2001 Jackson, Mississippi (JAN)

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2001 JACKSON, MISSISSIPPI (JAN)

Jackson is located on the west bank of the Pearl River, about 45 miles east of the Mississippi River and 150 miles north of the Gulf of Mexico. The nearby terrain is gently rolling with no topographic features that appreciably influence the weather. The National Weather Service Office is nearly 7 miles east–northeast of the Jackson Post Office and over 5 miles southwest of the Ross Barnett Reservoir. Alluvial plains up to 3 miles wide extend along the river near Jackson, where some levees have been built on both sides of the river.

The climate is significantly humid during most of the year, with relatively short mild winters and long warm summers. The Gulf of Mexico has a moderating effect on the climate. Cold spells are fairly frequent in winter, but are usually of short duration. Sub–zero temperatures rarely occur. Temperatures occasionally exceed 80 degrees in mid–winter. In summer, temperatures reach 90 degrees or higher on about two–thirds of the days, 100 degree readings are infrequent. Extended periods of very hot weather are rare. On unusual occasions, temperatures at night may drop into the 50s, even in July or August.

Snowfall averages less than two inches per season, with nearly two–thirds of the seasons having only a trace of snow or none at all. Ice storms occasionally cause major damage to trees and power lines during the winter or early spring season. Rainfall is abundant and fairly well–distributed throughout the year. The area does not have a true dry season. However, the six–month period, June through November, is relatively dry in comparison with the December through May period when 60 percent of the annual precipitation can be expected.

Excessive rainfall may occur in any season. In spite of the normally abundant rainfall, fairly serious droughts occasionally occur during the summer or fall season. Tropical disturbances, including hurricanes and their remnants, are infrequent. However, those that pass near or visit the Mississippi Coast in the summer or early fall may bring several days of heavy rain to the Jackson area.

Thunderstorms can be expected on an average of 65 days a year, usually occurring in each month. They are most frequent in summer when they occur on about one-third of the days. At other times of the year, thunderstorms are usually associated with passing weather systems and are likely to be attended by higher winds than in summer. Severe thunderstorms normally affect portions of the metropolitan area a few times each year.

NORMALS, MEANS, AND EXTREMES

JACKSON, MS (JAN)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 03940

32 19′ 11″ N  90 04′ 39″ W  GRND: 293  BARO: 296  CENTRAL (UTC + 6)  

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3055.660.169.377.484.090.692.492.088.079.169.259.576.4
MEAN DAILY MAXIMUM3756.060.768.576.983.790.392.291.787.077.768.059.576.0
HIGHEST DAILY MAXIMUM378285899499105106107104958884107
YEAR OF OCCURRENCE197219891982198719641988198020002000199819711978AUG 2000
MEAN OF EXTREME MAXS.3874.278.283.687.291.996.197.997.494.789.082.576.887.5
NORMAL DAILY MINIMUM3032.735.744.151.960.067.170.569.763.750.342.336.152.0
MEAN DAILY MINIMUM3734.837.444.552.560.868.071.470.264.851.643.437.553.1
LOWEST DAILY MINIMUM3721015273847515535261742
YEAR OF OCCURRENCE198519961980198719711984196719921967199319761989JAN 1985
MEAN OF EXTREME MINS.3816.519.826.535.146.255.764.062.049.434.826.119.738.0
NORMAL DRY BULB3044.147.956.764.672.078.881.580.975.964.755.847.864.2
MEAN DRY BULB3845.349.056.664.672.279.081.881.175.864.855.748.264.5
MEAN WET BULB3541.544.250.958.665.571.574.373.469.058.551.244.258.6
MEAN DEW POINT3536.939.145.753.861.968.371.670.765.954.447.140.054.6
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.34.818.723.922.812.11.30.00.083.9
MAXIMUM 32300.90.30.00.00.00.00.00.00.00.0*0.41.6
MINIMUM 323015.311.34.20.40.00.00.00.00.00.55.712.650.0
MINIMUM 0300.00.00.00.00.00.00.00.00.00.00.00.00.0
H/CNORMAL HEATING DEG. DAYS3065648528587700061042955422467
NORMAL COOLING DEG. DAYS30862875224414512493333941992215
RHNORMAL (PERCENT)3076737172747477777775767675
HOUR 00 LST3084828284878890909088878486
HOUR 06 LST3087878890929294949493908791
HOUR 12 LST3064605654565559585853576258
HOUR 18 LST3070635857606066667071737466
SPERCENT POSSIBLE SUNSHINE3149556166637164656367574761
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)373.32.01.71.51.10.71.31.51.52.22.43.322.5
THUNDERSTORMS372.32.75.85.67.08.912.610.25.12.22.52.367.2
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)16.45.64.84.04.03.65.63.22.45.25.66.44.7
MIDNIGHT-MIDNIGHT (OKTAS)16.45.64.84.04.03.23.62.82.45.65.66.44.5
MEAN NO. DAYS WITH:
CLEAR28.512.510.012.016.014.59.09.05.06.05.03.0110.5
PARTLY CLOUDY23.53.54.06.08.012.04.07.01.03.07.0
CLOUDY215.013.010.05.011.59.014.05.01.012.07.05.0107.5
PRMEAN STATION PRESSURE(IN)2829.8029.7629.6829.6629.6329.6429.6829.6829.6829.7429.7629.8029.71
MEAN SEA-LEVEL PRES. (IN)3430.1630.1230.0430.0129.9829.9930.0230.0230.0230.0830.1130.1530.06
WINDSMEAN SPEED (MPH)307.98.18.47.86.76.05.25.16.06.06.97.66.8
PREVAIL. DIR (TENS OF DEGS)3115341616151515141414151515
MAXIMUM 2-MINUTE:
SPEED (MPH)832433743283944335526294155
DIR. (TENS OF DEGS)34131412103402040635261506
YEAR OF OCCURRENCE199619981999199720011994199820001998200120001994SEP 1998
MAXIMUM 5-SECOND:
SPEED (MPH)840514754394753456334394663
DIR. (TENS OF DEGS)34143329263302010626271506
YEAR OF OCCURRENCE199619982000199619971994199819991998199620001994SEP 1998
PRECIPITATIONNORMAL (IN)305.244.705.825.575.053.184.513.773.553.264.815.9155.37
MAXIMUM MONTHLY (IN)3714.1010.2815.1315.9510.828.4513.258.339.619.139.9817.7017.70
YEAR OF OCCURRENCE197919871976199119671997197919921965197019771982DEC 1982
MINIMUM MONTHLY (IN)370.751.292.051.210.290.101.040.260.560.000.510.910.00
YEAR OF OCCURRENCE198620001966198719881988198720001969196319851980OCT 1963
MAXIMUM IN 24 HOURS (IN)375.633.464.698.423.436.495.494.795.866.994.346.718.42
YEAR OF OCCURRENCE197919741991197919891997200119921965197519831982APR 1979
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013010.89.310.18.39.48.210.39.58.35.98.110.1108.3
PRECIPITATION 1.00301.71.42.01.91.90.91.01.00.90.91.62.117.3
SNOWFALLNORMAL (IN)300.60.20.20.*0.00.00.00.00.00.00.*0.11.1
MAXIMUM MONTHLY (IN)376.33.65.31.10.00.00.0T0.00.00.24.86.3
YEAR OF OCCURRENCE1982196819681987200119761997JAN 1982
MAXIMUM IN 24 HOURS (IN)376.03.65.31.10.00.00.0T0.00.00.24.86.0
YEAR OF OCCURRENCE1982196819681987200119761997JAN 1982
MAXIMUM SNOW DEPTH (IN)366121000000T56
YEAR OF OCCURRENCE198219851968198719761997JAN 1982
NORMAL NO. DAYS WITH:
SNOWFALL 1.0300.20.10.*0.00.00.00.00.00.00.00.00.10.4
PRECIPITATION (inches) 2001 JACKSON, MS (JAN)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720.560.412.133.982.182.713.432.902.692.293.001.4727.75
19732.051.359.082.915.652.848.711.6010.325.802.362.5955.26
19741.051.121.182.9410.072.161.134.981.137.221.621.5236.12
19752.141.591.496.613.452.460.254.856.100.352.752.0334.07
19760.530.662.533.305.495.080.770.761.412.840.210.1023.68
19771.150.572.592.355.436.182.747.9911.347.671.360.3749.74
19780.391.321.775.364.982.645.492.664.040.333.931.0533.96
19792.350.782.962.353.005.374.683.661.163.561.830.0531.75
19801.601.443.641.023.062.521.994.891.634.130.455.4231.79
19810.490.311.431.949.467.448.432.432.714.142.840.4542.07
19822.661.132.941.559.816.042.739.581.583.042.213.9447.21
19830.580.572.935.526.035.030.260.861.893.853.941.4232.88
19840.141.964.526.822.264.143.910.753.426.041.243.5738.77
19850.942.692.051.757.003.565.826.989.237.513.951.2452.72
19860.021.251.342.124.762.488.363.1610.403.171.181.2039.44
19870.772.262.852.244.744.583.004.643.661.321.882.0533.99
19881.400.721.432.152.141.801.211.878.480.211.960.8524.22
19890.980.592.131.504.563.444.767.388.872.88T0.5537.64
19901.202.113.902.477.366.274.405.041.282.463.011.1140.61
19911.370.202.364.993.693.061.721.352.123.712.052.0828.70
19921.212.013.794.921.053.8415.472.375.691.385.123.7850.63
19931.961.282.215.597.305.6710.903.987.631.752.071.1251.46
19940.631.470.336.981.292.452.793.542.651.273.181.7628.34
19951.421.351.122.1212.753.364.644.001.850.501.180.4034.69
19961.120.351.281.8010.297.514.832.973.443.673.150.0340.44
19970.692.941.164.134.632.903.532.493.342.981.952.3333.07
19980.971.103.442.151.759.224.973.618.698.154.291.1949.53
19992.301.711.498.435.628.670.511.565.320.671.632.1840.09
20000.462.212.930.664.557.556.020.503.133.552.590.8134.96
20012.083.253.884.034.8111.866.265.487.982.560.560.7553.50
POR=111 YRS1.311.452.573.414.854.904.043.854.362.951.931.4137.03
AVERAGE TEMPERATURE (F) 2001 JACKSON, MS (JAN)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197251.551.258.866.471.979.680.482.881.568.052.050.166.2
197344.346.962.162.570.981.383.780.177.668.661.749.365.8
197455.150.162.463.173.874.880.479.372.064.155.650.465.1
197551.852.956.863.574.178.381.280.672.366.256.647.465.1
197644.356.760.065.467.976.780.880.274.859.947.245.063.2
197735.349.359.766.375.581.782.782.078.462.057.147.564.8
197836.539.652.565.471.980.083.482.078.463.660.348.863.5
197938.346.057.464.870.376.780.279.773.864.150.946.262.4
198047.445.554.361.672.880.785.884.782.461.453.246.264.7
198141.848.755.171.069.981.883.682.673.265.458.646.664.9
198247.248.862.163.874.779.582.481.874.165.156.452.965.7
198343.747.453.960.170.776.682.982.774.165.855.141.862.9
198439.949.756.563.971.078.980.679.974.671.253.658.364.8
198538.044.861.365.272.278.880.580.374.068.062.542.764.0
198645.352.657.064.172.980.483.280.579.866.160.146.665.7
198744.451.355.562.275.979.082.082.975.259.956.652.164.8
198841.747.555.864.670.879.882.582.677.961.659.349.364.5
198952.548.258.863.272.078.480.680.874.163.957.140.464.2
199051.056.260.063.771.881.381.582.378.463.758.051.866.6
199146.651.759.368.075.679.982.981.476.067.252.452.066.1
199245.653.757.664.171.177.782.077.875.665.052.750.164.4
199349.949.254.461.071.080.982.582.975.962.352.145.864.0
199441.949.455.866.270.679.478.979.074.066.258.549.764.1
199546.949.558.564.773.576.082.483.575.263.852.147.664.5
199645.249.851.961.575.778.681.378.973.665.255.350.964.0
199746.051.561.559.669.877.182.379.576.765.150.744.963.7
199849.250.055.762.674.482.283.582.780.668.458.751.466.6
199951.953.954.469.371.579.582.084.075.265.055.848.465.9
200048.854.760.461.875.378.783.585.076.565.752.138.565.1
200141.653.552.167.872.377.281.680.574.062.159.852.064.5
POR=93 YRS47.350.657.265.172.579.581.981.476.766.055.749.065.2

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 JACKSON, MS (JAN)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-73004714004666345031351461902378
1973-7400061173486327419165115101747
1974-7500679308465429348293138002066
1975-76002659304543635252201591802097
1976-7700019752861491343519643102927
1977-78000136246538881706377731402971
1978-7900098164519821531262692002484
1979-8000098421580540570337124302673
1980-81000158363575711454312201802611
1981-820016104217568569451199123402251
1982-8300191202864216534873471761202521
1983-840021833157167704402891132902776
1984-8500122735024983256215892202284
1985-8600145414868560636026190802226
1986-8700079183566632378297150002285
1987-8800016127140871650229274402428
1988-890001342084843924952391352002107
1989-900011109265754429261209125902172
1990-9100514522742756636822935202004
1991-92004674044035933232331181802163
1992-9300145364452461437327163502255
1993-940010161401588709437286881302693
1994-9500767211470558430229801402066
1995-96004106389533603460410161402670
1996-970011802984355923811431701602126
1997-98000129420617481414336124012522
1998-990004619744241232032453301797
1999-0000887268509496308165119001960
2000-010077340481371733039265102802
2001-0016149168408
COOLING DEGREE DAYS (base 65 F) 2001 JACKSON, MS (JAN)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197220173012622144548756150616915162613
19731051772104985834773821818152546
197425891642792984874512235734192036
1975261746962904075094872551015972300
1976017527611635749748130047001943
1977033989331508555534409471642535
1978200922354565765364096031242421
197902356919035748246126976421947
19800111128253476652619527521412644
198103122071745145825552671273022473
19822531169331044354453029713035512577
19830013351943545645553001152462160
198405358722142248947031022719492334
198503541052334244864802901537902307
198602118702594695724874461224422510
1987009723444295335603111422152309
1988011467193452552552395344532308
19898305487245406489498293843602230
1990325609222649451554441211324242532
199103591293374565625153411423772588
199201109721338353240332451202016
199301648197485547562340821902287
19940691321964374374392831102442077
199552387928233954558131876942278
19960281264343418512439275921352201
19971394015175368540459357139002115
199820556029852258255447415612292744
19991214018821344153359631996112414
200021728293284175816283571022302512
200101601562383755224872906717102178
SNOWFALL (inches) 2001 JACKSON, MS (JAN)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.00.00.0TT0.00.00.00.0T
1973-740.00.00.00.00.00.30.00.00.00.00.00.00.3
1974-750.00.00.00.0T0.0T0.0T0.00.00.0T
1975-760.00.00.00.0TTT0.00.00.00.00.0T
1976-770.00.00.00.00.20.05.80.00.00.00.00.06.0
1977-780.00.00.00.00.00.01.1T0.10.00.00.01.2
1978-790.00.00.00.00.0TTT0.00.00.00.0T
1979-800.00.00.00.00.00.0TTT0.00.00.0T
1980-810.00.00.00.00.0TTT0.00.00.00.0T
1981-820.00.00.00.00.0T6.3TT0.00.00.06.3
1982-830.00.00.00.00.00.0TT0.0T0.00.0T
1983-840.00.00.00.00.0TTT0.00.00.00.0T
1984-850.00.00.00.00.0T0.31.40.00.00.00.01.7
1985-860.00.00.00.00.0T0.0T0.00.00.00.0T
1986-870.00.00.00.00.00.0T0.0T1.10.00.01.1
1987-880.00.00.00.00.00.0TT0.00.00.00.0T
1988-890.00.00.00.00.0T0.0TTT0.00.0T
1989-900.00.00.00.0T0.10.00.00.00.00.00.00.1
1990-910.00.00.00.00.0T0.00.00.0T0.00.0T
1991-920.00.00.00.0T0.00.20.00.00.00.00.00.2
1992-930.00.00.00.0T0.0T0.01.60.00.00.01.6
1993-940.00.00.00.00.0T0.00.00.00.00.00.0T
1994-950.00.00.00.00.00.00.00.00.00.00.00.00.0
1995-960.00.00.00.00.0TTT0.00.00.0
1996-970.00.00.00.00.00.7TT0.00.00.00.00.7
1997-980.00.00.00.00.04.80.00.00.00.00.00.04.8
1998-990.00.00.00.00.0TT0.0T0.00.00.0T
1999-000.00.00.00.00.00.00.40.00.0T0.00.00.4
2000-010.00.00.00.0T1.0T0.00.00.00.00.01.0
2001-0.0T0.00.00.00.0
POR=38 YRS0.00.00.00.0T0.10.50.20.2T0.00.01.0

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