Saturday, October 4, 2014

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 4, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY AND COOL WITH OCCASIONAL DRIZZLE OVERNIGHT
AND THIS MORNING…

A total of 0.07 inch of precipitation has occurred
since Friday evening through early this morning.
Dense fog at sunrise lifted only very slowly during
the morning, and the visibility has climbed to xx miles
as of early afternoon under low clouds.

After a very sunny month of September with 67%
of the possible bright sunshine (August had 70%)
there has been no sunshine this month into early
afternoon today, October 4.

SEPTEMBER OFFICIALLY CAME TO A CLOSE AS THE
DRIEST SEPTEMBER ON RECORD AT BLUE HILL OBSERVATORY,
SURPASSING A 100 YEAR OLD RECORD

BHO Driest Septembers, inches (1886-2014)

1) 0.41 in 2014
2) 0.45 in 1914
3) 0.62 in 1948
4) 0.69 in 1980
5) 0.72 in 1930
6) 0.74 in 1915

BHO Driest Months, inches (1886-2014)

1) 0.06 in March, 1915
2) 0.13 in July, 1952
3) 0.14 in June, 1999
4) 0.22 in October, 1924
5) 0.31 in March, 2006
6) 0.33 in July, 1957
7) 0.39 in October, 1994
8) 0.41 in September, 2014
9) 0.45 in September, 1914
10) 0.50 in May, 1944
0.50 in October, 1946

The mean wind speed for September of 10.5 mph was
the lowest on record for the month.

BHO Lowest September Mean Wind Speed, mph (1885-2014)

1) 10.5 in 2014
2) 10.6 in 2013
3) 10.7 in 2011
4) 10.9 in 1917
10.9 in 2003

SEPTEMBER 2014 PRELIMINARY STATS
[Departures are relative to the 1981-2010 normal]

TEMPERATURE [deg. F]

Av. Max. 74.4 [+2.8] Av. Min. 55.6 [+1.0] Mean     65.0 [+1.9] 24-hour corr. mean: 64.4   [corrected] Max. temp. for month: 91 on 2nd
Min, temp. for month: 43 on 19th
Total heating degree day units: 99 [-18] Total seasonal heating   units: 101 [-41] Total cooling degree day units: 108 [+48] Total seasonal cooling   units: 587 [-10]

PRECIPITATION [ins.]

Total: 0.41 [-3.65] Greatest one calendar day: 0.17 [on the 13th] Greatest in 24 hours 0.17 [on the 13th]

WIND
Av. wind speed:       9.9  MPH
Av. corr. wind speed: 10.5 MPH  [corrected] Prevailing direction: WNW @ 11%

SUNSHINE
Total astronomical minutes: 14988/22440 or 67%
Total Campbell Stokes card minutes: 14400/21582 or 67%

Today’s Observations:

7 A.M.
Weather: Sky obscured in light drizzle dense fog
Temperature: 54F; Dew Point: 54F; Wind: Calm
Sea-level pressure: 29.83 ins. Hg, falling
Visibility: 1/4 mile
6-hr max temp: 54F
6-hr min temp: 52F
6-hr precip: 0.02 in.
24-hr precip: 0.07 in.
BHO SA 1155 W4 X 1/4L-F 100/54/54/0000/983/ 8//// 56010 6002/
70007 10054 20052

10 A.M.
Weather: Sky partly obscured in fog and light drizzle,
drizzle began past hour
Temperature: 56F; Dew Point: 56F; Wind: ENE at 10 kts,
Sea-level pressure: 29.75 ins. Hg, falling
Visibility: 2 miles, variable 1/2 to 3 miles
3-hr precip: Trace
BHO SA 1455 -X E5 OVC 2VL-F 074/56/56/1010/975/ F4 VSBY 1/2V3
L-B UKN/ 8/6// 58026 6000/

1 P.M.
Weather: Scattered stratocumulus, overcast stratus, sun
occasionally dimly visible
Temperature: 60F; Dew Point: 57F; Wind: ESE at 10G18 kts
Sea-level pressure: 29.67 ins. Hg, falling
Visibility: 30 miles, except 35 miles SE-S
6-hr max temp: 60F
6-hr min temp: 54F
6-hr precip: Trace
BHO SA 1755 5 SCT E7 OVC 30 049/60/57/1210G18/967/ VSBY
SE-S 35 SUN OCNLY DMLY VSBL/ 8/6// 58025 6000/ 10060 20054

WEATHER SUMMARY FOR FRIDAY, OCTOBER 3, 2014

TEMPERATURE (DEGREES F)
MAX…..54    NORMAL…..65
MIN…..46    NORMAL…..48
MEAN….50    NORMAL…..56

DEPARTURE FROM 30-YEAR NORMAL…………………….-6
TOTAL DEPARTURE FOR THE MONTH……………………-13 [-4.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE…………0
TOTAL COOLING UNITS FOR THE MONTH……………0  DEPARTURE………..-1
TOTAL COOLING UNITS FOR THE SEASON…………587  DEPARTURE……….-11
TOTAL COOLING UNITS LAST SEASON TO DATE…….700  DIFFERENCE……..-113

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15  DEPARTURE………..+6
TOTAL HEATING UNITS FOR THE MONTH…………..38  DEPARTURE……….+12
TOTAL HEATING UNITS FOR THE SEASON…………139  DEPARTURE……….-30
TOTAL HEATING UNITS LAST SEASON TO DATE…….148  DIFFERENCE……….-9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………20 NE  AT 12:40 P.M. *
ASOS…………………..21 NE  AT 12:09 P.M.
DAVIS………………….19 NNE AT 12:09 P.M. RMY 20
FASTEST MILE FOR YESTERDAY………………..14 N   AT 12:38 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15 N   AT 12:52 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….14 N   AT 12:53 A.M.
AVERAGE WIND SPEED AND DIRECTION………….9.1 N
ASOS………………….8.5
DAVIS…………………7.8 NNE (016 degrees)
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.07  DEPARTURE……..-0.07
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….1.99  DEPARTURE……..+1.54
ASOS…………..2.01
TOTAL PRECIPITATION FOR THE YEAR……….33.58  DEPARTURE……..-5.95
ASOS………….33.81

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

9/1  88/69/79/+11/0.00/710/90             16 W   RMY 19
9/2  91/70/81/+13/0.00/495/63             24 S   RMY 27 TSTM
9/3  83/67/75/+8/0.00/681/87              24 NW  RMY 27
9/4  86/61/74/+7/0.00/758/97              20 SW  RMY 22
9/5  89/66/78/+11/0.00/731/94             25 SSW RMY 29
9/6  90/67/79/+12/T/481/62                33 SSW RMY 36 TSTM
9/7  77/62/70/+4/0.03/687/89              26 NW  RMY N/A
9/8  74/57/66/+0/0.00/601/78              25 ENE RMY 25
9/9  71/59/65/-1/0.00/384/50              23 ENE RMY 23
9/10 71/58/65/0/0.00/329/43               20 NE  RMY 20
9/11 78/60/69/+4/0.00/099/13              31 SW  RMY 35
9/12 72/51/62/-3/0.00/735/97              25 NNW RMY 22
9/13 67/50/59/-5/0.17/159/21              23 E   RMY 24
9/14 66/47/57/-7/0.00/685/91              25 NW  RMY 24
9/15 67/43/55/-9/0.00/698/93              17 W   RMY 18
9/16 66/52/59/-4/T/030/04                 16 SW  RMY 16
9/17 72/50/61/-2/0.00/722/98              16 NW  RMY 17
9/18 74/52/63/+1/0.00/578/78              21 N   RMY 23
9/19 56/43/50/-12/0.00/702/95             21 NE  RMY 23
9/20 71/45/58/-4/T/515/70                 29 S   RMY 30
9/21 80/61/71/+10/0.06/176/24             26 SSE RMY 27
9/22 72/48/60/-1/0.00/701/96              33 W   RMY 35
9/23 70/44/57/-3/0.00/712/98              20 W   RMY 20
9/24 69/52/61/+1/0.00/543/75              21 NE  RMY 21
9/25 59/52/56/-4/0.00/000/00              20 NE  RMY 19
9/26 73/52/63/+4/0.00/661/92              19 NNE RMY 19
9/27 84/58/71/+12/0.00/695/97             17 NNW RMY N/A
9/28 86/63/75/+17/0.00/635/89             17 SW  RMY 18
9/29 75/55/65/+7/0.03/085/12              25 NE  RMY 26
9/30 56/54/55/-3/0.12/000/00              24 NNE RMY N/A

10/1 56/55/56/-1/…./000/00              33 NE  RMY 36
10/2 55/47/51/-6/…./000/00              30 NE  RMY N/A
10/3 54/46/50/-6/…./000/00              20 NE  RMY 20

10/4 morning low temp: 52F since midnight; normal low now 47F

DAILY RECORDS FOR SEPTEMBER 2014:
9/27 – Maximum temperature of 84F;
equaled record high maximum set in 1998
9/28 – Maximum temperature of 86F;
surpassed record high maximum of 82F set in 1959

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR OCTOBER 4
HIGH 84F IN 2007
LOW 28F IN 1888
PRECIP 1.87 INCHES IN 2011
PEAK GUST 59 MPH SSW IN 1990

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

TODAY’S REPORT PREPARED BY: Mike Iacono