2001 Detroit, Metropolitan Airport Michigan (DTW)

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2001 DETROIT, METROPOLITAN AIRPORT MICHIGAN (DTW)

Detroit and the immediate suburbs, including nearby urban areas in Canada, occupy an area approximately 25 miles in radius. The waterway, consisting of the Detroit and St. Clair Rivers, Lake St. Clair, and the west end of Lake Erie, lies at an elevation of 568 to 580 feet above sea level. Nearly flat land slopes up gently from the waters edge northwestward for about 10 miles and then gives way to increasingly rolling terrain. The Irish Hills, parallel to and about 40 miles northwest of the waterway, have tops 1,000 to 1,250 feet above sea level. On the Canadian side of the waterway the land is relatively level.

Northwest winds in winter bring snow flurry accumulations to all of Michigan except in the Detroit Metropolitan area while summer showers moving from the northwest weaken and sometimes dissipate as they approach Detroit. On the other hand, much of the heaviest precipitation in winter comes from southeast winds, especially to the northwest suburbs of the city.

The climate of Detroit is influenced by its location with respect to major storm tracks and the influence of the Great Lakes. The normal wintertime storm track is south of the city, which brings on the average, about 3 inch snowfalls. Winter storms can bring combinations of rain, snow, freezing rain, and sleet with heavy snowfall accumulations possible at times. In summer, most storms pass to the north allowing for intervals of warm, humid, sunny skies with occasional thunderstorms followed by days of mild, dry, and fair weather. Temperatures of 90 degrees or higher are reached during each summer.

The most pronounced lake effect occurs in the winter when arctic air moving across the lakes is warmed and moistened. This produces an excess of cloudiness but a moderation of cold wave temperatures.

Local climatic variations are due largely to the immediate effect of Lake St. Clair and the urban heat island. On warm days in late spring or early summer, lake breezes often lower temperatures by 10 to 15 degrees in the eastern part of the city and the northeastern suburbs. The urban heat island effect shows up mainly at night where minimum temperatures at the Metropolitan Airport average 4 degrees lower than downtown Detroit. On humid summer nights or on very cold winter nights, this difference can exceed 10 degrees.

The growing season averages 180 days and has ranged from 145 days to 205 days. On average, the last freezing temperature occurs in late April while the average first freezing temperature occurs in late October. A freeze has occurred as late as mid–May and as early as late September.

Air pollution comes primarily from heavy industry spread along both shores of the waterway from Port Huron to Toledo. However, wind dispersion is usually sufficient to keep it from becoming a major hazard.

NORMALS, MEANS, AND EXTREMES

DETROIT, MI (DTW)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 94847

42 12′ 55″ N  83 20′ 55″ W  GRND: 628  BARO: 631  EASTERN (UTC + 5)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3030.333.344.457.769.678.983.381.373.961.548.135.258.1
MEAN DAILY MAXIMUM4330.834.044.658.069.879.183.281.373.961.848.135.558.3
HIGHEST DAILY MAXIMUM43627081899310410210098917769104
YEAR OF OCCURRENCE199519991998197719881988198819881976196319681998JUN 1988
MEAN OF EXTREME MAXS.4349.652.669.279.086.192.093.591.988.879.767.255.475.4
NORMAL DAILY MINIMUM3015.617.627.036.847.156.361.359.652.540.932.221.439.0
MEAN DAILY MINIMUM4316.518.727.237.447.957.361.860.552.941.632.622.439.7
LOWEST DAILY MINIMUM43-21-15-4102536413829179-10-21
YEAR OF OCCURRENCE198419851978198219661972196519821974197419691983JAN 1984
MEAN OF EXTREME MINS.43-3.8-.19.723.134.244.150.148.937.626.817.82.624.2
NORMAL DRY BULB3022.925.435.747.358.467.672.370.563.251.240.228.348.6
MEAN DRY BULB4323.626.435.847.758.968.172.471.063.551.740.229.149.0
MEAN WET BULB1823.826.132.642.653.262.066.065.257.847.337.428.245.2
MEAN DEW POINT1818.920.426.035.446.756.661.461.253.542.332.423.539.9
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.42.75.32.70.70.10.00.011.9
MAXIMUM 323017.113.24.10.20.00.00.00.00.00.01.311.747.6
MINIMUM 323029.225.322.610.00.90.00.00.00.15.016.426.5136.0
MINIMUM 0303.82.20.10.00.00.00.00.00.00.00.01.47.5
H/CNORMAL HEATING DEG. DAYS30130511099085312433801610243574411386569
NORMAL COOLING DEG. DAYS3000003811623118648700626
RHNORMAL (PERCENT)3075737066656768727372757771
HOUR 01 LST3078777674767981838480798079
HOUR 07 LST3080797978787982868784828181
HOUR 13 LST3069656154535454565857667160
HOUR 19 LST3073706659565858636868737666
SPERCENT POSSIBLE SUNSHINE3140465253606568676151353152
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)442.52.42.30.90.80.70.61.31.62.01.73.119.9
THUNDERSTORMS440.20.41.63.23.86.05.95.24.11.30.60.432.7
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)
MIDNIGHT-MIDNIGHT (OKTAS)
MEAN NO. DAYS WITH:
CLEAR
PARTLY CLOUDY
CLOUDY
PRMEAN STATION PRESSURE(IN)2929.3029.3129.3029.3029.3029.2929.3029.3029.3029.3229.3129.3129.30
MEAN SEA-LEVEL PRES. (IN)1730.0730.0830.0529.9629.9830.0129.9930.0430.0430.0830.0630.0930.04
WINDSMEAN SPEED (MPH)3911.811.411.711.410.19.28.68.38.89.811.311.210.3
PREVAIL. DIR (TENS OF DEGS)3424232923232322232323242323
MAXIMUM 2-MINUTE:
SPEED (MPH)644514647433253353547454953
DIR. (TENS OF DEGS)22222122222728292724242928
YEAR OF OCCURRENCE199619971996200119991998199820012001199619981998JUL 1998
MAXIMUM 5-SECOND:
SPEED (MPH)653605357554167414556586067
DIR. (TENS OF DEGS)24242424252728292824253128
YEAR OF OCCURRENCE199620011996199720001998199820011997199619981998JUL 1998
PRECIPITATIONNORMAL (IN)301.761.742.552.952.923.613.183.432.892.102.672.8232.62
MAXIMUM MONTHLY (IN)433.925.024.485.406.207.046.027.837.526.765.686.007.83
YEAR OF OCCURRENCE199319901973196119911987196919751986200119821965AUG 1975
MINIMUM MONTHLY (IN)430.270.150.820.920.870.970.590.430.430.350.790.460.15
YEAR OF OCCURRENCE196119691981197119881988197419961960196419761960FEB 1969
MAXIMUM IN 24 HOURS (IN)431.722.411.823.582.872.844.343.214.082.572.203.714.34
YEAR OF OCCURRENCE196719981997200019681983199819642000198519821965JUL 1998
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013013.011.013.212.311.010.59.29.39.89.611.614.1134.6
PRECIPITATION 1.00300.10.20.20.40.60.90.91.00.50.40.30.45.9
SNOWFALLNORMAL (IN)3010.09.26.61.8T0.00.00.00.00.23.010.941.7
MAXIMUM MONTHLY (IN)4229.620.816.19.0T0.00.00.0T2.911.834.934.9
YEAR OF OCCURRENCE197819861965198219941994198019661974DEC 1974
MAXIMUM IN 24 HOURS (IN)4211.110.39.27.4T0.00.00.0T2.95.619.219.2
YEAR OF OCCURRENCE199219651973198219941994198019771974DEC 1974
MAXIMUM SNOW DEPTH (IN)4124189600000161924
YEAR OF OCCURRENCE1999198219821982198019661974JAN 1999
NORMAL NO. DAYS WITH:
SNOWFALL 1.0303.13.12.10.60.00.00.00.00.00.11.13.313.4
PRECIPITATION (inches) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19721.281.002.553.632.683.302.213.073.402.243.193.1131.66
19731.651.084.481.423.724.864.661.671.822.013.213.5134.09
19743.262.374.202.753.492.380.592.952.220.812.864.0031.88
19752.902.651.662.502.822.391.987.833.181.292.393.0034.59
19761.912.874.243.153.263.261.471.683.662.010.790.7929.09
19770.981.643.574.172.403.163.282.234.231.372.882.9732.88
19783.160.452.052.493.582.691.971.731.822.492.412.8127.65
19791.520.572.444.972.824.044.962.990.941.244.192.3633.04
19800.691.003.884.233.226.424.336.092.941.260.882.3037.24
19810.573.130.823.442.603.334.292.325.473.921.262.3833.53
19823.431.103.141.602.834.114.780.722.551.015.683.2934.24
19830.840.891.874.205.474.884.531.572.492.854.283.7837.65
19840.781.313.122.483.621.040.953.002.302.282.492.9026.27
19852.633.834.422.113.111.623.964.882.593.915.511.5140.08
19861.303.462.292.731.365.752.473.527.523.051.882.2837.61
19872.350.532.192.142.507.042.206.872.692.003.174.6038.28
19881.302.021.161.500.870.972.433.133.653.574.291.9726.86
19891.280.772.162.224.163.794.212.143.031.732.531.2429.26
19901.805.021.912.723.744.921.473.856.064.142.644.3742.64
19911.440.941.412.666.201.891.234.310.904.142.611.9129.64
19921.781.543.344.341.332.355.912.505.552.014.332.3537.33
19933.921.272.123.321.246.052.171.604.262.211.690.7830.63
19942.791.382.294.041.183.973.203.302.381.352.742.3931.01
19952.470.891.733.443.551.553.403.710.623.533.080.8528.82
19961.851.761.563.392.822.372.640.434.421.591.992.5727.39
19971.573.903.221.565.233.172.683.223.411.910.941.6132.42
19982.603.563.623.862.462.695.724.191.501.411.361.1634.13
19993.001.981.125.132.205.463.621.313.111.561.492.2232.20
20001.290.841.554.355.114.905.404.636.713.051.692.6342.15
20010.692.880.933.203.703.401.162.874.286.762.352.2334.45
POR=43 YRS1.921.812.403.133.003.613.183.232.972.282.482.5332.54
AVERAGE TEMPERATURE (F) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197223.824.632.644.660.364.271.269.163.047.337.429.447.3
197328.825.343.348.855.569.972.672.964.956.241.428.750.7
197426.523.635.749.255.265.972.572.359.748.840.628.648.2
197528.327.532.540.962.869.072.272.359.152.946.829.149.5
197619.233.340.450.056.470.672.770.262.147.433.521.548.1
197712.825.241.552.464.465.575.870.665.147.940.525.548.9
197819.616.330.045.559.366.870.671.967.550.240.528.947.3
197918.616.537.744.656.566.670.467.962.650.139.531.946.9
198024.522.231.345.959.863.772.772.763.846.337.426.047.2
198119.028.836.549.855.968.072.470.060.947.641.127.848.2
198217.120.733.043.264.364.272.467.761.852.641.637.348.0
198328.731.638.444.254.468.274.573.664.051.641.220.849.3
198418.033.328.947.854.570.870.872.761.254.938.634.048.8
198520.423.538.451.060.162.871.369.264.353.042.422.248.2
198623.924.637.650.661.367.375.068.965.952.637.331.749.7
198726.129.639.850.863.371.376.171.664.646.643.533.651.4
198823.823.436.948.562.070.477.175.163.346.042.228.749.8
198932.824.135.245.157.567.573.069.961.952.138.218.047.9
199033.630.739.549.056.668.572.271.264.552.844.232.851.3
199125.031.240.352.066.572.474.973.463.154.838.532.152.0
199228.330.835.546.358.365.568.866.761.449.740.533.248.8
199329.424.234.747.860.267.575.574.561.051.941.230.849.9
199417.323.537.151.258.772.374.269.666.253.845.535.450.4
199528.424.939.245.759.771.674.877.262.855.135.525.650.0
199624.326.030.845.256.770.770.672.964.152.034.331.548.3
199723.030.637.245.852.069.572.268.162.751.837.132.248.5
199832.836.739.550.465.669.173.473.268.053.843.835.353.5
199923.132.834.850.762.470.876.870.265.551.645.232.051.3
200024.631.944.048.061.869.470.370.862.555.140.219.349.8
200126.229.735.151.261.269.673.674.162.352.547.635.951.6
POR=43 YRS23.626.535.847.859.067.972.571.063.551.640.229.249.1

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 OBSTRUCTIONSS 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 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73242811353982210961115110366748028936279
1973-7401098276702111911891152901476308546285
1974-7502189495726112311291043996714142416600
1975-76401783755371107141391475747326966033
1976-77115133540938134116091106721395122857006
1977-78117855247291218140013571077580235657288
1978-7917073452728111214321355843604291556962
1979-80122912647175810191249123310365681911046796
1980-8100110578822120114181008878452293196779
1981-823916753471011441477123798564775707058
1982-832391453836968521119928816618323595980
1983-846012541870813671450912111250733496948
1984-8511416431078595513771154818435177936283
1985-8628129366672131712711125842435166486381
1986-871337638082410281198984776423158115892
1987-884306956663996912731201864486138466285
1988-89239059067911189911138916591254336405
1989-900111514007971451966955785506258276307
1990-9111112380618994123493976139412555564
1991-920015131978810131129985906555224596129
1992-93153015346972597610971138931506161516252
1993-9402155404710105014721156858433238246502
1994-95095534557991011291115793573170175695
1995-9620125306877121512531122105558928986841
1996-973010239791510331297959855566394256546
1997-98313103435830100899178779143169805541
1998-9902443506299141293898927424115335629
1999-00038141358510161246958645504159315641
2000-0111314830773714121194983920415146456321
2001-90131382514898
COOLING DEGREE DAYS (base 65 F) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720000367322216059000550
1973000321562412611041100778
19740008109123723736100620
19750000821712332327600731
1976000301018224618253300706
19770002510810734119894000873
1978000063122200221154000760
1979000032109184124571600522
19800003386924624879300686
198100011711824116851000596
19820000585523712957500541
198300020160306272104600850
198400001518919725255200710
1985000253232201146116000552
19860001055120319160110300777
1987000411120735524564010987
1988000052214385322468001027
198900002911425617164500639
19900013281392342001011100726
1991000101792333152681049001118
1992000027801439151000392
199300002113533430241500838
1994000244924829016097200870
1995000011222312383677001002
199600023718518425182000741
199700000165231114402900579
1998007095209268261136900985
1999000043213372171104200905
200000306617217019978400692
200100063619027929058400863
SNOWFALL (inches) 2001 DETROIT, METROPOLITAN AIRPORT MI (DTW)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.0T7.112.52.412.810.10.1T0.045.0
1973-740.00.00.00.00.116.414.111.25.71.7T0.049.2
1974-750.00.00.0T7.734.94.97.54.53.60.00.063.1
1975-760.00.00.00.06.519.815.14.97.52.1T0.055.9
1976-770.00.00.0T1.49.814.75.012.30.70.00.043.9
1977-780.00.00.00.07.416.629.65.32.50.30.00.061.7
1978-790.00.00.00.06.16.613.33.92.73.00.00.035.6
1979-800.00.00.0T3.22.32.85.511.71.40.00.026.9
1980-810.00.00.02.93.410.57.613.40.60.00.00.038.4
1981-820.00.00.00.10.717.320.013.313.69.00.00.074.0
1982-830.00.00.0T1.81.41.54.37.63.40.00.020.0
1983-840.00.00.00.03.519.99.98.79.70.10.00.051.8
1984-850.00.00.00.04.16.220.916.96.10.90.00.055.1
1985-860.00.00.00.02.014.18.620.87.41.30.00.054.2
1986-870.00.00.0T3.36.024.02.013.31.10.00.049.7
1987-880.00.00.0T0.715.37.019.22.70.20.00.045.1
1988-890.00.00.0T1.06.35.39.62.40.5T0.025.1
1989-900.00.00.02.72.411.84.011.17.82.00.00.041.8
1990-910.00.0T0.0T13.28.89.20.2TT0.031.4
1991-920.00.00.0T2.28.618.42.411.70.20.00.043.5
1992-930.00.00.00.40.95.011.015.215.74.00.00.052.2
1993-940.00.00.00.40.61.917.917.13.74.2T0.045.8
1994-950.00.0T0.0T9.613.15.73.51.60.00.033.5
1995-960.00.00.00.01.34.56.311.8
1996-97
1997-984.66.08.3T4.40.0T0.0
1998-990.00.0T0.00.01.227.37.813.20.00.00.049.5
1999-000.00.00.0TT4.09.68.11.10.6T0.023.4
2000-010.00.00.0T1.325.13.42.95.40.90.00.039.0
2001-0.00.00.0T0.04.9
POR=41 YRS0.00.0T0.22.69.910.38.76.71.7T0.040.1

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