2001 Columbus, Ohio (CMH)

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2001 COLUMBUS, OHIO (CMH)

Columbus is located in the center of the state and in the drainage area of the Ohio River. The airport is located at the eastern boundary of the city approximately 7 miles from the center of the business district.

Four nearly parallel streams run through or adjacent to the city. The Scioto River is the principal stream and flows from the northwest into the center of the city and then flows straight south toward the Ohio River. The Olentangy River runs almost due south and empties into the Scioto just west of the business district. Two minor streams run through portions of Columbus or skirt the eastern and southern fringes of the area. They are Alum Creek and Big Walnut Creek. Alum Creek empties into the Big Walnut southeast of the city and the Big Walnut empties into the Scioto a few miles downstream. The Scioto and Olentangy are gorge–like in character with very little flood plain and the two creeks have only a little more flood plain or bottomland.

The narrow valleys associated with the streams flowing through the city supply the only variation in the micro–climate of the area. The city proper shows the typical metropolitan effect with shrubs and flowers blossoming earlier than in the immediate surroundings and in retarding light frost on clear quiet nights. Many small areas to the southeast and to the north and northeast show marked effects of air drainage as evidenced by the frequent formation of shallow ground fog at daybreak during the summer and fall months and the higher frequency of frost in the spring and fall.

The average occurrence of the last freezing temperature in the spring within the city proper is mid–April, and the first freeze in the fall is very late October, but in the immediate surroundings there is much variation. For example, at Valley Crossing located at the southeastern outskirts of the city, the average occurrence of the last 32 degree temperature in the spring is very early May, while the first 32 degree temperature in the fall is mid–October.

The records show a high frequency of calm or very low wind speeds during the late evening and early morning hours, from June through September. The rolling landscape is conducive to air drainage and from the Weather Service location at the airport the air drainage is toward the northwest with the wind direction indicated as southeast. Air drainage takes place at speeds generally 4 mph or less and frequently provides the only perceptible breeze during the night.

Columbus is located in the area of changeable weather. Air masses from central and northwest Canada frequently invade this region. Air from the Gulf of Mexico often reachs central Ohio during the summer and to a much lesser extent in the fall and winter. There are also occasional weather changes brought about by cool outbreaks from the Hudson Bay region of Canada, especially during the spring months. At infrequent intervals the general circulation will bring showers or snow to Columbus from the Atlantic. Although Columbus does not have a wet or dry season as such, the month of October usually has the least amount of precipitation.

NORMALS, MEANS, AND EXTREMES

COLUMBUS, OH (CMH)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14821

39 59′ 29″ N  82 52′ 51″ W  GRND:  846  BARO:  849  EASTERN (UTC + 5)

ELEMENTPROJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3034.138.050.562.072.380.483.782.176.264.551.439.261.2
MEAN DAILY MAXIMUM5435.939.949.962.572.981.785.083.476.965.351.539.962.1
HIGHEST DAILY MAXIMUM627475858994102100101100908076102
YEAR OF OCCURRENCE195020001945194819411944199919831951195119871982JUN 1944
MEAN OF EXTREME MAXS.5458.162.373.981.987.592.994.392.989.981.871.461.879.1
NORMAL DAILY MINIMUM3018.521.231.240.050.158.062.760.854.842.934.324.641.6
MEAN DAILY MINIMUM5420.322.930.740.550.559.563.862.054.643.234.125.042.3
LOWEST DAILY MINIMUM62-22-13-6142535433931205-17-22
YEAR OF OCCURRENCE199419771984198219661972197219651963196219761989JAN 1994
MEAN OF EXTREME MINS.54-1.53.012.824.835.545.551.649.638.127.917.84.825.8
NORMAL DRY BULB3026.429.640.951.061.269.273.271.565.553.742.931.951.4
MEAN DRY BULB5428.231.440.451.561.870.574.472.865.754.342.832.452.2
MEAN WET BULB1727.330.136.446.155.864.067.866.359.649.139.830.847.8
MEAN DEW POINT1722.224.429.439.250.359.263.462.455.243.834.426.242.5
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.53.55.93.41.20.00.00.014.5
MAXIMUM 323013.69.42.40.10.00.00.00.00.00.01.18.935.5
MINIMUM 323027.223.518.36.90.70.00.00.00.14.113.623.9118.3
MINIMUM 0303.01.60.10.00.00.00.00.00.00.00.00.95.6
H/CNORMAL HEATING DEG. DAYS301197991747420187230128136166310265708
NORMAL COOLING DEG. DAYS30000069149258214961100797
RHNORMAL (PERCENT)3071706462666871737369727469
HOUR 01 LST3074737070778082848378767777
HOUR 07 LST3076767475798184878782807980
HOUR 13 LST3067645652545556585855636959
HOUR 19 LST3069666054565860636564697363
SPERCENT POSSIBLE SUNSHINE4536424450566060606156373149
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)521.91.61.10.60.90.91.11.61.71.41.21.615.6
THUNDERSTORMS620.40.62.04.16.38.08.06.13.01.31.00.341.1
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)476.26.15.95.65.35.04.84.64.54.55.86.25.4
MIDNIGHT-MIDNIGHT (OKTAS)326.05.55.55.14.84.74.44.34.34.35.66.05.0
MEAN NO. DAYS WITH:
CLEAR12.0
PARTLY CLOUDY16.0
CLOUDY123.0
PRMEAN STATION PRESSURE(IN)2829.2029.1929.1029.1029.1029.1029.1029.2029.1929.2029.2029.1929.16
MEAN SEA-LEVEL PRES. (IN)1730.1230.1130.0629.9829.9929.9730.0230.0530.0630.1130.1230.1430.06
WINDSMEAN SPEED (MPH)429.79.410.09.58.06.96.35.86.37.28.99.18.1
PREVAIL. DIR (TENS OF DEGS)2727272836181918363618181818
MAXIMUM 2-MINUTE:
SPEED (MPH)640414347473647434440454747
DIR. (TENS OF DEGS)24242126262233292324272222
YEAR OF OCCURRENCE200020011996199620012000199719961999199619962001DEC 2001
MAXIMUM 5-SECOND:
SPEED (MPH)652535158555260566152565961
DIR. (TENS OF DEGS)24182326262328292325252623
YEAR OF OCCURRENCE200019971996199620011996199719961999200119982000SEP 1999
PRECIPITATIONNORMAL (IN)302.182.243.273.213.934.044.313.722.962.153.222.8638.09
MAXIMUM MONTHLY (IN)628.295.159.596.519.119.7512.368.636.765.2410.676.9812.36
YEAR OF OCCURRENCE195019901964199819681958199219791979195419851990JUL 1992
MINIMUM MONTHLY (IN)620.530.290.610.670.950.650.480.580.510.110.600.460.11
YEAR OF OCCURRENCE194419781941197119771999194019511963196319761955OCT 1963
MAXIMUM IN 24 HOURS (IN)544.812.153.402.372.722.935.163.794.862.212.472.565.16
YEAR OF OCCURRENCE195919751964195719681958199219721979198619851998JUL 1992
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013012.811.113.812.412.310.510.910.08.49.311.713.5136.7
PRECIPITATION 1.00300.20.30.30.60.81.11.11.00.70.30.70.37.4
SNOWFALLNORMAL (IN)309.27.04.41.10.*0.00.00.0T0.11.95.329.0
MAXIMUM MONTHLY (IN)5334.416.413.512.60.8TT0.0T4.615.217.334.4
YEAR OF OCCURRENCE19781979196219871989199519951994199319501960JAN 1978
MAXIMUM IN 24 HOURS (IN)538.88.98.612.30.8TT0.0T4.68.28.712.3
YEAR OF OCCURRENCE19961971196219871989199519951994199319501960APR 1987
MAXIMUM SNOW DEPTH (IN)521713910000000131017
YEAR OF OCCURRENCE197819791984198719501960JAN 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0303.02.41.40.20.00.00.00.00.00.*0.61.99.5
PRECIPITATION (inches) 2001 COLUMBUS, OH (CMH)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.401.742.863.746.563.982.607.965.131.744.403.4945.60
19732.461.293.433.723.368.774.074.972.823.295.372.7046.25
19742.402.304.382.663.295.041.144.883.321.513.392.6836.99
19753.213.474.102.713.173.532.044.515.462.291.543.0139.04
19763.152.032.171.441.414.525.125.082.542.860.600.9331.85
19771.571.023.884.040.954.022.524.763.482.573.773.5436.12
19785.890.292.983.024.153.651.815.231.162.391.565.0137.14
19793.322.881.014.013.274.238.068.636.761.263.911.8349.17
19801.691.383.771.594.565.174.586.261.862.532.071.9637.42
19810.704.601.115.386.505.734.141.412.281.401.652.8837.78
19824.771.493.991.904.683.373.901.024.250.925.193.8439.32
19831.200.741.695.585.064.592.802.231.914.455.003.1638.41
19841.071.973.893.104.930.713.152.961.482.914.412.8433.42
19851.311.673.780.734.961.416.882.341.181.9310.671.8138.67
19861.542.962.611.312.475.533.601.613.444.163.002.8135.04
19871.140.592.042.022.853.603.892.961.531.571.632.8826.70
19882.144.262.542.242.271.347.802.683.521.703.592.4936.57
19891.973.104.163.304.696.366.794.302.162.492.651.7943.76
19902.435.151.322.827.015.258.001.865.265.052.036.9853.16
19911.972.303.974.152.472.812.142.024.051.761.313.7932.74
19921.790.853.402.833.402.3312.363.752.141.404.031.3239.60
19934.141.823.504.492.473.335.950.741.753.054.452.1637.85
19943.791.561.943.641.691.936.023.291.680.922.942.2231.62
19954.541.641.613.174.865.306.997.561.154.042.471.9745.30
19963.732.143.406.395.813.825.091.585.501.443.203.4645.56
19972.191.503.961.655.586.622.915.761.361.582.922.1338.16
19982.322.481.886.513.096.992.751.991.273.051.993.2537.57
19992.872.771.884.651.800.653.022.401.911.001.952.6927.59
20003.532.792.704.155.423.504.104.104.182.702.133.5942.89
20011.311.371.033.397.032.304.664.141.603.323.693.0136.85
POR=123 YRS2.862.423.793.233.743.713.893.212.602.192.782.6437.06
AVERAGE TEMPERATURE (F) 2001 COLUMBUS, OH (CMH)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197228.227.737.048.860.863.671.970.164.649.640.536.149.9
197331.231.450.451.159.572.674.374.268.958.645.133.754.3
197433.231.244.654.360.867.774.474.062.252.844.534.052.8
197532.533.437.346.766.672.475.177.362.754.747.533.553.3
197624.037.446.550.958.170.572.068.361.747.533.924.849.6
197711.426.545.654.866.867.576.272.068.252.045.129.551.3
197819.016.634.550.659.670.473.573.269.851.544.434.449.8
197921.419.344.350.160.569.671.871.965.153.343.635.150.5
198029.325.237.249.562.467.475.975.968.350.840.832.551.3
198123.334.040.255.859.570.971.970.462.351.140.930.650.9
198221.229.240.446.466.865.874.469.263.556.245.440.451.6
198329.934.043.348.457.669.476.776.267.154.544.024.852.2
198423.337.432.350.057.673.171.272.963.159.440.639.551.7
198521.726.043.756.362.666.972.771.266.657.348.226.051.6
198630.132.742.554.564.370.675.771.069.256.341.333.353.5
198729.934.944.352.166.072.776.674.366.949.147.635.754.2
198826.529.340.250.362.669.677.575.365.247.443.931.651.6
198936.628.742.048.257.268.873.971.265.254.242.119.850.7
199037.737.545.350.759.170.373.672.566.455.146.237.254.3
199129.735.743.956.170.975.077.675.066.255.941.036.455.3
199232.236.840.751.859.967.373.569.464.751.944.834.752.3
199334.327.838.650.362.269.876.275.764.953.043.532.952.4
199421.330.039.553.958.473.975.271.765.455.548.238.852.7
199529.427.943.650.860.972.976.078.464.256.137.728.852.2
199627.830.535.650.260.972.372.874.065.855.037.537.151.6
199728.136.342.748.456.670.274.270.365.155.240.134.751.8
199837.640.543.653.167.371.774.876.371.655.745.938.156.4
199931.137.137.555.064.874.580.273.167.955.347.534.654.9
200027.037.545.951.464.971.672.571.364.857.241.023.352.4
200128.735.338.156.863.671.174.375.264.455.849.638.454.3
POR=123 YRS29.031.140.251.261.970.774.872.866.454.742.532.552.3

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 COLUMBUS, OH (CMH)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73221877473727889104193444442718405236
1973-740335219589963977940628332178314895
1974-750013037460995499987885054273185427
1975-7600110321520973126379157044022945221
1976-7712511853792512411659107160132491646657
1977-7811736394594109114201346938424223236507
1978-79003841161094313461270637449185185907
1979-8011168337663292010991148855458133535784
1980-81004643571710001286864761287195145605
1981-82851414297131061135199775855645336097
1982-833191073045857591081863669493239305152
1983-84608332562612361284796100744725436067
1984-856314318272778213391086654286134355377
1985-86029624950012021076901694328113195180
1986-8702641287702974108383863739310395093
1987-88045348952190011871029762433119495546
1988-89375754762410328731009711499274285664
1989-90011903456801394840766613444190265399
1990-91038331055885710898176492824204690
1991-92001052967148781011814747402190355192
1992-93081014036009329421034811434130515446
1993-9401843666379891351973787340233125773
1994-9508512954978051098103165742715065025
1995-96007827481011121147992905448191115968
1996-9720743078218591136798687494264155457
1997-980106334674193384367968135238414727
1998-99002229256782910457768482996894755
1999-000046295517936117278958640384214849
2000-01131042567171285111782282628992245536
2001-2097297455815
COOLING DEGREE DAYS (base 65 F) 2001 COLUMBUS, OH (CMH)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720001246724518371000591
1973003141723629529216025001042
1974004205811729628652300836
197500011302483203894810101147
1976003232317422313525200608
1977008241511483542421390701073
1978000059190270261188000968
1979000754163230239932200808
19800000611323433441513001034
1981000163219823118164400726
1982000411166301154673974753
19830012171673773551529001080
1984000830253205254941400858
19850023264972452011521920814
1986002199519433922117125001066
1987000111422463662991160501185
1988000054194396333705001052
19890052401492822111061200807
199000112113191273244133930898
19910002123230740231714723001449
1992000133711527215299200690
1993000048204352343892001038
1994000153928632222471800965
1995000632251347424614001125
19960001172238251285102200961
1997000010181291182734800785
19980027011824831335722710031303
19990004693014762581390001247
20000002872252392091051800885
200100050562152993248519001048
SNOWFALL (inches) 2001 COLUMBUS, OH (CMH)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0T6.32.84.41.82.17.10.00.024.5
1973-740.00.00.00.0T6.42.35.04.50.30.00.018.5
1974-750.00.00.0T0.37.48.13.72.6T0.00.022.1
1975-760.00.00.00.01.12.912.41.81.0T0.00.019.2
1976-770.00.00.0T3.14.618.16.70.30.10.00.032.9
1977-780.00.00.00.02.27.534.44.55.5T0.00.054.1
1978-790.00.00.0T1.31.817.316.40.80.30.00.037.9
1979-800.00.00.00.00.10.27.08.11.2T0.00.016.6
1980-810.00.00.0T8.07.37.83.73.30.00.00.030.1
1981-820.00.00.00.01.99.811.83.73.24.70.00.035.1
1982-830.00.00.00.0T1.52.64.52.80.10.00.011.5
1983-840.00.00.00.00.55.79.010.89.80.30.00.036.1
1984-850.00.00.00.00.97.321.912.5T0.80.00.043.4
1985-860.00.00.00.00.08.64.89.81.8T0.00.025.0
1986-870.00.00.00.00.40.42.71.25.912.60.00.023.2
1987-880.00.00.0T0.64.68.46.53.8T0.00.023.9
1988-890.00.00.0T0.85.90.63.96.60.10.80.018.7
1989-900.00.00.00.40.39.43.36.01.40.40.0T21.2
1990-910.00.00.00.00.03.73.44.54.0T0.00.015.6
1991-920.00.00.0T0.61.612.21.81.61.10.00.018.9
1992-930.00.00.0T3.02.41.514.68.90.20.00.030.6
1993-940.00.00.04.60.84.219.52.94.61.10.0T37.7
1994-95T0.0T0.00.00.312.65.32.5T0.0T20.7
1995-96T0.00.00.02.711.824.54.37.63.20.0
1996-971.9
1997-980.92.91.22.22.8T0.0T
1998-990.00.00.00.00.02.820.67.39.80.00.00.040.5
1999-000.00.00.00.01.54.613.87.91.90.10.00.029.8
2000-01T0.00.00.01.313.46.33.41.10.8T0.026.3
2001-0.00.00.0T0.01.7
POR=52 YRST0.0T0.12.25.48.75.94.31.00.1T27.7

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