2001 Peoria, Illinois (PIA)

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2001 PEORIA, ILLINOIS (PIA)

The airport station is situated on a rather level tableland surrounded by well–drained and gently rolling terrain. It is set back a mile from the rim of the Illinois River Valley and is almost 200 feet above the river bed. Exposures of all instruments are good. The climate of this area is typically continental as shown by its changeable weather and the wide range of temperature extremes.

June and September are usually the most pleasant months of the year. Then during October or the first of November, Indian Summer is often experienced with an extended period of warm, dry weather.

Precipitation is normally heaviest during the growing season and lowest during midwinter.

The earliest snowfalls have occurred in September and the latest in the spring have occurred as late as May. Heavy snowfalls have rarely exceeded 20 inches.

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 24.

NORMALS, MEANS, AND EXTREMES

PEORIA, IL (PIA)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 14842

40 40′ 03″ N  89 41′02″W  GRND: 713  BARO: 716  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3029.934.948.162.072.882.285.783.176.964.849.834.660.4
MEAN DAILY MAXIMUM9632.136.348.361.672.582.286.484.477.265.249.336.161.0
HIGHEST DAILY MAXIMUM627072869293105103103100908171105
YEAR OF OCCURRENCE198919761986198619871988194019881953196319501982JUN 1988
MEAN OF EXTREME MAXS.9652.957.972.981.888.294.296.594.991.583.070.457.378.5
NORMAL DAILY MINIMUM3013.217.729.840.850.960.765.463.155.243.132.519.341.0
MEAN DAILY MINIMUM9615.919.829.540.750.960.564.863.055.143.431.720.941.3
LOWEST DAILY MINIMUM62-25-19-1014253947412619-2-23-25
YEAR OF OCCURRENCE197719961960198219661993197219861942197219771989JAN 1977
MEAN OF EXTREME MINS.96-7.0-1.710.825.435.746.653.350.438.427.114.1-1.524.3
NORMAL DRY BULB3021.626.339.051.461.971.575.573.166.154.041.227.050.7
MEAN DRY BULB9624.028.038.851.261.871.375.673.766.154.340.528.551.2
MEAN WET BULB1823.227.836.146.256.564.869.067.559.248.537.426.946.9
MEAN DEW POINT1819.123.029.839.550.960.465.564.254.943.232.622.842.2
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.10.54.78.45.21.6*0.00.020.5
MAXIMUM 323017.411.73.20.10.00.00.00.00.00.01.612.646.6
MINIMUM 323029.425.319.55.90.40.00.00.00.14.716.726.7128.7
MAXIMUM 90306.73.40.10.00.00.00.00.00.00.00.12.913.2
H/CNORMAL HEATING DEG. DAYS301345108480640818311095435671411786148
NORMAL COOLING DEG. DAYS30000087206326261871500982
RHNORMAL (PERCENT)3074747065666772747370747871
HOUR 00 LST3077787671747682848278798178
HOUR 06 LST3079808178808186898885838383
HOUR 12 LST3068666255565659605958667261
HOUR 18 LST3072706455555660636463717664
SPERCENT POSSIBLE SUNSHINE5247505155606769676461434256
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)593.22.82.20.90.90.61.01.41.41.72.03.221.3
THUNDERSTORMS590.50.62.65.06.98.27.66.44.82.51.40.647.1
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)15.67.2
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR11.05.05.09.0
PARTLY CLOUDY11.03.01.04.0
CLOUDY15.06.010.011.09.0
PRMEAN STATION PRESSURE (IN)2929.4029.3929.3029.3029.2929.2929.3029.3029.3029.4029.3129.4029.33
MEAN SEA-LEVEL PRES. (IN)1830.1230.1230.0629.9629.9629.9629.9930.0330.0530.0830.0830.1530.05
WINDSMEAN SPEED (MPH)4510.910.811.711.49.68.57.57.18.09.210.610.39.6
PREVAIL. DIR (TENS OF DEGS)3318181818181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)638395445363930373544443354
DIR. (TENS OF DEGS)23252324282624302627232223
YEAR OF OCCURRENCE199620011998199720012001199720012001199619981998MAR 1998
MAXIMUM 5-SECOND:
SPEED (MPH)647526456445941494660583864
DIR. (TENS OF DEGS)27282024282222292623242820
YEAR OF OCCURRENCE199620011998199720012001199720012001199619982001MAR 1998
PRECIPITATIONNORMAL (IN)301.511.422.913.773.703.994.203.103.872.652.692.4436.25
MAXIMUM MONTHLY (IN)628.115.376.958.6610.1911.6910.158.6113.0910.807.626.3413.09
YEAR OF OCCURRENCE196519971973194719951974199319651961194119851949SEP 1961
MINIMUM MONTHLY (IN)620.220.330.390.710.820.600.330.250.030.030.220.320.03
YEAR OF OCCURRENCE198619471958197119921988198819921979196419991995SEP 1979
MAXIMUM IN 24 HOURS (IN)584.453.343.395.063.624.444.224.324.153.704.323.385.06
YEAR OF OCCURRENCE196519971944195019561974199319551961196919901949APR 1950
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01309.58.211.011.610.79.09.18.79.08.49.510.6115.3
PRECIPITATION 1.00300.30.20.41.00.81.01.40.81.00.50.60.58.5
SNOWFALLNORMAL (IN)307.35.93.41.20.*0.00.00.00.00.11.96.426.2
MAXIMUM MONTHLY (IN)5724.715.216.913.40.1TT0.0T1.89.121.724.7
YEAR OF OCCURRENCE19791989196019821966200019901992196719741977JAN 1979
MAXIMUM IN 24 HOURS (IN)5712.27.69.06.10.1TT0.0T1.87.210.212.2
YEAR OF OCCURRENCE19791944194619821966200019901992196719511973JAN 1979
MAXIMUM SNOW DEPTH (IN)942017101000001371320
YEAR OF OCCURRENCE19791979196019821942192919751973JAN 1979
NORMAL NO. DAYS WITH:
SNOWFALL 1.0302.41.71.20.40.00.00.00.00.00.*0.42.18.2
PRECIPITATION (inches) 2001 PEORIA, IL (PIA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.810.742.484.381.305.973.544.265.212.502.562.4836.23
19731.760.996.954.264.516.466.040.907.585.181.484.1150.22
19743.091.652.694.116.2611.692.630.811.452.074.131.9342.51
19752.592.851.733.925.193.904.265.622.743.632.752.0441.22
19760.782.564.254.865.112.922.982.301.782.480.830.3831.23
19771.220.954.411.243.542.063.437.286.264.001.772.2538.41
19780.690.591.564.697.721.963.471.282.321.732.543.5432.09
19792.481.374.424.481.961.774.810.870.031.702.762.3328.98
19800.591.062.792.782.058.941.436.164.092.440.672.2535.25
19810.482.410.925.715.776.227.085.611.311.371.641.2439.76
19822.881.134.805.403.153.157.533.971.241.474.955.4545.12
19830.531.012.847.066.664.481.991.095.083.015.582.6541.98
19840.592.283.955.184.842.905.020.782.385.073.953.8240.76
19850.992.625.771.143.145.113.433.703.434.617.622.2443.80
19860.221.790.871.392.956.537.001.746.394.641.322.6037.44
19871.490.841.981.841.693.272.904.021.620.732.884.1527.41
19881.990.712.831.591.680.600.332.112.821.084.192.2322.16
19891.001.171.144.392.231.282.222.862.871.570.930.8722.53
19901.733.593.952.326.197.999.185.311.033.177.193.7055.35
19911.190.573.672.975.941.500.353.413.597.313.572.0636.13
19921.061.552.581.610.820.808.190.255.811.335.582.9932.57
19933.551.684.084.893.255.7010.157.387.562.422.221.1954.07
19940.921.980.663.861.521.811.372.921.273.193.492.2125.20
19952.830.541.564.7710.191.572.831.951.473.232.480.3233.74
19961.440.822.042.557.602.084.571.031.622.512.161.0629.48
19971.055.371.682.762.651.380.896.103.132.292.851.6931.84
19982.552.644.674.965.505.191.645.262.303.212.631.7542.30
19993.071.160.944.314.923.214.222.781.541.350.222.5530.27
20000.801.821.632.534.043.761.950.912.641.953.220.9626.21
20013.292.821.094.215.332.791.464.244.155.081.901.3537.71
POR=146 YRS1.791.812.773.553.993.823.753.033.582.512.391.9934.98
AVERAGE TEMPERATURE (F) 2001 PEORIA, IL (PIA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197219.724.536.948.963.268.073.272.466.250.036.223.848.6
197327.428.946.550.957.971.875.074.767.057.742.424.852.1
197423.129.441.153.659.366.776.972.261.153.639.629.950.5
197527.526.133.847.064.672.173.874.760.955.344.930.250.9
197619.534.943.954.158.270.575.370.363.347.332.021.049.2
19778.627.044.657.168.670.278.271.466.451.340.322.850.5
197813.315.432.451.260.371.375.073.270.552.141.326.848.6
19799.414.737.947.760.571.273.072.565.652.638.031.847.9
198023.619.935.649.263.069.378.576.967.949.640.728.950.3
198123.727.840.755.458.773.275.472.865.953.445.027.351.6
198215.824.837.746.568.467.275.771.364.955.041.537.450.5
198328.233.540.346.858.672.680.280.867.955.344.915.252.0
198420.635.531.349.658.874.373.074.964.057.640.333.951.2
198516.823.243.857.064.368.773.770.266.655.539.018.649.8
198626.623.543.255.464.072.377.468.968.955.236.230.951.9
198725.235.744.154.168.474.079.073.765.748.044.632.453.7
198822.723.539.951.165.473.178.678.568.248.241.529.751.7
198933.918.739.250.759.169.875.372.462.254.939.816.249.4
199034.833.743.450.057.871.072.672.166.151.945.227.752.2
199121.532.442.855.868.074.775.474.365.453.936.032.052.7
199230.135.642.350.061.069.772.468.664.253.139.829.551.4
199327.425.136.449.863.670.476.175.061.451.739.431.450.6
199418.226.241.053.261.774.474.671.666.756.244.834.751.9
199524.128.342.649.358.372.176.279.462.754.234.427.550.8
199621.928.934.048.160.071.172.073.464.454.033.728.749.2
199719.331.941.447.157.170.775.471.566.154.938.130.950.4
199829.739.639.552.166.870.775.775.270.455.545.233.354.5
199922.936.138.253.763.972.078.171.264.154.447.231.552.8
200025.736.746.551.664.569.273.375.966.557.437.616.151.8
200124.228.636.457.863.869.776.874.664.053.050.034.552.8
POR=97 YRS24.028.138.851.161.871.375.673.666.254.340.528.551.1

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 PEORIA, IL (PIA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-739198746185512711161100556642321606073
1973-74005425367112371292991736348214425838
1974-750115735475610811156108595953492176192
1975-761311713065961069140486864835122155653
1976-770910655698113571747106162327360176790
1977-7806394187341301159513831006405222147123
1978-790449390704117417221403833510194106993
1979-8031970401804102212791300907474123266428
1980-81006547072211121273103774829522115944
1981-82106036059411631520111983954829286261
1982-83013943256978491133875758537206175504
1983-84209231159515411371849103846720616473
1984-85111532467349561489116465628471385793
1985-86061112877741432118411566833149276046
1986-8702637305858104812288146403405325351
1987-880166852060910011306119877240964125975
1988-89043851769810909581290796442231256089
1989-90031343177491509929871672475226165901
1990-918399409589114813419096832858605560
1991-920014334786310171078847698444180195636
1992-9302310936774810941159111087845096486082
1993-9400135408761103514481078734371157126139
1994-9508672826029321258102268746620775538
1995-9620133332911115413281041954499210286592
1996-97209733893011201412922723530252186344
1997-9853543648021051108870779338150445342
1998-990019297587975130080682333391185249
1999-000010233052910311214814566394103225105
2000-010092252818150712561013881248120366223
2001-10102371444938
COOLING DEGREE DAYS (base 65 F) 2001 PEORIA, IL (PIA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720000103140273253130300902
1973000732113153061213500998
197400012439937723347600817
1975000083237292307551400988
19760002814176326180621400800
197700042176179416209880001110
19780000812083162672210001093
1979000062206259258952300903
19800006701604253781561001196
1981000133325033125093610977
19820000141101338215962600917
198300001425047949418817001442
1984000122428525631512922001043
19850034854155279173164000876
1986001530682343921571616001063
198700019166278440293920301291
19880002842664314281405001356
19890022056177324240571100887
1990009348204251230138900883
19910041618929633129315911001299
199200016217123714090600707
199300026021835032133600990
1994000256130030721812316001050
199500006225355453735001117
199600006321722426788500864
1997000012199334210945900908
1998009011422233731818710001197
1999000268233414197828001004
200000209215526234514625401031
20010003889184372307784001072
SNOWFALL (inches) 2001 PEORIA, IL (PIA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.37.34.70.82.71.20.70.00.017.7
1973-740.00.00.00.00.118.96.71.90.91.20.00.029.7
1974-750.00.00.00.09.16.28.812.83.81.60.00.042.3
1975-760.00.00.00.08.11.48.62.52.00.00.00.022.6
1976-770.00.00.0T0.44.116.34.12.41.40.00.028.7
1977-780.00.00.00.06.421.77.07.05.00.00.00.047.1
1978-790.00.00.00.02.614.224.73.66.5T0.00.051.6
1979-800.00.00.00.00.80.13.711.35.36.30.00.027.5
1980-810.00.00.0T4.13.35.910.5T0.00.00.023.8
1981-820.00.00.00.00.19.811.06.16.513.40.00.046.9
1982-830.00.00.00.00.92.05.64.85.70.10.00.019.1
1983-840.00.00.00.03.315.96.94.16.00.00.00.036.2
1984-850.00.00.00.0T0.99.86.2TT0.00.016.9
1985-860.00.00.00.01.06.21.313.90.40.10.00.022.9
1986-870.00.00.00.01.0T18.00.1T0.00.00.019.1
1987-880.00.00.0T0.39.81.99.71.90.00.00.023.6
1988-890.00.00.00.00.74.70.315.2T0.9T0.021.8
1989-900.00.00.00.6T10.54.86.2TT0.00.022.1
1990-91T0.00.0TT3.89.81.06.90.00.00.021.5
1991-920.00.00.0T3.65.16.40.44.1T0.00.019.6
1992-930.00.0TT0.76.16.812.43.50.70.00.030.2
1993-940.00.00.0T3.62.49.412.6T0.10.00.028.1
1994-950.00.00.00.0T0.53.82.80.7TT0.07.8
1995-960.00.00.00.00.23.65.91.91.10.50.00.013.2
1996-970.00.00.00.0
1997-980.0T1.913.07.1T7.3T0.00.0
1998-990.00.00.00.00.55.218.11.06.9TT0.031.7
1999-000.00.00.00.00.04.78.80.6TTTT14.1
2000-010.00.00.00.0T21.25.11.82.1T0.00.030.2
2001-0.00.00.00.0T0.4
POR=56 YRST0.0T0.12.06.16.74.93.90.80.00.024.5

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