Monday, October 1, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 1, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

AFTERNOON RAIN AND FOG ATOP GREAT BLUE HILL….

Rain started around noontime today, leaving .03 inches
in the gauge by the 1 P.M. observation. Fog has brought
visibility down to a half mile. A wind shift from W-NE
was observed shortly before the rain. The maximum
temperature so far today is 65F, a degree below the
normal of 66F. The low since midnight is 55F, 6 degrees
above the daily normal minimum of 49F.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus
Temperature: 60F; Dew Point: 57F; Wind: SSW at 10G15 kts
Sea-level pressure: 30.31 ins. Hg, rising, then more rapidly
Visibility: 40 miles
6-hr Max temp: 60F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
BHO SA 1155 E120 BKN 40 264/60/57/2010G15/031/ 8/070 53007
10060 20055

10 A.M.
Weather: Overcast stratus
Temperature: 65F; Dew Point: 60F; Wind: W at 8G14 kts
Sea-level pressure: 30.32 ins. Hg, rising steadily
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E20 OVC 40 268/65/60/2708G12/032/ 8/6// 51004

1 P.M.
Weather: Fog, light rain becoming drizzle
Temperature: 57F; Dew Point: 57F; Wind: NE at 8G14 kts
Sea-level pressure: 30.31 ins. Hg, falling, then more slowly
Visibility: 1/2 mile, fog
6-hr Max temp: 65F
6-hr Min temp: 56F
6-hr Precip: 0.03 ins.
BHO SA 1755 W3 X 1/2L-F 264/57/57/0408G14/031/ R- BCMG LUNK/
8//// 60003 58004 10065 20056

SUMMARY FOR SUNDAY, SEPTEMBER 30, 2018

TEMPERATURE (DEGREES F)
MAX…..68   NORMAL…..66
MIN…..48   NORMAL…..49
MEAN….58   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL……………………0
TOTAL DEPARTURE FOR THE MONTH………………….+78 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE MONTH…………..87   DEPARTURE……..-30
TOTAL HEATING UNITS FOR THE SEASON………….87   DEPARTURE……..-55
TOTAL HEATING UNITS LAST SEASON TO DATE……..78   DIFFERENCE……..-6

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….110  DEPARTURE………+50
TOTAL COOLING UNITS FOR THE SEASON…………863  DEPARTURE……..+266
TOTAL COOLING UNITS LAST SEASON TO DATE…….707  DIFFERENCE…….+156

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 W   AT 1:18  P.M.
AERO…………………….16 W   AT 1:28  P.M.
ASOS…………………….19 W   AT 1:18  P.M.
DAVIS……………………19 W   AT 1:18  P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….12 NW  AT 6:21  A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 W   AT 12:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 W   AT 12:52 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.1 W
ASOS……………………8.6
DAVIS…………………..8.7 WNW [292 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….9.13  DEPARTURE……+5.07
ASOS…………..9.40
TOTAL PRECIPITATION FOR THE YEAR……….47.08  DEPARTURE……+8.18
ASOS………….48.92

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

9/01 75/58/67/-1/0.00/521/66        17 NE  AERO 15 NE  RMY 16
9/02 83/61/72/+4/0.00/684/87        20 SSW AERO 18 SSW RMY N/A
9/03 92/68/80/+13/0.00/650/83       24 WSW AERO 22 WSW RMY 25
9/04 88/70/79/+12/0.00/695/89       17 W   AERO 16 W   RMY 17
9/05 89/67/78/+11/0.00/638/82       23 SSW AERO 23 SSW RMY 25
9/06 92/70/81/+14/0.56/488/63       29 NNW AERO 29 NNW RMY N/A TSTM
9/07 70/63/67/+1/0.01/000/00        24 NE  AERO 22 NE  RMY N/A
9/08 68/54/61/-5/0.00/031/04        22 NE  AERO 18 NE  RMY 21
9/09 61/53/57/-9/0.00/000/00        23 NE  AERO 21 NE  RMY N/A
9/10 62/56/59/-6/…./000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/…./000/00        23 E   AERO 21 E   RMY N/A TSTM
9/12 69/63/66/+1/…./000/00        21 ENE AERO 21 ENE RMY 21  TSTM
9/13 68/62/65/+1/…./091/12        21 NE  AERO 21 NE  RMY N/A TSTM
9/14 75/61/68/+4/…./233/31        13 NE  AERO 12 ENE RMY 12
9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13
9/16 84/61/73/+10/…./695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/…./372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/…./000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/…./007/01         28 NE  AERO 25 NE  RMY 26
9/20 63/55/59/-3/…./…/..        22 NE  AERO 21 NE  RMY 19
9/21 70/55/63/+2/…./…/..        37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/…./…/..         37 SW  AERO 36 SW  RMY 30
9/23 60/47/54/-6/…./…/..        14 N   AERO 13 N   RMY N/A
9/24 55/50/53/-7/…./…/..        37 ENE AERO 35 ENE RMY 35
9/25 68/51/60/0/…./…/..         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/…./…/..       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/…./…/..        26 NNE AERO 25 NNE RMY 28
9/28 56/52/54/-4/…./…/..        24 NNE AERO 21 NNE RMY 23
9/29 71/50/61/+3/…./…/..        20 NW  AERO 18 NW  RMY 20
9/30 68/48/58/0/…./…/..         20 W   AERO 16 W   RMY N/A

10/1 Low temp since midnight is 48F; normal low is now 49F

DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
TIES PREVIOUS RECORD OF 92F SET IN 1900

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 1.63 INCHES IN 2014
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: Benjamin Turner