2001 Eureka, California (EKA)

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2001 EUREKA, CALIFORNIA (EKA)

Humboldt Bay is one–quarter mile north and one mile west of the station. There are no hills in Eureka of any consequence. The land slopes upward gently from the Bay toward the Coast Range, which begins about 3 miles east of the station and reaches the top of its first ridge approximately 10 miles to the east. The elevation of the ridge is 2,000 feet and extends in a semicircle from a point 20 miles north of Eureka to a point 25 miles south.

The climate of Eureka is completely maritime with high humidity prevailing the entire year. There are definite rainy and dry seasons. The rainy season begins in October and continues through April, accounting for about 90 percent of the annual precipitation. The dry season from May through September is marked by considerable fog or low cloudiness that usually clears in the late morning and sunny weather is generally the case during the early afternoon hours.

Temperatures are moderate the entire year. Although record highs have reached the mid 80s and record lows near 20 degrees, the usual yearly range is from lows in the mid 30s to highs in the mid 70s.

The principal industries are lumbering, fishing, tourism, and dairy farming. There is very little truck farming due to the low temperatures and lack of sunshine, however, the climate is nearly ideal for berries and flowers.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is December 10 and the average last occurrence in the spring is February 6.

NORMALS, MEANS, AND EXTREMES

FRESNO, CA (FAT)

LATITUDE:      LONGITUDE:      ELEVATION (FT):      TIME ZONE:      WBAN: 24213

40 48′ 0 ″ N  124 09′ 0 ″ W    GRND: 19    BARO: 20    PACIFIC (UTC + 8)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3054.455.655.455.957.960.361.862.663.060.858.154.858.4
MEAN DAILY MAXIMUM6054.355.355.256.258.360.461.662.562.860.858.054.958.4
HIGHEST DAILY MAXIMUM9178857880848576828687787787
YEAR OF OCCURRENCE198619301914198919391945199219911983199319871963OCT 1993
MEAN OF EXTREME MAXS.6065.466.465.466.268.568.367.769.873.373.768.164.868.1
NORMAL DAILY MINIMUM3041.542.943.444.347.550.652.353.151.648.645.242.046.9
MEAN DAILY MINIMUM6041.342.643.044.647.850.652.353.051.548.545.041.946.8
LOWEST DAILY MINIMUM9125272932364045444132292121
YEAR OF OCCURRENCE193719901917200119541999192419351946197119941972DEC 1972
MEAN OF EXTREME MINS.6031.733.334.737.241.045.548.249.045.640.635.432.239.5
NORMAL DRY BULB3048.049.349.450.252.855.557.057.957.354.751.748.452.7
MEAN DRY BULB6047.949.049.150.353.055.556.957.857.154.751.548.452.6
MEAN WET BULB
MEAN DEW POINT
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.00.00.00.00.00.00.00.00.00.0
MAXIMUM 32300.00.00.00.00.00.00.00.00.00.00.00.00.0
MINIMUM 32301.60.90.20.00.00.00.00.00.0*0.41.95.0
MINIMUM 0300.00.00.00.00.00.00.00.00.00.00.00.00.0
H/CNORMAL HEATING DEG. DAYS305274404844443782852482232343193995154496
NORMAL COOLING DEG. DAYS300000000000000
RHNORMAL (PERCENT)
HOUR 04 LST
HOUR 10 LST
HOUR 16 LST
HOUR 22 LST
SPERCENT POSSIBLE SUNSHINE8443465257585955515550444151
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)784.02.71.91.61.22.13.55.47.59.56.04.349.7
THUNDERSTORMS780.70.60.40.20.20.20.20.10.30.40.60.64.5
CLOUDINESSMEAN:
SUNRISE–SUNSET (OKTAS)575.85.95.85.65.45.25.15.34.85.15.75.65.4
MIDNIGHT–MIDNIGHT (OKTAS)22.63.20.00.02.60.00.00.02.82.40.02.41.3
MEAN NO. DAYS WITH:
CLEAR915.95.15.66.16.57.26.45.48.68.06.16.377.2
PARTLY CLOUDY916.35.87.98.49.99.710.810.88.68.46.66.599.7
CLOUDY9118.917.417.615.514.713.113.514.312.414.216.917.9186.4
PRMEAN STATION PRESSURE (IN)
MEAN SEA–LEVEL PRES. (IN)
WINDSMEAN SPEED (MPH)546.97.27.68.07.97.46.85.85.55.66.06.46.8
PREVAIL. DIR (TENS OF DEGS)
FASTEST MILE:
SPEED (MPH)8454484849403935344456555656
DIR.SSWSWNNWNWNNNSWSSSW
YEAR OF OCCURRENCE195519601953191519551949198619201941196219811931OCT 1962
PEAK GUST :
SPEED (MPH)
DIR. (TENS OF DEGS)
YEAR OF OCCURRENCE
PRECIPITATIONNORMAL (IN)306.004.735.322.881.440.510.130.480.892.676.446.0437.53
MAXIMUM MONTHLY (IN)9113.9213.9513.9710.686.052.571.343.423.5613.0416.5821.2621.26
YEAR OF OCCURRENCE196919981938196319601954191619831925195019731996DEC 1996
MINIMUM MONTHLY (IN)910.660.500.070.310.030.000.000.000.000.00T0.520.00
YEAR OF OCCURRENCE198519231926195619551917196719401929191719671976JUL 1967
MAXIMUM IN 24 HOURS (IN)914.424.884.022.562.231.731.182.211.545.835.214.865.83
YEAR OF OCCURRENCE191219591975198319431943191619831977195019981996OCT 1950
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013014.313.816.211.47.65.02.13.04.28.715.115.4116.8
PRECIPITATION 1.00301.60.90.80.40.00.10.00.10.10.51.71.37.5
SNOWFALLNORMAL (IN)300.10.20.*T0.00.00.00.00.00.00.*0.10.4
MAXIMUM MONTHLY (IN)913.03.51.0T0.00.00.00.00.00.00.11.93.5
YEAR OF OCCURRENCE193519891966199519771972FEB 1989
MAXIMUM IN 24 HOURS (IN)913.02.01.0T0.00.00.00.00.00.00.11.93.0
YEAR OF OCCURRENCE193519891966199519771972JAN 1935
MAXIMUM SNOW DEPTH (IN)590110000000001
YEAR OF OCCURRENCE19891999MAR 1999
NORMAL NO. DAYS WITH:
SNOWFALL 1.0300.00.10.00.00.00.00.00.00.00.00.00.10.2
PRECIPITATION (inches) 2001 EUREKA, CA (EKA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19727.965.935.082.271.110.880.010.071.061.975.417.4239.17
19736.473.857.100.350.850.23T0.082.354.1416.587.0249.02
19746.025.986.983.150.420.330.110.32T1.762.756.4034.22
19755.207.6810.733.291.050.580.100.580.016.774.725.3846.09
19761.887.513.122.800.540.140.201.700.040.282.980.5221.71
19771.902.244.331.202.100.07T0.203.352.794.516.6029.29
19784.526.062.884.100.820.340.030.592.720.042.391.1625.65
19793.826.261.703.942.250.050.310.131.156.146.193.7535.69
19803.194.676.144.181.700.42T0.070.141.382.496.1030.48
19817.673.724.640.712.020.57T0.010.973.719.399.8843.29
19824.755.767.065.970.070.780.080.030.624.897.8310.3048.14
19838.489.1810.735.471.120.650.893.420.871.8710.4014.1367.21
19840.765.184.702.762.511.070.030.050.553.6715.154.2740.70
19850.663.694.680.451.140.890.150.521.064.072.982.7823.07
19867.1910.086.121.462.340.210.02T2.701.751.853.8337.55
19876.483.386.101.150.410.260.200.060.021.054.2310.9234.26
19887.130.541.182.062.702.220.05T0.120.418.936.2631.60
19894.712.887.632.011.670.210.080.130.852.901.600.8025.47
19907.204.503.301.413.740.320.220.710.191.733.072.9529.34
19911.652.756.942.522.160.261.130.37T1.061.952.3623.15
19923.993.803.512.420.061.270.250.010.332.082.219.3329.26
19937.155.934.725.944.441.230.370.540.030.561.357.1239.38
19945.097.122.063.301.100.710.08T0.060.548.217.0035.27
199512.741.4011.187.471.211.850.080.220.690.532.2611.5651.19
199610.748.113.514.642.400.050.03T1.213.505.1621.2660.61
19978.812.552.733.060.901.25T0.842.052.737.394.7337.04
199813.4213.957.832.233.120.330.160.010.083.0614.095.4063.68
19994.3710.328.941.791.620.150.040.300.051.607.363.0239.56
20009.717.002.812.151.860.540.04T0.552.993.511.9733.13
20013.793.602.452.540.710.690.200.210.281.007.7111.5634.74
POR=115 YRS6.765.735.253.061.860.720.110.210.802.615.426.4338.96
AVERAGE TEMPERATURE (F) 2001 EUREKA, CA (EKA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197244.649.051.249.151.254.657.858.255.854.251.845.751.9
197347.350.747.450.152.055.155.654.857.152.151.451.252.1
197446.746.150.149.751.154.157.757.755.653.251.248.751.8
197545.848.047.646.551.453.256.955.355.254.248.547.450.8
197646.446.945.748.451.152.857.557.956.254.452.247.451.4
197747.450.546.249.251.554.255.158.357.153.851.251.052.1
197851.850.353.551.053.356.055.957.057.654.948.043.352.7
197946.648.050.051.052.754.058.159.462.357.352.451.853.6
198048.353.548.651.952.355.557.355.056.654.351.351.253.0
198152.551.350.250.653.356.555.258.157.954.353.652.153.8
198244.949.548.350.852.856.358.359.658.757.352.149.653.2
198351.353.453.451.854.458.060.561.960.757.953.650.655.6
198449.450.052.851.355.055.257.660.258.355.352.146.853.7
198548.447.947.451.653.956.658.658.556.754.546.647.752.4
198654.352.753.150.753.959.057.457.257.255.653.551.354.7
198749.151.452.754.256.657.759.558.557.357.854.849.754.9
198850.450.250.352.856.357.758.857.755.855.253.347.753.9
198946.045.651.854.655.957.659.459.356.654.952.649.253.6
199048.345.550.252.854.058.259.860.461.654.349.742.853.1
199147.852.848.150.952.253.857.359.957.256.151.448.353.0
199250.353.954.156.456.758.360.659.157.558.051.746.955.3
199346.449.453.453.657.957.957.459.855.856.949.949.554.0
199450.548.551.152.855.557.057.161.459.654.445.646.753.4
199552.451.750.451.153.756.060.258.460.354.953.952.054.6
199649.552.350.752.953.755.557.458.155.854.551.350.953.6
199748.547.949.551.457.857.859.561.462.255.153.447.754.4
199852.050.150.250.453.956.758.558.857.455.051.744.653.3
199947.447.346.848.651.355.056.560.154.952.554.746.051.8
200048.351.648.452.355.356.758.759.058.754.348.648.453.4
200146.947.050.249.254.056.057.459.556.254.451.849.252.7
POR=115 YRS47.548.348.850.352.755.156.356.956.554.251.348.352.2

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 EUREKA, CA (EKA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–732172042693283895905423955374393932934596
1973–742873082303933994195595234554544233214771
1974–752222202743604075015874695325474173474883
1975–762442902863284865425695165904904243605125
1976–772262132583243755355374005774684153174645
1977–783022002313424084274034043474153572644100
1978–792742412153075036675624674594123743234804
1979–80208165922313694045113305003863882803864
1980–812303032463284024223843774514233572494172
1981–822992052033243393966164305124193732584374
1982–832041581812323814684153173553913202033625
1983–84133901292153364434754293694033012853608
1984–852221421952953785565074725323963382434276
1985–861951942443165465333293373654223381693988
1986–872272362272903414174873723773162602133763
1987–881631962262213024704464234533582652153738
1988–891872182742973455295825354033092782144171
1989–901641712433063654825135414533563321984124
1990–91154141953254516805283365164183873304361
1991–922291642252744015114503163292502481933590
1992–931351762202113935565704333543372142033802
1993–942291522682534464724424554263572862334019
1994–952411021553215765593833684454123412634166
1995–961421961333083253944723604353523442783739
1996–972312052683234074315014764754012122094139
1997–98163106823003415293974094504323372423788
1998–991921862233053936245414905564854172964708
1999–002541462953823035805113825063782982424277
2000–011911791813264845065555004534673372644443
2001–228168257322389481
COOLING DEGREE DAYS (base 65 F) 2001 EUREKA, CA (EKA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720000000100001
19730000010000001
19740000000000000
19750000000000000
19760000000000000
19770000000000000
19780000000001001
1979000000001500217
19800200000003005
19814000000000004
19820000030002005
19830000000270009
19840000000041005
19850000001002003
19860000000005005
19870000300005008
19880000000040004
19890001000000001
19900000000400004
1991000000010040014
19920000002032007
199303003000080014
19940000000000000
19950000000000000
19960000000001001
199700104003500013
19980000000000000
19990000000000101
20000000000000000
20010000000300003
SNOWFALL (inches) 2001 EUREKA, CA (EKA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972–730.00.00.00.00.01.90.00.0T0.00.00.01.9
1973–740.00.00.00.00.00.0T0.00.00.00.00.0T
1974–750.00.00.00.00.0T0.00.00.0T0.00.0T
1975–760.00.00.00.00.00.00.00.00.10.00.00.00.1
1976–770.00.00.00.00.00.00.00.0T0.00.00.0T
1977–780.00.00.00.00.10.00.00.00.00.00.00.00.1
1978–790.00.00.00.00.00.00.00.00.00.00.00.00.0
1979–800.00.00.00.00.00.00.00.00.00.00.00.00.0
1980–810.00.00.00.00.00.00.00.00.00.00.00.00.0
1981–820.00.00.00.00.00.0T0.0TT0.00.0T
1982–830.00.00.00.00.0T0.00.0T0.00.00.0T
1983–840.00.00.00.0T1.00.00.00.00.00.00.01.0
1984–850.00.00.00.00.00.00.00.00.00.00.00.00.0
1985–860.00.00.00.00.00.00.00.00.00.00.00.00.0
1986–870.00.00.00.00.00.00.00.00.00.00.00.00.0
1987–880.00.00.00.00.0T0.00.00.00.00.00.0T
1988–890.00.00.00.00.0T0.03.50.00.00.00.03.5
1989–900.00.00.00.00.00.00.01.00.00.00.00.01.0
1990–910.00.00.00.00.0T0.00.0T0.00.00.0T
1991–920.00.00.00.00.0T0.00.00.00.00.00.0T
1992–930.00.00.00.00.0T0.0T0.0T0.00.0T
1993–940.00.00.00.00.00.00.0TT0.00.00.0T
1994–950.00.00.00.0T0.00.00.0TT0.00.0T
1995–960.00.00.00.00.00.0TTT0.00.00.0T
1996–970.00.00.00.00.0TT0.0T0.00.00.0T
1997–980.00.00.00.00.00.0TT0.00.00.00.0T
1998–990.00.00.00.00.0TTT0.6T0.00.00.6
1999–000.00.00.00.00.0TT0.00.00.00.00.0T
2000–010.00.00.00.00.00.00.00.0T0.00.00.0T
2001–0.00.00.00.00.0T
POR=90 YRS0.00.00.00.00.00.00.10.1TT0.00.00.2

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