2001 Tulsa, Oklahoma (TUL)

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2001 TULSA, OKLAHOMA (TUL)

The city of Tulsa lies along the Arkansas River at an elevation of 700 feet above sea level. The surrounding terrain is gently rolling.

At latitude 36 degrees, Tulsa is far enough north to escape the long periods of heat in summer, yet far enough south to miss the extreme cold of winter. The influence of warm moist air from the Gulf of Mexico is often noted, due to the high humidity, but the climate is essentially continental characterized by rapid changes in temperature. Generally the winter months are mild. Temperatures occasionally fall below zero but only last a very short time. Temperatures of 100 degrees or higher are often experienced from late July to early September, but are usually accompanied by low relative humidity and a good southerly breeze. The fall season is long with a great number of pleasant, sunny days and cool, bracing nights.

Rainfall is ample for most agricultural pursuits and is distributed favorably throughout the year. Spring is the wettest season, having an abundance of rain in the form of showers and thunderstorms.

The steady rains of fall are a contrast to the spring and summer showers and provide a good supply of moisture and more ideal conditions for the growth of winter grains and pastures. The greatest amounts of snow are received in January and early March. The snow is usually light and only remains on the ground for brief periods.

The average date of the last 32 degree temperature occurrence is late March and the average date of the first 32 degree occurrence is early November. The average growing season is 216 days.

The Tulsa area is occasionally subjected to large hail and violent windstorms which occur mostly during spring and early summer, although occurrences have been noted throughout the year.

Prevailing surface winds are southerly during most of the year. Heavy fogs are infrequent. Sunshine is abundant. The prevalence of good flying weather throughout the year has contributed to the development of Tulsa as an aviation center.

NORMALS, MEANS, AND EXTREMES

TULSA, OK (TUL)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 13968

36 11′ 51″ N  95 53′ 11″ W  GRND:  739  BARO:  742  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3045.451.062.173.079.787.793.792.583.673.860.348.871.0
MEAN DAILY MAXIMUM6546.752.461.072.179.387.493.392.884.674.760.250.171.2
HIGHEST DAILY MAXIMUM6279909610296103112110109988780112
YEAR OF OCCURRENCE195019961974197219851953195419701939197919451966JUL 1954
MEAN OF EXTREME MAXS.5368.774.583.088.090.796.1102.0102.096.789.478.571.086.7
NORMAL DAILY MINIMUM3024.929.539.149.958.867.772.870.663.050.739.528.949.6
MEAN DAILY MINIMUM6526.430.738.549.658.767.572.270.562.350.938.630.049.7
LOWEST DAILY MINIMUM62-8-11-32235495152351810-8-11
YEAR OF OCCURRENCE194719961948195719611954197119881984199319761989FEB 1996
MEAN OF EXTREME MINS.536.812.420.433.344.455.562.359.546.334.222.311.434.1
NORMAL DRY BULB3035.240.350.661.569.377.783.381.573.362.249.938.960.3
MEAN DRY BULB6536.641.549.960.969.177.582.881.773.462.849.340.060.5
MEAN WET BULB5532.236.543.452.962.369.872.771.265.054.943.635.453.3
MEAN DEW POINT5525.729.635.746.158.066.168.466.760.349.237.429.147.7
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.30.82.113.324.022.09.41.60.00.073.5
MAXIMUM 32305.82.60.30.00.00.00.00.00.00.00.23.112.0
MINIMUM 323023.917.28.50.50.00.00.00.00.00.37.620.178.1
MINIMUM 0300.60.10.00.00.00.00.00.00.00.00.00.41.1
H/CNORMAL HEATING DEG. DAYS3092469245715141000201444538093691
NORMAL COOLING DEG. DAYS3000114617438156751226957002017
RHNORMAL (PERCENT)3067656261696964647066676866
HOUR 00 LST3072706868787872737975747373
HOUR 06 LST3078777678858682848682807981
HOUR 12 LST3059575351585853535853576056
HOUR 18 LST3058554948565649505755596154
SPERCENT POSSIBLE SUNSHINE5354555859596976746865565362
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)622.11.60.90.20.40.30.20.10.61.11.21.710.4
THUNDERSTORMS620.71.33.46.18.78.25.65.95.13.11.60.950.6
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)16.45.65.26.05.22.83.22.75.63.54.84.04.6
MIDNIGHT-MIDNIGHT (OKTAS)16.45.66.46.04.82.42.82.84.03.54.84.84.5
MEAN NO. DAYS WITH:
CLEAR35.08.38.09.59.710.713.515.07.510.07.09.0113.2
PARTLY CLOUDY33.73.31.01.03.78.06.55.03.53.51.05.045.2
CLOUDY38.37.38.710.58.73.74.04.54.56.59.57.083.2
PRMEAN STATION PRESSURE(IN)2729.4229.3729.2529.2329.2029.2229.2629.2829.3129.3429.3429.4129.30
MEAN SEA-LEVEL PRES. (IN)5530.1530.1029.9929.9529.9329.9229.9629.9830.0030.0530.0830.1330.02
WINDSMEAN SPEED (MPH)4210.310.611.811.810.79.79.38.68.99.610.410.210.2
PREVAIL. DIR (TENS OF DEGS)2818181818181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)937414655414951383938443655
DIR. (TENS OF DEGS)18201834302819292735293334
YEAR OF OCCURRENCE199620001997199320011998199320011999200119982000APR 1993
MAXIMUM 5-SECOND:
SPEED (MPH)947535563486155514946524463
DIR. (TENS OF DEGS)19211634292819292730293434
YEAR OF OCCURRENCE199620001997199320011998199320011999199419982000APR 1993
PRECIPITATIONNORMAL (IN)301.541.973.463.725.604.443.093.124.703.663.132.1640.59
MAXIMUM MONTHLY (IN)626.655.7311.949.2318.0011.1711.397.8918.8116.517.578.7018.81
YEAR OF OCCURRENCE194919851973194719431948199419971971194119461984SEP 1971
MINIMUM MONTHLY (IN)620.000.160.080.341.170.530.030.01TT0.010.100.00
YEAR OF OCCURRENCE199319961971198919881963195420001948195219491996JAN 1993
MAXIMUM IN 24 HOURS (IN)622.254.342.724.589.275.017.545.376.395.805.143.279.27
YEAR OF OCCURRENCE194619851998196419841941196319891940198319741984MAY 1984
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01306.16.78.48.810.18.55.96.88.06.56.56.789.0
PRECIPITATION 1.00300.20.41.11.01.61.30.91.11.51.31.00.612.0
SNOWFALLNORMAL (IN)302.82.51.50.*0.00.00.00.00.00.00.41.99.1
MAXIMUM MONTHLY (IN)6012.710.114.11.7TTT0.0T0.35.611.414.1
YEAR OF OCCURRENCE19791960199419571991199419941990199319722000MAR 1994
MAXIMUM IN 24 HOURS (IN)609.06.512.91.7TTT0.0T0.34.08.812.9
YEAR OF OCCURRENCE194419931994195719911994199419941990199319721954MAR 1994
MAXIMUM SNOW DEPTH (IN)5311610T0000003811
YEAR OF OCCURRENCE198819491968199320011954JAN 1988
NORMAL NO. DAYS WITH:
SNOWFALL 1.0301.00.90.30.00.00.00.00.00.00.00.20.83.2
PRECIPITATION (inches) 2001 TULSA, OK (TUL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.170.490.914.452.432.692.685.162.957.585.001.0335.54
19733.390.7411.947.225.307.696.474.706.566.166.323.3969.88
19740.793.172.623.656.947.880.555.3011.786.407.302.8859.26
19752.613.445.452.207.226.752.143.523.341.473.533.0444.71
19760.210.843.958.276.751.874.371.172.602.650.680.5533.91
19771.431.575.582.055.726.692.004.865.572.752.310.9341.46
19780.812.842.997.149.286.060.361.370.130.955.480.7838.19
19792.070.813.974.476.158.902.684.770.282.205.600.4542.35
19802.071.323.593.447.235.570.092.343.472.050.791.3733.33
19810.691.631.671.906.703.316.222.473.116.732.250.2036.88
19823.580.671.041.289.304.131.651.422.951.224.613.3935.24
19832.951.982.193.886.851.470.580.652.119.332.140.6134.74
19841.001.956.722.4411.251.720.481.962.776.982.808.7048.77
19851.245.745.395.624.197.632.381.913.296.266.271.3951.31
19860.001.222.285.106.974.231.153.968.365.532.990.9742.76
19872.214.722.200.7010.022.314.203.723.521.275.175.8745.91
19881.111.036.523.181.170.584.202.435.371.434.381.8233.22
19892.942.263.140.343.955.164.096.693.322.800.150.2635.10
19902.934.146.515.315.211.080.241.834.192.152.412.9438.94
19911.470.381.022.585.113.640.351.176.155.121.984.5733.54
19920.481.321.374.755.658.412.123.092.663.534.835.2143.42
19932.862.764.596.863.792.422.296.901.131.691.76
19940.682.213.356.572.812.7311.394.123.603.687.101.2149.45
19950.930.571.835.9210.739.842.551.444.961.050.251.7741.84
19960.470.162.071.402.143.643.221.345.045.607.160.1032.34
19970.273.411.394.091.665.775.647.893.062.071.634.3241.20
19983.490.307.304.542.523.364.311.675.139.143.261.5846.60
19993.031.253.557.209.555.210.400.429.701.751.325.1048.48
20000.891.333.772.717.016.256.580.011.106.323.511.6241.10
20012.092.620.771.196.323.040.512.261.952.813.332.2529.14
POR=65 YRS1.571.822.863.995.524.603.222.974.213.552.682.0539.04
AVERAGE TEMPERATURE (F) 2001 TULSA, OK (TUL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197234.841.853.062.868.079.580.481.775.560.943.633.759.6
197334.039.854.358.267.576.781.279.372.365.053.438.160.0
197434.143.755.261.872.173.885.478.364.763.049.139.760.1
197539.936.945.360.469.176.081.282.269.263.250.840.159.5
197637.251.151.961.563.075.081.479.772.856.143.137.159.2
197726.946.655.064.472.681.084.881.775.662.251.139.061.7
197824.929.447.563.568.377.687.884.380.663.551.638.059.8
197923.130.252.461.068.777.883.481.874.766.247.544.459.3
198038.637.148.361.170.682.591.789.778.361.550.542.362.7
198137.643.653.368.065.980.085.979.473.960.951.438.561.5
198233.638.255.359.372.974.784.285.374.663.450.644.461.4
198339.142.949.055.467.076.684.788.177.464.552.926.760.4
198434.446.448.358.067.580.182.082.771.563.850.444.760.8
198530.235.954.763.370.675.882.981.774.663.147.834.559.6
198642.843.255.062.669.479.786.678.274.761.043.640.061.4
198736.045.451.563.274.178.981.983.172.459.351.641.461.6
198834.839.349.359.571.079.982.683.073.258.551.743.460.5
198943.431.949.363.369.274.880.280.468.764.052.731.659.1
199046.146.153.259.667.482.183.283.578.361.256.438.563.0
199134.748.355.163.873.780.084.982.972.764.345.844.662.6
199242.850.154.961.667.674.781.876.672.860.845.938.660.7
199335.737.846.855.866.076.884.483.568.656.244.542.358.2
199435.239.052.960.467.480.579.378.470.963.452.042.760.2
199539.444.251.558.365.574.182.384.670.562.848.839.460.1
199635.443.045.459.272.978.581.679.870.061.444.942.159.5
199735.944.152.455.966.975.581.778.373.962.046.039.359.3
199840.144.846.757.872.979.985.484.180.863.053.440.862.5
199939.050.048.861.568.175.484.484.669.862.357.743.462.1
200040.048.053.259.570.874.481.486.875.766.243.828.660.7
200135.341.347.166.470.678.287.485.271.962.055.243.662.0
POR=66 YRS36.741.649.960.969.077.582.781.873.362.849.340.060.5

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 TULSA, OK (TUL)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-7300191836349649547003212334204050
1973-74002495343824951591341137503311
1974-750074944737777737806102051903805
1975-76005714642976285540240712610903293
1976-770016317648858117351130999103932
1977-7800111841280112369895411106704275
1978-7900012140683412939723911644704228
1979-80000905256328128015131542203549
1980-810013172438703843598360485803233
1981-8200231784028179677473222081153680
1982-8300231464376357946114923215003509
1983-8400198937811799415335092294703924
1984-8500731304386281073809330103703591
1985-8600461115109366806023221271303347
1986-87005148632771893544413149003555
1987-88001189416727928739483187903679
1988-890082183936626639214871555303560
1989-90006712637510295805273761945403328
1990-91008172271813933459327831703083
1991-9200351215706286824233111565302979
1992-930091515658129037555562805704088
1993-9400402946116959177213871865603907
1994-9500251263906837835744362197003306
1995-9600791124807869116406042041903835
1996-9700261525947018965793932754003656
1997-980031955637917645585812251263698
1998-990001093447477984154961341803061
1999-0000381302386647704873631832322898
2000-0100261006281121914657546931804103
2001-0020142298660
COOLING DEGREE DAYS (base 65 F) 2001 TULSA, OK (TUL)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197206119914444648752433964002120
197300035124357508452249101501831
19740047482322706414197140201770
197500977156335509542192971201929
1976067285230752046125648001685
19770168424848661952532738002334
197800773180388713605476791402535
197900948167388577527298137602157
19800004320053383377441969642881
19810541459645665845229657102170
19820028442663006016373191061052316
198300340120353615725396802002352
198400025132464534556272100922094
198500195918533356452334057002080
198600206015744867641530331002110
1987002102290421532567230181902181
19880023020045455556426223102091
19890061071913004754831831051401864
1990001738137521571581416632102365
1991002953293458622562274108302402
19920056314029852636925129001681
199300179536060957915327001831
199400215513547045242421282801859
19950024269728254561825250001894
19960603727341052246318349001943
199730910106321524420278108001779
199800181626445964059848053522535
199902035118318607616190572501968
200000226211290517684353143102227
2001020139197401700630236561032374
SNOWFALL (inches) 2001 TULSA, OK (TUL)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.05.61.74.32.20.00.30.00.014.1
1973-740.00.00.00.0T1.8TTTT0.00.01.8
1974-750.00.00.00.01.7TT3.01.8T0.00.06.5
1975-760.00.00.00.00.81.3TTT0.00.00.02.1
1976-770.00.00.00.00.5T10.50.30.00.00.00.011.3
1977-780.00.00.00.0T0.05.46.3T0.00.00.011.7
1978-790.00.00.00.00.02.812.73.40.0T0.00.018.9
1979-800.00.00.00.0T0.00.43.8T0.00.00.04.2
1980-810.00.00.00.0T0.0T0.9T0.00.00.00.9
1981-820.00.00.00.00.0T0.35.6T0.00.00.05.9
1982-830.00.00.00.0TT3.81.4T0.00.00.05.2
1983-840.00.00.00.0T3.04.60.2T0.00.00.07.8
1984-850.00.00.00.00.06.63.34.30.00.00.00.014.2
1985-860.00.00.00.0T2.50.04.90.00.00.00.07.4
1986-870.00.00.00.00.00.08.74.60.00.00.00.013.3
1987-880.00.00.00.0T6.711.0T0.50.00.00.018.2
1988-890.00.00.00.00.42.73.40.39.70.00.00.016.5
1989-900.00.00.00.00.02.00.00.00.20.00.00.02.2
1990-910.00.00.00.00.04.6T1.4T0.0T0.06.0
1991-920.00.00.00.00.20.10.80.0TT0.00.01.1
1992-930.00.00.00.03.51.10.86.7TT0.00.012.1
1993-940.00.00.00.30.00.0TT14.1T0.0T14.4
1994-95T0.00.00.0T0.01.8T6.30.00.00.08.1
1995-960.00.00.00.01.8T1.05.00.00.00.00.07.8
1996-970.00.00.0TTT5.90.30.0T0.00.06.2
1997-98T0.00.00.0T0.64.00.0T0.00.00.04.6
1998-990.00.00.00.00.0T3.30.05.90.00.00.09.2
1999-000.00.00.00.00.0T7.10.02.20.00.00.09.3
2000-010.00.00.0T2.111.41.4T0.00.00.00.014.9
2001-0.00.00.00.03.0T
POR=66 YRST0.00.0T0.41.73.12.31.8TTT9.3

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