BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 13, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME
 
GBH SUMMIT VEILED IN THICK FOG AND LIGHT DRIZZLE ALL MORNING
FOG LIFTING IN EARLY AFTERNOON, BUT LOW CLOUDS AND HUMIDITY LINGER
 
Early morning rain totaled 0.07 inch by our first observation today with
only a trace of precipitation afterward. A low bank of stratocumulus
left us marooned in fog for the majority of the day, with visibility
around 1/16 of a mile through noon EST and humidity hovering in the high
90s. Winds have been light and variable throughout the day swinging between
WNW and ESE, though dominantly from the ENE at around 5 MPH.
 
Today's Observations:
 
7 A.M.
Weather: Drizzle, stratus drifting over the summit
Temperature: 63F; Dew Point: 63F; Wind: ENE at 7 kts,
Sea-level pressure: 30.30 ins. Hg, increasing then increasing more rapidly
Visibility: 1/16 mile, thick fog
24-hr precip: 0.08 inch
6-hr min. temp: 62F
BHO SA 1155 W3 X 1/16DZF 261/63/63/0707/030/ STRA DRFTNG OVR SMT
LGHT PCPN/ 8//// 53017 ASOS 70007 MANUAL 70008 10063 20062
 
10 A.M.
Weather: Light drizzle, stratus drifting over the summit
Temperature: 67F; Dew Point: 67F; Wind: E at 4 kts,
Wind: Direction variable NE-ESE
Sea-level pressure: 30.32 ins. Hg, increasing then increasing more rapidly
Visibility: 1/16 mile, thick fog
3-hr precip: Trace
BHO SA 1455 W2 X 1/16-DZF 268/67/67/0904/032/ STRA DRFTNG OVR SMT
VLGHT PCPN WIND DIR VBL 040-110 LGT WIND/ 8//// 53007 6000T
 
1 P.M.
Weather: Overcast stratocumulus of varying thickness
Temperature: 71F; Dew Point: 68F; Wind: ENE at 6 kts,
Sea-level pressure: 30.32 ins. Hg, increasing then decreasing
Visibility: 15 miles, thin fog
Visibility: Variable 20 miles N-E, 10 miles SW
6-hr max. temp: 72F
6-hr precip: Trace
BHO SA 1755 012 OVC 15-F 269/71/68/0606/032/ WND LGHT AND VBL 000-090
VSBY VBL 20 N-E 10 SW/ 8/6// 50001 6000T 10072 20063
 
WEATHER SUMMARY FOR FRIDAY, JULY 12, 2013
 
TEMPERATURE (DEGREES F)
MAX.....70     NORMAL.....81
MIN.....62     NORMAL.....63
MEAN....66     NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL.....................-6
TOTAL DEPARTURE FOR THE MONTH....................+52 [+4.3 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY................29  NE  AT  10:32 A.M.
                   AERO.....................29  NE  AT  10:32 A.M.
                   ASOS.....................30  NE  AT  8:30 A.M.
                   DAVIS....................29  NNE AT  8:17 A.M. RMY 30
FASTEST MILE FOR YESTERDAY..................19  NE  AT  10:30 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...............21  NE  AT  10:32 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE..............19  NNE AT  10:32 A.M.
AVERAGE WIND SPEED AND DIRECTION...........12.7 NE
                   ASOS....................12.2
                   DAVIS...................11.3 NE [46 deg]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.07   DEPARTURE............-0.06
                         ASOS..............0.08
TOTAL PRECIPITATION FOR THE MONTH..........0.93   DEPARTURE............-0.38
                         ASOS..............1.01
TOTAL PRECIPITATION FOR THE YEAR..........33.20   DEPARTURE............+4.85
                         ASOS..............N/A*
*ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals 
     
PRELIMINARY CLIMATE SUMMARY FOR JULY 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
                             
7/1  82/69/76/+6/0.05/247/27         29 S   AERO 31 MPH SSW RMY 32
7/2  82/61/72/+2/T/100/11            23 SSW AERO 23 MPH SSW RMY 25
7/3  87/62/75/+4/T/556/61            28 SW  AERO 30 MPH SW  RMY 30
7/4  90/71/81/+10/0.00/811/89        25 WSW AERO 26 MPH SW  RMY 28
7/5  92/73/83/+12/0.00/874/96        24 W   AERO 25 MPH WSW RMY 25
7/6  90/73/82/+11/0.00/836/92        25 WNW AERO 25 MPH WNW RMY 26
7/7  91/72/82/+11/0.21/508/56        38 SSW AERO 43 MPH SSW RMY 44  TSTM
7/8  82/64/73/+1/0.04/.../..         18 NE  AERO 20 MPH NE  RMY 20  TSTM
7/9  72/63/68/-4/0.01/.../..         14 ENE AERO 14 MPH ENE RMY 14 
7/10 84/65/75/+3/T/.../..            32 S   AERO 36 MPH S   RMY 35
7/11 79/69/74/+2/0.62/.../..         23 W   AERO 23 MPH W   RMY N/A
7/12 70/62/66/-6/0.07/.../..         29 NE  AERO 29 MPH NE  RMY 30
 
7/13 morning low temp: 63F; the normal low is now 63F
 
DAILY RECORDS FOR JULY 2013
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996
 
RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 1.97 INS IN 1960
WIND 110e MPH NW IN 1942 [RECORD FOR MONTH]
 
TODAY'S REPORT PREPARED BY: Forrest Iwanik and Will Wilson