Friday, October 27, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 27, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
AS PRESSURE RISES DRY & CLEAR CONDITIONS RETURN
Pleasant conditions return to Great Blue Hill.
We had a dry and clear day with visibility at
80 miles during each weather observation. The
humidity dropped throughout the day from 78%
at 7:00 AM EST down to 45% by 1:00 PM EST.
We had a wind shift from WSW to W and WNW then
back to WSW. The westerly winds made temperatures
more seasonable with a high of 59F, normal being
56F. Winds have been light to moderate with gust
up to 20 kts (23 MPH). This October so far is the
3rd warmest in Observatory history for average
maximum temperatures and warmest in Observatory
history for average minimum temperatures.
Today’s Observations:
7 A.M.
Weather: Clear, few cumulus distant SSE-S
Temperature: 42F; Dew Point: 36F; Wind: WSW at 9 kts
Sea-level pressure: 29.98 ins. Hg, rising unsteadily
Visibility: 80 miles distant fog not limiting visbility WSW
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr precip: 0.26 ins.
BHO SA 1155 CLR 80 153/42/36/2409/998/ FEW CU DSNT SSE-S
DSNT FG WSW/ 8/100 52027 MANUAL 70026 ASOS 70026 10044 20042
10 A.M.
Weather: Clear, few cumulus distant S and NNW
Temperature: 53F; Dew Point: 37F; Wind: W at 9 kts
Sea-level pressure: 30.04 ins. Hg, rising, then more slowly
Visibility: 80 miles
BHO SA 1455 CLR 80 174/53/37/2709/004/ FEW CU DSNT S AND NNW/
8/100 51021
1 P.M.
Weather: Clear, few cirrus in all directions
Temperature: 58F; Dew Point: 45F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 30.04 ins. Hg, rising then falling
Visibility: 80 miles
6-hr Max temp: 59F
6-hr Min temp: 42F
BHO SA 1755 CLR 80 173/58/45/2406/004/ FEW CI ALQDS/ 8/001 58001
10059 20042
SUMMARY FOR THURSDAY, OCTOBER 26, 2017
TEMPERATURE (DEGREES F)
MAX…..60 NORMAL…..57
MIN…..44 NORMAL…..39
MEAN….52 NORMAL…..48
DEPARTURE FROM 30-YEAR NORMAL…………………….+4
TOTAL DEPARTURE FOR THE MONTH…………………..+227 [+8.5 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..24 DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………731 DEPARTURE……..+129
TOTAL COOLING UNITS LAST SEASON TO DATE…….901 DEPARTURE……..-170
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..13 DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH………….123 DEPARTURE……..-210
TOTAL HEATING UNITS FOR THE SEASON…………216 DEPARTURE……..-259
TOTAL HEATING UNITS LAST SEASON TO DATE…….321 DEPARTURE……..-105
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….40 W AT 8:27 P.M.
AERO……………………41 W AT 8:27 P.M.
ASOS……………………42 W AT 8:28 P.M.
DAVIS…………………..40 W AT 8:27 P.M. RMY 39
FASTEST MILE FOR YESTERDAY…………………29 W AT 8:27 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………29 W AT 9:01 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..28 WNW AT 8:42 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.5 ESE
ASOS………………….13.5
DAVIS…………………12.6 WSW [241 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.26 DEPARTURE……+0.10
ASOS…………..0.26
TOTAL PRECIPITATION FOR THE MONTH……….2.82 DEPARTURE……-1.09
ASOS…………..2.93
TOTAL PRECIPITATION FOR THE YEAR……….44.68 DEPARTURE……+1.69
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
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 65/42/54/-3/0.00/697/99 18 WNW AERO 16 NW RMY N/A
10/2 65/46/56/-1/0.00/687/98 21 NNW AERO 21 NNW RMY 21
10/3 67/50/59/+3/0.00/677/97 21 S AERO 21 S RMY N/A
10/4 75/50/63/+7/0.00/660/95 30 SSW AERO 30 SW RMY 32
10/5 79/60/70/+14/0.00/429/62 28 SW AERO 26 SW RMY N/A
10/6 73/57/65/+10/T/352/51 15 NW AERO 14 NW RMY 15
10/7 75/59/67/+12/T/344/50 29 S AERO 30 SSW RMY N/A
10/8 71/67/69/+15/0.23/007/01 33 S AERO 36 SSW RMY 37
10/9 71/68/70/+16/0.22/000/00 43 S AERO 41 S RMY 45
10/10 76/61/69/+15/0.00/637/94 21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/122/18 29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/169/25 30 NE AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/545/81 20 E AERO 16 E RMY 17
10/14 66/54/60/+8/…/637/94 15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/067/10 39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/…/146/22 28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/007/01 25 S AERO 22 S RMY 25
10/18 70/45/58/+7/0.00/659/100 25 SW AERO 23 SW RMY 22
10/19 72/52/62/+12/0.00/649/99 31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/…/.. 28 WNW AERO 25 WNW RMY 29
10/21 77/52/65/+15/0.00/…/.. 21 NW AERO 20 NW RMY 18
10/22 73/54/64/+15/0.00/…/.. 21 ENE AERO 16 ENE RMY 17
10/23 69/50/60/+11/0.00/…/.. 24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/…/…/.. 50 SSE AERO 51 S RMY N/A
10/25 69/57/63/+14/…/…/.. 50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/…/…/.. 40 W AERO 41 W RMY 39
10/27 Low temp since midnight is 42F; normal low is now 39F
DAILY RECORDS FOR OCTOBER
10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944
10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011
10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017
10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2001
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 27
HIGH 83F IN 1963
LOW 21F IN 1936
PRE 1.79 INCHES IN 1886
SNOW 2.5 INCHES IN 2011
WIND 54 MPH WNW IN 1968
RECORDS FOR OCTOBER 28
HIGH 81F IN 1919
LOW 23F IN 1914
PRECIP 2.46 INCHES IN 2006
SNOWFALL TRACE IN 1934,1957,1979
PEAK GUST 71 MPH SSW IN 1995
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
