195003,0.257
195004,-0.073
195005,0.027
195006,-0.637
195007,-0.457
195008,-0.353
195009,0.350
195010,-0.053
195011,-0.477
195012,-0.733
195101,-0.080
195102,-0.080
195103,-0.180
195104,-0.610
195105,-0.817
195106,-0.287
195107,-0.163
195108,-0.070
195109,0.097
195110,0.040
195111,0.933
195112,0.620
195201,0.473
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195203,-0.437
195204,-0.533
195205,-0.170
195206,-0.537
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195211,-0.763
195212,-0.410
195301,-0.197
195302,-0.067
195303,-0.733
195304,-0.790
195305,-0.413
195306,0.277
195307,0.260
195308,-0.220
195309,0.087
195310,0.670
195311,0.630
195312,0.313
195401,0.213
195402,0.093
195403,0.417
195404,0.140
195405,0.333
195406,-0.313
195407,-0.917
195408,-0.980
195409,-0.580
195410,0.187
195411,0.563
195412,-0.250
195501,-0.757
195502,-1.163
195503,-0.690
195504,-0.430
195505,-0.620
195506,0.107
195507,0.577
195508,1.050
195509,-0.027
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195511,-0.863
195512,-0.447
195601,-0.390
195602,-0.463
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195604,0.367
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195611,0.497
195612,0.553
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195705,-0.340
195706,-0.900
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195711,0.723
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195801,-0.493
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195803,-0.883
195804,-0.610
195805,-0.417
195806,-1.117
195807,-1.557
195808,-1.120
195809,-0.490
195810,0.577
195811,0.367
195812,0.023
195901,-0.297
195902,-0.113
195903,0.297
195904,0.200
195905,0.383
195906,0.510
195907,0.400
195908,0.560
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195910,0.727
195911,0.580
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196001,-0.913
196002,-1.227
196003,-0.343
196004,0.437
196005,0.533
196006,0.197
196007,-0.420
196008,-0.220
196009,-0.913
196010,-0.617
196011,-0.727
196012,-0.013
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196102,0.470
196103,-0.183
196104,-0.453
196105,-0.350
196106,0.037
196107,0.457
196108,0.583
196109,0.883
196110,0.377
196111,-0.530
196112,-0.497
196201,-0.107
196202,-0.437
196203,-0.310
196204,-0.527
196205,0.350
196206,-0.803
196207,-0.723
196208,-0.900
196209,0.060
196210,-0.063
196211,-0.380
196212,-1.223
196301,-1.467
196302,-1.170
196303,-0.913
196304,0.127
196305,0.127
196306,0.320
196307,-0.613
196308,0.127
196309,0.697
196310,0.487
196311,-0.750
196312,-1.380
196401,-1.433
196402,-1.193
196403,-0.757
196404,-0.107
196405,0.723
196406,1.237
196407,0.473
196408,0.110
196409,-0.277
196410,0.310
196411,0.193
196412,-0.093
196501,-0.607
196502,-1.060
196503,-0.780
196504,-0.470
196505,0.130
196506,-0.003
196507,0.353
196508,0.380
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196510,-0.303
196511,0.030
196512,-0.677
196601,-0.587
196602,-0.857
196603,-0.527
196604,0.010
196605,0.173
196606,0.530
196607,-0.130
196608,-0.630
196609,-0.963
196610,-0.390
196611,0.000
196612,-0.070
196701,0.007
196702,0.270
196703,0.627
196704,0.233
196705,0.197
196706,0.273
196707,1.083
196708,0.927
196709,0.813
196710,0.533
196711,0.073
196712,0.093
196801,-0.537
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196803,-0.657
196804,-0.813
196805,-0.837
196806,-0.743
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196811,-1.543
196812,-1.053
196901,-1.260
196902,-1.313
196903,-0.527
196904,0.173
196905,0.877
196906,0.557
196907,-0.110
196908,0.397
196909,0.427
196910,0.590
196911,-0.193
196912,-0.913
197001,-0.380
197002,-0.607
197003,-0.540
197004,-0.373
197005,0.463
197006,0.930
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197008,0.037
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197011,-0.907
197012,-0.977
197101,-0.697
197102,-0.577
197103,-0.280
197104,-0.193
197105,-0.437
197106,-0.277
197107,0.073
197108,0.727
197109,0.840
197110,0.257
197111,0.327
197112,0.223
197201,0.397
197202,0.437
197203,0.273
197204,0.483
197205,0.537
197206,0.670
197207,0.793
197208,0.460
197209,0.763
197210,0.503
197211,0.607
197212,0.257
197301,0.360
197302,0.397
197303,0.203
197304,-0.227
197305,-0.197
197306,0.173
197307,0.300
197308,0.070
197309,-0.533
197310,-0.823
197311,-0.617
197312,0.243
197401,0.507
197402,0.390
197403,0.113
197404,0.080
197405,0.043
197406,-0.380
197407,-0.513
197408,-0.193
197409,0.223
197410,0.257
197411,0.483
197412,0.513
197501,0.487
197502,-0.217
197503,-0.943
197504,-0.910
197505,-0.987
197506,0.063
197507,0.150
197508,0.950
197509,0.253
197510,0.477
197511,-0.043
197512,0.053
197601,0.227
197602,0.477
197603,0.647
197604,0.657
197605,0.673
197606,0.480
197607,0.800
197608,0.103
197609,0.183
197610,-0.400
197611,-0.503
197612,-0.823
197701,-1.043
197702,-0.780
197703,-0.217
197704,-0.340
197705,-0.260
197706,-0.627
197707,-0.433
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197709,0.203
197710,0.273
197711,-0.183
197712,-0.137
197801,-0.847
197802,-0.280
197803,-0.890
197804,0.203
197805,0.430
197806,0.440
197807,0.293
197808,-0.013
197809,1.010
197810,1.810
197811,1.133
197812,0.030
197901,-1.207
197902,-0.423
197903,-0.533
197904,-0.653
197905,-0.380
197906,0.467
197907,1.130
197908,0.933
197909,0.557
197910,0.413
197911,0.410
197912,0.260
198001,0.100
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198003,0.343
198004,-0.173
198005,-0.193
198006,-0.763
198007,-1.010
198008,-0.667
198009,-1.117
198010,-0.493
198011,-0.453
198012,0.260
198101,0.690
198102,0.033
198103,0.030
198104,-0.210
198105,0.037
198106,-0.067
198107,-0.003
198108,-0.337
198109,-0.803
198110,-1.060
198111,-0.583
198112,-0.430
198201,0.080
198202,0.470
198203,0.800
198204,0.240
198205,-0.687
198206,-0.337
198207,-0.073
198208,1.057
198209,0.427
198210,0.873
198211,0.880
198212,1.657
198301,0.947
198302,0.670
198303,-0.143
198304,0.010
198305,0.023
198306,0.703
198307,1.263
198308,0.560
198309,0.380
198310,-0.483
198311,-0.013
198312,0.323
198401,0.890
198402,0.670
198403,0.023
198404,-0.037
198405,-0.053
198406,0.017
198407,0.220
198408,0.417
198409,0.417
198410,0.013
198411,-0.043
198412,-0.557
198501,-0.700
198502,-0.633
198503,0.010
198504,0.010
198505,-0.323
198506,-0.023
198507,-0.020
198508,0.073
198509,-0.033
198510,-0.097
198511,0.150
198512,0.220
198601,0.110
198602,0.607
198603,0.040
198604,0.657
198605,0.493
198606,0.730
198607,0.083
198608,-0.697
198609,-0.220
198610,0.907
198611,1.610
198612,0.710
198701,-0.297
198702,-0.580
198703,0.470
198704,1.040
198705,0.387
198706,-0.107
198707,-0.710
198708,-0.510
198709,-0.637
198710,-0.300
198711,0.213
198712,0.507
198801,0.700
198802,0.537
198803,-0.193
198804,-0.237
198805,0.113
198806,0.387
198807,0.190
198808,-0.433
198809,-0.677
198810,-0.803
198811,-0.270
198812,0.480
198901,1.260
198902,1.673
198903,1.377
198904,1.170
198905,0.463
198906,0.693
198907,0.237
198908,1.010
198909,0.677
198910,0.727
198911,-0.340
198912,0.017
199001,0.433
199002,1.303
199003,1.623
199004,0.643
199005,0.150
199006,-0.340
199007,0.493
199008,0.853
199009,0.753
199010,0.350
199011,0.070
199012,0.280
199101,0.707
199102,0.567
199103,0.377
199104,0.057
199105,-0.150
199106,-0.410
199107,-0.027
199108,0.407
199109,0.507
199110,0.257
199111,0.250
199112,0.270
199201,0.467
199202,0.603
199203,1.267
199204,1.787
199205,1.563
199206,0.997
199207,0.403
199208,0.190
199209,-0.450
199210,-0.337
199211,-0.033
199212,1.087
199301,0.857
199302,0.923
199303,0.713
199304,0.287
199305,-0.133
199306,-1.517
199307,-1.217
199308,-1.210
199309,-0.387
199310,0.427
199311,1.137
199312,1.720
199401,1.020
199402,0.920
199403,0.953
199404,0.610
199405,0.697
199406,0.753
199407,1.070
199408,0.123
199409,-0.637
199410,-0.550
199411,0.563
199412,1.197
199501,1.363
199502,1.107
199503,0.513
199504,-0.363
199505,-0.737
199506,-0.527
199507,0.200
199508,0.260
199509,0.397
199510,-0.293
199511,-0.953
199512,-1.057
199601,-0.620
199602,-0.143
199603,-0.160
199604,-0.490
199605,-0.223
199606,0.057
199607,0.750
199608,0.277
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199610,-0.583
199611,-0.767
199612,-0.820
199701,-0.067
199702,0.890
199703,0.713
199704,0.053
199705,-0.923
199706,-0.470
199707,-0.100
199708,0.593
199709,-0.087
199710,-0.663
199711,-1.187
199712,-0.490
199801,-0.227
199802,0.383
199803,0.027
199804,-0.377
199805,-1.573
199806,-1.507
199807,-1.073
199808,-0.833
199809,-0.770
199810,-0.857
199811,0.100
199812,0.453
199901,0.643
199902,0.430
199903,-0.143
199904,0.067
199905,0.363
199906,0.380
199907,0.203
199908,-0.050
199909,0.317
199910,0.403
199911,0.820
199912,0.953
200001,1.303
200002,1.023
200003,0.813
200004,0.773
200005,0.507
200006,0.173
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200008,-0.510
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200010,-0.070
200011,-0.193
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200101,0.040
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200104,-0.427
200105,-0.073
200106,-0.157
200107,-0.173
200108,-0.323
200109,-0.320
200110,-0.087
200111,-0.147
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200201,0.237
200202,0.743
200203,0.990
200204,0.550
200205,0.447
200206,0.260
200207,0.460
200208,0.100
200209,-0.867
200210,-1.053
200211,-1.133
200212,-0.320
200301,-0.053
200302,0.367
200303,0.253
200304,0.050
200305,-0.080
200306,0.023
200307,-0.003
200308,0.023
200309,-0.440
200310,-0.130
200311,0.080
200312,0.403
200401,0.070
200402,0.197
200403,0.677
200404,0.787
200405,0.150
200406,0.143
200407,-0.080
200408,0.343
200409,-0.400
200410,0.003
200411,0.280
200412,1.153
200501,0.890
200502,-0.123
200503,-0.730
200504,-1.127
200505,-0.533
200506,-0.603
200507,-0.063
200508,0.163
200509,0.007
200510,-0.220
200511,-0.577
200512,0.173
200601,0.107
200602,-0.173
200603,-0.183
200604,-0.393
200605,0.313
200606,0.200
200607,0.003
200608,-0.817
200609,-1.863
200610,-1.140
200611,-0.153
200612,0.667
200701,0.363
200702,0.397
200703,0.380
200704,0.757
200705,-0.160
200706,-0.410
200707,-0.677
200708,0.000
200709,0.343
200710,0.583
200711,0.457
200712,0.603
200801,0.653
200802,0.567
200803,-0.087
200804,-0.907
200805,-1.397
200806,-1.463
200807,-1.273
200808,-0.470
200809,-0.060
200810,0.220
200811,-0.213
200812,-0.203
200901,-0.077
200902,0.207
200903,0.143
200904,0.683
200905,0.090
200906,-0.560
200907,-1.183
200908,-0.277
200909,0.097
200910,0.153
200911,-0.993
200912,-1.020
201001,-1.673
201002,-1.323
201003,-1.193
201004,-1.030
201005,-1.010
201006,-0.910
201007,-0.820
201008,-0.810
201009,-0.980
201010,-1.113
201011,-1.467
201012,-1.450
201101,-0.677
201102,0.143
201103,1.263
201104,1.010
201105,0.380
201106,-0.950
201107,-1.380
201108,-0.773
201109,-0.140
201110,0.763
201111,1.423
201112,1.683
201201,1.370
201202,0.953
201203,0.720
201204,0.277
201205,-0.990
201206,-1.587
201207,-1.610
201208,-0.963
201209,-1.210
201210,-1.077
201211,-0.823
201212,-0.020
201301,0.023
201302,-0.570
201303,-0.457
201304,-0.117
201305,0.593
201306,0.587
201307,0.720
201308,0.627
201309,-0.023
201310,-0.047
201311,0.190
201312,0.713
201401,0.860
201402,0.810
201403,0.817
201404,0.063
201405,-0.527
201406,-0.570
201407,-0.823
201408,0.040
201409,-0.443
201410,0.343
201411,0.423
201412,1.443
201501,0.849
201502,1.320
201503,0.937
201504,0.650
201505,0.357
201506,-0.903
201507,-1.333
201508,-1.577
201509,-0.200
201510,0.733
201511,1.560
201512,1.107
201601,0.990
201602,0.450
201603,0.660
201604,-0.013
201605,-0.180
201606,-0.840
201607,-1.363
201608,-1.073
201609,-0.180
201610,0.463
201611,0.333
201612,0.030
201701,0.363
201702,0.370
201703,0.933
201704,0.130
201705,0.123
201706,-0.030
201707,0.033
201708,-0.233
201709,-0.423
201710,0.040
201711,0.433
201712,0.587
201801,1.080
201802,0.377
201803,0.387
201804,0.613
201805,1.543
201806,1.617
201807,1.743
201808,1.867
201809,1.903
201810,1.020
201811,0.587
201812,0.137
201901,0.183
201902,0.320
201903,0.380
201904,-0.377
201905,-0.937
201906,-1.520
201907,-1.267
201908,-1.007
201909,-0.887
201910,-0.293
201911,0.050
201912,0.743
202001,1.017
202002,0.897
202003,0.127
202004,-0.310
202005,-0.477
202006,-0.453
202007,-0.333
202008,-0.017
202009,0.313
202010,1.150
202011,0.657
Monthly values of the North Atlantic Oscillation (NAO), which compares the relative strength of semi-permanent high and low pressure patterns in the North Atlantic Ocean. When the NAO is positive, pressure patterns favor mild winters in the U.S. East. When the NAO is negative, pressure patterns favor stronger cold-air outbreaks and increased storminess in the eastern U.S.
Late winter temperatures compared to the 1981-2010 average when the North Atlantic Oscillation (NAO) was strongly negative (top, Jan-March 2010) and when it was strongly positive (bottom, January-March 1990). Winters are often cooler than average across the mid-latitudes when the NAO is negative, and warmer than average when it is positive.
Monthly average of the North Atlantic Oscillation (NAO), which compares the relative strength of semi-permanent high and low pressure patterns in the North Atlantic Ocean. A positive NAO index favors mild winters in the U.S. East. Negative values favor stronger cold-air outbreaks and increased storminess in the eastern U.S. NOAA Climate.gov image, based on data from the Climate Prediction Center.
Late winter temperatures compared to the 1981-2010 average when the North Atlantic Oscillation (NAO) was strongly negative (top, Jan-March 2010) and when it was strongly positive (bottom, January-March 1990). Winters are often cooler than average across the mid-latitudes when the NAO is negative, and warmer than average when it is positive. NOAA Climate.gov image, based on data from the Physical Sciences Lab.