Thursday, June 2, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JUNE 2, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

LOW CLOUDS AND NORTHEASTERLY WINDS KEEP TEMPS COOL…
MAY 2016 FINISHES WARMER AND WETTER THAN NORMAL…

Fog enveloped Great Blue Hill early this morning offering
a visibility of 1 mile at the 7:00AM EST observation.  It was
slow to burn off as the sun rose.  Visibility increased to 20
miles by 10:00AM, but skies were still overcast with low stratus.
Blue sky could be seen by the 1:00PM observation as the stratus
layer turned into scattered cumulus and scattered cirrus clouds.

Temperatures remained cooler than average during the afternoon.
By the 1:00PM observation, the maximum temp. was only 68F, 3F
below normal.

After running cooler than normal for most of the month, the
warm temperatures of the last week of May raised the mean
temperature enough for it to finish warmer than normal.
Despite a wet and cloudy first week of May, the rest of the
month was relatively dry except for the nearly inch of rain
that fell on the 30th.  The total precipitation of 3.13 inches
was about an inch drier than the 30-year normal for May.
The month also brought the first 90-degree day of the year
on the 28th and the second thunderstorm day of the year on
the 24th.

PRELIMINARY STATS FOR MAY 2016

TEMPERATURE, Deg. F
Avg. Max. 66.9 [+0.6] Avg. Min. 48.8 [+1.0] Mean      57.9 [+0.8] 24-hour corrected mean: 57.2
Max. for month: 92 on 28th
Min. for month: 38 on 16th

HEATING DEGREE DAYS
Total heating units: 256 [-12] Total for the season: 5248 [-1055] Total for last season: 6404

PRECIPITATION, Inches
Total: 3.13 [-0.98] Greatest in 24 hrs: 0.94 in. on 30th

SNOWFALL, Inches
Total: T [0.0] Greatest in 24 hrs: Trace on the 1st

WIND, mph
Avg. uncorrected wind speed: 10.7
Avg. corrected wind speed: 11.3
Prevailing wind direction: W at 15%
Peak gust and direction: 50 W on 15th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Thick fog
Temperature: 55F; Dew Point: 54F; Wind: estimated ENE at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.23 ins. Hg, rising, then more slowly
Visibility: 1 mile
6-hr Max temp: 55F
6-hr Min temp: 54F
24-hr precip: 0.00 in.
BHO SA 1155 W3 X 1F 236/55/54/E0606/023/ WND L/V/
8//// 51011 10055 20054

10 A.M.
Weather: Overcast stratus
Temperature: 61F; Dew Point: 54F; Wind: estimated E at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.23 ins. Hg, rising, then more slowly
Visibility: 20 miles, distant haze
BHO SA 1455 E4 OVC 20 237/61/54/E0806/023/ DSNT HZ WND L/V/
8/6// 51001

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 67F; Dew Point: 56F; Wind: NE at 8 kts
Sea-level pressure: 30.19 ins. Hg, rising, then falling
Visibility: 20 miles, distant haze
6-hr Max temp: 68F
6-hr Min temp: 55F
BHO SA 1755 20 SCT 220 SCT 20 223/67/56/0408/019/ DSNT HZ/
8/101 58014 10068 20055

SUMMARY FOR WEDNESDAY, JUNE 1, 2016

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..71
MIN…..54   NORMAL…..53
MEAN….63   NORMAL…..62

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………….+1 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2   DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH……………2   DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE SEASON………..5250   DEPARTURE…….-1058
TOTAL HEATING UNITS LAST SEASON TO DATE……6422   DIFFERENCE……-1172

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….26 NE   AT  7:24 A.M.
ASOS……………………31 NE   AT  7:25 A.M.
DAVIS…………………..28 NE   AT  7:25 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………19 ENE  AT 10:45 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 ENE  AT 10:45 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..18 NE   AT  7:26 A.M.
AVERAGE WIND SPEED AND DIRECTION………….11.5 NE
ASOS………………….11.7
DAVIS…………………10.2 NE [050 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….20.07  DEPARTURE……-2.76
ASOS………….20.44

PRELIMINARY CLIMATE SUMMARY FOR MAY 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

5/1 52/39/46/-7/0.08/T/000/00               21 S   AERO 22 SE  RMY 20
5/2 50/41/46/-7/0.31/0.0/000/00             20 NE  AERO 21 NE  RMY 18
5/3 48/43/46/-7/0.16/0.0/000/00             16 E   AERO 16 E   RMY 17
5/4 48/41/45/-9/0.53/0.0/000/00             33 NE  AERO 35 NE  RMY 34
5/5 44/41/43/-11/0.30/0.0/000/00            39 NNE AERO 41 NNE RMY 39
5/6 54/43/49/-5/0.13/0.0/360/42             28 ENE AERO 29 N   RMY 26
5/7 51/43/47/-8/0.06/0.0/000/00             25 NE  AERO 25 NE  RMY 23
5/8 60/46/53/-2/0.10/0.0/284/33             47 W   AERO 53 W   RMY 49
5/9 65/43/54/-1/0.00/0.0/743/86             40 W   AERO 44 W   RMY 40
5/10 69/40/55/0/0.00/0.0/806/93             22 W   AERO 25 WNW RMY 22
5/11 76/50/63/+7/0.00/0.0/808/93            22 WNW AERO 23 WNW*RMY 22
5/12 75/54/65/+9/0.00/0.0/819/94            23 NNE AERO 25 S   RMY 23
5/13 74/52/63/+7/0.21/0.0/079/09            27 S   AERO 27 S   RMY 26
5/14 78/54/66/+9/0.00/0.0/656/75            35 SSW*AERO 40 SSW RMY 37
5/15 60/41/51/-6/0.00/0.0/588/67            50 W   AERO 54 W   RMY 49
5/16 58/38/48/-9/0.00/0.0/800/91            45 W*  AERO 51 WNW RMY 49
5/17 69/47/58/+1/0.00/0.0/344/39            32 W   AERO 38 W   RMY 38
5/18 64/48/56/-2/0.00/0.0/804/91            24 NE  AERO 26 NNW RMY N/A
5/19 66/49/58/0/0.26/0.0/…/..             23 WNW AERO 26 WNW RMY 25
5/20 73/46/60/+2/0.00/0.0/…/..            20 SSE AERO 22 SSE RMY 21
5/21 74/53/64/+5/0.00/0.0/…/..            21 S   AERO 23 S   RMY 21
5/22 64/53/59/0/T/0.0/…/..                26 ENE AERO 29 ENE RMY 26
5/23 74/51/63/+4/T/0.0/…/..               22 ENE AERO 31 ENE RMY N/A
5/24 56/50/53/-6/0.12/0.0/…/..            30 ENE AERO 31 ENE RMY 29  TSTM
5/25 86/51/69/+9/0.00/0.0/…/..            25 W   AERO 28 W   RMY 25
5/26 86/64/75/+15/0.00/0.0/…/..           21 SE  AERO 23 SE  RMY 21
5/27 81/60/71/+11/0.00/0.0/…/..           26 S   AERO 30 S   RMY 29
5/28 92/63/78/+17/0.00/0.0/…/..           22 SSW AERO 22 SSW RMY N/A
5/29 72/51/62/+1/0.00/0.0/…/..            18 NE  AERO 20 NE  RMY 18
5/30 71/52/62/+1/0.94/0.0/…/..            25 SSW AERO 28 SSW RMY 27
5/31 84/67/76/+15/0.00/0.0/…/..           25 W   AERO 29 WSW RMY 28

6/1 71/54/63/+1/0.00/…/..                 26 NE  AERO 30 NE  RMY N/A
6/2 low temp since midnight is 54F; normal low now 53F

* Last of several occurrences

DAILY RECORDS FOR MAY 2016

5/1/16: DAILY RECORD SNOWFALL OF A TRACE,
TIES PREVIOUS RECORDS SET IN 1905, 1917, 1921, and 1995

5/28/16: DAILY RECORD MAXIMUM TEMP. OF 92F,
PREVIOUS RECORD OF 90F SET IN 1914

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

RECORDS FOR JUNE 2
HIGH 91F IN 1895
LOW 41F IN 1907, 1929
PRECIP 2.36 INS IN 1982
SNOWFALL TRACE IN 1907 (IP)
PEAK GUST 63 MPH NW IN 2000

RECORDS FOR JUNE 3
HIGH 98F IN 1919
LOW 38F IN 1929
PRECIP 2.40 INS 2006
PEAK GUST 47 MPH NW IN 1998

TODAY’S REPORT PREPARED BY: Cece Borries-Strigle / Mike Iacono