More On The Fake NOAA Late Winter Trend

I did some more research on my theory that the NOAA later winters hockey stick since 1990 is due to missing data. In the first graph below I plotted the number of valid days per month for the 100 stations with the fastest trend towards a later winter. As I expected, these stations have dropped from thirty days of valid temperatures per month in 1990, to six days per month now.

This confirms my suspicion that the apparent trend towards later winter since 1990 is largely due to data loss. If a station is missing temperature readings in October and November, that will cause the average date of the first freeze to come later.

Stations used in this analysis :

FREMONT 5 NWORUSUSC00353095
WEST YELLOWSTONEMTUSUSC00248857
FORKS 4 NNEMTUSUSC00243089
FORTINE 1 NMTUSUSC00243139
WELLSBURG WTR TRMT PLWVUSUSC00469368
FRANKLINNEUSUSC00253035
KALAMAZOO STATE HOSPITALMIUSUSC00204244
CHELSEAVTUSUSC00431360
COLLBRANCOUSUSC00051741
GREENVILLE 2 NEPAUSUSC00363526
WAHPETON 3 NNDUSUSC00329100
CORTLANDNYUSUSC00301799
HETTINGERNDUSUSC00324178
JOHNSTOWNPAUSUSC00364385
CORINNEUTUSUSC00421731
LAKE SPAULDINGCAUSUSC00044713
BROCKPORTNYUSUSC00300937
PALMERTONPAUSUSC00366689
ASHLAND EXP FARMWIUSUSC00470349
WOODSTOCKMDUSUSC00189750
LOCKPORT 4ENYUSUSC00304844
FAYETTE 4 SWMIUSUSC00202737
KLAMATH FALLS 2 SSWORUSUSC00354506
CAMBRIDGE WATER TRMT PMDUSUSC00181385
DELAWAREOHUSUSC00332119
CAMBRIDGE CITY 3 NINUSUSC00121229
ROSEAUMNUSUSC00217087
GRAFTONNDUSUSC00323594
FREDERICKSBURG NPVAUSUSC00443192
MILLINGTON 1 SEMDUSUSC00185985
OWINGS FERRY LANDINGMDUSUSC00186770
WHEATFIELDINUSUSC00129511
LUSK 2 SWWYUSUSC00485830
MUNISINGMIUSUSC00205690
HERMISTON 1 SEORUSUSC00353847
MILFORD 2 SEDEUSUSC00075915
STEAMBOAT SPRINGSCOUSUSC00057936
MEDICINE LODGEKSUSUSC00145173
COLVILLEWAUSUSC00451630
HEBERUTUSUSC00423809
LEWISTONMEUSUSC00174566
THOMPSONUTUSUSC00428705
QUINCYCAUSUSC00047195
HOBART 2 WNWINUSUSC00124008
SHELBYVILLE 1 EKYUSUSC00157324
TAUNTONMAUSUSC00198367
GLOVERSVILLENYUSUSC00303319
FOSSTON 1 EMNUSUSC00212916
MOTTNDUSUSC00326155
VACAVILLECAUSUSC00049200
PLAIN DEALINGLAUSUSC00167344
GOLDENDALEWAUSUSC00453222
DARLINGTONWIUSUSC00472001
TELLURIDE 4WNWCOUSUSC00058204
FRANKFORT DOWNTOWNKYUSUSC00153028
KENTONOKUSUSC00344766
COEUR D’ALENEIDUSUSC00101956
MERRIMANNEUSUSC00255470
TUCSON WFOAZUSUSC00028815
MILLINOCKETMEUSUSC00175304
LAKEVIEW 2 NNWORUSUSC00354670
MORRISVILLE 6 SWNYUSUSC00305512
MCLEANSBOROILUSUSC00115515
CONCONULLYWAUSUSC00451666
PORT TOWNSENDWAUSUSC00456678
MILBANK 4 NWSDUSUSC00395536
DAHLONEGA 4WSWGAUSUSC00092475
LAWTONOKUSUSC00345063
GOLDSBORO 4 SENCUSUSW00013713
SAINT PAULNEUSUSC00257515
GOLCONDANVUSUSC00263245
BAUDETTEMNUSUSC00210515
SANTA ROSACAUSUSC00047965
MORGAN POWER & LIGHTUTUSUSC00425826
PARKERAZUSUSC00026250
LISBONNDUSUSC00325220
RED RIVERNMUSUSC00297323
BOONTON 1 SENJUSUSC00280907
PAROWANUTUSUSC00426686
SNAKE CREEK POWERHOUSEUTUSUSC00427909
PANGUITCHUTUSUSC00426601
UNIONVILLEMOUSUSC00238523
SNOQUALMIE FALLSWAUSUSC00457773
DILLON 1 ECOUSUSC00052281
WANAKENA RNGR SCHOOLNYUSUSC00308944
HILLSBORO 3 NNDUSUSC00324203
MILLEN 4 NGAUSUSC00095882
HEALDSBURGCAUSUSC00043875
WILLIAMSTOWNKYUSUSC00158714
MORAN 5WNWWYUSUSC00486440
SACATONAZUSUSC00027370
UKIAHCAUSUSC00049122
TUSTIN IRVINE RCHCAUSUSC00049087
LAKETOWNUTUSUSC00424856
DICKINSON EXP STNNDUSUSC00322188
BENDORUSUSC00350694
NORTH LOUPNEUSUSC00256040
CLARKSDUSUSC00391739
GAGENMUSUSC00293368
ELECTRA P HCAUSUSC00042728

 

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