Wednesday, October 1, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 1, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

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

On the last day of September 0.12 inches of new rain fell
prior to midnight completing the month with 0.41 inches
of precipitation, estalishing a new record as the driest
September since records began in 1885. The old record of
0.45 inches was set 100 years ago in 1914. September of
2014 also ranks as the 8th driest of any month since records
began.

BHO Driest Septembers, inches (1885-2014)

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 (1885-2014)

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

Steadier rain began at the station since mid morning,
with 0.87 inches falling at the station between 7:00 AM
and 1:00 PM EST, total 0.90 inches since midnight EST.
Thick fog has also been reducing visibility at times
to 1/16 of a mile with winds from the NNE gusting to
29 MPH just prior to the 1:00 PM EST observation.

SEPTEMBER 2014 PRELIMINARY STATS

TEMPERATURE [deg. F] Av. Max. 74.4 [+2.8] Av. Min. 55.6 [+1.0] Mean     65.0 [+1.9] 24-hour corr. mean: 64.5
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 Departure of -3.65
Greatest one calendar day: 0.17 [on the 13th] Greatest in 24 hours 0.17 [on the 13th] Annual Precipitation as of 9/30 at Midnight: 31.59
Annual Precipitation Departure: -7.49

WIND
Av. wind speed:       9.9  MPH
Av. corr. wind speed: 10.2 MPH
Prevailing direction: WNW @ 11%

SUNSHINE
Total astronomical minutes: N/A at this time
Total Campbell Stokes card minutes: N/A at this time

Today’s Observations:

7 A.M.
Weather: Fog and light drizzle
Temperature: 55F; Dew Point: 55F; Wind: NE at 12G19 kts,
Sea-level pressure: 30.06 ins. Hg, rising, then more slowly
Visibility: 1/16 of a mile, obscured by fog
6-hr max temp: 55F
6-hr min temp: 54F
24-hr precip: 0.15
BHO SA 1155 W2 X 1/16L-F 178/55/55/0412G19/006/
8//// 51009 ASOS 60003 70016 MANUAL 60003 70015 10055 20054

10 A.M.
Weather: Fog and light rain
Temperature: 55F; Dew Point: 55F; Wind: NE at 11G18 kts
Sea-level pressure: 30.09 ins. Hg, rising, then steady
Visibility: 1/8 of a mile, obscured by fog
3-hr precip: 0.19
BHO SA 1455 W3 X 1/8R-F 188/55/55/0411G18/009/
8//// 51010 ASOS 60016 MANUAL 60019

1 P.M.
Weather: Fog and moderate rain
Temperature: 55F; Dew Point: 55F; Wind: NE at 16G25 kts,
Peak Wind: 25 kts NE @ 12:55 PM
Sea-level pressure: 30.06 ins. Hg, steady, then falling
Visibility: 1/8 of a mile, 1/4 mile E-S, obscured by fog
6-hr max temp: 56F
6-hr min temp: 55F
6-hr precip: 0.87
BHO SA 1755 W3 X 1/8RF 178/55/55/0516G25/006/
VSBY E-S 1/4 MI PK WND 0525/55/ 8//// 58010
ASOS 60083 MANUAL 60087 10056 20055

WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 30, 2014

TEMPERATURE (DEGREES F)
MAX…..56    NORMAL…..66
MIN…..54    NORMAL…..49
MEAN….55    NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH……………………+64 [+1.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE………..-1
TOTAL COOLING UNITS FOR THE MONTH………….108  DEPARTURE……….+48
TOTAL COOLING UNITS FOR THE SEASON…………587  DEPARTURE……….-10
TOTAL COOLING UNITS LAST SEASON TO DATE…….696  DIFFERENCE……..-109

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..10  DEPARTURE………..+2
TOTAL HEATING UNITS FOR THE MONTH…………..99  DEPARTURE……….-18
TOTAL HEATING UNITS FOR THE SEASON…………101  DEPARTURE……….-41
TOTAL HEATING UNITS LAST SEASON TO DATE…….146  DIFFERENCE………-45

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………24 NNE AT  6:48 A.M.
ASOS…………………..24 NE  AT  6:48 A.M.
DAVIS………………….22 NNE AT  6:49 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..15 NNE AT  6:48 A.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………..15 NNE AT  1:53 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15 NNE AT  1:54 P.M.
AVERAGE WIND SPEED AND DIRECTION………….8.8 NNE
ASOS………………….9.1
DAVIS…………………7.8 NNE (029 degrees)
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.15  DEPARTURE……….-0.03
ASOS…………..0.16
TOTAL PRECIPITATION FOR THE MONTH……….0.03  DEPARTURE……….N/A
ASOS…………..0.03
TOTAL PRECIPITATION FOR THE YEAR……….31.62  DEPARTURE……….N/A
ASOS………….31.83

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/+4/0.00/654/91              19 NNE RMY 19
9/27 84/58/71/+12/0.00/…/..             17 NNW RMY N/A
9/28 86/63/75/+17/0.00/…/..             17 SW  RMY 18
9/29 75/55/65/+7/0.03/…/..              25 NE  RMY 26
9/30 56/54/55/-3/0.12/000/00              24 NNE RMY N/A

10/1 morning low temp: 54F since midnight; normal low now 49F

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 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.44 INCHES IN 1984
PEAK GUST 68e MPH SSE IN 1977

RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984

TODAY’S REPORT PREPARED BY: Brian Fitzgerald