Sunday, October 7, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 7, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

A WARM AND CLOUDY DAY ON TOP OF GREAT BLUE HILL….

Overcast conditions persisted through each of our
observations today. Southwest wind is bringing warmer
air into the region, making for higher than normal
temperatures. The high so far is 75F, 12 degrees above our
normal high temperature of 63F. Our low so far since
midnight was 59F, which is 13 degrees higher than our
normal low of 46F. Visibility was reduced to only 40 miles
between 7 A.M. and 1 P.M. due to a lingering haze in the
area.

PRELIMINARY STATS FOR SEPTEMBER 2018

TEMPERATURE, Deg. F
Avg. Max. 72.5 [+0.9] Avg. Min. 58.6 [+4.0] Mean 65.6 [+2.5] 24-hour corrected mean: 64.8
Max. for month: 92F on 3rd, 6th
Min. for month: 47F on 23rd

HEATING DEGREE DAYS
Total heating units: 87 [-30] Total for the season: 87 [-55] Total for last season: 93

COOLING DEGREE DAYS
Total cooling units: 110 [+50] Total for the season: 863 [+266] Total for last season: 707

PRECIPITATION, Inches
Total: 9.13 [+5.07] Greatest in 24 hrs: 3.32 ins. on the 18th-19th

WIND, mph
Avg. uncorrected wind speed: N/A
Avg. corrected wind speed: N/A
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

BHO Wettest Septembers, inches (1886-2018):
1) 12.37 in 1999
2) 11.04 in 1933
3) 10.23 in 1896
4) 10.00 in 1961
5) 9.62 in 1987
6) 9.58 in 1888
7) 9.36 in 1918
8) 9.13 in 2018
9) 8.81 in 1907
10) 8.78 in 1996

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 63F; Dew Point: 62F; Wind: SSW at 7G12 kts
Sea-level pressure: 30.17 ins. Hg, rising, then more quickly
Visibility: 40 miles, haze aloft
6-hr Max temp: 63F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 E10 OVC 40 216/63/62/2007G12/017/ HZ ALF/ 8/600
53010 10063 20059

10 A.M.
Weather: Overcast stratus
Temperature: 69F; Dew Point: 65F; Wind: SW at 8G15 kts
Sea-level pressure: 30.17 ins. Hg, rising then steady
Visibility: 40 miles, haze aloft
3-hr Precip: 0.00 ins.
BHO SA 1455 E13 OVC 40 218/69/65/2308G15/017/ HZ ALF/ 8/600
51002

1 P.M.
Weather: Overcast stratus
Temperature: 74F; Dew Point: 67F; Wind: WSW at 4 kts
Wind: light
Sea-level pressure: 30.18 ins. Hg, rising then falling
Visibility: 40 miles, haze aloft
6-hr Max temp: 75F
6-hr Min temp: 63F
6-hr Precip: 0.00 ins.
BHO SA 1755 E17 OVC 40 220/74/67/2504/018/ HZ ALF/ 8/600
50002 10075 20063

SUMMARY FOR SATURDAY, OCTOBER 6, 2018

TEMPERATURE (DEGREES F)
MAX…..64   NORMAL…..64
MIN…..45   NORMAL…..47
MEAN….55   NORMAL…..55

DEPARTURE FROM 30-YEAR NORMAL……………………0
TOTAL DEPARTURE FOR THE MONTH…………………..11 [+2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..10   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH…………..42   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE SEASON…………129   DEPARTURE……..-69
TOTAL HEATING UNITS LAST SEASON TO DATE…….121   DIFFERENCE………8

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……..+264
TOTAL COOLING UNITS LAST SEASON TO DATE…….712  DIFFERENCE…….+151

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 SSW AT 7:44 P.M.
AERO…………………….23 SSW AT 7:46 P.M.
ASOS…………………….25 S   AT 7:45 P.M.
DAVIS……………………26 SSW AT 7:44 P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….16 SSW AT 7:46 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S   AT 8:51 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 SSW AT 7:30 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.0 SSW
ASOS……………………7.4
DAVIS…………………..7.0 SSW [212 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……….1.32  DEPARTURE……+0.43
ASOS…………..1.34
TOTAL PRECIPITATION FOR THE YEAR……….48.40  DEPARTURE……+8.61
ASOS………….50.26

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 64/53/59/+2/…./…/..         33 S   AERO 32 S   RMY 35 TSTM
10/3 60/52/56/0/…./…/..          18 NNE AERO 14 NNE RMY 14
10/4 69/57/63/+7/…./…/..         29 SSW AERO 29 SSW RMY 32
10/5 64/47/56/0/…./…/..          25 NE  AERO 21 NE  RMY 24
10/6 64/45/55/0/0.00/…/..          23 SSW AERO 23 SSW RMY 25

10/7 Low temp since midnight is 59F; normal low is now 46F

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

RECORDS FOR OCTOBER 7
HIGH 88F IN 1963 (RECORD FOR MONTH)
LOW 30F IN 1904,1986
PRECIP 1.75 INCHES IN 1972
PEAK GUST 54 W IN 2009

RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.31 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996

TODAY’S REPORT PREPARED BY: Samantha Richard