899,1899-02-21,16.86413043478261,1899-09-07,73.1304347826087,52.0,250,107.0,88.0
1900,1900-03-05,20.85326086956522,1900-09-13,73.91304347826087,64.0,256,101.0,83.0
1901,1901-03-06,22.902173913043477,1901-09-09,76.875,65.0,252,96.0,84.0
1902,1902-03-03,19.527173913043477,1902-08-31,69.29891304347827,62.0,243,90.0,93.0
1903,1903-03-03,21.51086956521739,1903-09-12,69.90760869565217,62.0,255,102.0,75.0
1904,1904-02-25,16.179347826086957,1904-09-07,69.08152173913044,56.0,251,104.0,77.0
1905,1905-02-23,16.72826086956522,1905-09-01,72.13586956521739,54.0,244,99.0,112.0
1906,1906-03-23,20.86413043478261,1906-09-16,71.44565217391305,82.0,259,86.0,57.0
1907,1907-02-11,23.45108695652174,1907-09-19,69.31521739130434,42.0,262,129.0,71.0
1908,1908-02-28,26.190217391304348,1908-09-17,70.8695652173913,59.0,261,111.0,70.0
1909,1909-02-26,25.668478260869566,1909-08-28,73.19565217391305,57.0,240,92.0,96.0
1910,1910-03-03,16.53804347826087,1910-09-08,72.75,62.0,251,98.0,82.0
1911,1911-02-28,23.97826086956522,1911-08-22,75.58152173913044,59.0,234,84.0,123.0
1912,1912-03-23,12.91304347826087,1912-09-10,73.3695652173913,83.0,254,80.0,86.0
1913,1913-03-07,22.86413043478261,1913-09-11,76.88586956521739,66.0,254,97.0,102.0
1914,1914-03-23,24.630434782608695,1914-09-01,73.90760869565217,82.0,244,71.0,99.0
1915,1915-03-10,19.929347826086957,1915-09-20,68.15217391304348,69.0,263,103.0,79.0
1916,1916-03-08,20.03804347826087,1916-09-09,73.27173913043478,68.0,253,94.0,89.0
1917,1917-03-09,15.951086956521738,1917-09-08,70.31521739130434,68.0,251,92.0,76.0
1918,1918-02-22,15.391304347826088,1918-08-28,74.1195652173913,53.0,240,96.0,104.0
1919,1919-03-11,27.690217391304348,1919-09-10,75.625,70.0,253,92.0,81.0
1920,1920-02-29,17.29891304347826,1920-08-21,71.14673913043478,60.0,234,83.0,80.0
1921,1921-02-09,29.092391304347824,1921-09-05,74.79891304347827,40.0,248,117.0,88.0
1922,1922-03-03,23.255434782608695,1922-09-08,73.44565217391305,62.0,251,98.0,77.0
1923,1923-02-23,23.293478260869566,1923-09-11,72.91304347826087,54.0,254,109.0,103.0
1924,1924-03-23,22.63586956521739,1924-09-08,70.19565217391305,83.0,252,78.0,83.0
1925,1925-03-02,21.36413043478261,1925-09-10,73.02717391304348,61.0,253,101.0,94.0
1926,1926-03-14,24.60326086956522,1926-09-04,73.03260869565217,73.0,247,83.0,77.0
1927,1927-02-19,24.72826086956522,1927-09-17,73.08695652173913,50.0,260,119.0,74.0
1928,1928-02-29,24.97826086956522,1928-09-15,72.05434782608695,60.0,259,108.0,76.0
1929,1929-03-02,17.625,1929-09-04,72.2445652173913,61.0,247,95.0,75.0
1930,1930-02-17,21.119565217391305,1930-09-19,75.78260869565217,48.0,262,123.0,65.0
1931,1931-02-22,29.641304347826086,1931-09-16,75.78260869565217,53.0,259,115.0,99.0
1932,1932-03-24,25.347826086956523,1932-08-31,73.03260869565217,84.0,244,69.0,75.0
1933,1933-02-14,24.03804347826087,1933-09-01,74.42934782608695,45.0,244,108.0,100.0
1934,1934-03-11,25.016304347826086,1934-08-27,77.2336956521739,70.0,239,78.0,94.0
1935,1935-02-28,23.20108695652174,1935-09-24,72.5,59.0,267,117.0,65.0
1936,1936-02-27,12.152173913043478,1936-09-14,78.09239130434783,58.0,258,109.0,76.0
1937,1937-03-01,19.597826086956523,1937-09-11,74.76086956521739,60.0,254,103.0,69.0
1938,1938-02-18,22.456521739130434,1938-09-13,75.2445652173913,49.0,256,116.0,87.0
1939,1939-03-10,23.777173913043477,1939-09-15,73.20652173913044,69.0,258,98.0,101.0
1940,1940-03-25,18.88586956521739,1940-08-29,72.09782608695652,85.0,242,66.0,91.0
1941,1941-02-28,24.119565217391305,1941-09-16,73.14673913043478,59.0,259,109.0,83.0
1942,1942-03-09,24.630434782608695,1942-09-17,71.60326086956522,68.0,260,101.0,70.0
1943,1943-02-25,20.32608695652174,1943-09-07,73.0054347826087,56.0,250,103.0,94.0
1944,1944-03-10,26.375,1944-08-23,72.52173913043478,70.0,236,75.0,96.0
1945,1945-02-27,20.0,1945-09-09,71.07608695652173,58.0,252,103.0,73.0
1946,1946-02-20,21.543478260869566,1946-09-09,70.79347826086956,51.0,252,110.0,95.0
1947,1947-03-14,22.608695652173914,1947-09-21,75.53804347826087,73.0,264,100.0,83.0
1948,1948-03-13,21.184782608695652,1948-09-21,73.28260869565217,73.0,265,101.0,75.0
1949,1949-03-07,20.695652173913043,1949-08-29,73.8586956521739,66.0,241,84.0,105.0
1950,1950-03-13,21.565217391304348,1950-09-04,68.8804347826087,72.0,247,84.0,77.0
1951,1951-02-19,18.706521739130434,1951-09-11,69.7445652173913,50.0,254,113.0,88.0
1952,1952-03-08,21.706521739130434,1952-09-01,72.58695652173913,68.0,245,86.0,82.0
1953,1953-02-22,23.79891304347826,1953-09-02,73.5054347826087,53.0,245,101.0,103.0
1954,1954-03-15,26.815217391304348,1954-09-06,75.21195652173913,74.0,249,84.0,84.0
1955,1955-02-28,23.358695652173914,1955-09-18,75.20108695652173,59.0,261,111.0,71.0
1956,1956-02-27,19.945652173913043,1956-09-03,74.1195652173913,58.0,247,98.0,80.0
1957,1957-02-22,23.168478260869566,1957-09-03,73.33695652173913,53.0,246,102.0,79.0
1958,1958-02-20,22.23913043478261,1958-09-25,69.57608695652173,51.0,268,126.0,62.0
1959,1959-02-25,18.108695652173914,1959-09-08,73.41304347826087,56.0,251,104.0,111.0
1960,1960-03-28,19.0,1960-09-08,71.90760869565217,88.0,252,73.0,81.0
1961,1961-02-28,24.233695652173914,1961-09-10,71.42391304347827,59.0,253,103.0,88.0
1962,1962-03-08,15.994565217391305,1962-09-03,70.95652173913044,67.0,246,88.0,94.0
1963,1963-03-07,17.54891304347826,1963-08-29,72.66304347826087,66.0,241,84.0,92.0
1964,1964-02-28,23.630434782608695,1964-09-10,71.90217391304348,59.0,254,104.0,77.0
1965,1965-02-26,19.53804347826087,1965-08-30,71.27717391304348,57.0,242,94.0,89.0
1966,1966-02-26,23.054347826086957,1966-09-10,71.88586956521739,57.0,253,105.0,78.0
1967,1967-02-26,22.72826086956522,1967-08-22,69.33695652173913,57.0,234,86.0,103.0
1968,1968-03-03,23.10326086956522,1968-08-31,71.9945652173913,63.0,244,90.0,104.0
1969,1969-03-15,18.32608695652174,1969-09-16,71.38586956521739,74.0,259,94.0,74.0
1970,1970-02-28,19.782608695652176,1970-09-07,72.9836956521739,59.0,250,100.0,94.0
1971,1971-03-11,19.184782608695652,1971-09-09,72.59782608695652,70.0,252,91.0,80.0
1972,1972-02-27,19.63586956521739,1972-08-31,70.95108695652173,58.0,244,95.0,79.0
1973,1973-02-18,21.092391304347824,1973-09-03,73.08695652173913,49.0,246,106.0,88.0
1974,1974-03-01,21.244565217391305,1974-08-27,71.64673913043478,60.0,239,88.0,109.0
1975,1975-03-15,21.755434782608695,1975-09-03,72.83695652173913,74.0,246,81.0,82.0
1976,1976-02-23,26.505434782608695,1976-09-07,72.02173913043478,54.0,251,106.0,75.0
1977,1977-02-21,17.755434782608695,1977-08-13,74.4945652173913,52.0,225,82.0,113.0
1978,1978-03-05,14.103260869565217,1978-09-13,72.86413043478261,64.0,256,101.0,75.0
1979,1979-02-26,12.391304347826088,1979-09-05,71.57065217391305,57.0,248,100.0,98.0
1980,1980-03-12,22.809782608695652,1980-09-09,73.80434782608695,72.0,253,90.0,65.0
1981,1981-02-13,24.597826086956523,1981-08-31,71.96739130434783,44.0,243,108.0,100.0
1982,1982-03-10,16.342391304347824,1982-09-13,71.03260869565217,69.0,256,96.0,61.0
1983,1983-02-12,27.059782608695652,1983-09-10,76.53804347826087,43.0,253,119.0,72.0
1984,1984-02-20,18.733695652173914,1984-09-02,73.04347826086956,51.0,246,104.0,86.0
1985,1985-02-27,21.255434782608695,1985-09-20,71.16304347826087,58.0,263,114.0,61.0
1986,1986-02-19,17.483695652173914,1986-08-27,72.14673913043478,50.0,239,98.0,75.0
1987,1987-02-09,27.690217391304348,1987-08-24,73.75,40.0,236,105.0,94.0
1988,1988-02-25,22.25,1988-08-25,76.1304347826087,56.0,238,91.0,103.0
1989,1989-03-08,23.217391304347824,1989-09-09,71.79347826086956,67.0,252,94.0,80.0
1990,1990-02-27,24.83695652173913,1990-09-10,73.27173913043478,58.0,253,104.0,79.0
1991,1991-02-27,21.168478260869566,1991-09-09,73.1304347826087,58.0,252,103.0,51.0
1992,1992-01-29,28.02173913043478,1992-08-30,67.9836956521739,29.0,243,123.0,89.0
1993,1993-02-27,20.244565217391305,1993-09-05,71.16304347826087,58.0,248,99.0,86.0
1994,1994-03-01,18.244565217391305,1994-08-28,70.7554347826087,60.0,240,89.0,102.0
1995,1995-03-09,21.815217391304348,1995-09-06,73.52173913043478,68.0,249,90.0,93.0
1996,1996-03-08,20.21195652173913,1996-09-09,71.6304347826087,68.0,253,94.0,69.0
1997,1997-02-17,19.527173913043477,1997-09-09,72.08695652173913,48.0,252,113.0,62.0
1998,1998-02-09,26.559782608695652,1998-09-20,73.625,40.0,263,132.0,85.0
1999,1999-03-15,25.108695652173914,1999-09-04,73.17934782608695,74.0,247,82.0,79.0
2000,2000-02-21,27.565217391304348,2000-09-19,72.3913043478261,52.0,263,120.0,73.0
2001,2001-03-03,16.668478260869566,2001-09-07,73.94565217391305,62.0,250,97.0,95.0
2002,2002-03-12,28.78804347826087,2002-09-09,74.17391304347827,71.0,252,90.0,91.0
2003,2003-03-10,23.277173913043477,2003-09-11,73.02173913043478,69.0,254,94.0,72.0
2004,2004-02-21,23.29891304347826,2004-09-05,69.32608695652173,52.0,249,106.0,98.0
2005,2005-03-14,25.67391304347826,2005-09-13,73.69565217391305,73.0,256,92.0,72.0
2006,2006-02-23,26.684782608695652,2006-08-25,73.90217391304348,54.0,237,92.0,97.0
2007,2007-03-01,23.652173913043477,2007-09-06,74.48913043478261,60.0,249,98.0,84.0
2008,2008-02-28,18.429347826086957,2008-09-02,71.7445652173913,59.0,246,96.0,89.0
2009,2009-03-02,19.945652173913043,2009-09-15,69.56521739130434,61.0,258,106.0,79.0
2010,2010-03-04,16.48913043478261,2010-08-23,74.31521739130434,63.0,235,81.0,100.0
2011,2011-03-02,20.22826086956522,2011-09-02,74.34239130434783,61.0,245,93.0,87.0
2012,2012-02-27,30.119565217391305,2012-09-05,75.57608695652173,58.0,249,100.0,106.0
2013,2013-03-22,23.217391304347824,2013-09-11,74.03804347826087,81.0,254,82.0,85.0
2014,2014-03-06,15.402173913043478,2014-09-05,71.09239130434783,65.0,248,92.0,90.0
2015,2015-03-05,23.304347826086957,2015-09-08,71.83152173913044,64.0,251,96.0,72.0
2016,2016-02-18,26.456521739130434,2016-09-08,74.16847826086956,49.0,252,112.0,71.0
2017,2017-02-18,28.10326086956522,2017-08-31,72.78260869565217,49.0,243,103.0,98.0
2018,2018-03-08,22.157608695652176,2018-08-21,74.57065217391305,67.0,233,75.0,107.0
2019,2019-03-07,20.64673913043478,2019-09-22,73.16304347826087,66.0,265,108.0,68.0
2020,2020-02-28,26.777173913043477,2020-08-31,74.58152173913044,59.0,244,94.0,90.0
2021,2021-03-01,21.222826086956523,2021-09-02,75.55434782608695,60.0,245,94.0,100.0
2022,2022-03-12,25.407608695652176,2022-09-09,75.2336956521739,71.0,252,90.0,79.0
2023,2023-02-26,25.869565217391305,2023-08-29,73.72826086956522,57.0,241,93.0,84.0
2024,2024-02-20,31.38586956521739,2024-08-31,74.1086956521739,51.0,244,102.0,