Thursday, September 28, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 28, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
NEW RECORD HIGH TEMPERATURE SET YESTERDAY
Temperatures reached a record breaking 86F yesterday,
the previous record of 84F was first set back in 1998.
The high temperature so far today was 75F, although
this temperature felt milder compared to yesterday,
it is still 8 degrees above normal for today. The day
also felt milder because the humidity and dew points
fell significantly throughout the day with a relative
humidity of 93% at 7:00 AM EST dropping to 41% by 1:00
PM EST. With the high humidity the morning started out
with a distant fog limiting visibility to 30 miles.
After the distant fog lifted the visibility dramatically
improved to 80 miles by the 1:00 PM EST observation.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus
Temperature: 71F; Dew Point: 69F; Wind: NW at 9 kts
Sea-level pressure: 29.91 ins. Hg, steady then rising
Visibility: 30 miles, distant fog in all directions
6-hr Max temp: 72F
6-hr Min temp: 71F
24-hr precip: 0.00 in.
BHO SA 1155 E140 BKN 30 061/71/69/3109/971/ DSNT FG ALQDS/
8/030 57006 10072 20071
10 A.M.
Weather: Clear, few distant cumulus in all directions,
few altocumulus NNW-SSE
Temperature: 72F; Dew Point: 55F; Wind: NW at 13G18 kts
Sea-level pressure: 29.72 ins. Hg, falling then rising
Visibility: 75 miles
BHO SA 1455 CLR 75 063/72/55/3213G18/972/ FEW DSNT CU ALQDS FEW AC
NNW-SSE/ 8/130 53002
1 P.M.
Weather: Scattered cirrus, few distant cumulus ENE-SSE
and SSW-W, few altocumulus E
Temperature: 74F; Dew Point: 49F; Wind: NNW at 13G18 kts
Sea-level pressure: 29.70 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 75F
6-hr Min temp: 61F
BHO SA 1755 250 SCT 80 058/74/49/3413G18/970/ FEW DSNT CU
ENE-SSE AND SSW-W FEW AC E/ 8/131 58005 10075 20071
SUMMARY FOR WEDNESDAY, SEPTEMBER 27, 2017
TEMPERATURE (DEGREES F)
MAX…..86 NORMAL…..67
MIN…..64 NORMAL…..50
MEAN….75 NORMAL…..58
DEPARTURE FROM 30-YEAR NORMAL……………………+16
TOTAL DEPARTURE FOR THE MONTH……………………+88 [+3.1 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10 DEPARTURE……….+9
TOTAL COOLING UNITS FOR THE MONTH………….100 DEPARTURE………+42
TOTAL COOLING UNITS FOR THE SEASON…………707 DEPARTURE……..+112
TOTAL COOLING UNITS LAST SEASON TO DATE…….894 DEPARTURE……..-187
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE……….-7
TOTAL HEATING UNITS FOR THE MONTH…………..42 DEPARTURE………-52
TOTAL HEATING UNITS FOR THE SEASON………….68 DEPARTURE………-51
TOTAL HEATING UNITS LAST SEASON TO DATE……..46 DEPARTURE………+22
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 S AT 10:45 P.M.
AERO……………………20 S AT 7:15 P.M.
ASOS……………………23 S AT 10:45 P.M.
DAVIS…………………..19 SSW AT 3:34 P.M. RMY 22
FASTEST MILE FOR YESTERDAY…………………15 S AT 6:49 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 S AT 6:49 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 S AT 3:38 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.4 S
ASOS…………………..9.6
DAVIS………………….7.8 SSW [204 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……….3.17 DEPARTURE……-0.45
ASOS…………..3.24
TOTAL PRECIPITATION FOR THE YEAR……….39.53 DEPARTURE……+0.89
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
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
9/1 68/47/58/-10/0.00/749/95 26 WNW AERO 28 WNW RMY 31
9/2 72/46/59/-9/0.00/542/69 18 NNW AERO 18 NNW RMY 21
9/3 63/52/58/-9/0.24/000/00 33 W AERO 33 W RMY 37
9/4 79/55/67/0/0.00/702/90 29 SSW AERO 28 SSW RMY N/A
9/5 84/62/73/+6/0.00/583/75 36 S AERO 32 S RMY 38
9/6 76/59/68/+1/0.49/070/09 28 S AERO 28 S RMY 30 TSTM
9/7 74/58/66/0/0.79/417/54 24*WSW AERO 23 WSW RMY 24
9/8 74/53/64/-2/0.00/577/75 21 WSW AERO 18 WSW RMY 22
9/9 68/51/60/-5/T/620/81 18 ENE AERO 16 ENE RMY 18
9/10 71/51/61/-4/0.00/694/91 18 NW AERO 16 NW RMY N/A
9/11 78/50/64/-1/0.00/692/91 20 NNW AERO 17 NNW RMY 20
9/12 84/58/71/+6/0.00/690/91 22 WSW AERO 18 WSW RMY 23
9/13 84/59/72/+8/T/680/90 18 WSW AERO 15 WSW RMY 20 TSTM
9/14 82/66/74/+10/0.00/233/31 23 SW AERO 23 WSW RMY 25 TSTM
9/15 83/66/75/+11/0.05/300/40 18 WNW AERO 15 WNW RMY 18
9/16 78/65/72/+9/T/261/35 14 E AERO 9 E RMY 12
9/17 79/61/70/+7/T/334/45 15 SSE AERO 14 SSE RMY 15
9/18 67/62/65/+3/0.02/000/00 21 NE AERO 18 NE RMY N/A
9/19 63/61/62/0/0.13/000/00 28 NE* AERO 25 NNE RMY N/A
9/20 68/62/65/+3/0.67/000/00 41 NNE AERO 44 NNE RMY 45
9/21 69/60/65/+4/0.00/242/33 47 NNE AERO 44 NNE RMY 50
9/22 60/54/57/-4/0.57/…/.. 40 NNE AERO 38 NNE RMY N/A
9/23 74/59/67/+7/0.21/…/.. 29 NNE AERO 29 NNE RMY N/A
9/24 85/63/74/+14/0.00/…/.. 16 N AERO 14 N* RMY N/A
9/25 86/66/76/+16/0.00/…/.. 15 ESE*AERO 13 ESE RMY 14
9/26 84/66/75/+16/0.00/…/.. 15 SW AERO 12 SW* RMY 14
9/27 86/64/75/+16/0.00/…/.. 21 S AERO 20 S RMY 22
9/27 Low temp since midnight is 71F; normal low is now 50F
DAILY RECORDS FOR SEPTEMBER
9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
TIES PREVIOUS RECORD SET IN 1975
9/27/17: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 86F
BREAKS PREVIOUS RECORD SET IN 1998 AND TIED IN 2014
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR SEPTEMBER 28
HIGH 86F IN 2014
LOW 33F IN 1897,1947
PRECIP 2.46 INCHES IN 2004
PEAK GUST 69 MPH NE IN 1962
RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
