2001 Louisville, Kentucky (SDF)

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2001 LOUISVILLE, KENTUCKY (SDF)

Louisville is located on the south bank of the Ohio River, 604 miles below Pittsburgh, Pennsylvania, and 377 miles above the mouth of the river at Cairo, Illinois. The city is divided by Beargrass Creek and its south fork into two portions with entirely different types of topography. The eastern portion is rolling, containing several creeks, and consists of plateaus and rolling hillsides. The highest elevation in this area is 565 feet. The western portion is mostly flat with an average elevation about 100 feet lower than the eastern area. Much of the western section lies in the flood plain of the Ohio River. Nearly all of the industries in the city are located in the western portion, while the eastern portion is almost entirely residential. A range of low hills about five miles northwest of Louisville, on the Indiana side of the Ohio River, present a partial barrier to arctic blasts in the winter months. During colder months, snow is frequently observed on the summits of these hills when there is no snow in the city of Louisville or in riverside communities on the Indiana side of the Ohio River.

The climate of Louisville, while continental in type, is of a variable nature because of its position with respect to the paths of high and low pressure systems and the occasional influx of warm moist air from the Gulf of Mexico. In winter and summer there are occasional cold and hot spells of short duration. As a whole, winters are moderately cold and summers are quite warm. Temperatures of 100 degrees or more in summer and zero degrees or less in winter are rare.

Thunderstorms with high rainfall intensities are common during the spring and summer months. The precipitation in Louisville is nonseasonal and varies from year to year. The fall months are usually the driest. Generally, March has the most rainfall and October the least. Snowfall usually occurs from November through March. As with rainfall, amounts vary from year to year and month to month. Some snow has also been recorded in the months of October and April. Mean total amounts for the months of January, February, and March are about the same with January showing a slight edge in total amount. Relative humidity remains rather high throughout the summer months. Cloud cover is about equally distributed throughout the year with the winter months showing somewhat of an increase in amount. The percentage of possible sunshine at Louisville varies from month to month with the greatest amount during the summer months as a result of the decreasing sky cover during that season. Heavy fog is unusual and there is only an average of 10 days during the year with heavy fog and these occur generally in the months of September through March.

The average date for the last occurrence in the spring of temperatures as low as 32 degrees is mid–April, and the first occurrence in the fall is generally in late October.

The prevailing direction of the wind has a southerly component and the velocity averages under 10 mph. The strongest winds are usually associated with thunderstorms.

NORMALS, MEANS, AND EXTREMES

LOUISVILLE, KY (SDF)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 93821

38 10′ 38″ N  85 43′ 47″ W  GRND: 481  BARO: 484  EASTERN (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3040.344.856.367.376.083.587.085.780.369.256.845.166.0
MEAN DAILY MAXIMUM5141.446.355.767.676.484.588.187.080.569.356.145.466.5
HIGHEST DAILY MAXIMUM547777869195102106101104928476106
YEAR OF OCCURRENCE195020001981196019591952199919881954195919581982JUL 1999
MEAN OF EXTREME MAXS.5464.267.977.484.488.693.894.093.790.684.274.966.181.7
NORMAL DAILY MINIMUM3023.226.536.245.454.762.967.365.858.745.837.328.646.0
MEAN DAILY MINIMUM5124.828.135.945.855.264.066.965.357.946.837.429.146.4
LOWEST DAILY MINIMUM54-22-19-122314200023-1-15-22
YEAR OF OCCURRENCE199419511960198219661966199619961996195219501989JAN 1994
MEAN OF EXTREME MINS.543.68.619.330.240.151.256.454.742.831.420.89.730.7
NORMAL DRY BULB3031.735.746.356.365.373.277.275.869.557.647.136.956.0
MEAN DRY BULB5433.437.345.756.766.074.278.276.769.758.246.637.356.7
MEAN WET BULB4930.033.440.349.558.866.870.369.062.852.041.833.850.7
MEAN DEW POINT4923.927.133.242.553.762.766.565.258.547.036.128.245.4
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.0*0.45.911.09.23.00.00.00.029.5
MAXIMUM 32309.25.10.60.00.00.00.00.00.00.00.34.519.7
MINIMUM 323024.419.911.82.30.10.00.00.00.01.68.920.389.3
MINIMUM 0301.40.20.00.00.00.00.00.00.00.00.00.42.0
H/CNORMAL HEATING DEG. DAYS301032820580273105600362545378714514
NORMAL COOLING DEG. DAYS300001211525237833517125001288
RHNORMAL (PERCENT)3069686462676971727370697069
HOUR 01 LST3072726968778081828379747376
HOUR 07 LST3076777576828385878885797781
HOUR 13 LST3063625652555658585855606458
HOUR 19 LST3064625652565860616362646760
SPERCENT POSSIBLE SUNSHINE4841495156616768676561464056
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)540.90.90.50.20.30.30.50.91.01.50.70.88.5
THUNDERSTORMS540.91.13.14.66.97.68.36.93.41.71.50.646.6
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)13.2
MIDNIGHT-MIDNIGHT (OKTAS)13.2
MEAN NO. DAYS WITH:
CLEAR11.03.04.03.08.01.0
PARTLY CLOUDY12.01.0
CLOUDY11.04.06.03.01.03.04.02.0
PRMEAN STATION PRESSURE (IN)2829.6129.5729.4929.4729.4629.4629.4929.5229.5429.5729.5729.5929.53
MEAN SEA-LEVEL PRES. (IN)4830.1430.1030.0329.9929.9829.9830.0030.0230.0530.0930.0930.1330.05
WINDSMEAN SPEED (MPH)499.69.610.19.88.07.46.96.46.87.29.09.18.3
PREVAIL. DIR (TENS OF DEGS)3228303119181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)738444056405437473840444056
DIR. (TENS OF DEGS)21232022230421212729232722
YEAR OF OCCURRENCE199919991997199919961998199919992001200119982000APR 1999
MAXIMUM 5-SECOND:
SPEED (MPH)743514756536044564446494960
DIR. (TENS OF DEGS)26232024220434222731222704
YEAR OF OCCURRENCE200019991998199919961998200119992001200119982000JUN 1998
PRECEPITATIONNORMAL (IN)302.863.304.664.234.623.464.513.543.162.713.703.6444.39
MAXIMUM MONTHLY (IN)5411.389.0214.9111.1011.5710.1110.058.7910.496.479.128.8614.91
YEAR OF OCCURRENCE195019891964197019901960197919741979198319571990MAR 1964
MINIMUM MONTHLY (IN)540.450.761.020.761.370.490.340.230.010.390.720.650.01
YEAR OF OCCURRENCE198119781966197619771984199919531995198719761976SEP 1995
MAXIMUM IN 24 HOURS (IN)543.993.667.224.854.605.145.463.134.973.253.582.797.22
YEAR OF OCCURRENCE200019901997197019611960197919921979197719481978MAR 1997
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013010.310.513.111.411.89.610.78.68.47.710.711.9124.7
PRECIPITATION 1.00300.50.81.01.01.10.91.00.80.60.61.00.910.2
SNOWFALLNORMAL (IN)305.95.03.10.2T0.00.00.00.00.*1.02.217.4
MAXIMUM MONTHLY (IN)5428.419.322.91.6TTTT0.02.413.29.728.4
YEAR OF OCCURRENCE19781998196019731989199319941999199319662000JAN 1978
MAXIMUM IN 24 HOURS (IN)5415.911.012.11.6TTTT0.02.413.05.015.9
YEAR OF OCCURRENCE19941966196819731989199319941999199319661961JAN 1994
MAXIMUM SNOW DEPTH (IN)50191111200000T8519
YEAR OF OCCURRENCE1978196619681987198919661984JAN 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0301.71.30.70.10.00.00.00.00.00.*0.30.74.8
PRECIPITATION (inches) 2001 LOUISVILLE, KY (SDF)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19722.873.944.078.484.461.083.642.454.242.556.315.2949.38
19731.961.606.265.777.046.209.380.912.342.287.592.6453.97
19744.381.645.412.743.862.582.048.793.522.093.032.8542.93
19754.874.539.656.474.503.151.913.892.646.123.694.8956.31
19763.853.132.870.765.094.712.103.183.103.990.720.6534.15
19772.331.454.693.401.377.593.296.123.674.766.114.3249.10
19785.900.763.763.334.762.673.775.500.962.265.147.6446.45
19793.814.492.717.323.593.0310.052.3710.492.275.853.8259.80
19801.711.094.802.634.583.705.413.763.173.372.421.2537.89
19810.453.231.544.444.633.233.983.213.221.602.402.0233.95
19825.281.555.893.052.963.863.723.743.461.265.505.1145.38
19831.631.522.167.1010.584.420.992.391.136.475.033.9647.38
19840.921.684.415.536.780.496.945.083.702.125.875.8649.38
19852.202.084.431.693.934.373.454.491.484.244.430.9637.75
19860.913.902.691.044.282.327.042.192.753.084.622.6937.51
19870.814.423.052.351.613.585.312.661.150.392.624.7032.65
19884.003.582.973.522.680.874.683.001.481.545.763.4537.53
19893.689.025.504.934.395.266.902.202.422.652.571.4550.97
19903.906.722.783.4611.576.131.963.212.573.972.348.8657.47
19913.293.724.792.614.021.232.993.352.742.311.875.2338.15
19921.971.745.882.663.513.046.514.713.500.964.711.6040.79
19933.504.205.203.572.804.054.585.743.904.033.262.5647.39
19944.082.963.905.322.121.852.501.582.901.963.573.2435.98
19953.202.002.172.649.482.843.394.070.015.422.393.2840.89
19964.442.034.995.659.183.841.315.662.593.354.56
19973.353.3912.582.016.018.111.743.701.281.413.632.5049.71
19982.882.884.076.694.535.736.892.921.002.762.743.2446.33
19997.232.203.473.043.126.360.340.971.742.461.614.8137.35
20006.225.803.562.952.913.883.502.875.360.892.974.3145.22
20011.463.422.271.045.192.614.473.424.086.395.164.4843.99
POR=129 YRS3.783.384.523.894.083.863.793.282.812.633.513.6143.14
AVERAGE TEMPERATURE (F) 2001 LOUISVILLE, KY (SDF)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197235.234.944.856.265.570.677.176.172.355.344.039.155.9
197335.036.453.754.461.575.678.477.073.662.349.837.157.9
197439.839.349.857.265.168.775.975.063.254.947.039.156.3
197538.140.243.354.469.075.477.779.366.259.450.638.957.7
197631.345.452.457.562.972.976.874.266.852.539.533.155.4
197718.636.951.760.371.273.980.277.572.555.549.634.656.9
197822.923.841.758.063.875.778.577.173.755.550.040.055.1
197924.628.048.355.064.273.975.376.169.458.246.939.254.9
198033.529.641.853.666.873.481.581.073.555.846.338.356.3
198130.438.845.762.462.976.278.876.167.756.547.433.856.4
198228.634.947.151.370.369.378.073.566.859.048.744.956.0
198334.737.546.751.762.173.481.181.771.059.147.828.456.3
198428.941.540.455.062.677.775.576.067.263.944.045.956.6
198525.432.850.260.366.572.177.274.869.261.453.730.456.2
198634.539.948.358.567.075.780.374.373.159.545.936.757.8
198733.739.547.955.471.576.278.978.271.252.650.840.258.0
198831.034.746.157.067.175.680.380.070.152.347.838.056.7
198941.634.048.456.762.673.578.176.669.458.446.725.355.9
199043.144.351.255.564.275.178.577.571.858.752.040.859.4
199134.140.549.460.373.178.381.379.271.761.545.041.459.7
199237.143.747.958.263.972.178.573.269.158.147.938.657.4
199338.534.044.054.966.874.582.079.068.055.945.836.556.7
199426.838.045.459.963.077.579.076.168.759.452.242.457.4
199535.636.249.557.765.674.979.782.268.759.241.735.257.2
199632.437.741.053.668.574.658.941.840.9
199732.342.249.552.661.472.278.775.470.358.843.937.256.2
199842.443.648.156.270.375.078.378.876.262.651.342.060.4
199936.842.643.059.367.676.383.278.572.158.953.539.159.2
200034.445.151.455.869.275.076.877.168.061.444.626.257.1
200133.041.143.062.368.673.878.879.168.858.953.542.658.6
POR=129 YRS34.237.045.856.566.074.677.876.269.858.746.837.156.7

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 LOUISVILLE, KY (SDF)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73001629862879392779634934312904279
1973-74001314445086077271448725799193815
1974-75001223145437948306886653332204311
1975-760073205431801104056240526611113895
1976-77002939375798214357804211833675023
1977-780062954729351294114572022114215231
1978-79004293442765124610305143019454694
1979-80001924453479296910217133426884710
1980-810012309555821106572859514212204349
1981-82006126852396011248375494081334746
1982-83015624649562493376357139912154214
1983-8400541965091128111567375731514104888
1984-85007384623584122289645818052164188
1985-86005316034710679416965162246904073
1986-8701252105708699627065262942104175
1987-8800937742376210488725802443874360
1988-89001339851083372086051329115644298
1989-900049230539122267257444532082134146
1990-9100342293877459496774821672703697
1991-92005216859072585561052324412483899
1992-93004021950581381985964429944184260
1993-940048289572875118075260218912234632
1994-9500201863846969048004712367203769
1995-96004819269391510027827383536624791
1996-97202689741100563447236614012
1997-9800926362185469659456126127153901
1998-990001194057118666206761831603596
1999-0000201973467969425754162702623590
2000-01006017460811989806646741753184572
2001-0052224339689
COOLING DEGREE DAYS (base 65 F) 2001 LOUISVILLE, KY (SDF)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197200325811933863512422401287
1973007292832542238028071201544
19740022311091363453197581001055
19750002415232040245111636501506
1976002147512433722949210001130
197700145023428147939623852001717
1978000201103234253832706201539
1979005107327932635015439001236
1980000813426651950427631101739
1981005686334343534815010001422
19820012183139408274118681381214
198300783926450452424019001605
1984000206938633334914556011359
198502848106233387311185551401349
19860053713833048130625546001598
1987000142323424394162031401651
19880041011133348147217310001594
1989006488826441236418830001400
19900022446532342739224442701566
19910083128640651444526268002020
19920024810022942426216914001248
1993000410631053444214612301557
1994000426338444334913821401444
19950002910030446654416521001629
1996000181832981900
199700023523743533017479001292
19980044420032141643634552071825
19990001810334557342723812601722
2000052016230837538515668201463
200100010315028043344517440101626
SNOWFALL (inches) 2001 LOUISVILLE, KY (SDF)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.02.02.21.11.10.51.60.00.08.5
1973-740.00.00.00.00.04.51.00.92.8T0.00.09.2
1974-750.00.00.00.01.01.23.01.310.0T0.00.016.5
1975-760.00.00.00.00.10.72.50.10.70.00.00.04.1
1976-770.00.00.00.01.61.119.60.80.10.80.00.024.0
1977-780.00.00.00.04.82.228.45.39.4T0.00.050.1
1978-790.00.00.00.00.0T8.510.90.9T0.00.020.3
1979-800.00.00.00.00.1T10.73.63.9T0.00.018.3
1980-810.00.00.0TTT2.50.30.10.00.00.02.9
1981-820.00.00.00.00.13.62.72.90.31.40.00.011.0
1982-830.00.00.00.0T0.00.64.50.1T0.00.05.2
1983-840.00.00.00.00.00.63.18.81.00.00.00.013.5
1984-850.00.00.00.0T4.87.46.7TT0.00.018.9
1985-860.00.00.00.00.01.61.18.80.10.00.00.011.6
1986-870.00.00.00.0TT2.26.79.3T0.00.018.2
1987-880.00.00.00.0TT3.05.00.50.00.00.08.5
1988-890.00.00.00.0T0.3T0.6T0.0T0.00.9
1989-900.00.00.01.4T6.51.90.84.1T0.00.014.7
1990-910.00.00.00.00.04.10.31.50.20.00.00.06.1
1991-920.00.00.00.00.50.10.90.10.90.70.00.03.2
1992-930.00.00.00.00.91.0T15.91.1T0.0T18.9
1993-940.00.00.02.4T3.617.71.54.7T0.00.029.9
1994-95T0.00.00.00.0T0.12.81.10.00.00.04.0
1995-960.00.00.00.0T1.113.81.38.0T
1996-970.0T0.43.01.9TT0.00.0
1997-980.00.00.00.00.41.9T19.31.2TT0.022.8
1998-990.00.00.00.00.02.85.53.71.30.00.0T13.3
1999-000.0T0.00.00.04.96.70.10.3T0.00.012.0
2000-010.00.00.00.0T9.74.80.3TT0.00.014.8
2001-0.00.00.0T0.00.6
POR=54 YRST0.00.00.1T2.35.34.43.0TTT15.1

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