2001 Las Vegas, Nevada (LAS)

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2001 LAS VEGAS, NEVADA (LAS)

Las Vegas is situated near the center of a broad desert valley, which is almost surrounded by mountains ranging from 2,000 to l0,000 feet higher than the floor of the valley. This Vegas Valley, comprising about 600 square miles, runs from northwest to southeast, and slopes gradually upward on each side toward the surrounding mountains. Weather observations are taken at McCarran Airport, 7 miles south of downtown Las Vegas, and about 5 miles southwest and 300 feet higher than the lower portions of the valley. Since mountains encircle the valley, drainage winds are usually downslope toward the center, or lowest portion of the valley. This condition also affects minimum temperatures, which in lower portions of the valley can be from 15 to 25 degrees colder than recorded at the airport on clear, calm nights.

The four seasons are well defined. Summers display desert conditions, with maximum temperatures usually in the 100 degree range. The proximity of the mountains contributes to the relatively cool summer nights, with the majority of minimum temperatures in the mid 70s. During about 2 weeks almost every summer warm, moist air predominates in this area, and causes scattered thunderstorms, occasionally quite severe, together with higher than average humidity. Soil erosion, especially near the mountains and foothills surrounding the valley, is evidence of the intensity of some of the thunderstorm activity. Winters, on the whole, are mild and pleasant. Daytime temperatures average near 60 degrees with mostly clear skies. The spring and fall seasons are generally considered most ideal, although rather sharp temperature changes can occur during these months. There are very few days during the spring and fall months when outdoor activities are affected in any degree by the weather.

The Sierra Nevada Mountains of California and the Spring Mountains immediately west of the Vegas Valley, the latter rising to elevations over 10,000 feet above the valley floor, act as effective barriers to moisture moving eastward from the Pacific Ocean. It is mainly these barriers that result in a minimum of dark overcast and rainy days. Rainy days average less than one in June to three per month in the winter months. Snow rarely falls in this valley and it usually melts as it falls, or shortly thereafter. Notable exceptions have occurred.

Strong winds, associated with major storms, usually reach this valley from the southwest or through the pass from the northwest. Winds over 50 mph are infrequent but, when they do occur, are probably the most provoking of the elements experienced in the Vegas Valley, because of the blowing dust and sand associated with them.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is November 21 and the average last occurrence in the spring is March 7.

NORMALS, MEANS, AND EXTREMES

LAS VEGAS, NV (LAS)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 23169

36 04′ 44″ N  115 09′ 19″ W  GRND: 2127  BARO: 2091  PACIFIC (UTC + 8)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3057.363.368.877.587.8100.3105.9103.294.782.167.457.580.5
MEAN DAILY MAXIMUM5356.462.469.278.187.798.4104.0102.094.381.266.257.179.7
HIGHEST DAILY MAXIMUM53778791991091151161161131038777116
YEAR OF OCCURRENCE197519861966200019511994199819791950197819881980JUL 1998
MEAN OF EXTREME MAXS.5367.974.582.792.2100.9110.0112.2110.0104.894.379.268.191.4
NORMAL DAILY MINIMUM3033.638.843.850.760.269.476.274.266.254.342.633.953.7
MEAN DAILY MINIMUM5334.338.944.151.560.769.976.474.966.654.342.034.554.0
LOWEST DAILY MINIMUM53816233140486056462621118
YEAR OF OCCURRENCE196319891971197519641993198719681965197119521990JAN 1963
MEAN OF EXTREME MINS.5323.327.532.539.647.656.766.765.955.442.230.124.242.6
NORMAL DRY BULB3045.551.156.364.174.084.991.188.780.568.355.045.767.1
MEAN DRY BULB5345.450.756.664.674.284.190.388.580.467.954.145.766.9
MEAN WET BULB1838.241.545.548.954.358.863.860.658.648.042.434.749.6
MEAN DEW POINT1825.227.328.327.732.335.043.643.039.329.826.621.131.6
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.0*3.315.325.830.529.921.85.60.00.0132.2
MAXIMUM 32300.10.00.00.00.00.00.00.00.00.00.0*0.1
MINIMUM 323013.04.71.30.10.00.00.00.00.00.12.211.432.8
MINIMUM 0300.00.00.00.00.00.00.00.00.00.00.00.00.0
H/CNORMAL HEATING DEG. DAYS30605389292143140000623045982407
NORMAL COOLING DEG. DAYS300022116293597809735465164003201
RHNORMAL (PERCENT)3045403325211621262529374530
HOUR 04 LST3055504435312429353438465440
HOUR 10 LST3041362922191519242225334027
HOUR 16 LST3030262116131015171719263220
HOUR 22 LST3049423526221722262631404932
SPERCENT POSSIBLE SUNSHINE4777818387889388889187817885
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)540.30.10.10.00.00.00.00.00.00.00.10.10.7
THUNDERSTORMS540.00.20.40.51.01.03.83.81.50.50.20.012.9
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)11.60.80.0
MIDNIGHT-MIDNIGHT (OKTAS)10.8
MEAN NO. DAYS WITH:
CLEAR14.01.09.027.016.0
PARTLY CLOUDY12.03.06.01.0
CLOUDY11.03.01.01.0
PRMEAN STATION PRESSURE(IN)2927.8027.7927.7027.6027.6027.6027.6027.6027.6027.7027.8027.8127.68
MEAN SEA LEVEL PRES. (IN)1830.1330.0429.9429.8729.7929.9729.8029.8329.8529.9530.0630.1529.95
WINDSMEAN SPEED (MPH)377.48.610.311.011.411.410.49.89.08.17.77.09.3
PREVAIL. DIR (TENS OF DEGS)2225252422222018182424242524
MAXIMUM 2-MINUTE:
SPEED (MPH)645464644564745434146404856
DIR. (TENS OF DEGS)23223321223303321633243422
YEAR OF OCCURRENCE199620012001199920001998199819981998199620012000MAY 2000
MAXIMUM 5-SECOND:
SPEED (MPH)652545651645454614952495664
DIR. (TENS OF DEGS)24203434263304162333243326
YEAR OF OCCURRENCE199920012000199720001998199819981998199620011999MAY 2000
PRECIPITATIONNORMAL (IN)300.480.480.420.210.280.120.350.490.280.210.430.384.13
MAXIMUM MONTHLY (IN)533.002.894.802.440.960.972.482.592.061.222.221.714.80
YEAR OF OCCURRENCE199519981992196519691990198419571997199219651992MAR 1992
MINIMUM MONTHLY (IN)53T0.000.000.000.000.000.000.000.000.000.000.000.00
YEAR OF OCCURRENCE198419771972196219701982198119801971197919801981JUN 1982
MAXIMUM IN 24 HOURS (IN)531.091.301.270.970.830.971.362.591.071.091.780.952.59
YEAR OF OCCURRENCE199019931992196519871990198419571963199219601977AUG 1957
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01302.92.83.31.91.50.82.43.11.91.82.12.627.1
PRECIPITATION 1.00300.0*0.00.00.00.00.10.1*0.00.10.00.3
SNOWFALLNORMAL (IN)300.80.10.*0.00.00.00.00.00.00.00.10.11.1
MAXIMUM MONTHLY (IN)4816.71.40.1T0.00.00.0T0.0T4.02.016.7
YEAR OF OCCURRENCE19491990197619701989195619641967JAN 1949
MAXIMUM IN 24 HOURS (IN)489.06.90.1T0.00.00.0T0.0T4.02.09.0
YEAR OF OCCURRENCE19741979197619701989195619641967JAN 1974
MAXIMUM SNOW DEPTH (IN)478600000000328
YEAR OF OCCURRENCE1974197919641967JAN 1974
NORMAL NO. DAYS WITH:
SNOWFALL 1.0300.20.*0.00.00.00.00.00.00.00.00.10.*0.3
PRECIPITATION (inches) 2001 LAS VEGAS, NV (LAS)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.00T0.000.070.460.320.130.840.631.121.090.194.85
19730.491.641.830.350.090.03T0.08T0.020.140.014.68
19742.000.110.16TT0.000.580.080.160.610.230.594.52
19750.010.051.070.420.35T0.260.061.170.03T0.053.47
19760.002.490.020.130.340.001.950.001.090.700.020.036.77
19770.210.000.280.010.720.05T1.380.190.060.011.063.97
19781.001.511.130.360.540.000.190.530.030.620.591.157.65
19792.180.070.960.060.350.000.782.12T0.000.030.246.79
19801.452.250.940.180.15T0.430.000.180.040.000.015.63
19810.090.201.440.020.50T0.000.200.250.150.290.003.14
19820.091.100.290.010.310.000.050.710.070.040.600.723.99
19830.430.320.900.450.16T0.061.250.500.260.100.434.86
1984T0.03T0.040.000.222.480.990.47T0.941.686.85
19850.190.020.060.31T0.020.130.000.080.070.370.021.27
19860.230.150.320.100.28T0.130.040.050.070.810.472.65
19871.130.450.490.170.900.130.130.01T0.491.800.896.59
19880.650.260.000.76T0.040.040.46T0.00T0.082.29
19890.510.060.05T0.64T0.050.80TT0.00T2.11
19901.180.37T0.18T0.970.59T0.190.170.10T3.75
19910.210.541.01T0.050.190.540.780.060.060.380.244.06
19920.451.304.800.020.050.090.030.210.001.220.001.719.88
19931.632.520.140.010.010.080.000.260.000.020.170.215.05
19940.040.480.13T0.010.000.110.080.35T0.281.082.56
19953.000.030.390.030.160.02T0.05TT0.000.013.69
19960.130.140.100.000.13T1.18T0.000.110.790.182.76
19970.30T0.000.04TT0.600.332.06T0.230.073.63
19980.172.891.030.140.130.030.460.231.290.220.330.437.35
1999T0.08T0.73T0.142.180.250.35T0.00T3.73
2000T1.590.21TTTT0.710.000.92T0.043.47
20010.872.210.160.040.02T0.390.05T0.000.090.113.94
POR= 65 YRS0.540.540.490.220.180.080.440.400.350.220.310.384.15
AVERAGE TEMPERATURE (F) 2001 LAS VEGAS, NV (LAS)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197242.352.063.765.174.584.793.186.578.063.549.741.366.2
197340.949.650.762.276.785.291.787.678.967.753.446.265.9
197441.048.959.563.477.089.188.887.783.469.354.844.467.3
197545.348.853.956.672.583.890.387.581.766.153.048.265.6
197646.953.253.462.677.881.586.985.578.766.558.046.466.5
197745.754.252.668.667.788.092.490.180.671.457.251.968.4
197847.952.159.963.173.187.191.989.079.073.554.242.967.8
197941.148.456.066.175.485.591.185.985.370.751.647.267.0
198049.553.254.263.569.083.992.090.281.468.956.852.767.9
198151.152.556.470.674.388.892.790.082.564.458.048.869.2
198245.650.555.163.873.681.588.187.377.963.050.544.565.1
198346.651.756.458.572.882.888.583.882.567.855.347.966.2
198447.150.157.963.180.783.588.285.481.763.052.744.066.5
198544.447.454.968.276.987.492.089.975.467.351.748.367.0
198651.755.863.066.276.687.887.691.275.465.055.846.068.5
198744.751.454.668.474.586.386.988.281.271.053.442.566.9
198845.152.458.164.273.485.392.686.979.174.956.046.067.8
198943.950.063.472.775.785.393.486.980.067.257.348.068.7
199045.248.860.568.874.585.990.887.882.069.255.140.267.4
199145.555.952.764.269.982.190.287.881.972.255.247.067.1
199245.954.156.870.577.783.288.790.583.770.952.743.668.2
199345.750.160.967.577.082.589.488.581.369.151.546.367.5
199449.348.562.767.676.690.393.392.983.167.249.447.569.0
199547.558.757.964.871.080.992.493.183.769.459.848.969.0
199648.554.859.868.377.387.093.291.980.466.856.547.969.4
199748.351.762.765.481.684.388.290.781.367.356.245.968.6
199848.749.456.661.170.080.091.792.080.066.654.847.866.6
199950.552.760.660.975.385.288.288.081.671.658.848.768.5
200051.453.658.671.280.888.792.390.581.767.350.249.569.7
200146.449.860.665.082.287.990.391.985.172.158.645.469.6
POR= 65 YRS45.250.156.364.574.183.689.988.280.167.653.745.966.6

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 LAS VEGAS, NV (LAS)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730001084537277444284371321203041
1973-7400042349576738443188821302431
1974-75000553006346074463402493702668
1975-7600073354516553339357124102317
1976-7700039212569593297374455602185
1977-780003226399522356168911601781
1978-790012324676737458270661802552
1979-80000443955464743353281083202262
1980-810008225537442634426329201775
1981-820007421449759439830198902185
1982-830010844296315643642631982102564
1983-840003297524548424216111002123
1984-8500012736364162948730841002596
1985-8600131393512404270125571101804
1986-8700145326858662237531640102275
1987-8800018342689612357225833302359
1988-890000291581647425118231602101
1989-900007022451960644917212002052
1990-9100023290761597247376572522378
1991-92000772975525843082487002073
1992-930001636465559141014332382222
1993-94000333985734804559360102093
1994-9500035465537537170230901862088
1995-9600022151490504287169221101656
1996-97000138249524512368115117002023
1997-98000572595835004262701662302284
1998-9900039296525444337143188561983
1999-000001118449941232519516301645
2000-0100080436474570421175114202272
2001-0000204602
COOLING DEGREE DAYS (base 65 F) 2001 LAS VEGAS, NV (LAS)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197202668030859787667539869003071
197300054382612833708424134803155
1974002443394731744713559195003403
19750022276570792704508117202973
19760025740450068764141993602809
1977000161149694858781476210303332
1978001740277672841752425268803300
1979000104346625813656614229003387
1980000681605758427884982111503157
1981005205296721866781531641203481
19820027028150172169940430002708
19830029269541735589534941002783
19840036149656372464150874103071
1985000143377678844778319110203251
1986020699837969370782133259003178
1987000148302645685729495211003215
19880016643006158646854343123103321
198901174259351614887687456143003482
19900042134302634810713516163003314
1991000421875247887145153071203089
1992000180402552742798571206303454
19930021114381537765737494166003215
19940031145369768883870551108003725
1995001391211490856880570168203281
19960316129402665883841471201003611
19970048136522584727805494137403457
199800185518645783484245695002943
1999001374333620726719508221303217
2000003208498719851799509158003745
200100471225416927928436092311703894

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.

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