Tuesday, July 25, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 25, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

1.73 IN OF RAIN MEASURED THIS MORNING,
FOG GRADUALLY CLEARS FROM SUMMIT

Rain continued to fall into yesterday evening, turning into
light drizzle shortly before midnight.  Precip. measured
1.73 in. at 7:00AM EST this morning for the previous 24 hours.
This brings the monthly total to 3.35 in. and the monthly
departure to 0.36 in. above normal.  Only a trace has fallen
since 7:00AM.

Yesterday’s max. temperature of 62F tied the record for the
low maximum temperature.  The record was originally set in
1904 and tied again in 1964.  Temperatures have remained quite
cool so far today with a max. of only 58F by the 1:00PM ob.

Today’s Observations:

7 A.M.
Weather: Light drizzle, sky obscurement due to fog
Temperature: 55F; Dew Point: 55F; Wind: N at 6 kts,
Wind speed: Light
Sea-level pressure: 30.08 ins. Hg, rising, then more quickly
Visibility: 1/8 mile
6-hr Max temp: 55F
6-hr Min temp: 54F
24-hr precip: 1.73 in.
BHO SA 1155 W3 X 1/8L-F 186/55/55/3606/008/ WND LGT/ 8//// 53021
MANUAL 70173 ASOS 70177 10055 20054

10 A.M.
Weather: Overcast stratus
Temperature: 56F; Dew Point: 56F; Wind: NNE at 6 kts,
Wind speed: Light
Sea-level pressure: 30.12 ins. Hg, rising, then more slowly
Visibility: 15 miles, except 8 miles NNW-NNE, distant fog in all
directions
3-hr precip: Trace
BHO SA 1455 E6 OVC 15 199/56/56/0206/012/ VSBY NNW-NNE 8 DSNT FG
ALQDS WND LGT/ 8/6// 51013 MANUAL 600//

1 P.M.
Weather: Few cumulus fractus in all directions, overcast stratus
Temperature: 58F; Dew Point: 57F; Wind: estimated N at 3 kts,
Wind speed: Light
Sea-level pressure: 30.14 ins. Hg, rising then steady
Visibility: 30 miles, distant fog in all directions
6-hr Max temp: 58F
6-hr Min temp: 55F
6-hr precip: Trace
BHO SA 1755 E19 OVC 30 208/58/57/E3603/014/ FEW CUFRA ALQDS DSNT
FG ALQDS WND LGT/ 8/7// 51009 MANUAL 600// 10058 20055

SUMMARY FOR MONDAY, JULY 24, 2017

TEMPERATURE (DEGREES F)
MAX…..62   NORMAL…..81
MIN…..54   NORMAL…..63
MEAN….58   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL……………………-14
TOTAL DEPARTURE FOR THE MONTH……………………+19 [+0.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE MONTH………….200   DEPARTURE………+31
TOTAL COOLING UNITS FOR THE SEASON…………401   DEPARTURE……..+103
TOTAL COOLING UNITS LAST SEASON TO DATE…….382   DEPARTURE………+19

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….38 NE  AT 2:45 P.M.
AERO……………………37 ENE AT 2:54 P.M.
ASOS……………………39 NE  AT 3:09 P.M.
DAVIS…………………..35 NE  AT 2:45 P.M. RMY 38
FASTEST MILE FOR YESTERDAY…………………24 NE  AT 3:13 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 NE  AT 3:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 NE  AT 2:27 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.7 NNE
ASOS………………….14.2
DAVIS…………………12.7 NE [054 DEG.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.73  DEPARTURE……+1.60
ASOS…………..1.77
TOTAL PRECIPITATION FOR THE MONTH……….3.35  DEPARTURE……+0.36
ASOS…………..3.36
TOTAL PRECIPITATION FOR THE YEAR……….34.72  DEPARTURE……+4.76
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1  85/67/76/+6/T/439/48                  35 S   AERO 37 S   RMY 38
7/2  87/69/78/+8/T/785/86                  25 W*  AERO 28 W*  RMY 27
7/3  85/67/76/+5/0.00/894/98               28 W*  AERO 29 W   RMY 30
7/4  84/62/73/+2/0.00/783/86               17 W   AERO 17 W   RMY 18
7/5  82/62/72/+1/0.00/855/94               20 S   AERO 20 ENE RMY 20
7/6  82/60/71/+0/0.00/664/73               21 SSW AERO 22 SSW RMY 21
7/7  71/60/66/-5/0.63/000/00               28 ENE AERO 28 ENE RMY 27
7/8  84/61/73/+1/0.15/463/51               30 SW* AERO 32 SSW RMY 33  TSTM
7/9  81/60/71/-1/0.00/897/99               26 W   AERO 26 W   RMY 26
7/10 85/63/74/+2/T/751/83                  25 SW  AERO 25 S   RMY 26
7/11 82/66/74/+2/0.25/253/28               24 S   AERO 24 S   RMY N/A
7/12 85/68/77/+5/0.43/325/36               23 NE  AERO 22 NE  RMY 23  TSTM
7/13 68/55/62/-10/0.03/000/00              28 NNE AERO 28 NE  RMY 29
7/14 63/56/60/-12/0.02/000/00              15 E   AERO 14 E   RMY 14
7/15 80/60/70/-2/0.00/296/33               18 S   AERO 16 S   RMY 18
7/16 87/64/76/+4/0.00/852/95               18 SSE AERO 16 E   RMY 17
7/17 84/68/76/+4/0.00/680/76               25 S   AERO 25 S*  RMY 25
7/18 85/68/77/+5/0.07/500/56               23 S   AERO 23 S   RMY 23
7/19 90/70/80/+8/0.00/794/89               22 SW  AERO 22 SW* RMY 22
7/20 90/70/80/+8/0.00/623/70               21 WSW AERO 22 WSW RMY 21
7/21 90/68/79/+7/0.00/…/..               26 W   AERO 26 W   RMY 27
7/22 87/70/79/+7/T/…/..                  20 WNW AERO 20 WNW RMY N/A
7/23 72/61/67/-5/T/…/..                  33 NE  AERO 32 NE  RMY 33
7/24 62/54/58/-14/…./…/..              38 NE  AERO 37 ENE RMY 38

7/25 Low temp since midnight is 54F; normal low is now 63F

DAILY RECORDS FOR JULY

7/24/17: DAILY RECORD LOW MAXIMUM TEMPERATURE OF 62F,
TIES PREVIOUS RECORD SET IN 1904 AND TIED IN 1964

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JULY 25
HIGH 96F IN 2016
LOW 51F IN 1901,1953
PRECIP 2.25 INS IN 1990
PEAK GUST 88 MPH NW IN 1972

RECORDS FOR JULY 26
HIGH 97F IN 1963
LOW 47F IN 1920
PRE 2.05 INS IN 1899
WIND 74e MPH NNW IN 1940

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle