Tuesday, October 2, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 2, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY CONDITIONS CONTINUE ON GREAT BLUE HILL….

Fog increased between the 7 A.M. and the 10 A.M. observations,
decreasing visibility from a 1/2 mile to a 1/16 mile. A light
drizzle persisted throughout the day, leaving 0.05 inches in
the rain gauge at 1 P.M. We also measured 0.43 inches of rain
this morning at 7 A.M. Wind remained light and from the east.
The maximum temperature so far today is 58F, 7 degrees below the
normal of 65F. The low since midnight is 53F, 7 degrees above the
daily normal minimum of 48F.

Today’s Observations:

7 A.M.
Weather: Fog, drizzle
Temperature: 55F; Dew Point: 55F; Wind: E at 5 kts,
Wind: Light
Sea-level pressure: 30.27 ins. Hg, rising then falling
Visibility: 1/2 mile, fog
6-hr Max temp: 55F
6-hr Min temp: 53F
24-hr Precip: 0.43 ins.
BHO SA 1155 W3 X 1/2LF 250/55/55/0705/027/ WND LGT L CTD/ 8////
70043 50002 10055 20053

10 A.M.
Weather: Fog, drizzle
Temperature: 55F; Dew Point: 55F; Wind: ENE at 6G14 kts,
Wind: Light
Sea-level pressure: 30.25 ins. Hg, falling steadily
Visibility: 1/16 mile, fog
3-hr Precip: 0.03 ins.
BHO SA 1455 W3 X 1/16LF 245/55/55/0606G14/025/ WND LGT L CTD/
8//// 60003 58005

1 P.M.
Weather: Fog, light drizzle
Temperature: 57F; Dew Point: 57F; Wind: E at 5 kts,
Wind: Light
Sea-level pressure: 30.16 ins. Hg, falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 58F
6-hr Min temp: 54F
6-hr Precip: 0.05 ins.
BHO SA 1755 W3 X 1/16L-F 214/57/57/0805/016/ WND LGT L-CTD/ 8////
60005 58031 10058 20054

SUMMARY FOR MONDAY, OCTOBER 1, 2018

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..66
MIN…..53   NORMAL…..49
MEAN….59   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL…………………..+2
TOTAL DEPARTURE FOR THE MONTH……………………2 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH……………6   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE SEASON………….93   DEPARTURE……..-58
TOTAL HEATING UNITS LAST SEASON TO DATE…….104   DIFFERENCE…….-11

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH……………0  DEPARTURE……….-1
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………………..21 ENE AT 1:35  P.M.
AERO…………………….18 SSW AT 7:07  A.M.
ASOS…………………….21 SSW AT 7:07  A.M.
DAVIS……………………21 SSW AT 7:48  A.M. RMY 21
FASTEST MILE FOR YESTERDAY………………….17 SSW AT 7:28  A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….16 SSW AT 7:41  A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 SW  AT 7:28  A.M.
AVERAGE WIND SPEED AND DIRECTION……………9.3 NE
ASOS……………………9.9
DAVIS…………………..9.6 E [77 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.43  DEPARTURE……+0.27
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE MONTH……….0.43  DEPARTURE……+0.27
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE YEAR……….47.51  DEPARTURE……+8.45
ASOS………….49.35

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

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

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1 65/53/59/+2/…./…/..         21 ENE AERO 18 SSW RMY N/A

10/2 Low temp since midnight is 48F; normal low is now 49F

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

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

RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964

TODAY’S REPORT PREPARED BY: Benjamin Turner