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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 22, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER SUNNY, DRY, AND WARM DAY ON TOP OF 
GREAT BLUE HILL

High pressure continues to stall in the area bringing
clear and dry conditions. The sky remained mostly 
sunny with scattered cirrostratus and cirrocumulus
overhead at 7:00 AM EST, scattered cirrostratus
and a few altocumulus at 10:00 AM EST and then
scattered cirrus at 1:00 PM.
The air has remained very dry overnight and continues
to be dry today with humidities remaining below 55%. 
The visibility today was 70 miles at each observation 
due to a distant haze which remained in the area all day. 
Winds have been light and variable today shifting from 
the west overnight to the NE by 1:00 PM EST. Temperatures 
continue to be above average with a high of 73F by 1:00 PM 
EST. This is 15 degrees above the normal of 58F for this 
day. So far this October is among the five warmest in 
Observatory history.  
 
Today's Observations:

7 A.M.
Weather: Broken cirrostratus, patches of cirrocumulus overhead
Temperature: 61F; Dew Point: 41F; Wind: N at 7 kts
Sea-level pressure: 30.41 ins. Hg, rising, then more quickly
Visibility: 70 miles   
6-hr Max temp: 61F
6-hr Min temp: 59F
24-hr precip: 0.00 ins. 
BHO SA 1155 E250 BKN 70 298/61/41/3507/041/ PTCHS CC OVHD 
8/002 53015 10061 20059 

10 A.M.
Weather: Scattered cirrostratus, few altocumulus in
all directions
Temperature: 69F; Dew Point: 45F; Wind: E at 4 kts,
Wind: Light
Sea-level pressure: 30.43 ins. Hg, rising then falling
Visibility: 70 miles distant haze in all directions 
BHO SA 1455 250 SCT 70 305/69/45/1004/043/ FEW AC ALQDS DSNT
HZ ALQDS/ 8/056 50007 

1 P.M. 
Weather:  Scattered cirrus
Temperature: 70F; Dew Point: 52F; Wind: NE at 8 kts
Sea-level pressure: 30.41 ins. Hg, falling, then more slowly
Visibility: 70 miles distant haze in all directions  
6-hr Max temp: 73F 
6-hr Min temp: 62F
BHO SA 1755 250 SCT 70 298/70/52/0508/041/ DSNT HZ ALQDS/ 8/020 
58007 10073 20062

SUMMARY FOR SATURDAY, OCTOBER 21, 2017
 
TEMPERATURE (DEGREES F)
MAX.....77   NORMAL.....59
MIN.....52   NORMAL.....41
MEAN....65   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL........................+15
TOTAL DEPARTURE FOR THE MONTH.......................+163 [+7.6 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.......901   DEPARTURE........-174

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE.........-15
TOTAL HEATING UNITS FOR THE MONTH.............102   DEPARTURE........-149
TOTAL HEATING UNITS FOR THE SEASON............195   DEPARTURE........-198
TOTAL HEATING UNITS LAST SEASON TO DATE.......229   DEPARTURE.........-34

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................21  NW  AT 3:12 A.M. 
                   AERO........................20  NW  AT 3:12 A.M.
                   ASOS........................21  NW  AT 3:12 A.M.
                   DAVIS.......................20  NW  AT 3:11 A.M.  RMY N/A 
FASTEST MILE FOR YESTERDAY.....................16  NW  AT 3:09 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................16  NW  AT 3:13 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................16  NW  AT 3:12 A.M.
AVERAGE WIND SPEED AND DIRECTION..............9.1  WSW
                   ASOS.......................9.5
                   DAVIS......................8.8  W   [278 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......-2.63
                         ASOS..............0.50
TOTAL PRECIPITATION FOR THE YEAR..........42.36  DEPARTURE......+0.15
                         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 77/52/65/+15/0.00/.../..            21 NW  AERO 20 NW  RMY 18 

10/22 Low temp since midnight is 59F; 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 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

RECORDS FOR OCTOBER 23
HIGH 82F IN 1947
LOW 24F IN 1969
PRECIP 3.66 INCHES IN 2014
SNOWFALL 3.0 INCHES IN 1891
PEAK GUST 78e MPH NW IN 1941

TODAY'S REPORT PREPARED BY: Kaitlin Geagan