2001 Burlington, Vermont (BTV)

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2001 BURLINGTON, VERMONT (BTV)

Burlington is located on the eastern shore of Lake Champlain at the widest part of the lake. About 35 miles to the west lie the highest peaks of the Adirondacks, while the foothills of the Green Mountains begin 10 miles to the east and southeast.

Its northerly latitude assures the variety and vigor of a true New England climate, while thanks to the modifying influence of the lake, the many rapid and marked weather changes are tempered in severity. Due to its location in the path of the St. Lawrence Valley storm track and the lake effects, the city is one of the cloudiest in the United States.

Lake Champlain exercises a tempering influence on the local temperature. During the winter months and prior to the lake freezing, temperatures along the lake shore are often 5–10 degrees warmer than at the airport 3 l/2 miles inland. At the airport the average occurrence of the last freeze in spring is around May l0th and that of the first in fall is early October, giving a growing season of 145 days. This location is justly proud of its delightful summer weather. On average, there are few days a year with maxima of 90 degrees or higher. This moderate summer heat gives way to a cooler, but none the less pleasant fall period, usually extending well into October. High pressure systems moving down rapidly from central Canada or Hudson Bay produce the coldest temperatures during the winter months, but extended periods of very cold weather are rare.

Precipitation, although generally plentiful and well distributed throughout the year, is less in the Champlain Valley than in other areas of Vermont due to the shielding effect of the mountain barriers to the east and west. The heaviest rainfall usually occurs during summer thunderstorms, but excessively heavy rainfall is quite uncommon. Droughts are infrequent.

Because of the trend of the Champlain Valley between the Adirondack and Green Mountain ranges, most winds have a northerly or southerly component. The prevailing direction most of the year is from the south. Winds of damaging force are very uncommon.

Smoke pollution is nearly non–existent since there is no concentration of heavy industry here, however, haze has been on the increase over the years due to the large increase in industry to the north and south. During the spring and fall months, fog occasionally forms along the Winooski River to the north and east and may drift over the airport with favorable winds. In spite of the high percentage of cloudiness, periods of low aircraft ceilings and visibilities are usually of short duration, allowing this area to have one of the highest percentages of flying weather in New England.

NORMALS, MEANS, AND EXTREMES

BURLINGTON, VT (BTV)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14742

44 28′ 05″ N  73 09′ 01″ W  GRND:  345  BARO:  348  EASTERN (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3025.127.539.353.667.275.881.277.969.057.044.030.454.0
MEAN DAILY MAXIMUM5426.328.838.453.467.076.280.878.269.057.544.431.754.3
HIGHEST DAILY MAXIMUM58666284919310010010194857567101
YEAR OF OCCURRENCE199519811998197619771995199519441945194919481998AUG 1944
MEAN OF EXTREME MAXS.5448.047.061.074.985.090.492.490.084.875.064.552.172.1
NORMAL DAILY MINIMUM307.58.922.034.245.454.659.757.948.838.629.615.535.2
MEAN DAILY MINIMUM548.710.120.933.344.754.559.357.349.338.930.116.635.3
LOWEST DAILY MINIMUM58-30-30-202243339352515-2-26-30
YEAR OF OCCURRENCE195719791948197219661986196219761963197219581980FEB 1979
MEAN OF EXTREME MINS.54-14.9-13.5-1.318.830.339.746.944.133.324.211.6-7.917.6
NORMAL DRY BULB3016.318.230.743.956.365.270.567.958.947.836.823.044.6
MEAN DRY BULB5417.519.429.743.455.865.370.167.759.248.337.324.244.8
MEAN WET BULB1818.119.227.239.150.459.163.462.354.944.334.524.041.4
MEAN DEW POINT1812.112.520.031.343.453.659.058.150.939.028.818.435.6
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.10.51.22.91.00.10.00.00.05.8
MAXIMUM 323021.318.38.60.60.00.00.00.00.0*4.317.470.5
MINIMUM 323030.126.426.015.93.20.00.00.00.98.919.128.1158.6
MINIMUM 03010.38.72.00.00.00.00.00.00.00.00.05.026.0
H/CNORMAL HEATING DEG. DAYS301510131010636332825862919953384613027771
NORMAL COOLING DEG. DAYS300000136417611916000388
RHNORMAL (PERCENT)
HOUR 01 LST3071727374778183858579767578
HOUR 07 LST3072747573747779838681787677
HOUR 13 LST3064615853515453576161666759
HOUR 19 LST3068656358576061677371727266
SPERCENT POSSIBLE SUNSHINE5841485149555964605447313349
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)581.01.21.41.30.91.10.81.42.41.91.21.115.7
THUNDERSTORMS580.00.00.41.02.55.06.05.02.10.60.30.022.9
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)536.05.85.75.85.65.45.05.05.15.46.46.35.6
MIDNIGHT-MIDNIGHT (OKTAS)325.95.45.35.35.35.04.84.85.05.36.26.25.4
MEAN NO. DAYS WITH:
CLEAR544.64.55.85.04.94.85.15.95.95.92.52.957.8
PARTLY CLOUDY546.46.96.97.59.310.812.711.69.87.65.25.7100.4
CLOUDY5420.116.918.317.516.714.412.713.113.817.121.721.7204.0
PRMEAN STATION PRESSURE(IN)2929.6129.7029.6029.6029.5929.5929.6029.7029.6829.7029.6929.6929.65
MEAN SEA-LEVEL PRES. (IN)1830.0630.0630.0429.9729.9529.9429.9630.0230.0530.0830.0630.0630.02
WINDSMEAN SPEED (MPH)479.89.49.59.59.08.58.17.88.58.99.810.09.1
PREVAIL. DIR (TENS OF DEGS)3118181818181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)538373236333234353631333538
DIR. (TENS OF DEGS)18251833191932273229192718
YEAR OF OCCURRENCE199720011997200019972000199920001999199819992000JAN 1997
MAXIMUM 5-SECOND:
SPEED (MPH)551474443404143464841434551
DIR. (TENS OF DEGS)19191932192831263227181819
YEAR OF OCCURRENCE199719971997200019971998199920001999199819981998JAN 1997
PRECIPITATIONNORMAL (IN)301.821.632.232.763.123.473.654.063.302.883.132.4234.47
MAXIMUM MONTHLY (IN)585.155.384.146.556.318.669.3111.5410.266.226.855.9511.54
YEAR OF OCCURRENCE199819812001198319831998199819551999195919831973AUG 1955
MINIMUM MONTHLY (IN)580.420.210.380.730.290.820.770.720.870.500.630.370.21
YEAR OF OCCURRENCE198919781965199919771995200119571948196319521998FEB 1978
MAXIMUM IN 24 HOURS (IN)582.111.931.622.162.262.832.693.623.962.172.482.603.96
YEAR OF OCCURRENCE199819811971196819551972198519981999198319901950SEP 1999
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013014.010.813.012.314.113.211.913.411.512.414.515.3156.4
PRECIPITATION 1.00300.10.10.20.10.30.50.80.80.70.50.20.24.5
SNOWFALLNORMAL (IN)3019.015.113.04.80.30.00.00.00.00.37.421.381.2
MAXIMUM MONTHLY (IN)5842.434.347.621.33.90.0TT0.15.119.256.756.7
YEAR OF OCCURRENCE19781958200119831966198920011992196919711970DEC 1970
MAXIMUM IN 24 HOURS (IN)5814.517.722.415.63.50.0TT0.15.110.117.022.4
YEAR OF OCCURRENCE19611995199319831966198920011992196919581978MAR 1993
MAXIMUM SNOW DEPTH (IN)5340333116100005103340
YEAR OF OCCURRENCE19641958199320011967196919581969JAN 1964
NORMAL NO. DAYS WITH:
SNOWFALL 1.0305.24.33.91.50.10.00.00.00.00.12.25.823.1
PRECIPITATION (inches) 2001 BURLINGTON, VT (BTV)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.931.693.582.262.836.526.122.351.692.604.103.4338.10
19732.131.552.093.805.387.693.025.415.021.932.315.9546.28
19741.901.542.733.474.614.453.702.603.230.783.602.0834.69
19752.202.012.861.711.172.473.772.854.123.853.142.3632.51
19762.992.852.352.545.864.043.054.693.774.341.631.9740.08
19771.611.782.973.130.292.063.346.276.335.024.223.4240.44
19784.690.212.982.512.164.363.501.822.073.720.952.1131.08
19794.500.602.153.613.121.391.233.423.842.313.891.5031.56
19800.610.672.442.391.611.926.113.834.412.482.921.5030.89
19810.495.381.323.053.763.073.225.586.245.262.732.0342.13
19822.741.432.312.631.954.953.073.552.122.313.591.6932.34
19833.091.662.606.556.311.493.924.313.774.386.855.2350.16
19840.812.731.724.255.271.705.113.302.811.893.083.1435.81
19851.461.262.461.903.533.764.422.673.303.313.681.5933.34
19863.691.683.170.954.114.404.535.824.862.502.991.3240.02
19871.910.491.331.422.694.422.792.093.583.282.241.1727.41
19880.691.691.551.911.803.262.554.271.502.054.510.9026.68
19890.420.672.601.893.193.683.657.305.982.982.411.2636.03
19902.362.821.812.973.663.085.124.852.035.993.913.5842.18
19911.650.512.553.413.151.282.834.005.145.071.581.3532.52
19921.651.562.132.582.381.724.581.894.733.003.670.9630.85
19932.171.901.543.762.193.353.344.463.382.932.271.5732.86
19942.191.212.933.374.583.655.304.501.741.252.481.6634.86
19951.881.261.602.351.410.823.494.642.975.813.332.6332.19
19963.910.830.806.125.334.544.741.472.753.643.300.6438.07
19971.711.382.591.542.242.623.894.632.981.234.161.6530.62
19985.151.843.811.793.618.669.316.805.642.421.020.3750.42
19993.511.132.220.732.401.791.972.4110.263.181.861.1232.58
20002.302.671.635.016.133.553.163.673.021.802.963.3639.26
20010.981.544.140.852.282.320.774.321.401.371.811.4923.27
POR=118 YRS1.881.652.182.543.063.473.633.523.372.882.702.0132.89
AVERAGE TEMPERATURE (F) 2001 BURLINGTON, VT (BTV)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197221.117.024.835.656.263.169.565.358.742.432.122.542.4
197321.514.637.144.653.666.970.672.158.549.337.227.446.1
197418.715.629.244.451.366.570.269.158.243.436.228.544.3
197523.620.728.037.162.366.474.669.158.050.442.120.146.0
197611.124.633.447.454.769.268.565.757.043.733.016.343.7
197711.120.537.645.360.064.769.667.558.746.640.022.445.3
197815.19.526.038.760.163.969.468.355.246.434.825.242.7
197918.07.536.943.558.565.372.265.958.648.141.329.045.4
198021.217.631.146.558.964.470.670.757.945.032.315.044.3
19818.932.933.546.758.266.171.167.159.344.936.925.345.9
19829.619.130.343.457.360.769.565.962.350.142.331.945.2
198321.022.333.042.352.966.371.368.662.948.238.122.445.8
198416.528.721.944.752.366.070.371.157.250.038.430.345.6
198513.422.531.644.355.861.769.667.560.349.136.921.344.5
198618.516.233.748.558.362.368.566.158.146.934.527.845.0
198718.115.033.348.655.566.371.566.759.545.937.028.545.5
198819.921.429.744.357.963.473.270.758.244.439.622.945.5
198923.719.728.441.659.667.271.767.761.450.336.47.644.6
199029.823.533.846.252.965.970.269.859.449.439.530.147.5
199118.926.534.049.159.365.970.470.557.850.437.624.047.0
199218.619.126.542.356.564.466.167.660.245.536.728.144.3
199321.710.627.445.356.664.772.270.859.146.136.824.744.7
19947.115.430.244.554.868.674.266.559.649.841.128.745.0
199527.919.035.040.456.469.674.770.057.554.135.222.046.8
199617.521.328.642.854.466.368.668.962.047.432.832.745.3
199719.125.026.941.451.467.368.766.858.646.635.125.844.4
199822.727.734.346.462.066.168.968.561.549.639.732.048.3
199919.124.830.944.759.870.574.268.164.546.242.628.747.8
200018.122.136.542.756.763.667.567.758.848.837.219.644.9
200120.122.127.243.258.767.268.072.661.351.142.432.747.2
POR=109 YRS17.918.929.743.055.665.069.967.659.648.536.923.844.7

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 BURLINGTON, VT (BTV)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-732669212694982131013441410855608345867941
1973-7410172564808251160143113781101618430377743
1974-75262246658581128127612361141831152827601
1975-76045208448681138516691168973545331507503
1976-772068254654954150516671240842590223898106
1977-7824532075647401314153915471202781225908286
1978-794938295571897122714521610866641224907960
1979-8023652135287031107135013711043550204917248
1980-8110324061197615451738894969544239437812
1981-82133620461783712241716127710696432551338024
1982-833054124455676102113561188983675367777006
1983-8419361485188031317150010441331602395687781
1984-8562424146079210681592118510296152961187426
1985-8611421694898351344143613619664922191137477
1986-874060215553906114414461397975488328487600
1987-88196618558483311251389126010886142361367535
1988-8915522126357551298127312651128691188457557
1989-90243164451849177610841156961577370637496
1990-911910180480758107414241072954475206596711
1991-927112404518131266143413271187674277837770
1992-9349331975978431137133515171159584256807787
1993-943122115798391243179313851073609328488123
1994-95157168467711111811451283925733268366912
1995-960212323308851326146612621123659336277667
1996-971110138542960995141611131173701412317502
1997-981720205564889120813061039947552115816943
1998-998191294737541017141811201053606184316812
1999-001201135786661119144812358796632631087093
2000-0128282094988281399138511931169649206497641
2001-3210152431670998
COOLING DEGREE DAYS (base 65 F) 2001 BURLINGTON, VT (BTV)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
1972000014641698130000358
19730003014918724368000650
1974000598917114027100442
19750000751313061815100699
197600024191851359723000483
19770007758617413827000507
1978000079641941466000489
1979000229106253101271300531
19800000247818918434000509
19810002358521111039000482
1982000124111799051000356
19830000012122315592600597
19840000710617521715300523
19850000152516012334000357
19860004193815610414000335
19870003429222812630000521
19880000199627423815300645
198900002811721613463000558
19900001619518916518600490
19910005359218218632600538
1992000321719112161000368
1993000027923519839000553
199400021716529311014000601
19950000817930618212000687
19960000177212413956000408
1997000001081428217000349
199800202712114113433100459
1999000029207295125106000762
20000000127411211831100348
200100001712213225149600577
SNOWFALL (inches) 2001 BURLINGTON, VT (BTV)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0T12.239.011.418.52.36.30.00.089.7
1973-740.00.00.00.12.624.121.59.920.916.80.00.095.9
1974-750.00.00.00.111.516.814.822.012.413.30.00.090.9
1975-760.00.00.0T5.316.028.320.418.80.9T0.089.7
1976-770.00.00.00.913.311.524.216.49.61.8T0.077.7
1977-780.00.00.00.016.022.642.44.012.51.9T0.099.4
1978-790.00.00.0T5.724.137.96.61.68.40.00.084.3
1979-800.00.00.01.50.46.03.011.616.80.30.00.039.6
1980-810.00.00.0T12.217.58.711.913.31.10.00.064.7
1981-820.00.00.0T3.932.819.48.313.04.10.00.081.5
1982-830.00.00.0T0.85.022.518.311.921.30.70.080.5
1983-840.00.00.0T4.714.415.213.716.10.4T0.064.5
1984-850.00.00.00.06.029.325.910.916.62.70.00.091.4
1985-860.00.00.0T4.621.333.618.38.4TT0.086.2
1986-870.00.00.0T10.57.734.47.06.02.10.00.067.7
1987-880.00.00.00.66.512.49.226.96.42.40.00.064.4
1988-890.00.00.00.30.612.46.68.59.72.30.00.040.4
1989-90T0.00.00.05.620.717.620.510.22.10.00.076.7
1990-910.00.0TT7.310.317.83.93.2T0.00.042.5
1991-920.00.0TT2.314.912.227.214.08.60.00.079.2
1992-930.00.00.1T2.92.624.833.839.912.80.00.0116.9
1993-940.00.00.01.37.99.138.615.926.67.8T0.0107.2
1994-950.00.00.00.05.14.38.726.810.74.90.00.060.5
1995-960.00.00.00.17.344.019.04.511.512.40.30.099.1
1996-970.00.00.0T14.313.722.08.827.09.1T0.094.9
1997-980.00.00.00.615.520.625.110.321.50.30.00.093.9
1998-990.00.00.0T2.44.430.410.822.7T0.00.070.7
1999-000.00.00.0T0.72.321.923.19.319.10.00.076.4
2000-01T0.00.03.08.732.815.714.447.60.2T0.0122.4
2001-0.0T0.0T1.813.9
POR=57 YRST0.00.00.26.518.019.016.513.64.20.50.078.5

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