2001 Flagstaff, Arizona (FLG)

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2001 FLAGSTAFF, ARIZONA (FLG)

Flagstaff, elevation 7,000 feet, is situated on a volcanic plateau at the base of the highest mountains in Arizona. The climate may be classified as vigorous with cold winters, mild, pleasantly cool summers, moderate humidity, and considerable diurnal temperature change. Only limited farming exists due to the short growing season. The stormy months are January, February, March, July, and August.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is September 21 and the average last occurrence in the spring is June 13.

Temperatures in Flagstaff are characteristic of high altitude climates. The average daily range of temperature is relatively high, especially in the winter months, October to March, as a result of extensive snow cover and clear skies. Winter minimum temperatures frequently reach zero or below and temperatures of −25 degrees or less have occurred. Summer maximum temperatures are often above 80 degrees and occasionally, temperatures have exceeded 95 degrees.

The Flagstaff area is semi–arid. Several months have recorded little or no precipitation. Over 90 consecutive days without measurable precipitation have occurred. Annual precipitation ranges from less than 10 inches to more than 35 inches. Winter snowfalls can be heavy, exceeding 100 inches during one month and over 200 inches during the winter season. However, accumulations are quite variable from year to year. Some winter months may experience little or no snow and the winter season has produced total snow accumulations of less than 12 inches.

NORMALS, MEANS, AND EXTREMES

FLAGSTAFF, AZ (FLG)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 03103

35 08′ 25″ N  111 40′ 20″ W  GRND: 7000  BARO: 7003  MOUNTAIN (UTC + 7)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3042.245.349.257.867.478.281.979.373.263.451.143.361.0
MEAN DAILY MAXIMUM5142.445.049.757.967.477.981.779.074.063.550.943.561.1
HIGHEST DAILY MAXIMUM5266717380879697929085746897
YEAR OF OCCURRENCE197119861988199219741970197319781950198019771950JUL 1973
MEAN OF EXTREME MAXS.5257.359.563.971.778.488.690.087.583.376.065.258.473.3
NORMAL DAILY MINIMUM3015.217.721.326.733.341.450.548.941.231.022.415.830.4
MEAN DAILY MINIMUM5115.817.921.727.033.241.150.249.141.330.821.416.330.5
LOWEST DAILY MINIMUM52-22-23-16–2022322423–2-13-23-23
YEAR OF OCCURRENCE197119851966197519961955195519681971197119581990DEC 1990
MEAN OF EXTREME MINS.52–5.0–.94.713.921.229.140.840.429.418.45.3–2.916.2
NORMAL DRY BULB3028.731.535.342.350.459.866.364.157.347.236.829.645.8
MEAN DRY BULB5229.231.635.842.650.559.666.064.057.547.336.530.045.9
MEAN WET BULB4824.226.729.433.839.545.153.653.447.538.130.024.637.2
MEAN DEW POINT4815.717.719.120.924.628.544.046.138.727.420.315.426.5
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.01.71.80.40.00.00.00.03.9
MAXIMUM 32304.52.61.60.20.00.00.00.00.00.21.15.215.4
MINIMUM 323030.427.529.925.213.92.90.00.12.818.728.030.3209.7
MINIMUM 0303.21.20.70.10.00.00.00.00.0*0.42.48.0
H/CNORMAL HEATING DEG. DAYS301125938921681453187296523755284610977131
NORMAL COOLING DEG. DAYS30000003170386000145
RHNORMAL (PERCENT)3062605546393451585553576153
HOUR 05 LST3072737165625368777470707169
HOUR 11 LST3052494535292335403938445040
HOUR 17 LST3050454132262139433736445039
HOUR 23 LST3069686355474060686663656861
SPERCENT POSSIBLE SUNSHINE1577737682888675768179757378
W/OMEAN NO. DAYS WITH:
HEAVY FOG (VISBY 1/4 MI)372.52.12.01.60.30.00.30.30.51.21.32.014.1
THUNDERSTORMS370.00.40.71.42.33.315.015.26.62.00.60.247.7
CLOUDINESSMEAN:
SUNRISE–SUNSET (OKTAS)25.64.44.81.62.43.24.84.4
MIDNIGHT–MIDNIGHT (OKTAS)15.65.60.82.43.24.80.03.24.0
MEAN NO. DAYS WITH:
CLEAR110.06.09.01.03.02.06.014.06.0
PARTLY CLOUDY15.08.05.02.03.07.03.05.0
CLOUDY14.08.08.05.06.03.07.0
PRMEAN STATION PRESSURE(IN)1123.2323.2223.1623.1823.2323.2923.3823.3823.3323.3123.2523.2623.27
MEAN SEA–LEVEL PRES. (IN)4830.1330.0829.9829.9429.9229.9130.0030.0130.0030.0630.1030.1230.02
WINDSMEAN SPEED (MPH)225.96.16.47.07.16.65.24.34.85.25.85.85.9
PREVAIL. DIR (TENS OF DEGS)621212221212121212121212121
MAXIMUM 2–MINUTE:
SPEED (MPH)736333838363432303138373438
DIR. (TENS OF DEGS)22071921202007092104061904
YEAR OF OCCURRENCE199619991995200120011995200019982000199920001996OCT 1999
MAXIMUM 5–SECOND:
SPEED (MPH)745454948444440374453524653
DIR. (TENS OF DEGS)24181921232107332004261904
YEAR OF OCCURRENCE199619981995200120011995200019982000199920011998OCT 1999
PRECIPITATIONNORMAL (IN)302.042.092.551.480.720.402.782.752.031.611.952.4022.80
MAXIMUM MONTHLY (IN)529.5510.056.755.624.142.926.628.066.759.866.647.3010.05
YEAR OF OCCURRENCE199319931970196519921955198619861983197219851967FEB 1993
MINIMUM MONTHLY (IN)520.00TTTT0.00T0.260.00T0.00T0.00
YEAR OF OCCURRENCE197219671972199119741971199319621995195219991958NOV 1999
MAXIMUM IN 24 HOURS (IN)522.714.482.961.791.112.792.553.043.432.733.693.114.48
YEAR OF OCCURRENCE199319931970198519651956196419861965197219781951FEB 1993
NORMAL NO. DAYS WITH:
PRECIPITATION 0.01307.77.19.26.04.82.811.911.67.45.05.57.486.4
PRECIPITATION 1.00300.30.30.30.2*0.00.50.50.50.40.40.64.0
SNOWFALLNORMAL (IN)3020.519.024.411.91.90.00.00.00.12.510.717.8108.8
MAXIMUM MONTHLY (IN)4663.445.579.458.38.2TT0.32.024.740.786.086.0
YEAR OF OCCURRENCE198019901991196519751993199219921965197119851967DEC 1967
MAXIMUM IN 24 HOURS (IN)4623.123.126.317.26.6TT0.32.013.519.627.327.3
YEAR OF OCCURRENCE198019871970197719651993199219921965197419911967DEC 1967
MAXIMUM SNOW DEPTH (IN)45344037318000T11236666
YEAR OF OCCURRENCE197919791969197319541965197419751967DEC 1967
NORMAL NO. DAYS WITH:
SNOWFALL 1.0304.14.25.42.60.60.00.00.00.*0.62.24.123.8
PRECIPITATION (inches) 2001 FLAGSTAFF, AZ (FLG)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.000.02T0.720.141.931.902.820.819.862.344.1324.67
19731.893.696.181.211.170.401.871.25T0.031.900.1219.71
19743.630.261.010.57TT3.002.160.933.641.031.1817.41
19751.761.902.922.201.160.052.240.741.890.332.961.9520.10
19760.175.962.063.091.65T3.820.581.160.730.100.8020.12
19771.850.840.921.470.960.913.603.721.521.040.761.1818.77
19784.094.675.581.600.270.091.170.680.460.566.165.3930.72
19795.541.732.520.312.160.180.792.380.131.301.141.5019.68
19806.527.814.161.211.790.252.492.190.651.08T1.1529.30
19811.311.164.041.500.721.092.873.732.541.812.430.1723.37
19824.622.555.690.250.86T1.892.323.170.715.363.6731.09
19831.613.044.362.180.060.282.863.536.750.751.532.5229.47
19840.360.130.890.730.210.134.203.861.751.431.405.0020.09
19852.381.672.543.390.260.092.361.073.682.446.640.1526.67
19860.311.762.601.230.721.166.628.064.802.021.681.4332.39
19872.512.541.690.210.700.251.933.741.494.642.911.3723.98
19881.642.300.143.830.141.863.484.770.151.231.141.0021.68
19891.841.352.080.010.620.232.283.400.301.28T1.0514.44
19901.543.202.172.320.730.244.321.716.180.491.091.6825.67
19911.762.086.00T0.140.591.041.640.261.124.472.7321.83
19922.033.694.400.784.140.322.675.80T3.640.466.7834.71
19939.5510.051.540.260.440.55T4.191.953.293.020.7635.60
19940.382.473.032.481.011.703.612.751.121.911.43
19952.393.773.991.490.440.060.612.300.000.010.310.3515.72
19960.191.360.540.07TT1.790.923.730.930.64
19973.210.990.030.600.080.180.212.833.681.150.801.8515.61
19981.302.153.741.521.310.004.722.824.453.111.760.4227.30
19990.280.480.532.800.420.953.272.454.54T0.00T15.72
20000.621.613.120.190.121.110.292.830.363.851.070.2115.38
20012.601.681.281.400.820.032.803.460.681.210.431.1617.55
POR=102 YRS2.002.052.121.320.710.502.682.881.861.561.471.9721.02
AVERAGE TEMPERATURE (F) 2001 FLAGSTAFF, AZ (FLG)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197228.431.840.039.846.457.666.562.956.745.929.621.944.0
197322.928.726.838.052.860.565.764.657.750.037.133.044.8
197427.830.540.443.254.866.566.364.758.747.936.826.847.0
197527.727.633.236.247.557.165.963.557.946.537.329.244.1
197630.635.135.441.452.858.966.562.857.147.039.531.646.6
197726.834.233.544.747.462.267.266.260.250.841.037.647.7
197831.530.740.342.249.461.466.663.757.349.834.624.346.0
197922.625.932.340.747.957.864.160.558.847.831.231.243.4
198030.732.832.341.945.660.969.066.359.749.041.439.947.5
198136.236.336.648.552.166.168.265.458.746.741.836.449.4
198228.330.535.343.549.957.163.865.657.644.035.228.144.9
198331.032.336.237.049.957.365.563.860.748.636.934.046.1
198431.732.838.340.756.858.565.763.859.342.435.329.046.2
198527.528.935.546.251.562.667.265.353.147.733.832.446.0
198637.034.239.744.152.061.264.065.753.043.537.630.246.9
198727.631.132.845.950.761.362.862.856.550.436.227.145.4
198829.134.237.444.050.861.567.464.355.952.536.927.946.8
198926.232.341.850.454.260.868.163.658.747.538.431.647.8
199028.629.338.346.150.364.466.962.659.848.937.625.146.5
199130.537.232.243.149.457.367.166.559.650.836.930.246.7
199227.335.238.149.153.359.065.164.259.350.433.826.346.8
199332.232.540.246.453.960.465.564.857.947.435.030.147.2
199432.829.840.644.351.765.466.458.144.232.232.1
199528.437.238.240.455.164.666.947.742.331.9
199631.436.937.844.961.9
199728.029.639.140.554.157.163.863.859.445.037.726.645.4
199831.427.233.737.246.855.066.264.957.344.637.131.144.4
199933.935.139.037.549.458.064.262.156.147.740.529.346.1
200032.935.635.446.655.462.266.565.060.146.230.834.747.6
200127.229.739.043.555.362.265.664.359.950.238.827.046.9
POR=102 YRS28.431.235.842.850.659.465.863.957.447.136.329.845.7

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 FLAGSTAFF, AZ (FLG)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–732278241584105513301297100611768013701648124
1973–7439452124588299871147960754650310676458
1974–7519341955228411178115010419788565362317581
1975–762366207566821110110598629127023701906879
1976–771771230553757102711778589706035401026905
1977–7891915743271584310329547566774781286200
1978–79337322746590712541307108910057225242197825
1979–806815718652610081042105693010096845961587420
1980–81643153491703774886794873486398505657
1981–8213918255868988011309639116404582306681
1982–836522218643888113610469118888354612227335
1983–84266413450283795210259298207222472046462
1984–8521511656958841109115510059115574111027066
1985–86263135153293110058628557776193921196500
1986–875828353661816106911509429905664351147182
1987–888286246447859116711038858486214341246902
1988-89941266381836114111969107104323301396391
1989-9076718454079210301124996822558449846653
1990-9110931674948161231106077210086524762257004
1991–92712159438835107111598548304703561806371
1992-933880163444932119110149037615513391586574
1993–9429452075388931073990979747614406
1994–95351120363797410141128772821731290
1995–96601053167110151035807834597108
1996–972362916209661141984797729330231
1997–9861451616138131182103710509648285593007613
1998-99152722662483210449578297988174802206869
1999–0045862605297261099987846911547293986427
2000–012649148577102093311659838016412951096747
2001–25401494527811172
COOLING DEGREE DAYS (base 65 F) 2001 FLAGSTAFF, AZ (FLG)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197200000476200000100
1973000003469400000143
197400000120663313000232
19750000006028000088
197600000157013000098
19770000028826120000191
1978000002587382000152
197900000104724400085
19800000043133912000269
19810000091108580000257
19820000013646600089
198300000045311200088
198400002144923200090
19850000036102470000185
198600000113355000099
198700000132126000060
1988000002894281000151
19890000022111290000162
19900000076762818000198
199100000079654000148
199200000648620000116
1993000002650461000123
19940000053570000
1995000005376000
1996000018
19970000102914200046
19980000056028000093
19990000015295000049
2000000031881558000165
2001000003050260000106
SNOWFALL (inches) 2001 FLAGSTAFF, AZ (FLG)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–730.00.00.011.823.228.921.033.877.410.93.00.0210.0
1973–740.00.00.0T20.71.235.32.48.81.60.00.070.0
1974–750.00.00.016.68.215.620.118.229.125.18.20.0141.1
1975–760.00.00.0T25.218.91.531.220.431.23.20.0131.6
1976–770.00.00.0T0.79.021.111.28.817.81.60.070.2
1977–780.00.00.00.07.01.640.432.124.59.31.30.0116.2
1978–790.00.00.00.016.519.859.418.122.84.14.80.0145.5
1979–800.00.00.00.55.520.763.432.942.511.6T0.0177.1
1980–810.00.00.06.9T6.811.711.945.69.50.00.092.4
1981–820.00.00.00.047.520.426.71.90.40.0
1982–830.00.0TT22.627.115.325.038.513.60.50.0142.6
1983–840.00.00.00.014.35.84.31.80.35.50.00.032.0
1984–850.00.00.00.69.428.726.231.321.318.50.00.0136.0
1985–860.00.00.00.040.72.60.426.932.81.60.40.0105.4
1986–870.00.00.90.64.89.538.640.725.01.50.00.0121.6
1987–880.00.00.00.02.916.728.921.01.533.10.40.0104.5
1988-890.00.00.00.011.915.021.712.016.6T0.50.077.7
1989-900.0TTTT13.124.245.525.04.21.40.0113.4
1990-91TTTT9.622.33.113.579.4TT0.0127.9
1991–920.00.0T5.939.524.024.724.935.94.0TT158.9
1992-93T0.30.00.52.141.755.735.211.92.30.3T150.0
1993–940.0TT0.023.013.46.926.112.327.8T
1994–950.0T0.00.0
1995–960.00.00.00.00.0
1996–97
1997–98
1998–99
1999–00
2000–01
2001–
POR=46 YRSTT0.12.09.715.620.018.021.59.71.7T98.3

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