2001 Hartford, Connecticut (BDL)

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2001 HARTFORD, CONNECTICUT (BDL)

Bradley International Airport is located about 3 miles west of the Connecticut River on a slight rise of ground in a broad portion of the Connecticut River Valley between north–south mountain ranges whose heights do not exceed 1,200 feet.

The station is in the northern temperate climate zone. The prevailing west to east movement of air brings the majority of weather systems into Connecticut from the west. The average wintertime position of the Polar Front boundary between cold, dry polar air and warm, moist tropical air is just south of New England, which helps to explain the extensive winter storm activity and day to day variability of local weather. In summer, the Polar Front has an average position along the New England–Canada border with this station in a warm and pleasant atmosphere.

The location of Hartford, relative to continent and ocean, is also significant. Rapid weather changes result when storms move northward along the mid–Atlantic coast, frequently producing strong and persistent northeast winds associated with storms known locally as coastals or northeasters. Seasonally, weather characteristics vary from the cold and dry continental–polar air of winter to the warm and humid maritime air of summer.

Summer thunderstorms develop in the Berkshire Mountains to the west and northwest, move over the Connecticut Valley, and when accompanied by wind and hail, sometimes cause considerable damage to crops, particularly tobacco. During the winter, rain often falls through cold air trapped in the valley, creating extremely hazardous ice conditions. On clear nights in the late summer or early autumn, cool air drainage into the valley, and moisture from the Connecticut River, produce steam and/or ground fog which becomes quite dense throughout the valley, hampering ground and air transportation.

The mean date of the last springtime temperature of 32 degrees or lower is April 22, and the mean date of the first autumn temperature of 32 degrees is October 15.

NORMALS, MEANS, AND EXTREMES

HARTFORD, CT (BDL)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14740

41 56′ 17″ N  72 40′ 57″ W  GRND: 162  BARO: 165  EASTERN (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3033.236.446.859.971.680.085.082.774.863.751.037.560.2
MEAN DAILY MAXIMUM5334.237.346.359.771.480.083.082.474.363.950.938.560.2
HIGHEST DAILY MAXIMUM47657389969910010210299918176102
YEAR OF OCCURRENCE196719851998197619961964196620011983196319741998AUG 2001
MEAN OF EXTREME MAXS.5353.755.168.380.889.093.693.993.889.280.970.058.777.3
NORMAL DAILY MINIMUM3015.818.628.137.547.656.962.260.451.840.732.821.339.5
MEAN DAILY MINIMUM5317.319.727.837.647.556.860.960.351.741.032.621.939.6
LOWEST DAILY MINIMUM47-26-21-692837443630171-14-26
YEAR OF OCCURRENCE196119611967197020011986196219652000197819891980JAN 1961
MEAN OF EXTREME MINS.53-2.8-.310.824.834.143.649.447.135.626.017.43.124.1
NORMAL DRY BULB3024.627.537.548.759.668.573.771.663.352.241.929.549.9
MEAN DRY BULB5325.628.536.948.759.468.572.171.463.252.441.730.149.9
MEAN WET BULB1624.226.232.642.352.661.261.761.057.647.235.326.944.1
MEAN DEW POINT1616.917.923.733.445.856.157.557.253.441.729.220.137.7
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.31.13.68.04.81.3*0.00.019.1
MAXIMUM 323014.19.41.60.10.00.00.00.00.00.00.59.535.2
MINIMUM 323028.825.421.48.50.80.00.00.00.36.416.626.9135.1
MINIMUM 0303.21.7*0.00.00.00.00.00.00.00.01.16.0
H/CNORMAL HEATING DEG. DAYS301252105085348919420069639769311016151
NORMAL COOLING DEG. DAYS3000002712527021045000677
RHNORMAL (PERCENT)3064636058636768717369686866
HOUR 01 LST3069686868768082848580757376
HOUR 07 LST3071727169737778828683787576
HOUR 13 LST3056545045475151535451565952
HOUR 19 LST3062605652566061657067666662
SPERCENT POSSIBLE SUNSHINE4253565755576062625957454756
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)472.52.42.31.41.72.22.02.32.83.22.22.727.7
THUNDERSTORMS470.10.20.71.22.53.94.33.72.11.00.40.120.2
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)425.25.25.45.45.45.35.14.94.84.65.45.25.2
MIDNIGHT-MIDNIGHT (OKTAS)325.04.95.15.05.15.04.84.74.64.35.05.04.9
MEAN NO. DAYS WITH:
CLEAR427.76.66.76.35.65.75.76.98.49.45.76.981.6
PARTLY CLOUDY427.87.78.48.59.710.312.110.88.98.58.27.5108.4
CLOUDY4215.513.916.015.215.714.013.213.312.713.016.116.6175.2
PRMEAN STATION PRESSURE (IN)1329.8229.8329.7829.7929.7929.7929.8129.8129.8529.9029.8929.8729.83
MEAN SEA-LEVEL PRES. (IN)1730.0630.0530.0129.9629.9629.9329.9830.0130.0530.0930.0730.0730.02
WINDSMEAN SPEED (MPH)418.99.510.19.98.88.17.37.07.47.88.58.68.5
PREVAIL. DIR (TENS OF DEGS)2731313218181818181818363618
MAXIMUM 2-MINUTE:
SPEED (MPH)546384341394539343838364146
DIR. (TENS OF DEGS)24303020283627280229152624
YEAR OF OCCURRENCE199920011997200019982000199919971999199819992000JAN 1999
MAXIMUM 5-SECOND:
SPEED (MPH)556545453615260414646545561
DIR. (TENS OF DEGS)24292920313427283128242531
YEAR OF OCCURRENCE199920011997200019982000199919971999199819982000MAY 1998
PRECIPITATIONNORMAL (IN)303.413.233.633.854.123.753.193.653.793.574.043.9144.14
MAXIMUM MONTHLY (IN)479.617.276.869.9012.0013.608.4321.8711.2211.618.538.3621.87
YEAR OF OCCURRENCE197819811983198319891982198819551999195519721969AUG 1955
MINIMUM MONTHLY (IN)470.380.450.271.100.730.670.970.540.840.350.510.780.27
YEAR OF OCCURRENCE198119871981199919591988200119811986196319761955MAR 1981
MAXIMUM IN 24 HOURS (IN)472.562.162.623.014.906.143.4812.125.724.452.903.1212.12
YEAR OF OCCURRENCE197919651987197919891982196019551999195919881973AUG 1955
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013010.710.111.210.711.811.59.49.69.38.211.212.3126.0
PRECIPITATION 1.00300.70.90.91.01.10.90.71.11.21.01.01.211.7
SNOWFALLNORMAL (IN)3012.812.27.71.30.*0.00.00.00.00.12.311.047.4
MAXIMUM MONTHLY (IN)4342.832.243.314.31.3T0.00.00.01.78.735.443.3
YEAR OF OCCURRENCE199619691956198219771993197919861969MAR 1956
MAXIMUM IN 24 HOURS (IN)4314.921.014.814.11.3T0.00.00.01.78.613.921.0
YEAR OF OCCURRENCE199619831993198219771993197919801969FEB 1983
MAXIMUM SNOW DEPTH (IN)482529201400000181629
YEAR OF OCCURRENCE1961196119561982197919711969FEB 1961
NORMAL NO. DAYS WITH:
SNOWFALL 1.0303.02.62.00.40.*0.00.00.00.00.*0.63.412.0
PRECIPITATION (inches) 2001 HARTFORD, CT (BDL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19722.025.126.714.617.499.663.843.451.844.208.537.0864.55
19733.283.053.226.595.955.071.774.503.733.472.148.3151.08
19744.101.954.493.643.032.382.393.368.572.342.624.5243.39
19754.303.223.822.993.293.836.114.609.025.284.574.3155.34
19765.573.112.863.934.452.863.515.762.554.100.512.9742.18
19772.412.816.574.893.703.993.372.448.175.454.385.6853.86
19789.611.423.631.514.612.942.513.612.671.752.124.2340.61
19799.122.834.255.883.480.911.974.442.954.763.462.5746.62
19800.720.985.875.391.653.812.651.601.402.584.220.8231.69
19810.387.270.272.922.171.374.210.544.495.192.344.0035.15
19824.762.832.234.123.3013.602.604.412.413.313.121.3248.01
19834.683.836.869.904.822.611.072.552.105.526.095.9756.00
19841.804.723.934.2411.552.164.221.321.202.762.492.4642.85
19850.731.722.161.542.773.554.556.443.832.276.041.2836.88
19865.343.022.721.552.286.794.443.440.842.185.576.1544.32
19876.200.454.445.232.183.662.274.257.193.673.661.5744.77
19883.363.992.062.353.460.678.432.121.882.297.841.3539.80
19890.881.853.023.3312.006.653.406.814.677.622.891.4954.61
19904.033.372.464.556.383.592.098.322.137.633.764.8653.17
19912.451.784.523.545.182.372.908.695.673.174.032.9647.26
19922.732.233.793.133.215.774.623.602.431.954.194.3341.98
19932.632.906.674.711.922.634.901.805.354.153.274.1645.09
19945.833.385.702.514.123.845.325.335.471.534.575.3852.98
19953.843.241.892.602.631.022.583.813.159.464.382.3240.92
19966.992.862.456.292.982.396.971.677.535.254.145.6955.21
19973.151.383.602.433.371.903.927.330.971.655.872.1837.75
19983.373.124.873.357.847.182.231.982.335.672.340.8345.11
19995.263.504.281.103.230.722.592.6611.223.543.542.4744.11
20002.832.243.694.214.456.745.483.333.881.070.953.3042.17
20011.352.906.131.224.715.120.973.713.100.760.862.2033.03
POR=50 YRS3.533.133.793.683.753.653.433.883.673.153.693.6342.98
AVERAGE TEMPERATURE (F) 2001 HARTFORD, CT (BDL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197227.926.034.644.360.165.973.871.164.348.938.730.848.9
197329.427.243.350.458.071.875.076.464.754.743.632.952.3
197428.227.036.850.756.667.373.772.763.347.340.730.749.6
197531.229.735.945.864.668.376.171.861.755.748.228.551.5
197619.534.840.353.358.472.772.471.062.449.938.324.849.8
197718.727.642.951.263.668.074.572.864.052.044.428.050.6
197823.622.135.148.159.969.271.970.058.649.038.629.348.0
197926.618.041.249.064.169.074.670.861.650.745.533.650.4
198027.624.335.249.261.066.474.273.264.950.337.924.649.1
198117.835.338.152.061.669.674.870.662.549.343.731.050.5
198218.829.236.745.861.465.074.469.563.051.545.836.049.8
198327.129.139.248.956.869.974.972.766.552.542.728.150.7
198421.834.331.448.056.069.871.873.259.855.241.535.749.9
198521.529.939.750.760.663.772.470.263.451.943.227.549.6
198627.426.238.751.061.766.072.369.561.851.438.333.149.8
198725.026.739.849.760.868.874.269.062.949.241.433.250.1
198823.128.338.547.459.766.775.274.562.247.642.329.349.6
198930.828.637.446.560.468.372.671.463.953.440.918.149.4
199034.733.040.249.256.769.074.473.364.057.444.536.752.8
199127.033.940.553.365.870.573.773.162.155.142.732.852.5
199228.630.334.646.458.566.469.969.162.649.240.631.249.0
199328.854.334.549.661.268.674.373.463.049.840.830.952.4
199418.823.236.150.958.371.177.170.063.752.646.135.050.2
199532.425.841.146.858.069.376.572.162.255.838.127.150.4
199625.127.734.349.658.369.371.271.962.951.138.135.849.6
199727.134.736.247.256.168.772.370.163.250.638.831.449.7
199832.636.240.349.962.967.072.973.665.752.641.636.852.7
199925.931.838.549.259.971.076.571.366.051.146.334.651.8
200024.031.043.747.859.667.769.669.662.151.840.925.449.4
200125.428.434.349.759.569.669.775.263.453.545.936.951.0
POR=97 YRS26.728.037.248.259.267.972.471.063.552.942.130.750.0

REFERENCE NOTES:

PAGE 1:

THE TEMPERATURE GRAPH SHOWS NORMAL MAXIMUM AND NORMAL MINIMUM DAILY TEMPERATURES (SOLID CURVES) AND THE ACTUAL DAILY HIGH AND LOW TEMPERATURES (VERTICAL BARS).

PAGE 2 AND 3:

H/C INDICATES HEATING AND COOLING DEGREE DAYS.

RH INDICATES RELATIVE HUMIDITY

W/O INDICATES WEATHER AND OBSTRUCTIONS

S INDICATES SUNSHINE.

PR INDICATES PRESSURE.

CLOUDINESS ON PAGE 3 IS THE SUM OF THE CEILOMETER AND SATELLITE DATA NOT TO EXCEED EIGHT EIGHTHS (OKTAS).

GENERAL:

T INDICATES TRACE PRECIPITATION, AN AMOUNT GREATER THAN ZERO BUT LESS THAN THE LOWEST REPORTABLE VALUE.

+ INDICATES THE VALUE ALSO OCCURS ON EARLIER DATES.

BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA.

NORMALS ARE 30–YEAR AVERAGES (1961–1990).

ASOS INDICATES AUTOMATED SURFACE OBSERVING SYSTEM.

PM INDICATES THE LAST DAY OF THE PREVIOUS MONTH.

POR (PERIOD OF RECORD) BEGINS WITH THE JANUARY DATA MONTH AND IS THE NUMBER OF YEARS USED TO COMPUTE THE MEAN. INDIVIDUAL MONTHS WITHIN THE POR MAY BE MISSING.

WHEN THE POR FOR A NORMAL IS LESS THAN 30 YEARS, THE NORMAL IS PROVISIONAL AND IS BASED ON THE NUMBER OF YEARS INDICATED.

0.* OR * INDICATES THE VALUE OR MEAN–DAYS–WITH IS BETWEEN 0.00 AND 0.05.

CLOUDINESS FOR ASOS STATIONS DIFFERS FROM THE NON–ASOS OBSERVATION TAKEN BY A HUMAN OBSERVER. ASOS STATION CLOUDINESS IS BASED ON TIME–AVERAGED CEILOMETER DATA FOR CLOUDS AT OR BELOW 12,000 FEET AND ON SATELLITE DATA FOR CLOUDS ABOVE 12,000 FEET.

THE NUMBER OF DAYS WITH CLEAR, PARTLY CLOUDY, AND CLOUDY CONDITIONS FOR ASOS STATIONS IS THE SUM OF THE CEILOMETER AND SATELLITE DATA FOR THE SUNRISE TO SUNSET PERIOD.

GENERAL CONTINUED:

CLEAR INDICATES 0–2 OKTAS, PARTLY CLOUDY INDICATES 3–6 OKTAS, AND CLOUDY INDICATES 7 OR 8 OKTAS. WHEN AT LEAST ONE OF THE ELEMENTS (CEILOMETER OR SATELLITE) IS MISSING, THE DAILY CLOUDINESS IS NOT COMPUTED.

WIND DIRECTION IS RECORDED IN TENS OF DEGREES (2 DIGITS) CLOCKWISE FROM TRUE NORTH. "00" INDICATES CALM. "36" INDICATES TRUE NORTH.

RESULTANT WIND IS THE VECTOR AVERAGE OF THE SPEED AND DIRECTION.

AVERAGE TEMPERATURE IS THE SUM OF THE MEAN DAILY MAXIMUM AND MINIMUM TEMPERATURE DIVIDED BY 2.

SNOWFALL DATA COMPRISE ALL FORMS OF FROZEN PRECIPITATION, INCLUDING HAIL.

A HEATING (COOLING) DEGREE DAY IS THE DIFFERENCE BETWEEN THE AVERAGE DAILY TEMPERATURE AND 65 F.

DRY BULB IS THE TEMPERATURE OF THE AMBIENT AIR.

DEW POINT IS THE TEMPERATURE TO WHICH THE AIR MUST BE COOLED TO ACHIEVE 100 PERCENT RELATIVE HUMIDITY.

WET BULB IS THE TEMPERATURE THE AIR WOULD HAVE IF THE MOISTURE CONTENT WAS INCREASED TO 100 PERCENT RELATIVE HUMIDITY.

ON JULY 1, 1996, THE NATIONAL WEATHER SERVICE BEGAN USING THE "METAR" OBSERVATION CODE THAT WAS ALREADY EMPLOYED BY MOST OTHER NATIONS OF THE WORLD. THE MOST NOTICEABLE DIFFERENCE IN THIS ANNUAL PUBLICATION WILL BE THE CHANGE IN UNITS FROM TENTHS TO EIGHTS (OKTAS) FOR REPORTING THE AMOUNT OF SKY COVER.

HEATING DEGREE DAYS (base 65 F) 2001 HARTFORD, CT (BDL)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-736982494782105410971051665444229135926
1973-740010232263598811341056868435287375864
1974-752112154272510571040986894567111436089
1975-7601112129250311251403869759391213205707
1976-77016118467794124214291038684419130456382
1977-7818112399610114112761192920500220256404
1978-7991520948979011021184131073047381266418
1979-80163015244257896511511174916466146686104
1980-81009944980812461456824828380149106249
1981-820911548163510481427996871569128646343
1982-831309641657589411701002793483261245745
1983-8407106404662113513328841035503286326386
1984-85331862986988961341975776428167765847
1985-86014119401648115711591081809413174636038
1986-87143213542279398112301065773452191296117
1987-8813110048170098112921057817523186756244
1988-89923112539672110110541012847553175316128
1989-900221033547151444935890763478251215976
1990-91501122766088731170863755373107165158
1991-921015631166399011221002936553218375989
1992-93916138486722104211141148935454139436246
1993-9434142464722104914241163888417226156517
1994-95087737956192310051088737539224135554
1995-9604130283802116912271078944465241196362
1996-97121204248029001167841883526274495989
1997-98361044457771036998801769447101595546
1998-991361378694873120792381546616895598
1999-00011674225559341264978657512210655675
2000-01317154398716122112171023946466202276390
2001-120101361568863
COOLING DEGREE DAYS (base 65 F) 2001 HARTFORD, CT (BDL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720003308328620370100676
19730001119221318362998001038
1974000113411028224777030764
1975000010614734822927760870
1976000471825723620847600819
1977004139314430325988100905
197800007115922817326000657
197900006015132021856600811
1980000031117296263107100815
198100005315231119048000754
19820000227029817645230616
19830005161773132531582300945
198400001118221826538400718
19850003374423418278300581
198600007910324917948700665
198700037015029216142000718
198800002713433132637600861
198900003713624022477000714
1990000131146305263894810866
199100029139191278257761200982
19920000218517015174200503
199300002815529727189000840
199400012520538117343000828
199500001115136323057100813
199600094215520022163000690
19970000516823717258600646
1998001314212725427389000799
1999000017194368210101000890
200000004615415216677100596
20010001140170166322601200781
SNOWFALL (inches) 2001 HARTFORD, CT (BDL)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.42.112.014.15.90.40.30.00.035.2
1973-740.00.00.00.0T3.114.35.84.82.10.00.030.1
1974-750.00.00.0T0.88.510.216.02.50.30.00.038.3
1975-760.00.00.00.00.313.415.65.012.30.00.00.046.6
1976-770.00.00.00.00.47.320.09.111.00.31.30.049.4
1977-780.00.00.00.01.312.637.018.113.3T0.00.082.3
1978-790.00.00.00.04.310.38.69.2T3.60.00.036.0
1979-800.00.00.01.70.00.90.27.75.9T0.00.016.4
1980-810.00.00.00.08.63.94.10.90.20.00.00.017.7
1981-820.00.00.0TT13.116.75.86.514.30.00.056.4
1982-830.00.00.00.0T5.710.229.40.20.90.00.046.4
1983-840.00.00.00.0T7.914.71.319.3T0.00.043.2
1984-850.00.00.00.00.13.86.99.42.11.40.00.023.7
1985-860.00.00.00.02.05.45.111.80.20.80.00.025.3
1986-870.00.00.00.08.74.934.01.61.70.40.00.051.3
1987-880.00.00.0T8.65.822.617.64.9TT0.059.5
1988-890.00.00.00.00.06.30.64.63.4TT0.014.9
1989-900.00.00.00.05.312.410.59.04.31.50.00.043.0
1990-910.00.00.00.0T8.110.25.85.70.00.00.029.8
1991-920.00.00.00.00.76.01.75.37.32.60.00.023.6
1992-930.00.00.0TT6.710.513.831.1T0.0T62.1
1993-940.00.00.00.0T6.731.329.417.50.0T0.084.9
1994-950.00.00.00.03.91.15.710.10.01.50.00.022.3
1995-960.00.00.00.05.620.342.820.617.8
1996-97
1997-98
1998-99
1999-00
2000-018.010.421.413.50.0
2001-3.0
POR=41 YRS0.00.00.00.12.110.312.711.79.81.50.0T48.2

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