2001 Indianapolis, Indiana (IND)

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2001 INDIANAPOLIS, INDIANA (IND)

Indianapolis is located in the central part of the state and is situated on level or slightly rolling terrain. The greater part of the city lies east of the White River which flows in a general north to south direction.

The National Weather Service Forecast Office is located approximately 7 miles southwest of the central part of the city at the Indianapolis International Airport. From a field elevation of 797 feet above sea level at the Indianapolis International Airport the terrain slopes gradually downward to a little below 645 feet at the White River, then upward to just over 910 feet in the northwest corner and eastern sections of the county. The street elevation at the former city office located in the Old Federal Building is 718 feet.

Indianapolis has a temperate climate, with very warm summers and without a dry season. Very cold temperatures may be produced by the invasion of continental polar air in the winter from northern latitudes. The polar air can be quite frigid with very low humidity. The arrival of maritime tropical air from the Gulf in the summer brings warm temperatures and moderate humidity. One of the longest and most severe heat waves brought temperatures of 100 degrees or more for nine consecutive days.

Precipitation is distributed fairly evenly throughout the year, and therefore there is no pronounced wet or dry season. Rainfall in the spring and summer is produced mostly by showers and thunderstorms. A rainfall of about 2 1/2 inches in a 24–hour period can be expected about once a year. Snowfalls of 3 inches or more occur on an average of two or three times in the winter.

Local levees and/or channel improvements now protect some formerly flood–prone areas.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 20 and the average last occurrence in the spring is April 22.

NORMALS, MEANS, AND EXTREMES

SPRINGFIELD, IL (SPI)

LATITUDE:     LONGITUDE:     ELEVATION (FT):     TIME ZONE:     WBAN: 93822

39 42′ 36″ N  86 16′20″W  GRND: 794  BARO: 797  CENTRAL (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3033.738.350.963.373.882.785.583.677.665.851.938.562.1
MEAN DAILY MAXIMUM5435.039.950.262.973.382.385.483.777.766.151.439.362.3
HIGHEST DAILY MAXIMUM627176858993102104102100908174104
YEAR OF OCCURRENCE195020001981197019881988195419881954195419501982JUL 1954
MEAN OF EXTREME MAXS.5457.562.573.981.486.892.493.992.490.282.271.161.278.8
NORMAL DAILY MINIMUM3017.220.931.941.551.761.065.262.855.643.534.123.242.4
MEAN DAILY MINIMUM5418.822.631.341.651.761.265.363.055.243.933.623.942.7
LOWEST DAILY MINIMUM62-27-21-716283744412817-2-23-27
YEAR OF OCCURRENCE199419821980194019661992194219651942194219581989JAN 1994
MEAN OF EXTREME MINS.54-4.21.412.625.736.647.553.651.739.328.217.02.226.0
NORMAL DRY BULB3025.529.641.452.462.871.975.473.266.654.743.030.952.3
MEAN DRY BULB5427.031.240.652.362.571.875.473.366.455.042.431.652.5
MEAN WET BULB1726.530.437.246.956.865.168.867.560.249.739.728.148.1
MEAN DEW POINT1722.125.030.740.551.460.665.264.155.844.634.924.143.2
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.63.97.24.31.60.00.00.017.6
MAXIMUM 323014.09.02.0*0.00.00.00.00.00.00.98.734.6
MINIMUM 323027.823.416.95.50.40.00.00.00.04.214.224.9117.3
MINIMUM 0304.42.20.20.00.00.00.00.00.00.00.01.88.6
H/CNORMAL HEATING DEG. DAYS3012259917323781655065833866010575615
NORMAL COOLING DEG. DAYS3000009621232226010618001014
RHNORMAL (PERCENT)3075747066676873757472767872
HOUR 01 LST3078777573777984868580808180
HOUR 07 LST3080818078818286909086848383
HOUR 13 LST3070676255555660615857667262
HOUR 19 LST3072706558575862666765727666
SPERCENT POSSIBLE SUNSHINE5240495054606566686561413855
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)603.32.51.70.60.80.71.11.71.41.21.62.819.4
THUNDERSTORMS600.70.72.74.46.27.37.65.93.51.81.10.442.3
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR11.01.0
PARTLY CLOUDY11.02.01.0
CLOUDY12.06.01.01.0
PRMEAN STATION PRESSURE (IN)2929.2029.1929.1129.1029.1029.1029.2029.2029.2029.2029.2029.2129.17
MEAN SEA-LEVEL PRES. (IN)1730.1230.1130.0629.9729.9830.0130.0130.0430.0630.1030.0930.1430.06
WINDSMEAN SPEED (MPH)4711.210.912.011.69.98.77.77.38.19.110.710.79.8
PREVAIL. DIR (TENS OF DEGS)3124233023232323232324242423
MAXIMUM 2-MINUTE:
SPEED (MPH)539463847404049454644444149
DIR. (TENS OF DEGS)22282625302828292627232628
YEAR OF OCCURRENCE199920012001199719971998199820002000200119982000JUL 1998
MAXIMUM 5-SECOND:
SPEED (MPH)547564858486160545551524961
DIR. (TENS OF DEGS)22232825212830292627222628
YEAR OF OCCURRENCE199919991998199719991998200120002000200119982000JUN 1998
PRECIPITATIONNORMAL (IN)302.322.463.793.704.003.494.473.642.872.633.233.3439.94
MAXIMUM MONTHLY (IN)6212.695.3510.748.0910.1010.2611.798.348.068.368.507.7212.69
YEAR OF OCCURRENCE195019711963196419431998199219801989194119851990JAN 1950
MINIMUM MONTHLY (IN)620.210.360.640.981.060.360.550.680.240.170.690.450.17
YEAR OF OCCURRENCE194419782001197619881988199719641963196319991976OCT 1963
MAXIMUM IN 24 HOURS (IN)593.472.503.052.563.533.805.324.723.073.904.152.835.32
YEAR OF OCCURRENCE195019771963196119611963198719761961195919931990JUL 1987
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013011.510.113.411.911.39.39.98.98.18.510.213.2126.3
PRECIPITATION 1.00300.40.50.80.91.00.81.21.10.70.50.80.69.3
SNOWFALLNORMAL (IN)308.27.83.20.50.*0.00.00.00.00.41.65.827.5
MAXIMUM MONTHLY (IN)7030.618.012.54.00.2T0.0T0.09.38.327.530.6
YEAR OF OCCURRENCE1978197919961940198919951989198919661973JAN 1978
MAXIMUM IN 24 HOURS (IN)5912.212.511.33.10.2T0.0T0.07.58.211.512.5
YEAR OF OCCURRENCE1978196519961953198919951989198919661973FEB 1965
MAXIMUM SNOW DEPTH (IN)5320159300000281320
YEAR OF OCCURRENCE1978197819601953198919661973JAN 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0302.42.41.00.20.00.00.00.00.00.10.51.98.5
PRECIPITATION (inches) 2001 INDIANAPOLIS, IN (IND)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.571.152.485.811.896.042.012.945.652.255.652.8340.27
19732.271.115.632.761.795.916.672.742.433.113.624.2742.31
19743.392.583.603.456.275.151.205.633.250.992.992.8141.31
19754.374.134.164.142.425.734.634.682.322.803.633.7146.72
19762.292.903.460.983.103.973.097.952.022.790.820.4533.82
19771.503.623.831.912.783.862.574.473.402.793.014.3138.05
19783.800.363.543.594.214.435.046.890.853.822.384.0342.94
19793.242.862.433.142.233.9311.066.090.362.324.372.5744.60
19801.671.844.262.102.264.152.878.343.311.871.410.7834.86
19810.362.881.225.819.231.645.751.692.042.351.123.4037.49
19825.641.624.732.405.945.163.441.001.200.914.165.7841.98
19831.051.032.944.474.684.531.582.791.283.874.553.4336.20
19840.973.163.143.904.351.514.833.274.692.605.384.3342.13
19851.373.735.942.604.603.064.065.292.711.828.503.3046.98
19860.732.843.934.347.373.584.881.185.687.842.321.7146.40
19871.551.281.842.681.774.119.220.861.411.362.604.7733.45
19882.353.043.224.021.060.364.711.461.143.074.392.5031.32
19891.751.323.724.325.793.806.158.058.062.922.791.9050.57
19901.795.173.932.447.593.113.684.462.684.643.237.7250.44
19911.591.946.414.344.640.912.173.541.125.473.951.4537.53
19921.401.152.614.171.564.0711.791.423.402.847.881.8944.18
19933.292.313.723.752.765.154.946.425.692.258.302.1850.76
19942.681.390.925.622.037.001.272.592.190.863.401.6631.61
19952.440.902.992.797.373.492.614.161.272.082.642.7235.46
19964.081.163.517.028.895.166.262.277.611.886.222.7556.81
19974.473.924.591.974.933.170.552.961.511.551.941.3332.89
19982.511.235.494.846.1310.263.973.660.484.892.521.0046.98
19996.353.571.714.093.752.572.961.500.751.820.692.6132.37
20002.072.861.643.805.004.552.954.264.823.082.672.7640.46
20010.741.950.641.824.104.468.342.474.667.012.693.0141.89
POR=130 YRS2.882.513.723.714.044.083.923.293.132.743.282.8940.19
AVERAGE TEMPERATURE (F) 2001 INDIANAPOLIS, IN (IND)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197226.528.439.852.165.068.874.673.168.351.539.931.951.7
197330.731.549.451.359.573.376.074.469.959.446.430.954.4
197431.632.445.355.062.168.676.071.860.652.542.532.952.6
197532.032.036.948.965.571.573.576.162.655.946.432.852.8
197623.938.846.653.458.871.373.971.363.648.734.724.650.8
197710.328.246.557.170.671.278.074.069.654.245.929.252.9
197818.217.836.755.263.574.077.275.070.452.745.734.451.7
197918.018.843.449.861.171.173.072.464.953.141.334.950.2
198028.522.536.049.164.069.178.576.667.950.940.331.851.3
198123.533.039.957.459.973.375.472.864.653.144.227.852.1
198220.126.442.548.668.667.876.271.764.455.744.240.252.2
198330.635.542.948.258.271.879.780.169.457.544.120.253.2
198422.837.333.050.058.875.372.474.364.261.343.038.952.6
198520.426.144.657.164.970.674.371.266.257.646.622.551.8
198628.531.443.953.863.572.877.570.169.855.639.832.353.3
198727.635.544.552.568.173.775.873.668.148.646.335.854.2
198825.927.241.451.964.473.478.377.567.348.244.231.752.6
198936.327.242.551.459.471.475.771.864.455.440.918.851.3
199037.337.646.251.460.171.373.972.566.953.947.534.654.4
199126.935.343.755.368.374.676.775.267.957.540.235.754.8
199231.538.443.252.160.568.173.569.565.153.443.233.352.7
199331.627.439.150.763.571.077.275.362.251.642.232.452.0
199421.829.741.054.160.475.075.571.866.557.048.638.953.4
199528.630.045.051.961.672.876.679.664.755.737.028.652.7
199625.131.235.649.361.972.173.174.965.555.337.334.451.3
199724.336.043.048.356.769.675.471.666.154.639.033.451.5
199836.640.842.053.367.171.574.975.371.457.045.536.556.0
199928.537.538.454.964.373.779.272.467.155.248.834.654.6
200027.938.747.051.464.971.073.073.665.257.840.719.852.6
200128.034.638.458.564.470.274.475.465.154.349.538.254.3
POR=130 YRS28.131.040.552.162.571.775.773.666.855.242.331.852.6

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 INDIANAPOLIS, IN (IND)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-7384364137461018105993747741618405298
1973-74002021155210521028905617314158184875
1974-7505163380671988101691886648178225588
1975-7680137288551992126575456436320315126
1976-77027950390412491693102556727645196362
1977-78003032657511041443131387329215046110
1978-7900363775719441453128866545517055964
1979-80313873847059291123122489347493365964
1980-8100454387341022127988976924418015601
1981-82109436862111461388107569048626185913
1982-83021103256217641062819681498211215114
1983-8410642466191386130479698744721116062
1984-85101191386538031375108263126985165172
1985-8601972455441311112693565234411475376
1986-8702430312750100911508206273785105151
1987-8825375045539001205109072639084155511
1988-89023751761810248821052693419226115481
1989-90081063137181426851760588432153195374
1990-91418634851893211758246512927104902
1991-92001032547399021035766670390185345078
1992-93278835364597310281046796424103355500
1993-94011294096801005133298473833619235809
1994-950461256483805111897361539213164844
1995-9610942888351125123097190846916276090
1996-9700852968239421254807676494261305668
1997-98354736677297387667072034448444868
1998-99001425757987811257678142978184820
1999-000070298481936114375555340183184738
2000-010010123772413941141845816246100315635
2001-5091331457826
COOLING DEGREE DAYS (base 65 F) 2001 INDIANAPOLIS, IN (IND)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
1972000895156313266141000979
1973000112025634930217244101155
19740011197313134622540320850
197500031002222813557114001046
1976000211519828420543400770
1977003452262124102861750601363
197800041102823823182031001300
1979000757197255250922400882
19800003681684253681396001177
1981001232925633224988500983
19820000146109356214984031967
19830013923146447420218001402
198400062531823729110328001008
198500536901902961991432100980
1986006127424939518918124001130
198700061562653432791370001186
19880013722744223951142001283
19890012057215338227942100973
1990001330102152892411471010956
1991000717829436732319630001395
1992000105313727415299100726
1993000064223389328510001055
1994000165630733022111413001057
1995000432250371459926001214
1996000771229261313107300991
1997000012178327217874900870
19980015012024631233121416011255
19990005672784502361383101178
20000020882052562741132200960
200100060901943023281016001081
SNOWFALL (inches) 2001 INDIANAPOLIS, IN (IND)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0T1.91.10.41.42.01.10.00.07.9
1973-740.00.00.00.00.427.53.88.03.02.10.00.044.8
1974-750.00.00.00.03.85.86.84.810.50.10.00.031.8
1975-760.00.00.00.04.58.15.60.62.30.00.00.021.1
1976-770.00.00.00.00.43.120.93.61.60.40.00.030.0
1977-780.00.00.00.02.815.230.63.95.40.00.00.057.9
1978-790.00.00.00.0T0.719.118.00.20.40.00.038.4
1979-800.00.00.00.00.80.25.014.53.60.70.00.024.8
1980-810.00.00.0T3.42.13.97.20.70.00.00.017.3
1981-820.00.00.0T0.415.621.813.63.53.30.00.058.2
1982-830.00.00.00.00.10.42.82.51.3T0.00.07.1
1983-840.00.00.00.00.18.37.217.19.2T0.00.041.9
1984-850.00.00.00.02.53.610.611.0T0.10.00.027.8
1985-860.00.00.00.0T8.11.79.51.1T0.00.020.4
1986-870.00.00.00.0T1.611.65.31.4T0.00.019.9
1987-880.00.00.00.0T1.12.94.82.5T0.00.011.3
1988-890.00.00.0T0.46.80.12.41.91.70.20.013.5
1989-900.0T0.09.30.68.24.12.51.3T0.00.026.0
1990-910.00.00.00.00.09.65.42.40.10.0T0.017.5
1991-920.00.00.00.03.00.27.10.22.91.30.0T14.7
1992-930.00.00.00.11.43.73.117.23.0T0.00.028.5
1993-940.00.00.02.41.15.614.03.93.70.80.0T31.5
1994-950.00.00.00.00.02.513.13.60.60.00.0T19.8
1995-960.00.00.00.01.411.025.21.612.5T0.00.051.7
1996-970.00.00.00.00.914.612.93.1TT0.00.031.5
1997-980.00.00.00.05.82.50.80.60.70.00.00.010.4
1998-990.00.00.00.00.03.318.32.95.2T0.00.029.7
1999-000.00.00.00.00.03.111.31.68.1T0.00.024.1
2000-010.0T0.00.00.216.32.10.8T0.2T0.019.6
2001-0.00.00.0TT0.7
POR=69 YRS0.0T0.00.21.95.16.75.33.40.50.0T23.1

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