"Figure 1. First Leaf and Bloom Dates in the Contiguous 48 States, 1900-2023",,,,
Source: EPA's Climate Change Indicators in the United States: www.epa.gov/climate-indicators,,,,
"Data source: Schwartz, 2024",,,,
Web update: June 2024,,,,
Units: days deviation from 1981-2010 average,,,,
,,,,
Year,Leaf Mean,Leaf 9-yr normal curve,Bloom Mean,Bloom 9-yr normal curve
1900,3.817582418,4.111794838,1.591208791,2.402882392
1901,6.044345898,3.863036946,3.086474501,2.40331256
1902,2.717573222,3.458499802,3.248953975,2.355315045
1903,-0.417794971,3.250132198,-0.361702128,2.326410353
1904,7.751811594,3.144465494,5.202898551,2.282434307
1905,1.84283247,2.599073873,1.063903282,2.108998588
1906,3.403141361,1.504248529,1.984293194,1.694854264
1907,-4.244027304,0.542674551,1.546075085,1.110749211
1908,1.85451505,-0.009563898,-0.419732441,0.217119116
1909,2.788375559,-0.455816709,4.350223547,-1.016699476
1910,-5.797101449,-0.483693783,-10.92898551,-1.615115367
1911,-3.605413105,0.558035782,-2.465811966,-0.75435996
1912,9.879334258,2.128759991,7.425797503,0.82465998
1913,1.676712329,3.084732936,1.123287671,1.699164142
1914,2.112840467,3.199448542,1.459143969,1.707161958
1915,5.845663265,3.000694494,0.428571429,1.785897417
1916,-1.087173101,2.722011998,0.506849315,2.24652156
1917,7.1001221,2.252934901,8.421245421,2.569912554
1918,-2.101234568,1.751005863,-1.609876543,2.501618863
1919,1.770935961,1.188387682,2.153940887,2.058181238
1920,5.307106599,0.67218026,7.883248731,1.312891478
1921,-8.749394673,0.693470975,-8.089588378,0.693810046
1922,5.045243619,1.589942515,1.787703016,0.887284478
1923,3.259860789,2.586456796,2.708816705,1.484258686
1924,8.830080367,2.431052095,8.182548794,1.213440671
1925,-5.41599073,1.397916244,-7.44032445,0.242195736
1926,3.059350504,0.480392147,1.077267637,-0.338039753
1927,-1.966304348,0.163762756,-1.302173913,-0.166013538
1928,0.322510823,0.089885311,1.866883117,0.022623677
1929,3.417465389,-0.239545091,2.072417465,-0.301440067
1930,-4.4217119,-0.843481391,-5.107515658,-0.857444415
1931,-0.23107178,-1.401800764,0.825958702,-1.166278211
1932,-2.792507205,-1.657779855,-2.889529299,-1.141221675
1933,0.077140169,-1.705659411,1.931326435,-1.053666572
1934,-4.502343018,-1.322968869,-5.007497657,-0.805840415
1935,-1.761152416,-0.328608694,1.359665428,-0.343699463
1936,4.234432234,0.658485563,0.812271062,-0.093095547
1937,4.426040744,0.886061034,2.938883968,-0.471552041
1938,-5.279931094,0.884542362,-6.260981912,-0.880450377
1939,-0.407014682,1.617172586,-2.269983687,-0.526881915
1940,8.568396226,2.681276704,4.983490566,0.275588108
1941,2.987401575,2.910794633,-0.196850394,0.681275059
1942,2.417876241,2.218300292,0.521772345,0.549830565
1943,-2.029208301,1.361644813,-1.055342045,0.212006787
1944,5.858113208,0.505048377,4.180377358,-0.494108632
1945,-3.006074412,-0.125505886,-3.701594533,-1.279326255
1946,-5.943368107,0.188824485,-8.020864382,-1.214105269
1947,5.393103448,1.430292396,5.204597701,-0.227256691
1948,5.685734463,2.409758644,1.860875706,0.729686097
1949,1.303959132,2.389613504,-1.453384419,1.14133798
1950,0.496363636,1.849952827,3.057575758,1.218926401
1951,3.122724604,1.132285547,2.364063417,0.971083561
1952,1.495145631,0.195725871,-1.145059966,0.407821779
1953,-3.797109505,-0.420291105,0.721511951,-0.070076855
1954,-3.587458746,0.143792843,-2.627062706,0.027244609
1955,4.168810289,1.737271575,0.139335477,0.727757137
1956,5.298687664,3.360440882,5.020997375,1.662297187
1957,2.798575788,4.35044409,-1.107833164,2.483852311
1958,7.674784373,4.746932993,6.491121258,3.101299005
1959,2.309796121,4.756555474,1.346096469,3.514375423
1960,7.236328125,4.471125944,5.98828125,3.516934281
1961,2.426198386,4.076406672,3.414333175,3.093674709
1962,4.047685185,3.864282854,1.485648148,2.663283011
1963,1.503809951,4.071655398,-0.251008516,2.808163624
1964,7.258652095,4.362082436,5.713114754,3.511111408
1965,5.286534216,4.092284459,4.645474614,4.036661392
1966,3.819700214,3.235638584,6.050963597,3.892021306
1967,-0.955084746,2.653670074,1.18559322,3.434288676
1968,1.249892102,3.078972672,2.025463962,3.333128782
1969,6.067965189,4.059000762,3.7973477,3.682743101
1970,7.695670103,4.374489897,6.454845361,3.804893507
1971,4.060930424,3.518136373,4.050226431,3.213088339
1972,0.116968699,2.100475656,0.448105437,2.143014149
1973,1.170322581,1.117539108,2.077849462,1.223774199
1974,-3.480903491,0.993843373,-3.362628337,0.743772028
1975,8.122440622,1.404815299,7.220720721,0.383056502
1976,-4.154660155,2.337120697,-4.98982499,0.27311304
1977,2.587060703,3.985038574,-2.614217252,0.991155982
1978,9.871190573,5.76100485,5.848435595,2.360425129
1979,10.10028653,6.234471595,6.709373721,3.093667224
1980,5.881410256,5.130650256,3.016025641,2.729391786
1981,-2.017911585,3.831127147,-3.219893293,2.433011756
1982,4.994895956,3.339498879,3.399685905,2.959630239
1983,2.959848485,3.379726024,6.920833333,3.440588075
1984,5.539961759,2.875421386,6.778967495,2.523796836
1985,4.884234577,1.434473709,-1.22658035,0.414780026
1986,-7.194716981,-0.084237705,-6.590566038,-1.292087609
1987,-0.672644029,-0.773107585,-1.901182755,-1.683298485
1988,2.102564103,-0.993161608,1.650075415,-1.503571111
1989,-0.132588454,-1.605719817,-0.754934823,-1.711885186
1990,-6.257666417,-2.303692421,-5.21091997,-2.131227039
1991,-2.756726871,-2.120669855,-1.656468854,-1.991097065
1992,-3.569362018,-0.918864106,-4.043397626,-1.049307985
1993,5.829005935,0.28828617,4.25,0.153919044
1994,1.14195231,0.649705171,-0.226527571,1.1047674
1995,-2.536182977,0.344136251,1.419572553,1.646803195
1996,1.693931398,-0.150934743,3.89596683,1.662078121
1997,0.208255159,-0.848949432,2.128330206,0.959523147
1998,-1.87406577,-1.821658219,-1.252615845,-0.275818404
1999,-4.168425019,-2.321056136,-1.395629239,-1.292493724
2000,-7.355854127,-1.63459516,-5.751247601,-1.40538098
2001,6.195734958,-0.294939587,1.051408987,-0.719406745
2002,0.435692542,0.506032322,2.146499239,-0.094786217
2003,0.652603573,0.223241773,0.18282022,-0.202015491
2004,0.225124856,-0.68490054,-1.643104111,-0.831769121
2005,-2.589540412,-1.486170935,-0.909667195,-1.384971165
2006,-4.970381917,-1.365076042,-3.740452065,-1.271948326
2007,-1.428796844,-0.081287557,-2.8382643,-0.257260182
2008,6.593482688,1.427488131,5.691649695,0.991696668
2009,0.382825719,2.222913105,1.239847716,1.58162602
2010,4.003597122,1.978307383,1.924860112,1.077104403
2011,4.690743047,1.150618167,4.277293483,-0.056958002
2012,-9.753740915,0.768171336,-11.88713125,-0.67505325
2013,6.078736655,1.055718167,4.46975089,-0.477254661
2014,5.75212528,0.857737632,4.197762864,-0.551088302
2015,-0.929824561,-0.740504223,-2.877654663,-1.796884179
2016,-5.223260159,-2.516364846,-5.138720224,-3.170254992
2017,-9.911332385,-2.697826473,-8.885253675,-3.120802775
2018,2.868804665,-1.423116681,0.721574344,-1.706837319
2019,3.308684864,-0.191202018,2.953349876,-0.182286754
2020,-1.831386491,0.180289868,-0.152361605,0.569922128
2021,-0.677749361,0.19875749,0.007672634,0.722395202
2022,1.668776371,0.319903381,2.751582278,0.655281172
2023,0.020255864,0.430238378,-1.404584222,0.5380444