2001 Springfield, Illinois (SPI)

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2001 SPRINGFIELD, ILLINOIS (SPI)

The location of Springfield near the center of North America gives it a typical continental climate with warm summers and fairly cold winters. The surrounding country is nearly level. There are no large hills in the vicinity, but rolling terrain is found near the Sangamon River and Spring Creek.

Monthly temperatures range from the upper 20s for January to the upper 70s for July. Considerable variation may take place within the seasons. Temperatures of 70 degrees or higher may occur in winter and temperatures near 50 degrees are sometimes recorded during the summer months.

There are no wet and dry seasons. Monthly precipitation ranges from a little over 4 inches in May and June to about 2 inches in January. There is some variation in rainfall totals from year to year. Thunderstorms are common during hot weather, and these are sometimes locally severe with brief but heavy showers. The average year has about fifty thunderstorms of which two–thirds occur during the months of May through August. Damaging hail accompanies only a few of the thunderstorms and the areas affected are usually small.

Sunshine is particularly abundant during the summer months when days are long and not very cloudy. January is the cloudiest month, with only about a third as much sunshine as July or August. March is the windiest month, and August the month with the least wind. Velocities of more than 40 mph are not unusual for brief periods in most months of the year. The prevailing wind direction is southerly during most of the year with northwesterly winds during the late fall and early spring months.

An overall description of the climate of Springfield would be one indicating pleasant conditions with sharp seasonal changes, but no extended periods of severely cold weather. Summer weather is often uncomfortably warm and humid.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 19 and the average last occurrence in the spring is April 17.

NORMALS, MEANS, AND EXTREMES

SPRINGFIELD, IL (SPI)

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

39 50′ 43″ N  89 41′02″W  GRND: 591  BARO: 594  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3032.537.250.063.974.783.986.984.278.766.851.737.362.3
MEAN DAILY MAXIMUM10134.538.750.463.474.383.787.685.478.767.051.238.362.8
HIGHEST DAILY MAXIMUM547174879095103112103101938374112
YEAR OF OCCURRENCE195019961981198619671954195419641984195419501984JUL 1954
MEAN OF EXTREME MAXS.10156.561.174.982.989.295.297.595.692.384.572.160.480.2
NORMAL DAILY MINIMUM3015.920.231.642.552.361.966.163.355.944.434.021.942.5
MEAN DAILY MINIMUM10119.022.532.042.653.162.666.764.756.745.733.923.443.6
LOWEST DAILY MINIMUM54-21-22-1219284048433217-3-21-22
YEAR OF OCCURRENCE199919631960199719661966197519861995195219641989FEB 1963
MEAN OF EXTREME MINS.101-3.90.813.427.638.048.855.152.540.529.316.41.926.7
NORMAL DRY BULB3024.228.740.853.263.572.976.573.767.355.642.929.752.4
MEAN DRY BULB10126.830.541.253.163.673.177.275.067.856.442.630.853.2
MEAN WET BULB1625.529.137.748.057.665.865.368.260.246.437.326.947.3
MEAN DEW POINT1621.024.231.641.448.061.462.164.955.540.932.422.842.2
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.0*2.17.611.16.73.10.10.00.030.7
MAXIMUM 323014.89.72.5*0.00.00.00.00.00.01.09.937.9
MINIMUM 323028.123.617.14.30.20.00.00.0*3.614.525.3116.7
MINIMUM 0304.92.60.10.00.00.00.00.00.00.0*2.19.7
H/CNORMAL HEATING DEG. DAYS30126510167503611667084431466310945688
NORMAL COOLING DEG. DAYS30000712024435727811322001141
RHNORMAL (PERCENT)3074747165666770747268747871
HOUR 00 LST3077787772757780848276788078
HOUR 06 LST3078808179808285898883838383
HOUR 12 LST3068676356545457605654657260
HOUR 18 LST3071716556555559646362707664
SPERCENT POSSIBLE SUNSHINE4848525156636871706863484458
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)542.82.61.90.90.90.40.71.31.11.11.52.517.7
THUNDERSTORMS540.50.72.55.36.97.78.36.74.22.41.60.647.4
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR
PARTLY CLOUDY
CLOUDY
PRMEAN STATION PRESSURE (IN)2829.4629.4429.3529.3129.3029.3029.3429.4029.4029.4229.4129.4629.38
MEAN SEA-LEVEL PRES. (IN)1630.1230.1230.0429.9529.9629.9529.9830.0230.0430.0730.0830.1330.04
WINDSMEAN SPEED (MPH)4212.312.113.112.810.99.48.17.78.710.212.412.110.8
PREVAIL. DIR (TENS OF DEGS)2718181818181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)639514651464352443238403552
DIR. (TENS OF DEGS)25292525281604332826242804
YEAR OF OCCURRENCE199620011996199720011996200119991997199619982001JUL 2001
MAXIMUM 5-SECOND:
SPEED (MPH)648625360565362514453534362
DIR. (TENS OF DEGS)14272525283406322825172406
YEAR OF OCCURRENCE199620011996199720011998200119991997199619981996JUL 2001
PRECIPITATIONNORMAL (IN)301.511.773.243.683.623.433.523.293.332.602.532.7335.25
MAXIMUM MONTHLY (IN)545.674.897.899.9110.729.2210.768.378.576.416.948.9410.76
YEAR OF OCCURRENCE194919901973196419961990198119811986199119851982JUL 1981
MINIMUM MONTHLY (IN)540.040.510.630.730.520.230.890.46T0.160.250.15T
YEAR OF OCCURRENCE198619951956197119921959199719921979196419991955SEP 1979
MAXIMUM IN 24 HOURS (IN)542.782.542.844.453.954.734.434.795.123.512.466.126.12
YEAR OF OCCURRENCE197519901972197919901958198119561959197319641982DEC 1982
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01308.88.411.811.19.99.48.58.38.48.19.510.5112.7
PRECIPITATION 1.00300.20.30.81.00.90.70.90.91.00.70.50.68.5
SNOWFALLNORMAL (IN)307.07.23.80.7T0.00.00.00.00.*1.85.726.2
MAXIMUM MONTHLY (IN)5421.116.020.37.3T0.0T0.00.00.39.222.722.7
YEAR OF OCCURRENCE197719931960198019961994198919511973DEC 1973
MAXIMUM IN 24 HOURS (IN)548.810.38.26.1T0.0T0.00.00.38.010.910.9
YEAR OF OCCURRENCE196419651978198019961994198919511973DEC 1973
MAXIMUM SNOW DEPTH (IN)100161216500000271516
YEAR OF OCCURRENCE1918196519781920192919511973MAR 1978
NORMAL NO. DAYS WITH:
SNOWFALL 1.0302.21.91.10.30.00.00.00.00.00.00.61.87.9
PRECIPITATION (inches) 2001 SPRINGFIELD, IL (SPI)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.030.824.033.351.882.721.704.523.951.403.273.3632.03
19731.310.847.895.292.627.293.361.663.285.461.433.8644.29
19742.613.153.393.116.375.000.917.702.171.393.581.4440.82
19754.283.631.912.895.904.382.713.342.841.372.501.9137.66
19760.983.675.601.071.961.412.292.332.203.000.530.6625.70
19771.511.215.092.785.784.261.165.955.945.161.632.2442.71
19780.720.834.202.845.811.732.994.041.581.572.133.3931.83
19791.901.093.757.171.320.944.632.85T1.341.982.3629.33
19800.721.424.292.222.223.232.083.914.951.470.571.9929.07
19810.432.122.274.576.175.8010.768.371.131.942.212.3548.12
19824.481.813.043.404.122.542.533.682.752.694.508.9444.48
19830.460.963.445.024.532.621.600.841.363.634.713.5032.67
19840.701.974.005.456.322.263.460.634.804.744.363.9142.60
19850.652.964.191.461.755.822.956.030.643.086.942.4338.90
19860.041.801.451.572.566.235.391.138.573.631.951.4035.72
19871.460.732.082.590.564.084.123.230.991.263.255.0029.35
19882.171.392.691.271.760.621.741.562.841.684.373.2225.31
19890.881.271.685.504.180.893.132.575.491.020.840.5828.03
19901.494.893.411.288.849.225.482.681.915.033.474.9752.67
19911.290.712.643.575.741.263.224.034.356.413.311.3837.91
19921.031.592.392.820.522.316.860.461.541.476.142.3629.49
19933.971.482.484.592.057.269.463.216.052.923.041.0747.58
19941.151.011.278.163.996.051.933.190.932.733.091.9935.49
19954.010.513.412.717.541.292.703.670.652.241.381.3431.45
19961.541.041.933.9310.721.953.321.811.121.592.960.7232.63
19971.582.742.501.483.101.540.894.643.531.794.501.7530.04
19982.432.714.634.055.658.813.325.301.273.302.810.6444.92
19991.942.150.974.612.902.952.084.642.421.780.252.2028.89
20000.541.272.801.941.357.463.163.332.922.552.990.9131.22
20012.063.011.111.993.504.423.413.342.504.962.612.0935.00
POR=122 YRS1.922.013.033.544.083.993.183.053.252.602.522.0935.26
AVERAGE TEMPERATURE (F) 2001 SPRINGFIELD, IL (SPI)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197224.429.040.852.564.770.575.973.868.752.938.326.751.5
197329.730.748.351.959.673.276.076.069.860.745.528.054.1
197426.132.644.254.861.668.378.872.961.955.842.232.752.7
197531.129.437.450.466.573.674.776.663.857.747.133.453.5
197623.539.645.455.059.772.477.471.665.249.434.624.151.5
197710.329.547.659.971.071.679.472.868.653.842.827.052.9
197815.616.733.653.962.374.276.373.170.953.745.231.450.6
197912.417.140.350.464.074.975.474.067.755.742.035.850.8
198027.821.837.151.164.672.081.479.368.752.842.331.752.6
198126.432.444.160.460.374.977.173.867.254.645.326.853.6
198217.024.240.348.170.068.377.172.566.155.443.038.851.7
198328.734.940.647.859.973.880.480.069.157.245.716.152.9
198422.335.931.850.460.375.274.576.965.759.941.735.952.5
198518.524.945.757.865.269.774.370.867.958.142.821.551.4
198629.126.945.357.465.974.778.870.070.456.137.932.653.8
198726.136.645.454.770.575.478.875.367.650.646.234.655.2
198825.625.641.552.865.873.878.678.768.749.743.031.653.0
198936.020.340.652.359.370.575.473.363.856.942.018.750.8
199037.136.145.550.859.973.175.274.068.453.547.830.054.3
199124.035.345.157.369.275.675.374.566.855.838.534.754.3
199232.138.143.752.262.369.674.370.967.056.142.432.853.5
199329.827.638.650.964.372.077.276.062.452.940.533.152.1
199421.429.442.953.962.375.275.472.866.757.847.837.353.6
199526.430.345.151.661.273.778.380.264.756.037.528.052.8
199623.231.436.049.363.372.572.173.664.255.635.331.550.7
199720.434.443.448.258.870.975.671.866.756.439.232.451.5
199832.740.440.453.068.371.775.474.971.156.746.034.055.4
199925.137.338.755.064.772.377.971.564.554.948.433.953.7
200027.539.046.252.265.969.873.575.467.158.138.117.452.5
200125.831.437.459.465.270.476.674.164.454.149.935.553.7
POR=122 YRS26.930.540.953.363.773.177.274.967.856.442.531.253.2

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 SPRINGFIELD, IL (SPI)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73311583757951181108995751239817405553
1973-74003019157811401200901642316167295194
1974-750213529968099610449928484356375501
1975-76100125253528973128073260132118825013
1976-7703844979051260169398953222244126241
1977-78022134066111721521134896833418646557
1978-79003634959110351627133675843511906286
1979-800950323684898114612498574219585740
1980-8100493956751028119390664818118405259
1981-8200513325811175148311397605029206052
1982-8305863256568061117836749510169145273
1983-84007526957415121320835102344617016225
1984-85001271946918991437111660126267325426
1985-86011992236581340110510606182617415450
1986-870192528480799911997885993253405079
1987-8803444405659341216113972036059115491
1988-89053347565410278901242749405224195723
1989-90041062696831431856803613459168105402
1990-917272360512108012628276122436905046
1991-92001202957879321007771651382154205119
1992-9308822966719911083104181341985355524
1993-94001173827309791347992679351142125731
1994-950464242512851118796461039514174977
1995-960010928982011401289973892462144196137
1996-97109730588410311375852664500212205941
1997-982557342768100399368176835439375049
1998-990017266567953123177180730577215015
1999-0000100319496955115574858137689244843
2000-01017824480414701208933852220109345953
2001-00103339443907
COOLING DEGREE DAYS (base 65 F) 2001 SPRINGFIELD, IL (SPI)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
1972000611419934729117810001145
1973000121225135034818464001221
19740071470136437252491720984
197500021152713153679436001200
197600328342283932149823001021
1977000762382174522511340101369
197800181072893582582225501253
197900029330532729513841001201
1980000108822851545216920001482
1981008504330338028012113001198
1982000117313137924412632111088
198300111728948347120534001501
1984000163031230337515544011236
1985007528017829320219117001020
198600143810929943418219314001283
1987000212123184363291300801454
19880003932814304371506001400
19890023057190332268772400980
19900014391826132828918212101144
19910052020732732630218418001389
19920004751662941991502800916
19930001712533863524613001122
1994000266732732925712327201158
199500003327641847910516001327
1996000099250231274802000954
19970000282043412231158100992
19980011014524632731220715011264
199900012742494092109414101063
2000004012317427333214837301094
200100060122203365288888001134
SNOWFALL (inches) 2001 SPRINGFIELD, IL (SPI)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.05.43.10.63.10.30.90.00.013.4
1973-740.00.00.00.01.322.77.35.34.40.40.00.041.4
1974-750.00.00.00.06.82.54.514.24.50.40.00.032.9
1975-760.00.00.00.08.54.38.52.12.20.00.00.025.6
1976-770.00.00.0TT6.921.18.90.61.10.00.038.6
1977-780.00.00.00.06.48.98.99.418.5T0.00.052.1
1978-790.00.00.00.0T3.215.94.68.1T0.00.031.8
1979-800.00.00.00.00.80.15.111.75.57.30.00.030.5
1980-810.00.00.0T3.52.12.78.60.60.00.00.017.5
1981-820.00.00.00.00.121.612.011.40.74.60.00.050.4
1982-830.00.00.00.00.20.92.41.35.40.20.00.010.4
1983-840.00.00.0TT16.23.99.85.70.00.00.035.6
1984-850.00.00.00.01.80.79.32.5TT0.00.014.3
1985-860.00.00.00.0T4.30.215.10.60.10.00.020.3
1986-870.00.00.00.00.5T20.3T0.00.00.00.020.8
1987-880.00.00.00.00.15.70.410.25.00.00.00.021.4
1988-890.00.00.00.0T5.50.313.75.2TT0.024.7
1989-900.00.00.00.3T6.70.60.51.2T0.00.09.3
1990-910.00.00.00.0T9.46.80.83.10.00.00.020.1
1991-920.00.00.0T3.20.54.60.92.2T0.00.011.4
1992-930.00.00.00.01.22.57.016.02.90.40.00.030.0
1993-940.00.00.00.20.81.75.84.40.92.7T0.016.5
1994-95T0.00.00.0T0.23.74.40.20.00.00.08.5
1995-960.00.00.00.01.25.911.21.11.60.0T0.021.0
1996-970.00.00.00.00.22.419.3TTT0.00.021.9
1997-980.00.00.0T1.27.63.50.06.90.00.00.019.2
1998-990.00.00.00.0T2.516.13.26.4T0.00.028.2
1999-000.00.00.00.00.02.46.80.35.5T0.00.015.0
2000-010.00.00.00.0T10.02.10.90.4T0.00.013.4
2001-0.00.00.00.0T3.3
POR=53 YRST0.00.00.01.75.06.15.63.70.7T0.022.8

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