2001 Dallas – Fort Worth, Texas (DFW)

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2001 DALLAS – FORT WORTH, TEXAS (DFW)

The Dallas–Fort Worth Metroplex is located in North Central Texas, approximately 250 miles north of the Gulf of Mexico. It is near the headwaters of the Trinity River, which lie in the upper margins of the Coastal Plain. The rolling hills in the area range from 500 to 800 feet in elevation.

The Dallas–Fort Worth climate is humid subtropical with hot summers. It is also continental, characterized by a wide annual temperature range. Precipitation also varies considerably, ranging from less than 20 to more than 50 inches.

Winters are mild, but northers occur about three times each month, and often are accompanied by sudden drops in temperature. Periods of extreme cold that occasionally occur are short–lived, so that even in January mild weather occurs frequently.

The highest temperatures of summer are associated with fair skies, westerly winds and low humidities. Characteristically, hot spells in summer are broken into three–to–five day periods by thunderstorm activity. There are only a few nights each summer when the low temperature exceeds 80 degrees. Summer daytime temperatures frequently exceed 100 degrees. Air conditioners are recommended for maximum comfort indoors and while traveling via automobile.

Throughout the year, rainfall occurs more frequently during the night. Usually, periods of rainy weather last for only a day or two, and are followed by several days with fair skies. A large part of the annual precipitation results from thunderstorm activity, with occasional heavy rainfall over brief periods of time. Thunderstorms occur throughout the year, but are most frequent in the spring. Hail falls on about two or three days a year, ordinarily with only slight and scattered damage. Windstorms occurring during thunderstorm activity are sometimes destructive. Snowfall is rare.

The average length of the warm season (freeze–free period) in the Dallas–Fort Worth Metroplex is about 249 days. The average last occurrence of 32 degrees or below is mid March and the average first occurrence of 32 degrees or below is in late November.

NORMALS, MEANS, AND EXTREMES

DALLAS–FORT WORTH, TX (DFW)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 03927

32 53′ 47″ N  97 02′ 28″ W  GRND: 559  BARO: 562  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3054.158.967.876.382.991.996.596.287.878.566.857.576.3
MEAN DAILY MAXIMUM5454.860.067.576.283.391.696.095.888.578.766.357.876.4
HIGHEST DAILY MAXIMUM48889596951031131101081111028988113
YEAR OF OCCURRENCE196919961991199019851980199820002000197919891955JUN 1980
MEAN OF EXTREME MAXS.5476.180.085.189.194.198.8102.7103.398.792.482.977.290.0
NORMAL DAILY MINIMUM3032.736.945.654.762.670.074.173.666.955.845.436.354.6
MEAN DAILY MINIMUM5433.938.445.354.563.170.974.774.267.056.244.837.055.0
LOWEST DAILY MINIMUM4847152941515956432920-1-1
YEAR OF OCCURRENCE196419851980198919781964197219671984199319591989DEC 1989
MEAN OF EXTREME MINS.5416.221.627.837.749.760.467.765.952.540.428.720.640.8
NORMAL DRY BULB3043.447.956.765.572.881.085.384.977.467.256.246.965.4
MEAN DRY BULB5444.449.256.365.373.181.285.385.177.767.355.447.365.6
MEAN WET BULB1840.545.050.557.866.672.373.973.168.159.650.142.558.3
MEAN DEW POINT1834.438.244.051.562.368.268.667.362.653.944.436.652.7
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.21.04.519.527.526.814.43.10.00.097.0
MAXIMUM 32301.90.70.10.00.00.00.00.00.00.00.00.93.6
MINIMUM 323015.79.32.80.20.00.00.00.00.0*2.310.741.0
MINIMUM 0300.00.00.00.00.00.00.00.00.00.00.0*0.0
H/CNORMAL HEATING DEG. DAYS306704842867500000512755662407
NORMAL COOLING DEG. DAYS300529902464806296173721191152603
RHNORMAL (PERCENT)3068666465706660606666676866
HOUR 00 LST3072726972787467667473747372
HOUR 06 LST3079807982878580808482817982
HOUR 12 LST3060585656595549495554565956
HOUR 18 LST3057545052565044445254585952
SPERCENT POSSIBLE SUNSHINE1752545861576775736763575261
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)482.51.51.00.60.30.10.00.00.10.81.52.410.8
THUNDERSTORMS481.41.94.56.07.66.24.54.33.43.02.11.346.2
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)14.04.03.24.8
MIDNIGHT-MIDNIGHT (OKTAS)14.0
MEAN NO. DAYS WITH:
CLEAR12.06.015.010.011.0
PARTLY CLOUDY12.04.08.0
CLOUDY12.07.06.02.0
PRMEAN STATION PRESSURE(IN)2929.4929.4929.4029.3029.3029.3029.4029.4029.3929.4029.4029.5029.40
MEAN SEA-LEVEL PRES. (IN)1830.1330.0830.0129.9329.9029.9129.9629.9629.9830.0430.0830.1330.01
WINDSMEAN SPEED (MPH)4811.011.712.612.411.110.610.09.19.49.911.011.110.8
PREVAIL. DIR (TENS OF DEGS)518181818181818181616181818
MAXIMUM 2-MINUTE:
SPEED (MPH)641514847434736473346403951
DIR. (TENS OF DEGS)29233030343211332423283323
YEAR OF OCCURRENCE199620002000200019981996199919961996200120012000FEB 2000
MAXIMUM 5-SECOND:
SPEED (MPH)651787464555745473954474778
DIR. (TENS OF DEGS)19232726283412341923302623
YEAR OF OCCURRENCE199620002000200020001996199919962001200119981997FEB 2000
PRECIPITATIONNORMAL (IN)301.832.182.773.504.882.982.312.213.393.522.291.8433.70
MAXIMUM MONTHLY (IN)485.077.406.6912.1913.668.7511.136.859.5214.186.958.7514.18
YEAR OF OCCURRENCE199819971995195719821989197319701964198120001991OCT 1981
MINIMUM MONTHLY (IN)48T0.150.100.110.950.400.000.000.09T0.200.170.00
YEAR OF OCCURRENCE198619631972198719961964199320001984197519701981AUG 2000
MAXIMUM IN 24 HOURS (IN)483.154.064.394.555.343.153.834.054.765.912.834.225.91
YEAR OF OCCURRENCE199819651977195719891989200119761965195919641991OCT 1959
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01306.76.37.37.68.76.44.74.67.16.26.06.578.1
PRECIPITATION 1.00300.30.50.71.21.40.90.70.81.11.40.60.410.0
SNOWFALLNORMAL (IN)301.41.00.20.00.00.00.00.00.00.00.20.33.1
MAXIMUM MONTHLY (IN)4312.113.52.5TT0.00.00.00.0T5.02.613.5
YEAR OF OCCURRENCE19641978196219951995199319761963FEB 1978
MAXIMUM IN 24 HOURS (IN)4312.17.52.5TT0.00.00.00.0T4.82.512.1
YEAR OF OCCURRENCE19641978196219951995199319761963JAN 1964
MAXIMUM SNOW DEPTH (IN)486820000000328
YEAR OF OCCURRENCE19641978197119761983FEB 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0300.50.40.10.00.00.00.00.00.00.00.*0.11.1
PRECIPITATION (inches) 2001 DALLAS – FORT WORTH, TX (DFW)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.090.260.103.252.351.500.590.812.426.892.360.6122.23
19733.261.922.286.063.185.8811.130.017.166.852.060.8350.62
19741.791.010.802.516.005.440.674.196.045.933.321.9339.63
19753.343.721.673.406.881.955.060.300.87T0.421.4929.10
19760.130.522.295.716.031.403.834.755.023.460.501.9935.63
19772.391.685.884.310.990.692.202.331.722.961.790.2527.19
19781.413.332.661.348.010.770.331.530.930.552.730.7824.37
19793.351.526.332.035.901.361.942.470.993.380.432.7232.42
19802.520.841.242.233.011.250.71T6.541.081.231.4322.08
19810.581.443.392.696.247.851.812.322.4014.181.530.1744.60
19822.331.891.712.7113.664.282.730.520.583.364.222.7640.75
19832.551.254.360.595.832.071.565.550.224.042.220.8331.07
19841.073.114.921.413.042.790.431.470.096.502.976.0933.89
19850.812.623.703.752.133.782.400.533.353.913.110.6130.70
1986T2.491.085.305.523.920.411.634.601.813.252.4432.45
19871.223.671.700.115.953.451.770.811.380.124.172.9027.25
19880.881.232.032.212.113.232.470.444.041.642.282.4825.04
19892.563.703.721.869.628.752.611.892.402.020.490.3339.95
19904.544.725.896.907.161.892.602.371.122.813.811.4645.27
19912.722.601.353.636.974.263.994.304.619.321.048.7553.54
19923.252.403.242.466.935.232.482.083.253.053.564.2642.19
19931.745.783.033.491.753.750.000.753.285.101.622.5432.83
19941.432.011.693.625.802.054.584.891.398.196.032.4244.10
19952.110.446.696.837.502.413.450.861.540.750.742.0835.40
19960.970.352.362.140.953.423.855.021.516.565.540.4733.14
19970.337.402.216.733.923.991.683.132.015.661.016.9345.00
19985.073.224.451.252.381.750.110.350.685.644.914.4334.24
19991.440.482.842.746.910.990.77T2.302.260.312.5523.59
20001.593.302.924.283.175.93T0.000.164.386.953.5736.25
20012.446.175.270.895.581.283.852.723.721.861.113.2438.13
POR=103 YRS1.030.542.422.211.133.403.744.841.546.445.410.6633.36
AVERAGE TEMPERATURE (F) 2001 DALLAS – FORT WORTH, TX (DFW)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197245.051.562.170.172.781.483.184.780.867.550.144.066.1
197342.547.960.060.771.779.383.982.976.168.359.848.465.1
197443.652.362.965.875.778.786.182.970.969.255.547.265.9
197549.046.653.864.772.480.983.684.875.669.857.349.065.6
197645.058.459.464.968.678.882.184.276.160.249.545.064.4
197734.749.457.266.877.484.187.184.981.666.756.447.666.2
197833.836.754.167.173.182.388.484.680.268.957.746.164.4
197935.442.256.764.469.781.084.582.577.070.852.949.463.9
198045.546.654.263.175.087.092.088.580.365.454.949.466.8
198144.648.955.769.270.580.385.983.476.266.157.547.365.5
198244.644.559.862.572.579.284.686.778.167.055.649.265.4
198343.448.554.560.669.577.383.684.977.167.857.334.863.3
198439.350.956.363.773.782.585.585.876.167.054.652.665.7
198537.845.060.867.274.080.284.487.677.767.656.342.365.1
198648.851.260.267.271.580.886.483.480.265.752.446.166.2
198744.550.853.965.075.179.683.486.577.166.555.747.365.5
198842.247.156.064.572.880.485.387.979.265.758.149.165.7
198950.042.256.766.474.377.982.882.374.769.058.239.064.5
199051.853.957.764.073.484.082.584.680.066.459.844.066.8
199142.853.759.867.475.481.085.082.575.268.151.750.366.1
199246.954.459.166.071.179.484.380.277.769.552.749.965.9
199345.149.056.163.371.981.787.387.578.263.851.649.565.4
199445.748.659.065.971.584.183.984.076.367.357.949.066.1
199548.252.556.964.273.279.985.585.576.667.854.847.566.1
199643.052.153.364.279.782.586.282.574.566.954.949.265.8
199744.049.558.360.470.178.884.983.180.267.252.145.664.5
199848.451.154.963.878.585.591.687.883.669.557.647.068.3
199948.655.556.467.973.882.186.190.279.069.262.951.568.6
200050.657.361.065.376.680.787.390.280.469.749.839.467.4
200142.750.251.867.874.280.386.784.974.665.059.749.565.6
POR=103 YRS45.249.056.965.172.881.084.784.877.967.655.947.465.7

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 DALLAS – FORT WORTH, TX (DFW)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73003964466446904751551821202703
1973-740013618250965635217370101980
1974-75002016296546489508355112002342
1975-7600433266500616217222482001926
1976-7700021445961493143124137002927
1977-7800055257536962786346544103037
1978-7900027247578911635261782902766
1979-8000034370478597530339102602456
1980-81001899330486625448284262302339
1981-820010116228541625569232140902470
1982-83001943164956634543241862122556
1983-84001252269933789401281891102837
1984-8500386632238983755817137002418
1985-8600195328569649540016441502158
1986-8700061376580632387342109002487
1987-880005529754070351230170002478
1988-8900051240487460630294102402268
1989-900014802517994013062511021902223
1990-9100010019064668131419837702173
1991-92001269405456555302182731402068
1992-9300014366474612445290120402325
1993-94002145414476594451229832702421
1994-9500671226487521348289861302047
1995-96002241304549671403384104002478
1996-970014513084836504292131551602319
1997-980008938359351238334786002393
1998-990003122655950526626339301892
1999-000004411842144723916977001515
2000-0100126445878568541740241002864
2001-00377191489
COOLING DEGREE DAYS (base 65 F) 2001 DALLAS – FORT WORTH, TX (DFW)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197221457185249498569618480183402859
1973106602304355935593421463302405
1974021151013414196605632021532022578
197500151072364835806203311893992609
1976032595213842153760233872002251
197700794391581693626505112623017
197800161253015247336144621533702965
1979019671794896135513662201402509
198000115232066884473748511735103279
1981055158200467654577352155802581
198212777125243361467940316040102742
1983007611713825826263811454602401
198400206028853164465237613516122734
198505511082874606087064081392902801
19860192411221248067357846491302656
19870061143184425766743701112302634
1988402861247467639714433783912711
198910451542973935615423142085202567
19901230792865755516174571524122793
199103421153354846245503241741452670
19920241092134376064803861614132415
19930019752235076977014061152042767
199430501192385785915963501491912694
19955544672714566416433741326122656
199603727874645316635493021201022792
1997601224181423622566461163302461
1998004556424623831710563177993447
19994541342825206627854251816393074
20007234993364475698787482215703200
20010601342934656826243008639132642
SNOWFALL (inches) 2001 DALLAS – FORT WORTH, TX (DFW)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.0T1.42.3T0.00.00.00.03.7
1973-740.00.00.00.00.00.0T0.00.00.00.00.0T
1974-750.00.00.00.0TTT3.7T0.00.00.03.7
1975-760.00.00.00.00.00.40.00.0T0.00.00.00.4
1976-770.00.00.00.05.00.05.40.00.00.00.00.010.4
1977-780.00.00.00.00.00.04.113.5T0.00.00.017.6
1978-790.00.00.00.00.00.81.80.70.00.00.00.03.3
1979-800.00.00.00.00.0T0.01.60.00.00.00.01.6
1980-810.00.00.00.00.00.0TT0.00.00.00.0T
1981-820.00.00.00.00.00.00.8T0.00.00.00.00.8
1982-830.00.00.00.00.0TTT0.00.00.00.0T
1983-840.00.00.00.00.02.00.00.00.00.00.00.02.0
1984-850.00.00.00.00.00.03.41.70.00.00.00.05.1
1985-860.00.00.00.00.0T0.00.80.00.00.00.00.8
1986-870.00.00.00.00.01.7TT0.50.00.00.02.2
1987-880.00.00.00.00.0T0.82.70.00.00.00.03.5
1988-890.00.00.00.00.0TT0.71.10.0T0.01.8
1989-900.00.00.00.00.0T0.00.00.0TT0.0T
1990-910.00.00.00.00.00.30.30.00.00.00.00.00.6
1991-920.00.00.00.00.00.0T0.00.00.00.00.0T
1992-930.00.00.00.00.0T0.00.00.00.00.00.0T
1993-940.00.00.0T0.3TT0.1TTT0.00.4
1994-950.00.00.00.00.00.0T0.0TTT0.0T
1995-960.00.00.00.0T0.0
1996-97TT
1997-98
1998-99
1999-00
2000-01
2001-
POR=42 YRS0.00.00.0T0.10.21.10.90.2TT0.02.5

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