Tuesday, September 30, 2014
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 30, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME
LIGHT RAIN, DRIZZLE AND FOG MAKE A RETURN
TO GREAT BLUE HILL, 0.03 INCHES OVERNIGHT
0.03 inches of light rain and drizzle fell overnight
through the 7:00 AM EST observation, adding our to our
significantly low monthly total. Blue Hill now stands
at 0.33 inches for the month with 0.07 inches falling
through the 1:00 PM EST observation since last night.
Stay tuned to tomorrow’s discussion to see where the
month may finish with precipitation. Anything below a
total of 0.45, the current September record set in 1914,
would set a new record for the driest September on record
here on Great Blue Hill dating over our 129 year
climate record.
Today’s Observations:
7 A.M.
Weather: Fog and light drizzle
Temperature: 54F; Dew Point: 54F; Wind: NE at 11G20 kts,
Sea-level pressure: 30.05 ins. Hg, rising unsteadily
Visibility: 1/8 of a mile, obscured by fog
6-hr max temp: 55F
6-hr min temp: 54F
24-hr precip: 0.03
BHO SA 1155 W3 X 1/8L-F 175/54/54/0511G20/005/
8//// 52008 ASOS 70002 MANUAL 70003 10055 20054
10 A.M.
Weather: Light rain shower, fog
Temperature: 55F; Dew Point: 54F; Wind: estimated NE at 6 kts
Wind Speed: Light
Sea-level pressure: 30.05 ins. Hg, rising slightly
Visibility: 1/8 of a mile, obscured by fog
3-hr precip: 0.01
BHO SA 1455 W3 X 1/8RW-F 177/55/54/0506/005/ WND LGT/
8//// 50002 ASOS 60001 MANUAL 60001
1 P.M.
Weather: Light rain shower, fog
Temperature: 55F; Dew Point: 54F; Wind: NE at 9 kts,
Sea-level pressure: 30.03 ins. Hg, steady then falling
Visibility: 2 miles, 1/2 mile W-NE, obscured by fog
6-hr max temp: 55F
6-hr min temp: 54F
6-hr precip: 0.04
BHO SA 1755 W3 -X 2RW-F 169/55/54/0409/003/ VSBY W-NE 1/2 MI/
8//// 58008 ASOS 60004 MANUAL 60004 10055 20054
WEATHER SUMMARY FOR MONDAY, SEPTEMBER 29, 2014
TEMPERATURE (DEGREES F)
MAX…..75 NORMAL…..67
MIN…..55 NORMAL…..49
MEAN….65 NORMAL…..58
DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+67 [+2.1 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……….+49
TOTAL COOLING UNITS FOR THE SEASON…………587 DEPARTURE………..-9
TOTAL COOLING UNITS LAST SEASON TO DATE…….696 DIFFERENCE……..-109
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………..-8
TOTAL HEATING UNITS FOR THE MONTH…………..89 DEPARTURE……….-20
TOTAL HEATING UNITS FOR THE SEASON………….91 DEPARTURE……….-43
TOTAL HEATING UNITS LAST SEASON TO DATE…….139 DIFFERENCE………-48
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………25 NE AT 7:47 P.M.
ASOS…………………..26 NE AT 7:47 P.M.
DAVIS………………….24 NE AT 5:05 P.M. RMY 26
FASTEST MILE FOR YESTERDAY………………..17 NE AT 6:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 NE AT 6:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….15 NE AT 6:39 P.M.
AVERAGE WIND SPEED AND DIRECTION………….9.3 SW
ASOS………………….9.1
DAVIS…………………8.1 N (6 degrees)
* last of several occurrences
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03 DEPARTURE……….-0.12
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….0.29 DEPARTURE……….-3.62
ASOS…………..0.25
TOTAL PRECIPITATION FOR THE YEAR……….31.47 DEPARTURE……….-7.46
ASOS………….31.68
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/…./…/.. 25 NE RMY 26
9/30 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 SEPTEMBER 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 1.93 INCHES IN 1946
PEAK GUST 58 MPH SSE IN 1999
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
TODAY’S REPORT PREPARED BY: Brian Fitzgerald
