Monday, July 15, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 15, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONABLE WITH A COOL WESTERLY WIND ATOP
GREAT BLUE HILL….

We observed fair weather with cloud cover decreasing into
the afternoon. Visibility was excellent at 85 miles this
morning, only dropping to 80 miles by 1 P.M. Humidity
has dropped to around 40%, with dew points in the mid 50s
throughout the day. Wind has increased as the day went on,
reaching around 15 mph shortly following noontime. The
high so far today is 80F, a degree below the daily normal
maximum of 81F. The low since midnight is 63F, the same as
the average minimum.

PRELIMINARY STATS FOR JUNE 2019

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1] Avg. Min. 57.3 [+0.2] Mean      66.2 [+0.1] 24-hour corrected mean: 66.0
Max. for month: 88F on the 28th
Min. for month: 45F on the 4th

COOLING DEGREE DAYS
Total cooling units:    81 [-24] Total for the season:   89 [-40] Total for last season: 159

HEATING DEGREE DAYS
Total cooling units:     36  [-37] Total for the season:  6254 [-122] Total for last season: 5916

PRECIPITATION, Inches
Total: 4.08 [-0.23] Greatest in 24 hrs: 1.30 ins. on the 10th-11th

WIND, mph
Avg. uncorrected wind speed: 9.9
Avg. corrected wind speed: 10.5
Prevailing wind direction: S at 17%
Peak gust and direction: 41 W on 3rd

SUNSHINE:
Campbell-Stokes card minutes: 14118 minutes of possible 26376 or 54%
Astronomical total minutes:   14674 minutes of possible 27416 or 54%

Today’s Observations:

7 A.M.
Weather: Broken cirrus
Temperature: 69F; Dew Point: 58F; Wind: W at 7 kts
Sea-level pressure: 30.03 ins. Hg, falling then rising
Visibility: 85 miles, distant haze
6-hr Max temp: 69F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 BKN 85 170/69/58/3007/003/ 8/002 51009
10069 20063

10 A.M.
Weather: Broken cirrus, few cumulus S-NW
Temperature: 75F; Dew Point: 55F; Wind: NW at 8 kts
Sea-level pressure: 30.03 ins. Hg, steady
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 85 170/75/55/3308/003/ FEW CU S-NW/
8/002 50000

1 P.M.
Weather: Scattered cirrostratus, few cumulus
Temperature: 80F; Dew Point: 56F; Wind: W at 10G20 kts
Sea-level pressure: 30.00 ins. Hg, falling, then more quickly
Visibility: 80 miles
6-hr Max temp: 80F
6-hr Min temp: 69F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 80 160/80/56/2710G20/000/ FEW CU ALQDS/
8/105 58010 10080 20069

SUMMARY FOR SUNDAY, JULY 14, 2019

TEMPERATURE (DEGREES F)
MAX…..87   NORMAL…..81
MIN…..68   NORMAL…..63
MEAN….78   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+6
TOTAL DEPARTURE FOR THE MONTH…………………+56 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..13   DEPARTURE………+6
TOTAL COOLING UNITS FOR THE MONTH………….145   DEPARTURE……..+52
TOTAL COOLING UNITS FOR THE SEASON…………234   DEPARTURE……..+12
TOTAL COOLING UNITS LAST SEASON TO DATE…….292   DEPARTURE……..-58

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 W   AT 1:08 P.M.
AERO…………………….21 W   AT 1:09 P.M.
ASOS…………………….24 W   AT 1:10 P.M.
DAVIS……………………25 W   AT 1:08 P.M.  RMY 23
FASTEST MILE FOR YESTERDAY………………….19 W   AT 1:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 W   AT 1:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 W   AT 1:09 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….9.8 W
ASOS…………………….9.7
DAVIS…………………..10.3 W [276 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.45  DEPARTURE……-0.22
ASOS…………..1.45
TOTAL PRECIPITATION FOR THE YEAR……….31.32  DEPARTURE……+2.68
ASOS………….31.22

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

06/01 71/54/63/+1/0.00/551/61               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/0.02/417/46               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/0.02/753/83               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/717/79               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/0.03/527/58               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/0.06/428/47               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/885/97               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/840/93               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/0.29/712/78               26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/1.03/247/27               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/0.00/869/95               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/0.81/000/00              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/540/59               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/879/96               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/0.13/000/00                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/0.00/348/38               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/0.10/000/00                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/0.00/101/11               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/0.26/000/00               26 S   AERO 26 S   RMY 29
06/21 68/58/63/-5/0.75/018/02               32 NW  AERO 28 NW  RMY 33
06/22 77/56/67/-1/T/779/85                  33 NW  AERO 32 NW  RMY 35
06/23 82/59/71/+3/0.00/871/95               30 NW  AERO 25 WNW RMY 29
06/24 84/61/73/+4/0.00/779/85               22 NW  AERO 21 NW  RMY 22
06/25 73/61/67/-2/0.18/083/09               35 S   AERO 37 S   RMY 37
06/26 77/64/71/+2/0.00/559/61               12 ENE AERO 18 SE  RMY N/A
06/27 81/57/69/0/0.00/614/67                21 NE  AERO 18 NE  RMY N/A
06/28 88/64/76/+6/0.00/870/95               16 SW  AERO 18 SW  RMY N/A
06/29 80/66/73/+3/0.29/165/18               25 W   AERO 25 W   RMY 26
06/30 75/59/67/-3/0.13/430/47               31 N   AERO 30 N   RMY 35

*Estimated

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

07/01 83/58/71/+1/0.00/…/..               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/..               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/…/..               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/…/..               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/…/..               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/…/..              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/…/..                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/…/..               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/…/..               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/…/..               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.44/…/..               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/…./…/..               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/…/..               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/…/..               25 W   AERO 21 W   RMY 23

07/15 Low temp since midnight is 63F; normal low is 63F

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

RECORDS FOR JULY 15
HIGH 94F IN 1995
LOW 50F IN 1929, 1930
PRECIP 1.64 INS IN 1896
WIND 71 MPH WNW IN 2002

RECORDS FOR JULY 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1889, 1903
PRECIP 0.97 INS IN 2014
WIND 48e MPH SW 1944

TODAY’S REPORT PREPARED BY: Benjamin Turner