2001 Nashville, Tennessee (BNA)

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2001 NASHVILLE, TENNESSEE (BNA)

The city of Nashville is located on the Cumberland River, in the northwestern corner of the Central Basin of middle Tennessee near the escarpment of the Highland Rim. The Rim, as it is called, rises to the height of 300 to 400 feet above the mean elevation of the basin, forming an amphitheater about the city from the southwest to the southeast, with the south being more or less open but undulating.

Temperatures are moderate, with great extremes of either heat or cold rarely occurring, yet there are changes of sufficient amplitude and frequency to give variety.

Based on the 1951–1980 period, the average first occurrence of 32 degrees Fahrenheit in the fall is October 29 and the average last occurrence in the spring is April 5.

Humidity is an important phase of climate in relation to bodily health and comfort. The Nashville records show that the average relative humidity is moderate as compared with the general conditions east of the Mississippi River and south of the Ohio.

Nashville is not in the most frequented path of general storms that cross the country, however, it is in the zone of moderate frequency of thunderstorms. The thunderstorm season usually begins in the latter part of March and continues through September.

NORMALS, MEANS, AND EXTREMES

NASHVILLE, TN (BNA)

LATITUDE:    LONGITUDE:    ELEVATION (FT):    TIME ZONE:    WBAN: 13897

36 07′ 08″ N  86 41′ 21″ W  GRND: 571  BARO: 574  CENTRAL (UTC + 6)

ELEMENTPORJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECYEAR
TEMPERATURE FNORMAL DAILY MAXIMUM3045.950.861.270.878.886.589.588.482.572.560.450.269.8
MEAN DAILY MAXIMUM5446.951.860.370.879.186.589.888.882.872.559.750.369.9
HIGHEST DAILY MAXIMUM627884869197106107104105948479107
YEAR OF OCCURRENCE197219621982198919411952195219541954195320001982JUL 1952
MEAN OF EXTREME MAXS.5468.072.278.885.389.494.997.296.393.685.877.069.184.0
NORMAL DAILY MINIMUM3026.529.939.147.556.664.768.967.761.148.339.630.948.4
MEAN DAILY MINIMUM5428.431.438.747.857.165.269.567.860.948.538.731.548.8
LOWEST DAILY MINIMUM62-17-13223344251473626-1-10-17
YEAR OF OCCURRENCE198519511980198219761966194719461983198719501989JAN 1985
MEAN OF EXTREME MINS.547.611.521.931.242.152.960.058.045.732.420.912.533.1
NORMAL DRY BULB3036.240.450.259.267.775.679.378.171.860.450.040.559.1
MEAN DRY BULB5437.641.749.559.468.175.979.778.471.960.649.241.059.4
MEAN WET BULB1834.738.844.252.361.568.772.070.764.554.343.037.753.5
MEAN DEW POINT1828.932.136.545.256.764.868.367.060.048.837.632.348.2
NORMAL NO. DAYS WITH:
MAXIMUM 90300.00.00.00.11.59.216.613.15.80.10.00.046.4
MAXIMUM 32305.12.30.10.00.00.00.00.00.00.00.22.410.1
MINIMUM 323022.217.19.21.80.00.00.00.00.01.27.717.877.0
MINIMUM 0300.90.20.00.00.00.00.00.00.00.00.00.31.4
H/CNORMAL HEATING DEG. DAYS3089368946919359000211954507603729
NORMAL COOLING DEG. DAYS3000101914331844340622552001616
RHNORMAL (PERCENT)3070686563707073737469707170
HOUR 00 LST3075747172818385858581777679
HOUR 06 LST3080807980868789909086828084
HOUR 12 LST3063605451555557575853596357
HOUR 18 LST3065615552585962626460646761
SPERCENT POSSIBLE SUNSHINE5441475259606563636262504256
W/OMEAN NO. DAYS WITH:
HEAVY FOG(VISBY 1/4 MI)612.41.31.00.61.00.91.11.51.82.11.61.817.1
THUNDERSTORMS611.21.74.05.17.28.29.27.43.51.61.61.051.7
CLOUDINESSMEAN:
SUNRISE-SUNSET (OKTAS)565.75.45.34.94.84.54.44.24.23.94.85.34.8
MIDNIGHT-MIDNIGHT (OKTAS)325.35.15.04.64.64.14.03.84.03.64.75.04.5
MEAN NO. DAYS WITH:
CLEAR556.36.97.58.38.08.08.19.910.512.88.87.1102.2
PARTLY CLOUDY556.15.97.28.510.112.513.212.29.18.06.87.0106.6
CLOUDY5518.515.516.313.213.09.59.78.910.410.214.417.0156.6
PRMEAN STATION PRESSURE(IN)2929.5029.4629.3929.3729.3529.3629.4029.4129.4329.4729.4829.5029.43
MEAN SEA-LEVEL PRES. (IN)1830.1630.1330.0630.0030.0030.0130.0230.0330.0630.1230.1230.1830.07
WINDSMEAN SPEED (MPH)498.99.19.79.07.46.96.56.06.36.78.38.87.8
PREVAIL. DIR (TENS OF DEGS)3318181818181818181818181818
MAXIMUM 2-MINUTE:
SPEED (MPH)538363940333838362831363040
DIR. (TENS OF DEGS)17021725330136330827261825
YEAR OF OCCURRENCE200019981999199819981999200019992000200119972001APR 1998
MAXIMUM 5-SECOND:
SPEED (MPH)561474859474747493345454161
DIR. (TENS OF DEGS)26191623320135361730252326
YEAR OF OCCURRENCE199919971999199820001999200019992001200119972001JAN 1999
PRECIPITATIONNORMAL (IN)303.583.814.854.374.883.573.973.463.462.624.124.6147.30
MAXIMUM MONTHLY (IN)6213.9210.3112.358.4111.0411.957.758.3111.446.139.0413.6313.92
YEAR OF OCCURRENCE195019561975198419831998195019421979195919451978JAN 1950
MINIMUM MONTHLY (IN)620.190.641.180.520.690.450.710.690.28T0.540.98T
YEAR OF OCCURRENCE198619681987198619411988195419681956196319491985OCT 1963
MAXIMUM IN 24 HOURS (IN)624.404.734.663.294.395.244.325.346.683.754.205.126.68
YEAR OF OCCURRENCE194619891975197920001998199219631979197519971978SEP 1979
NORMAL NO. DAYS WITH:
PRECIPITATION 0.013010.310.311.610.810.99.310.48.38.27.210.111.0118.4
PRECIPITATION 1.00300.70.71.11.21.50.91.21.00.70.71.01.512.2
SNOWFALLNORMAL (IN)304.43.51.10.*0.00.00.00.00.0T0.31.711.0
MAXIMUM MONTHLY (IN)5718.818.916.11.10.0T0.0T0.00.49.213.218.9
YEAR OF OCCURRENCE194819791960197119941989199319501963FEB 1979
MAXIMUM IN 24 HOURS (IN)578.18.38.81.10.0T0.0T0.00.49.210.210.2
YEAR OF OCCURRENCE198819791951197119941989199319501963DEC 1963
MAXIMUM SNOW DEPTH (IN)48708700000005770
YEAR OF OCCURRENCE19481979196819661963JAN 1948
NORMAL NO. DAYS WITH:
SNOWFALL 1.0301.21.40.30.*0.00.00.00.00.00.00.*0.53.4
PRECIPITATION (inches) 2001 NASHVILLE, TN (BNA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19725.153.454.343.583.522.546.404.303.714.065.228.1454.41
19733.403.639.887.005.724.807.671.791.563.327.783.2359.78
19749.453.015.253.975.046.802.104.1310.441.476.232.8160.70
19754.675.2212.353.556.522.222.964.695.425.863.004.1260.58
19764.112.285.321.536.194.724.018.055.085.171.301.8149.57
19772.533.275.837.871.654.291.154.655.044.225.964.2550.71
19785.951.574.882.428.031.464.033.811.372.284.0113.6353.44
19797.134.014.927.808.182.794.274.5911.443.975.985.0470.12
19802.591.387.273.676.142.893.531.241.091.172.551.4034.92
19811.603.833.384.783.058.053.493.101.372.823.832.3841.68
19826.504.803.004.364.192.285.473.463.231.913.876.3649.43
19832.562.933.446.8011.043.931.711.360.452.776.987.7551.72
19841.792.385.148.419.684.496.632.420.976.006.202.3856.49
19853.023.302.702.912.651.532.003.912.521.593.810.9830.92
19860.193.592.290.523.362.380.773.382.192.197.433.3131.60
19871.614.871.181.034.412.822.560.731.950.213.405.4630.23
19883.732.022.182.091.860.453.262.392.451.545.493.9531.41
19894.529.365.312.684.617.873.183.676.303.623.941.9757.03
19902.764.733.261.602.802.374.863.122.134.414.2910.7647.09
19912.925.444.253.355.631.252.821.795.473.882.877.2746.94
19922.972.604.500.773.124.315.893.253.451.624.482.8839.84
19932.763.335.503.334.505.313.641.762.902.202.536.6244.38
19944.366.187.565.723.768.084.825.054.203.314.042.6959.77
19955.611.813.873.957.663.691.953.405.005.603.982.3248.84
19963.822.465.153.684.483.685.451.094.893.166.004.7748.63
19974.193.109.642.424.926.663.263.525.752.716.592.1954.95
19983.684.113.136.314.4611.954.632.931.391.591.306.5352.01
19999.282.334.272.294.353.563.193.051.972.042.992.5041.82
20003.523.753.346.237.661.742.251.951.900.266.393.4442.43
20013.218.542.732.425.544.472.774.071.794.615.093.3248.56
POR=131 YRS4.574.135.064.154.163.893.863.283.282.513.674.0146.57
AVERAGE TEMPERATURE (F) 2001 NASHVILLE, TN (BNA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
197241.841.850.260.567.473.077.377.275.760.247.342.859.6
197338.039.756.856.464.276.178.778.176.266.254.740.560.5
197445.441.854.958.670.071.478.077.667.559.450.042.659.8
197543.444.647.358.570.476.078.579.167.962.452.142.860.3
197636.750.555.959.964.073.376.474.466.853.940.936.657.4
197724.540.653.963.071.977.282.279.574.057.050.838.659.4
197827.629.246.961.066.776.280.578.775.557.453.642.458.0
197929.733.450.757.866.373.777.677.070.560.348.641.557.3
198039.735.746.357.367.875.582.881.776.057.848.541.059.2
198135.542.647.564.064.277.579.876.668.160.449.938.358.7
198234.039.552.554.671.073.379.876.169.661.151.448.259.3
198338.842.750.354.564.875.580.583.273.762.449.934.059.2
198432.243.446.158.264.277.476.176.568.666.746.049.658.8
198527.836.553.261.968.475.780.277.270.864.456.934.258.9
198637.244.750.860.868.676.582.476.774.961.049.939.960.3
198736.143.151.857.773.477.580.281.172.254.652.444.160.4
198834.438.749.357.167.377.381.481.972.854.251.142.459.0
198944.939.052.659.365.774.779.178.070.561.051.429.558.8
199045.849.953.658.466.478.280.479.674.760.154.343.762.1
199139.243.952.563.874.278.281.178.372.361.247.244.561.4
199240.045.950.159.665.872.479.974.970.959.449.541.259.1
199341.639.347.156.767.675.983.381.071.058.647.440.359.2
199433.444.050.762.564.178.178.577.169.161.054.545.359.9
199538.640.460.968.574.780.883.370.760.044.039.5
199636.340.644.655.871.575.677.677.569.560.845.744.458.3
199737.345.653.654.463.272.079.876.971.959.845.539.558.3
199844.746.049.457.971.577.679.679.277.163.552.343.161.8
199942.545.845.662.667.676.581.979.471.959.954.043.761.0
200039.246.753.156.769.976.480.379.871.363.848.030.859.7
200135.444.745.363.768.873.479.878.870.258.554.344.959.8
POR=131 YRS38.641.049.659.468.176.278.978.372.160.849.140.959.4

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 NASHVILLE, TN (BNA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-7300101685336828307022612758303544
1973-74008843167536016413202272832981
1974-750048196464685665567547241603419
1975-7600681383986838704173031839403154
1976-77003134971887212506793501292814407
1977-7800325542581311529965561649204456
1978-7900124033869510888774492135703958
1979-800051804877237778485712403803869
1980-81009259487739909621537979603754
1981-820042175445820956707416309803878
1982-8300301944135378066204583227103451
1983-840045121447956100962157822010604103
1984-8500596356447311467943831452563658
1985-860030912649488545614321715503406
1986-87030175447773889608401242603544
1987-880073173766409417564852424323809
1988-890053434086936187213972589003533
1989-90003615840810955904223732456513393
1990-91002119532365479158640280903061
1991-9200421665356287685444562178523443
1992-9300261814617317177135522523243669
1993-9400272275287599745854371349003761
1994-950021144316605814683175420
1995-9600311846247838867026262923204160
1996-97002516057263485153835731910743567
1997-980002275767856225275052091953475
1998-990001113756716865315951251003104
1999-0000181853226547965233642481403124
2000-01003212351810519125656021241773951
2001-0047218315617
COOLING DEGREE DAYS (base 65 F) 2001 NASHVILLE, TN (BNA)
YEARJANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDECANNUAL
19720016211725038538734124601573
197300142561339432412351128801770
1974001639191203410399130302201440
197530355183341424444164621901698
1976012836682573632999210001154
197700117425337154345828113402008
19780015015234448943232413201807
19790011510326439338117544001376
19800001713132256252734444101948
1981001718138346436614542001553
1982003741992564703521778412211612
1983009126932048856831549201832
19840002187382352364173121011501
1985022459137335479386206792901736
19860015217435255137130459001864
1987000312723814795072273701907
19880051712038051553124617001831
198900219312029844640820839801641
1990042651115401485458315521001917
199100225030040350741926857402030
19920006011523347131120815201415
1993001912133657350621533701801
1994030666740042638115226801529
199500601582974965732103410
19960402224032439739516635021585
1997001366122246537421172001424
19980027522739145944737069111997
19990006010035453345322935101765
20002066172346483467227951801822
20010009314626446843720927201646
SNOWFALL (inches) 2001 NASHVILLE, TN (BNA)
YEARJULAUGSEPOCTNOVDECJANFEBMARAPRMAYJUNTOTAL
1972-730.00.00.00.00.10.64.8T0.20.10.00.05.8
1973-740.00.00.00.00.02.4T0.3T0.00.00.02.7
1974-750.00.00.00.0T2.14.2TTT0.00.06.3
1975-760.00.00.00.0TT1.12.3T0.00.00.03.4
1976-770.00.00.00.01.21.818.5T0.0T0.00.021.5
1977-780.00.00.00.0T0.112.99.82.40.00.00.025.2
1978-790.00.00.00.00.0T8.018.90.60.00.00.027.5
1979-800.00.00.00.0TT0.36.63.10.00.00.010.0
1980-810.00.00.00.0TT1.21.7T0.00.00.02.9
1981-820.00.00.00.00.00.24.83.71.00.00.00.09.7
1982-830.00.00.00.00.00.40.30.8T0.00.00.01.5
1983-840.00.00.00.00.00.75.33.7T0.00.00.09.7
1984-850.00.00.00.00.00.89.88.00.00.00.00.018.6
1985-860.00.00.00.00.00.50.42.1T0.00.00.03.0
1986-870.00.00.00.00.0T1.41.31.6T0.00.04.3
1987-880.00.00.00.0TT8.61.4T0.00.00.010.0
1988-890.00.00.00.00.01.6T5.20.00.00.00.06.8
1989-900.0T0.0TT0.4TT0.40.00.00.00.8
1990-910.00.00.00.00.00.3T0.61.10.00.00.02.0
1991-920.00.00.00.0T0.0T0.01.00.00.00.01.0
1992-930.00.00.00.0T0.3T5.92.8T0.0T9.0
1993-940.00.00.00.4T0.32.31.0TT0.0T4.0
1994-950.00.00.00.00.00.01.51.30.10.00.00.02.9
1995-960.00.00.00.0T0.46.27.89.30.00.0
1996-970.2
1997-98
1998-991.0
1999-00
2000-01
2001-
POR=54 YRS0.0T0.00.00.41.43.72.91.50.00.0T9.9

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