2001 Omaha (Eppley Airfield), Nebraska (OMA)

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2001 OMAHA (EPPLEY AIRFIELD), NEBRASKA (OMA)

Omaha, Nebraska, is situated on the west bank of the Missouri River. The river level at Omaha is normally about 965 feet above sea level and the rolling hills in and around Omaha rise to about 1,300 feet above sea level. The climate is typically continental with relatively warm summers and cold, dry winters. It is situated midway between two distinctive climatic zones, the humid east and the dry west. Fluctuations between these two zones produce weather conditions for periods that are characteristic of either zone, or combinations of both. Omaha is also affected by most low pressure systems that cross the country. This causes periodic and rapid changes in weather, especially during the winter months.

Most of the precipitation in Omaha falls during sharp showers or thunderstorms, and these occur mostly during the growing season from April to September. Of the total precipitation, about 75 percent falls during this six–month period. The rain occurs mostly as evening or nighttime showers and thunderstorms. Although winters are relatively cold, precipitation is light, with only 10 percent of the total annual precipitation falling during the winter months.

Sunshine is fairly abundant, ranging around 50 percent of the possible in the winter to 75 percent of the possible in the summer.

NORMALS, MEANS, AND EXTREMES

OMAHA, NE (OMA)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14942

41 18′ 37″ N  95 53′ 57″ W  GRND: 1025  BARO: 1028  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3031.337.149.463.874.083.787.985.276.565.649.334.661.5
MEAN DAILY MAXIMUM5430.836.748.563.274.283.587.785.377.066.149.136.061.5
HIGHEST DAILY MAXIMUM646978899799105114110104968372114
YEAR OF OCCURRENCE194419721986198919391953193619361939193819991939JUL 1936
MEAN OF EXTREME MAXS.5452.259.474.986.089.896.699.197.292.784.870.358.580.1
NORMAL DAILY MINIMUM3010.916.727.739.950.960.465.962.953.641.228.715.639.5
MEAN DAILY MINIMUM5411.517.327.239.851.461.266.464.053.942.128.817.240.1
LOWEST DAILY MINIMUM64-23-21-165273844432513-9-23-23
YEAR OF OCCURRENCE198219811948197519801983197219671984197219641989DEC 1989
MEAN OF EXTREME MINS.54-10.1-3.87.023.936.446.954.851.837.125.110.9-3.023.1
NORMAL DRY BULB3021.126.938.651.962.472.176.974.165.153.439.025.150.5
MEAN DRY BULB5421.127.137.751.662.872.477.074.765.554.139.026.750.8
MEAN WET BULB1620.724.633.245.156.064.865.664.058.447.034.322.744.7
MEAN DEW POINT1615.519.327.937.750.260.362.560.954.040.828.718.239.7
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.51.57.313.69.22.90.30.00.035.3
MAXIMUM 323015.210.63.50.10.00.00.00.00.00.02.212.444.0
MINIMUM 323030.226.021.06.70.40.00.00.00.45.820.229.3140.0
MINIMUM 0307.73.80.40.00.00.00.00.00.0*0.24.016.1
H/CNORMAL HEATING DEG. DAYS301361106781839816414098037278012376300
NORMAL COOLING DEG. DAYS300005842273692928312001072
RHNORMAL (PERCENT)3071716661646668717267717468
HOUR 00 LST3075777368727578808176777876
HOUR 06 LST3078797876798284868782818081
HOUR 12 LST3065635851545557595954626759
HOUR 18 LST3066645547505155586056657058
SPERCENT POSSIBLE SUNSHINE
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)652.02.01.40.70.90.40.51.61.41.51.52.216.1
THUNDERSTORMS650.10.41.64.07.49.48.47.65.12.30.80.247.3
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)494.95.05.35.15.04.63.83.83.83.84.85.04.6
MIDNIGHT-MIDNIGHT (OKTAS)224.54.54.84.74.64.43.83.73.83.84.64.74.3
MEAN NO. DAYS WITH:
CLEAR498.87.37.17.37.48.011.212.212.312.98.68.0111.1
PARTLY CLOUDY497.97.48.08.59.611.412.110.17.68.17.47.5105.6
CLOUDY4914.313.515.914.214.110.67.78.710.210.113.915.4148.6
PRMEAN STATION PRESSURE(IN)1629.0329.0328.9428.8928.8628.8628.9228.9428.9628.9928.9929.0628.96
MEAN SEA-LEVEL PRES. (IN)1230.1230.1430.0429.9429.9129.9029.9329.9830.0030.0530.0430.1530.02
WINDSMEAN SPEED (MPH)4610.810.912.112.410.89.98.88.79.39.810.910.810.4
PREVAIL. DIR (TENS OF DEGS)3133353516161616161616161616
MAXIMUM 2-MINUTE:
SPEED (MPH)545394051573756393648453957
DIR. (TENS OF DEGS)33331920163603011911283316
YEAR OF OCCURRENCE199720001999200119982000200119992000199819982000MAY 1998
MAXIMUM 5-SECOND:
SPEED (MPH)553474764864670474157554886
DIR. (TENS OF DEGS)33303019171602011911283317
YEAR OF OCCURRENCE199719992000200119981998200119992000199819981997MAY 1998
PRECIPITATIONNORMAL (IN)300.740.772.042.664.523.873.513.243.722.281.491.0229.86
MAXIMUM MONTHLY (IN)643.702.975.968.4810.3310.8110.3412.2613.755.254.705.4213.75
YEAR OF OCCURRENCE194919651973199919591947199319991965199719831984SEP 1965
MINIMUM MONTHLY (IN)64T0.090.120.230.561.030.390.610.41T0.03TT
YEAR OF OCCURRENCE198619811956193619481972198319841953195219761943JAN 1986
MAXIMUM IN 24 HOURS (IN)581.522.241.452.824.164.273.3710.486.473.132.533.0310.48
YEAR OF OCCURRENCE196719541990199919871994195819991965196819481984AUG 1999
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01306.15.98.99.711.710.29.38.69.16.96.27.199.7
PRECIPITATION 1.00300.10.10.50.61.11.21.01.01.10.50.40.17.7
SNOWFALLNORMAL (IN)306.36.35.90.70.*0.00.00.0T0.32.76.228.4
MAXIMUM MONTHLY (IN)6325.725.427.210.02.0TT0.0T7.212.019.927.2
YEAR OF OCCURRENCE19361965194819921945199419951985194119571969MAR 1948
MAXIMUM IN 24 HOURS (IN)5613.118.313.09.92.0TT0.0T7.28.710.218.3
YEAR OF OCCURRENCE19491965194819921945199419951985194119571969FEB 1965
MAXIMUM SNOW DEPTH (IN)52171827800000591727
YEAR OF OCCURRENCE1984196519601992199719571983MAR 1960
NORMAL NO. DAYS WITH:
SNOWFALL 1.0302.01.91.90.30.*0.00.00.00.00.21.02.19.4
PRECIPITATION (inches) 2001 OMAHA (EPPLEY AIRFIELD), NE (OMA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.380.361.144.635.131.037.282.604.933.213.251.6235.56
19731.440.875.963.604.941.564.981.278.042.601.431.6538.34
19740.630.160.801.722.651.790.794.172.542.741.410.8120.21
19752.011.061.783.373.724.300.461.802.160.012.850.4623.98
19760.111.392.132.983.552.841.520.621.641.350.030.2118.37
19770.930.383.723.286.052.404.698.635.054.382.900.3542.76
19780.150.761.044.615.052.195.893.876.010.961.090.5032.12
19791.110.304.592.582.842.073.363.121.230.14
19800.930.521.401.722.508.993.636.980.822.700.110.0430.34
19810.200.090.881.334.132.141.874.801.511.922.600.8622.33
19821.830.261.901.229.924.162.463.212.271.101.811.1731.31
19830.860.683.651.002.816.520.391.242.452.164.700.6327.09
19840.380.622.324.774.925.561.580.612.553.870.525.4233.12
19850.561.881.363.162.461.733.271.502.711.360.850.3721.21
1986T1.002.514.964.882.372.773.868.114.860.990.8937.20
19870.080.554.142.248.643.296.7210.161.561.331.601.0141.32
19880.420.180.141.574.681.602.681.782.630.142.550.9519.32
19891.100.860.401.800.835.053.061.806.461.550.150.7423.80
19900.590.344.010.365.083.886.360.810.811.711.151.1826.28
19911.080.262.854.464.077.792.963.671.373.763.511.7537.53
19921.411.183.083.192.271.447.311.576.862.223.011.1534.69
19931.420.932.672.264.908.0310.347.532.291.180.660.5142.72
19940.501.010.151.461.738.543.601.973.321.371.641.2126.50
19950.800.472.504.267.071.283.142.522.75
19960.832.367.572.962.392.194.901.642.460.32
19970.290.691.083.661.544.514.691.334.305.252.300.5730.21
19981.131.274.133.534.718.237.773.850.852.651.480.1339.73
19990.591.401.318.484.503.753.0712.261.640.031.110.5738.71
20000.171.950.812.852.695.525.031.300.641.933.270.9527.11
20011.611.531.382.378.782.292.061.952.392.101.550.6728.68
POR=129 YRS0.750.891.562.723.964.503.733.423.082.021.250.9028.78
AVERAGE TEMPERATURE (F) 2001 OMAHA (EPPLEY AIRFIELD), NE (OMA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197220.025.440.851.262.472.674.673.665.449.137.121.149.4
197322.628.644.350.459.473.375.577.664.257.339.822.751.3
197418.830.642.152.661.969.882.270.559.755.340.728.951.1
197522.522.431.749.466.272.578.979.762.658.241.630.951.4
197625.537.540.456.860.272.779.076.367.448.533.324.151.8
197713.333.241.659.070.275.180.672.567.453.139.726.252.7
197812.015.735.752.661.773.777.375.571.153.739.624.449.4
197910.717.339.850.061.872.776.075.766.735.830.3
198022.420.332.950.761.673.179.676.664.749.040.326.149.8
198124.128.440.857.458.672.676.671.064.850.240.622.950.7
19829.422.634.847.762.965.577.172.664.755.037.128.348.1
198324.930.137.343.556.569.679.481.567.052.238.57.349.0
198419.633.230.346.657.771.875.176.561.952.239.427.149.3
198519.123.643.454.963.467.274.169.462.152.728.516.447.9
198629.422.842.851.961.373.977.970.167.953.734.429.451.3
198728.636.842.855.367.374.277.870.964.848.343.430.953.4
198821.123.940.750.567.376.376.477.366.249.140.029.551.5
198932.416.037.954.662.469.477.474.463.053.936.217.749.6
199033.531.342.750.858.573.574.875.369.053.342.921.252.2
199116.334.242.554.267.374.675.874.366.052.130.631.851.6
199232.636.743.650.061.869.471.168.464.053.535.427.951.2
199319.522.235.647.761.470.075.175.259.750.935.029.448.5
199418.122.942.151.364.574.173.272.667.155.341.428.750.9
199523.031.539.347.958.171.878.779.6
199633.049.259.472.873.472.863.154.032.922.2
199719.029.541.645.758.073.477.273.466.554.035.329.950.3
199825.836.032.552.066.569.676.875.671.655.843.630.953.1
199922.635.539.551.662.370.880.472.863.853.347.031.052.6
200027.136.244.651.966.070.575.177.167.857.533.415.651.9
200126.621.435.055.563.571.679.075.765.053.549.432.052.4
POR=128 YRS21.926.837.851.662.672.277.375.066.254.539.227.051.0

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 OMAHA (EPPLEY AIRFIELD), NE (OMA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-736710648883113571307101463643719106380
1973-74009025475013021427955702379140316030
1974-75015191300726111513111189102446972116423
1975-76001412516951051121979175726117745347
1976-770061522947126515988835792191016085
1977-780128361754119616371375910372160176811
1978-790039350754125516761333775451156126801
1979-8016658671070131812909874401584
1980-810310849173511981259101874324122106017
1981-827385452723129917211183930518102567079
1982-8301311531582911311240971854638278376421
1983-840010240578917861401916107155224377272
1984-850318439176611661416115366632588456203
1985-86013217378108915011095117668938913416682
1986-8701540338913109611227846853226775389
1987-88132675126391048135311857484332966053
1988-891756488744109510021368844380143236151
1989-90071403568551460973935684460206156091
1990-9141753716621350150685969533810805969
1991-920012340210271022999816656449154115659
1992-93226114359881114114031192904514140346710
1993-940117144889510971448117470243212086496
1994-95058330269811161296931791507213215963
1995-961098147121122
1996-97001303479561321141798671957222606674
1997-98175739988410821207806100039052585943
1998-99002228763410501307818781396122275444
1999-00021123665351047116882862539172165162
2000-010187242940152611851214925301120206561
2001-00873604621014
COOLING DEGREE DAYS (base 65 F) 2001 OMAHA (EPPLEY AIRFIELD), NE (OMA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720003742493142801241001045
19730003232573323957422001106
19740001152182540193394001021
197500071152424414647644001389
1976000213424044035813917001249
1977000451793104892361050001364
19780075672873863332315001321
197900086424934434512200
198000015612544593681070001264
1981000242923537219685000941
1982000543783832521131200886
198300002018345351916717001359
1984000622220320366964001034
19850003044116290156137100774
198600105262764081811330001039
198700039145292407221692101176
19880005109351364394993001325
1989001077681593953068919001123
199000041927731632719912401185
1991005211842953452951619001315
1992000763150198136901100655
1993000035188322324211900909
1994000281082872622481519001093
199500008230431458
19960846264266250791400
199700001826038827311062001111
199800161082053733362279001265
19990000432084842488412001079
2000000211018831738517918001199
200100027802254393429310101217
SNOWFALL (inches) 2001 OMAHA (EPPLEY AIRFIELD), NE (OMA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0T9.75.915.84.6T2.30.00.038.3
1973-740.00.00.00.04.110.711.52.44.20.80.00.033.7
1974-750.00.00.00.05.48.122.711.95.14.60.00.057.8
1975-760.00.00.00.06.30.61.87.14.20.00.00.020.0
1976-770.00.00.01.40.52.814.40.13.71.60.00.024.5
1977-780.00.00.00.0T4.01.417.06.5T0.00.028.9
1978-790.00.00.00.02.05.610.01.46.01.10.00.026.1
1979-800.00.00.02.0T1.35.03.09.2T0.00.020.5
1980-810.00.00.02.0T0.53.63.0T0.00.00.09.1
1981-820.00.00.0T1.07.02.43.08.02.90.00.024.3
1982-830.00.00.0TT4.06.59.09.03.00.00.031.5
1983-840.00.00.00.06.913.53.32.014.2T0.00.039.9
1984-850.00.00.0TT5.04.04.06.0T0.00.019.0
1985-860.00.0T0.05.04.5T7.7T0.30.00.017.5
1986-870.00.00.00.01.85.51.21.610.5T0.00.020.6
1987-880.00.00.0T9.02.02.02.20.80.00.00.016.0
1988-890.00.00.00.04.32.71.411.83.3TT0.023.5
1989-900.00.00.0T1.25.35.24.06.70.10.0T22.5
1990-910.00.00.0T1.110.114.90.34.11.10.0T31.6
1991-920.00.00.02.58.8T0.31.10.410.00.00.023.1
1992-930.00.00.00.05.83.913.08.54.11.50.0T36.8
1993-940.00.00.0T2.83.13.58.81.41.20.0T20.8
1994-950.00.00.00.02.012.15.53.04.80.4T0.027.8
1995-96T0.00.0
1996-976.2T
1997-98
1998-994.06.012.25.80.40.00.0
1999-00T4.11.67.7TT0.0T
2000-010.00.00.00.02.718.16.910.40.7TTT38.8
2001-0.00.00.0TT1.8
POR=62 YRST0.0T0.32.65.77.16.75.91.00.1T29.4

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