2001 Middletown/Harrisburg Intl Apt Pennsylvania (MDT)

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2001 MIDDLETOWN/HARRISBURG INTL APT PENNSYLVANIA (MDT)

Harrisburg, the capital of Pennsylvania, is situated on the east bank of the Susquehanna River. It is in the Great Valley formed by the eastern foothills of the Appalachian Chain, and about 60 miles southeast of the Commonwealths geographic center. It is nested in a saucer–like bowl, 10 miles south of Blue Mountain, which serves as a barrier to provide a modifying influence upon the severe winter climate experienced 50 to 100 miles to the north and west. Although the severity of the winter climate is lessened, the city lies a little too far inland to derive the full benefits of the coastal Climate.

Air masses change with some regularity, and any one condition does not persist for many days in succession. The mountain barrier occasionally prevents cold waves from reaching the Great Valley. The city is favorably located to receive precipitation produced when warm, maritime air from the Atlantic Ocean is forced upslope to cross the Blue Ridge Mountains.

The Growing Season is 192 days.

During June 1992, Hurricane Agnes produced 15.11 inches of rain from the 20th to the 23rd. Prolonged dry spells occur occasionally. During September and October 1947 there were 35 consecutive days with less then .01 inches of precipitation.

Flood stage on the Susquehanna River occurs on the average of about every three years in Harrisburg, but serious flooding is much less frequent. About one–third of all floods have occurred during March. Tropical hurricanes rarely reach Harrisburg with destructive winds.

NORMALS, MEANS, AND EXTREMES

PENDLETON, OR (PDT)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 24155

45 41′ 54″ N  118 50′ 03″ W  GRND:  1504  BARO:  1504  PACIFIC (UTC + 8)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3035.939.250.362.072.581.285.883.876.364.752.640.662.1
MEAN DAILY MAXIMUM2838.041.249.062.572.981.986.083.876.166.052.441.262.6
HIGHEST DAILY MAXIMUM637378879397100107101102978475107
YEAR OF OCCURRENCE195019971998198519421966196619441953194119501998JUL 1966
MEAN OF EXTREME MAXS.2857.660.871.183.389.394.296.094.190.181.670.460.779.1
NORMAL DAILY MINIMUM3021.223.332.041.251.160.665.664.356.544.636.126.643.6
MEAN DAILY MINIMUM2823.725.431.842.252.161.666.464.156.645.135.426.844.3
LOWEST DAILY MINIMUM63−22−551931404945302313−8−22
YEAR OF OCCURRENCE199419791984198219661980194519761963200019551960JAN 1994
MEAN OF EXTREME MINS.287.29.018.329.038.749.456.353.040.831.021.610.430.4
NORMAL DRY BULB3028.631.341.251.661.870.975.774.166.454.744.433.652.9
MEAN DRY BULB2831.033.340.452.462.571.876.274.066.455.443.833.953.4
MEAN WET BULB627.127.534.946.255.065.558.254.250.142.634.827.743.7
MEAN DEW POINT621.620.227.838.849.061.255.551.446.938.429.822.638.6
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.83.25.62.63.40.00.00.015.6
MAXIMUM 323010.87.80.60.00.00.00.00.00.00.00.07.626.8
MINIMUM 323027.723.814.03.40.00.00.00.00.01.88.824.2103.7
MINIMUM 0301.20.50.00.00.00.00.00.00.00.00.00.01.7
H/CNORMAL HEATING DEG. DAYS301128944738402147900593296189735347
NORMAL COOLING DEG. DAYS300000481863322851011000962
RHNORMAL (PERCENT)
HOUR 01 LST
HOUR 07 LST
HOUR 13 LST
HOUR 19 LST
SPERCENT POSSIBLE SUNSHINE6248545758596467666158474457
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)582.32.31.81.00.90.60.60.81.52.71.82.518.8
THUNDERSTORMS580.20.21.02.44.86.06.54.92.90.80.50.230.4
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)495.45.35.35.25.24.94.94.74.74.65.25.65.1
MIDNIGHT-MIDNIGHT (OKTAS)85.45.15.25.04.85.34.94.64.63.54.65.34.9
MEAN NO. DAYS WITH:
CLEAR616.56.67.16.55.96.47.07.78.59.86.36.184.4
PARTLY CLOUDY617.87.48.38.710.911.711.711.39.58.48.27.5111.4
CLOUDY6116.714.315.414.914.311.911.911.611.612.415.216.8167.0
PRMEAN STATION PRESSURE(IN)2529.7229.7329.6729.6229.6329.6329.6529.6929.7329.7529.7329.7429.69
MEAN SEA-LEVEL PRES. (IN)1030.1030.0930.0229.9829.9929.9929.9830.0430.0530.1230.1230.1230.05
WINDSMEAN SPEED (MPH)287.88.39.38.47.16.35.55.05.25.57.07.36.9
PREVAIL. DIR (TENS OF DEGS)1431313131303030303131313031
MAXIMUM 2-MINUTE:
SPEED (MPH)135363738283135282332313838
DIR. (TENS OF DEGS)30313034123131303029313030
YEAR OF OCCURRENCE200120012001200120012001200120012001200120012001DEC 2001
MAXIMUM 5-SECOND:
SPEED (MPH)139514548323841323040434451
DIR. (TENS OF DEGS)31283034123131303026313128
YEAR OF OCCURRENCE200120012001200120012001200120012001200120012001FEB 2001
PRECIPITATIONNORMAL (IN)302.842.933.283.244.263.853.593.313.512.933.523.2440.50
MAXIMUM MONTHLY (IN)238.015.936.327.969.718.128.096.269.115.596.237.579.71
YEAR OF OCCURRENCE197919811993198319891982199419861999198919851983MAY 1989
MINIMUM MONTHLY (IN)230.430.820.950.451.391.000.970.530.650.470.920.310.31
YEAR OF OCCURRENCE198119801995198519991988198319951986200019981998DEC 1998
MAXIMUM IN 24 HOURS (IN)212.091.842.632.062.912.323.842.783.462.783.272.583.84
YEAR OF OCCURRENCE197919852000199219841987199419911999199519931993JUL 1994
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01309.611.012.513.09.710.89.210.26.45.69.69.0116.6
PRECIPITATION 1.00300.60.60.70.50.20.50.60.60.81.00.70.57.3
SNOWFALLNORMAL (IN)3015.715.29.60.3T0.00.00.00.0T2.011.053.8
MAXIMUM MONTHLY (IN)2338.928.822.810.20.0T0.0T0.0T9.717.438.9
YEAR OF OCCURRENCE199619831993198219931993198219871995JAN 1996
MAXIMUM IN 24 HOURS (IN)2121.714.220.44.00.0T0.0T0.0T7.99.121.7
YEAR OF OCCURRENCE199619791993199619931993197919871990JAN 1996
MAXIMUM SNOW DEPTH (IN)282023201000000121323
YEAR OF OCCURRENCE196119611993195919531951FEB 1961
NORMAL NO. DAYS WITH:
SNOWFALL 1.0303.04.22.30.20.00.00.00.00.00.00.42.712.8
PRECIPITATION (inches) 2001 PENDLETON, OR (PDT)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.961.081.470.681.970.800.580.360.160.580.702.3111.65
19730.501.090.430.270.670.150.010.081.341.713.764.6814.69
19740.791.570.812.130.260.190.90TT0.291.001.599.53
19753.531.300.650.970.300.280.730.670.001.800.841.9813.05
19761.771.001.651.090.920.330.161.770.180.540.190.4410.04
19770.480.641.510.181.870.370.062.581.170.512.002.4213.79
19782.821.601.032.780.630.760.772.210.92T2.371.8617.75
19791.431.721.181.170.390.210.091.400.301.681.830.6212.02
19802.481.391.600.592.141.120.770.030.591.220.841.2013.97
19810.891.351.431.201.591.530.940.031.310.861.912.3115.35
19821.540.771.220.840.310.630.510.241.472.670.342.2012.74
19830.861.572.820.700.731.440.520.560.460.841.673.4215.59
19840.531.741.831.701.021.130.060.440.391.022.140.9212.92
19850.441.331.130.370.440.690.340.262.100.892.111.2711.37
19861.662.581.130.431.180.030.480.021.280.802.120.8212.53
19871.480.641.390.470.850.380.340.050.03T0.761.237.62
19881.860.120.952.471.560.310.01T0.310.102.160.3710.22
19891.861.361.721.571.470.570.091.250.120.841.270.2112.33
19900.770.281.141.541.830.580.180.62T0.780.870.849.43
19910.980.571.000.713.182.140.240.42T0.922.680.6713.51
19920.411.040.261.210.070.940.700.430.421.321.150.738.68
19931.790.801.491.851.510.711.452.19T0.220.930.9213.86
19941.571.710.560.452.550.770.38T0.361.281.980.8512.46
19952.531.071.932.280.972.300.240.290.551.212.181.7317.28
19961.881.801.001.082.000.470.060.050.611.221.962.3214.45
19971.840.391.161.560.330.760.660.070.771.431.641.0511.66
19982.611.191.011.281.530.760.68T1.110.602.311.3714.45
19990.811.220.740.501.270.51T0.540.011.511.231.019.35
20001.992.982.420.691.600.720.07T2.012.061.220.5716.33
20010.950.621.311.890.451.120.520.080.091.541.150.7010.42
POR=102 YRS1.571.311.241.081.150.960.310.400.621.041.511.5012.69
AVERAGE TEMPERATURE (F) 2001 PENDLETON, OR (PDT)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197234.037.447.847.660.968.374.776.261.151.142.627.152.4
197331.338.445.850.361.366.975.371.764.052.842.641.553.5
197430.443.846.451.757.371.173.375.567.554.844.840.654.8
197537.139.045.247.559.365.878.470.167.054.342.340.553.9
197639.237.942.850.258.863.773.467.767.353.142.735.952.7
197726.341.544.255.355.169.170.374.958.550.038.334.851.5
197832.239.345.748.054.466.372.269.460.551.733.529.550.2
197915.337.746.050.459.566.672.870.665.554.334.738.251.0
198025.636.141.351.956.460.472.166.963.351.342.039.250.5
198136.238.945.750.456.061.669.274.363.850.644.237.252.3
198235.038.143.547.656.867.671.171.560.750.737.335.751.3
198340.843.847.849.058.962.768.472.758.952.545.923.252.1
198434.639.746.848.254.762.172.972.260.449.141.830.451.1
198526.333.543.253.158.565.677.468.157.050.326.519.548.3
198635.939.048.850.058.670.067.675.858.954.042.231.552.7
198730.439.146.453.959.767.268.970.666.254.142.632.752.7
198832.441.144.151.956.863.972.070.063.458.444.333.952.7
198938.325.142.552.955.965.970.368.863.651.844.633.251.1
199039.637.945.754.856.464.775.272.268.251.345.425.853.1
199131.244.742.649.653.959.671.573.364.951.641.236.951.8
199238.742.447.752.862.470.471.972.661.954.239.832.053.9
199325.128.241.950.361.862.965.468.064.354.634.635.649.4
199441.034.946.754.460.164.475.371.767.251.640.435.353.6
199534.941.745.349.057.762.172.067.466.050.246.134.552.2
199634.435.743.352.054.564.074.772.161.051.140.335.451.5
199732.638.645.448.659.863.170.473.164.951.442.734.952.1
199837.942.945.950.356.265.477.474.667.850.945.536.254.3
199941.042.343.447.354.163.770.072.562.550.846.038.152.6
200035.539.244.154.058.365.971.670.761.649.735.131.151.4
200132.735.544.447.358.762.170.573.266.251.242.236.651.7
POR=96 YRS32.838.044.951.358.465.573.171.463.252.541.435.152.3

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 PENDLETON, OR (PDT)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-735416542266311701036738588434169735467
1973-74116973726667211064589573391241294760
1974-758039313600750857721609517194574665
1975-7601243332673751791782679436206894794
1976-77442313636608961192653639299301265106
1977-7820352004617929271011714593504322465625
1978-7974114640393610941533757582432184626177
1979-801204332690282312108297283882671415669
1980-81433884386817948867245934352751265077
1981-82201128440617855919747662515256725232
1982-83227171435825901741588528470242955025
1983-8442118038156912929357295584963161345633
1984-854018249069210651196876665351224655810
1985-8642224245211491402898722497446277256136
1986-8733021333567510311065717571332201715244
1987-8825126533466899510046896373872641265206
1988-892241202086169578211113691354279425227
1989-90111776403607978781752591299262894866
1990-9191311419583121110395646894543381625492
1991-924252418707865810649527362127364559
1992-931128129333752101512311025709432153985916
1993-942735114318908903736838559321174835016
1994-95150304067319159286446024732371265107
1995-9612651452560941938840664387321645245
1996-9784153423733909998733599488185845317
1997-9813073415662927832611585442273374870
1998-9903564295788877386286625223361084947
1999-001720117433565830905740640324219574867
2000-0171213746889210469958196315232381215889
2001-14548419676874
COOLING DEGREE DAYS (base 65 F) 2001 PENDLETON, OR (PDT)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197200005013431435855000911
197300006313732723272000831
197400009219272332122400958
197500002788423179109800834
197600002053270129103300578
197700016315219034816000725
1978000019323618216000528
197900002111426118665300650
19800002513232101442000417
19810004228155297101000587
19820000715821921547000646
1983000060321552466000499
1984000075525623151300603
1985000028913941277000647
198600028818412134135100772
1987000841145152194108400652
19880000169824616478900611
1989000057618214341000447
19900000492330245114300788
199100000821426756900554
199200015220422927545400810
1993000059424713699400387
199400082972341214103000767
19950000174423010889000488
1996000004231223039000623
19970000313419125879500598
19980006556390309144000910
1999000077818026050050580
20000000178921519640000557
20010000484319326593000642
SNOWFALL (inches) 2001 PENDLETON, OR (PDT)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0TT12.62.25.9T0.10.00.020.8
1973-740.00.00.03.29.15.32.60.5TT0.00.020.7
1974-750.00.00.00.0TT16.63.3T2.2T0.022.1
1975-760.00.00.00.05.23.00.30.30.10.00.00.08.9
1976-770.00.00.00.00.01.03.10.50.40.00.00.05.0
1977-780.00.00.00.08.511.56.1T3.90.0T0.030.0
1978-790.00.00.00.09.07.414.72.2T0.00.00.033.3
1979-800.00.00.00.04.3T16.60.93.90.00.00.025.7
1980-810.00.00.00.02.02.73.61.20.00.00.00.09.5
1981-820.00.00.00.00.65.15.71.51.9T0.00.014.8
1982-830.00.00.00.0T1.60.20.90.00.00.00.02.7
1983-840.00.00.00.0T26.61.01.2TT0.00.028.8
1984-850.00.00.00.0T6.20.812.70.6T0.00.020.3
1985-860.00.00.00.014.99.1T7.60.00.0T0.031.6
1986-870.00.00.00.01.26.85.80.0T0.00.00.013.8
1987-880.00.00.00.00.32.310.60.01.50.00.00.014.7
1988-890.00.00.00.0TT4.34.94.00.0T0.013.2
1989-900.00.00.00.00.01.0T2.01.30.00.00.04.3
1990-910.00.00.00.0T6.41.60.00.6T0.00.08.6
1991-920.00.00.02.31.0T0.8T0.00.00.00.04.1
1992-930.00.00.00.00.27.625.114.81.8TT0.049.5
1993-94T0.00.00.00.70.4T16.80.20.00.0T18.1
1994-950.00.00.00.00.63.82.07.2T0.00.00.013.6
1995-960.00.00.00.0
1996-9710.13.2T
1997-984.20.0
1998-990.00.00.80.02.4TTT0.0
1999-000.00.00.00.00.00.55.74.51.00.0T0.011.7
2000-010.00.00.00.00.72.53.10.5TTTT6.8
2001-0.00.00.00.0T3.0
POR=63 YRST0.00.00.11.73.86.73.60.90.1TT16.9

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