Saturday, October 21, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, OCTOBER 21, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNNY SKIES CONTINUE AS OCTOBER TEMPERATURES
REMAIN ABOVE AVERAGE
With high pressure stalling in the area, clear
and dry conditions continue. The sky remained mostly
clear with a few cirrus clouds at each observation.
The air remained very dry overnight and continues
to be dry today with humidities remaining below 50%.
The visibility today remained high at 70 miles for
all observations. A distant smoke layer on the
horizon over the ocean to the NE was in place by the
10 o’clock observation. Winds remained from a westerly
direction blowing from the west-northwest early before
shifting to the west-southwest. Temperatures continue
to be above average with this October being among the
five warmest in Observatory history so far.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus distant S-SW, few altocumulus
distant NNW-NNE
Temperature: 55F; Dew Point: 33F; Wind: W at 7 kts
Sea-level pressure: 30.28 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 55F
6-hr Min temp: 52F
24-hr precip: 0.00 ins.
BHO SA 1155 CLR 70 254/55/33/2607/028/ FEW CI DSNT S-SW
FEW AC DSNT NNW-NNE/ 8/001 53015 10055 20052
10 A.M.
Weather: Clear, Few cirrus distant S-SW, smoke layer along
horizon NNE-ENE
Temperature: 65F; Dew Point: 42F; Wind: WSW at 06 kts
Wind: Light
Sea-level pressure: 30.31 ins. Hg, rising then more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 266/65/42/2506/031/ FEW CI DSNT S-SW
K LYR ALG HRZN NNE-ENE WND LGT/ 8/001 51012
1 P.M.
Weather: Scattered cirrus
Temperature: 75F; Dew Point: 41F; Wind: SW at 7 kts
Sea-level pressure: 30.28 ins. Hg, rising, then falling
Visibility: 75 miles
6-hr Max temp: 76F
6-hr Min temp: 55F
BHO SA 1755 300 SCT 75 253/75/41/2307/028/ 8/001 58013
10076 20055
SUMMARY FOR FRIDAY, OCTOBER 20, 2017
TEMPERATURE (DEGREES F)
MAX…..68 NORMAL…..59
MIN…..53 NORMAL…..41
MEAN….61 NORMAL…..50
DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH…………………..+148 [+7.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..20 DEPARTURE………+15
TOTAL COOLING UNITS FOR THE SEASON…………727 DEPARTURE……..+125
TOTAL COOLING UNITS LAST SEASON TO DATE…….900 DEPARTURE……..-173
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4 DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH………….102 DEPARTURE……..-134
TOTAL HEATING UNITS FOR THE SEASON…………195 DEPARTURE……..-183
TOTAL HEATING UNITS LAST SEASON TO DATE…….229 DEPARTURE………-34
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 WNW AT 2:27 P.M.
AERO……………………25 WNW AT 2:27 P.M.
ASOS……………………28 WNW AT 2:27 P.M.
DAVIS…………………..26 WNW AT 1:35 P.M. RMY 29
FASTEST MILE FOR YESTERDAY…………………19 WNW AT 2:28 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 NW AT 2:18 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 NW AT 2:29 P.M.
AVERAGE WIND SPEED AND DIRECTION………….13.4 WNW
ASOS………………….13.1
DAVIS…………………12.7 WNW [300 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……….0.50 DEPARTURE……-2.48
ASOS…………..0.50
TOTAL PRECIPITATION FOR THE YEAR……….42.36 DEPARTURE……+0.30
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/…/.. 30 NE AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/…/.. 20 E AERO 16 E RMY 17
10/14 66/54/60/+8/…/…/.. 15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/…/.. 39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/…/…/.. 28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/…/.. 25 S AERO 22 S RMY 25
10/18 70/45/58/+7/0.00/../.. 25 SW AERO 23 SW RMY 22
10/19 72/52/62/+12/0.00/../.. 31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/../.. 28 WNW AERO 25 WNW RMY 29
10/21 Low temp since midnight is 52F; normal low is now 41F
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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976
RECORDS FOR OCTOBER 22
HIGH 85F IN 1979
LOW 22F IN 1940
PRECIP 2.38 INCHES IN 2014
SNOWFALL TRACE IN 1969, 2010
PEAK GUST 67 MPH ESE IN 1988
TODAY’S REPORT PREPARED BY: Mike Iacono / Rob Millette
