Friday, July 28, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 28, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

BACK TO SEASONABLE TEMPERATURES AND HUMIDITY

After a few cooler days we are back to normal temperatures for July
here on top of Great Blue Hill. We had a high of 81F by 1:00 P.M. which
is also the normal for today as well. We had a mostly sunny day with some
towering cumulus forming to the west during the 1:00 P.M. EST observation.
Winds from the W-WNW remained light all day.
While today has remained dry an overnight rain storm left 0.04 inches of
precipitation. Humidity also dropped throughout the day making a drier
afternoon.

Today’s Observations:

7 A.M.
Weather: Clear sky few altocumulus W-NE, few cirrus S-N
Temperature: 68F; Dew Point: 65F; Wind: WNW at 6 kts,
Wind: Light
Sea-level pressure: 29.86 ins. Hg
Visibility: 35 miles, distant fog in all directions
6-hr Max temp: 68F
6-hr Min temp: 65F
24-hr precip: 0.04 in.
BHO SA 1155 CLR 35 117/68/65/2906/986/ FEW AC W-NE FEW CI S-N
DSNT FG ALQDS WND LGT/ 8/031 58003 MANUAL 70004 ASOS 70005
10068 20065

10 A.M.
Weather: Few cumulus all directions, scattered cirrus
Temperature: 78F; Dew Point: 63F; Wind: NW at 4 kts,
Wind: Light
Sea-level pressure: 29.86 ins. Hg
Visibility: 40 miles, distant fog SW-NW
BHO SA 1455 250 SCT 40 113/78/63/3104/986/ FEW CU ALQDS DSNT FG
SW-NW WND LGT/ 8/101 56004

1 P.M.
Weather:  Few towering cumulus and scattered cumulus, scattered cirrus
Temperature: 80F; Dew Point: 66F; Wind: NW at 4 kts,
Wind: Light
Sea-level pressure: 29.85 ins. Hg
Visibility: 70 miles
6-hr Max temp: 81F
6-hr Min temp: 68F
6-hr precip: 0.00
BHO SA 1755 54 SCT 250 SCT 70 108/80/66/3204/985/ FEW TCU WSW-NNW
WND LGT/ 8/202 58005 10081 20068

SUMMARY FOR THURSDAY, JULY 27, 2017

TEMPERATURE (DEGREES F)
MAX…..72   NORMAL…..81
MIN…..59   NORMAL…..63
MEAN….66   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….-6
TOTAL DEPARTURE FOR THE MONTH…………………….+2 [-0.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH………….203   DEPARTURE………+10
TOTAL COOLING UNITS FOR THE SEASON…………404   DEPARTURE………+82
TOTAL COOLING UNITS LAST SEASON TO DATE…….434   DEPARTURE………-30

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 SSW AT 11:22 A.M.
AERO……………………23 SW  AT  9:57 A.M.
ASOS……………………22 SSW AT  9:57 A.M.
DAVIS…………………..21 SSW AT  9:57 A.M. RMY 22
FASTEST MILE FOR YESTERDAY…………………15 SW  AT  9:05 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 SSW AT  5:47 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 SSW AT  9:06 A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.2 SW
ASOS………………….11.7
DAVIS…………………10.9 SSW [220 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.11
ASOS…………..0.05
TOTAL PRECIPITATION FOR THE MONTH……….3.39  DEPARTURE……-0.03
ASOS…………..3.36
TOTAL PRECIPITATION FOR THE YEAR……….34.76  DEPARTURE……+4.37
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/-14/1.74/…/..              38 NE  AERO 37 ENE RMY 38
7/25 63/54/59/-13/0.03/…/..              23 NNE AERO 21 NNE RMY N/A
7/26 79/55/67/-5/0.00/…/..               21 S*  AERO 22 SSE RMY N/A
7/27 72/59/66/-6/0.04/…/..               21 SSW AERO 23 SW  RMY 22

7/28 Low temp since midnight is 64F; 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 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

TODAY’S REPORT PREPARED BY: Kaitlin Geagan