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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 23, 2017  
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY HUMID MORNING CLEARS FOR MILD DAY  

The morning started with a dense fog that limited 
visibility to 1/8 of a mile at 7:00 AM and 1/2 
of a mile a 10:00 AM EST. The fog moved out of 
the area before 1:00 PM EST but lingered in the 
distance limiting visibility to 45 miles. 

Winds have been light and variable from the SSE.
The wind started to slightly pick up in the 
afternoon with a peak gust of 14 kts (16 MPH) by 
1:00 PM EST. The southerly wind is causing 
temperatures to continue to be above seasonable 
with a high of 73F yesterday, which is 15 degrees
above the normal, and 68F by 1:00 PM EST today. 
Today's temperature so far is already 10 degrees 
above the normal for this day. So far this October 
is among the five warmest in Observatory history.  
 
Today's Observations:

7 A.M.
Weather: Fog
Temperature: 51F; Dew Point: 51F; Wind: SE at 2 kts,
Wind: Light
Sea-level pressure: 30.40 ins. Hg, falling then rising 
Visibility: 1/8 mile   
6-hr Max temp: 54F
6-hr Min temp: 50F
24-hr precip: 0.00 ins. 
BHO SA 1155 W3 X 1/8F 295/51/51/1402/040/ WND LGT/ 8//// 53005 
10054 20050

10 A.M.
Weather: Fog
Temperature: 58F; Dew Point: 58F; Wind: SE at 3 kts,
Wind: Light
Sea-level pressure: 30.37 ins. Hg, steady then falling
Visibility: 1/2 mile  
BHO SA 1455 W3 X 1/2F 285/58/58/1403/037/ WND LGT/ 8//// 58010 

1 P.M. 
Weather:  Scattered stratocumulus, few distant cumulus in all
directions, few altocmulus SSW-W, few cirrus overhead
Temperature: 68F; Dew Point: 60F; Wind: SSE at 7 kts
Sea-level pressure: 30.30 ins. Hg, falling, then more rapidly
Visibility: 45 miles distant fog in all directions  
6-hr Max temp: 68F 
6-hr Min temp: 51F
BHO SA 1755 33 SCT 45 260/68/60/1607/030/ FEW CU DSNT ALQDS 
FEW AC SSW-W FEW CI OVHD DSNT FG ALQDS/ 8/491 58025 10068 20051

SUMMARY FOR SUNDAY, OCTOBER 22, 2017
 
TEMPERATURE (DEGREES F)
MAX.....73   NORMAL.....58
MIN.....54   NORMAL.....41
MEAN....64   NORMAL.....49

DEPARTURE FROM 30-YEAR NORMAL........................+15
TOTAL DEPARTURE FOR THE MONTH.......................+178 [+7.9 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...............1   DEPARTURE.........-15
TOTAL HEATING UNITS FOR THE MONTH.............103   DEPARTURE........-164
TOTAL HEATING UNITS FOR THE SEASON............196   DEPARTURE........-213
TOTAL HEATING UNITS LAST SEASON TO DATE.......241   DEPARTURE.........-45

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................21  ENE AT 4:59 P.M. 
                   AERO........................16  ENE AT 5:00 P.M.
                   ASOS........................20  E   AT 5:00 P.M.
                   DAVIS.......................18  E   AT 4:59 P.M.  RMY 17 
FASTEST MILE FOR YESTERDAY.....................15  ENE AT 4:59 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................16  ENE AT 5:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE.................15  ENE AT 5:00 P.M.
AVERAGE WIND SPEED AND DIRECTION..............7.2  ENE
                   ASOS.......................8.0
                   DAVIS......................7.2  NE   [43 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.16
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.50  DEPARTURE......-2.79
                         ASOS..............0.50
TOTAL PRECIPITATION FOR THE YEAR..........42.36  DEPARTURE......-0.01
                         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 73/54/64/+15/0.00/.../..            21 ENE AERO 16 ENE RMY 17

10/23 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 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

RECORDS FOR OCTOBER 24
HIGH 79F IN 1963
LOW 22F IN 1969
PRECIP 2.96 INCHES IN 1890
SNOWFALL 1.8 INCHES IN 1960
PEAK GUST 70 MPH SE IN 1959

TODAY'S REPORT PREPARED BY: Kaitlin Geagan/ Afshin Pourmokhtarian