Thursday, May 25, 2023

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

THURSDAY, MAY 25, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0414E
SUNSET:  1908E

SPLENDID SPRING WEATHER WITH COOLER AIR UNDER PARTIAL SUNSHINE….

Today has been wonderful with a generally gentle breeze,
cooler temperatures, and clearer air. The wildfire smoke that
has been plaguing our skies in recent days has moved out,
leaving us with blue skies! Fair weather cumulus clouds are
dotting the sky making for a nice mix of sun and clouds.

Temperatures are considerably cooler than yesterday, with
readings only getting into the low to mid 60s today. With a
dew point in the upper 30s, there is a bit of a coolness to the
air. Perfect conditions for a hike or walk, or to be working
outside.

The wind has been on the gentle side, generally averaging around
10mph for the day so far.

Visibility has been quite decent today, holding at around 65
miles as the hazy air has also moved out of the region.

The high temperature so far today is 64F, which is 5 degrees
below the normal high of 69F. The low since midnight is 47F,
which is 4 degrees below the normal low of 51F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered altocumulus/lenticularis
Temperature: 51F; Dew Point: 39F; Relative Humidity: 64%
Wind: N @ 9 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: rising, then more slolwy
Visibility: 65 miles
6-hr Max temp: 51F
6-hr Min temp: 47F
24-hr Precip:  0.04 inches
BHO SA 1155 25 SCT 40 SCT 65 195/51/39/3609/011/ 8/540 51021
70004 10051 20047

10 A.M.
Weather: Broken cumulus
Temperature: 56F; Dew Point: 39F; Relative Humidity: 52%
Wind: NNW @ 7 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: rising, then falling
Visibility: 65 miles
3-hr Precip:  0.00 inches
BHO SA 1455 E40 BKN 65 195/56/39/3407/011/ 8/200 50000

1 P.M.
Weather: Broken cumulus
Temperature: 62F; Dew Point: 38F; Relative Humidity: 40%
Wind: N @ 8 kts
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling, then rising
Visibility: 65 miles
6-hr Max temp: 64F
6-hr Min temp: 51F
6-hr Precip:  0.00 inches
BHO SA 1755 E50 BKN 65 195/62/38/3508/011/ 8/200 55005 10064 20051

————————————————————–

SUMMARY FOR WEDNESDAY, MAY 24, 2023

TEMPERATURE (DEGREES F)
MAX…….75   NORMAL…..69
MIN…….44   NORMAL…..51
MEAN……60   NORMAL…..60

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….0
TOTAL DEPARTURE FOR THE MONTH………………..+25 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….5  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..182  DEPARTURE…….-35
TOTAL HEATING UNITS FOR THE SEASON…………5153  DEPARTURE……-951
TOTAL HEATING UNITS LAST SEASON TO DATE…….5555  DEPARTURE……-402

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………16  DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE SEASON…………..25  DEPARTURE……..+7
TOTAL COOLING UNITS LAST SEASON TO DATE………47  DEPARTURE…….-22

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E35 NW  @  05:46 P.M.
VECTOR #1 (1-Sec)……….36 NW  @  05:46 P.M.
VECTOR #2 (1-Sec)……….36 NNW @  05:43 P.M.
DAVIS #1……………….35 NW  @  05:46 P.M.
DAVIS #2 ………………35 S   @  03:49 P.M.
RMY #1 (Instantaneous)…..38 NW  @  05:46 P.M.
RMY #2 (Instantaneous)…..38 NNW @  06:10 P.M.
MERLIN…………………33 NNW
RICHARDS (C5C) (Inst)……37     @  05:46 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 NNW @  06:27 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23     @  06:12 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25     @  06:12 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 NW  @  05:45 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 N   @  06:12 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 NNW @  06:12 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 NNW @  06:12 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………23     @  06:12 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……… 9.8 SSW [234 total miles] VECTOR #1……………….10.2
VECTOR #2……………….10.5
DAVIS #1……………….. 9.7 SW
DAVIS #2………………..10.5 SW
RMY #1………………….10.0 SSW
RMY #2………………….10.5 SW
RICHARDS (C5C)…………..10.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.04 DEPARTURE…..-0.09
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-0.32
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-0.90

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.8

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

5/1   63/45/54/+1/0.04/0.0/540/64         44 SSE  VEC1 46 SSE RMY 48
5/2   57/43/50/-4/0.22/0.0/144/17         33 S    VEC1 34 S   RMY 35
5/3   55/42/49/-5/0.01/0.0/093/11         25 E    VEC1 25 E   RMY 25
5/4   45/40/43/-11/0.07/0.0/009/01        29 NE   VEC1 29 NE  RMY 29
5/5   59/43/51/-4/0.07/0.0/367/43         18 NE   VEC1 19 NE  RMY 19
5/6   74/43/59/+4/0.00/0.0/847/99         25 NW   VEC1 26 NW  RMY 26
5/7   78/52/65/+10/0.01/0.0/789/92        26 WNW  VEC1 27 W   RMY 28
5/8   74/49/62/+7/0.03/0.0/800/93         32 NW   VEC1 33 NW  RMY 35
5/9   60/45/53/-3/0.00/0.0/819/95         24 NE   VEC1 25 NE  RMY 25
5/10  72/51/62/+6/0.00/0.0/830/96         25 WSW  VEC1 26 WSW RMY 26
5/11  81/53/67/+11/T/0.0/729/84           30 W    VEC1 30 W   RMY 30
5/12  84/57/71/+14/T/0.0/687/79           31 WNW  VEC1 35 WNW RMY 34
5/13  81/58/70/+13/0/0.0/715/82           28 NNW  VEC1 30 NNW RMY 35
5/14  66/47/57/0/0.00/0.0/822/94          28 NNW  VEC1 29 NNW RMY 31
5/15  72/45/59/+2/0.00/0.0/675/77         33 W    VEC1 35 W   RMY 34
5/16  80/55/68/+10/0.00/0.0/500/57        38 SW   VEC1 39 SW  RMY 41
5/17  62/37/50/-8/0.00/0.0/836/95         36 NNW  VEC1 37 NNW RMY 40
5/18  64/34/49/-9/0.00/0.0/847/96         26 SSW  VEC1 28 SSW RMY 28
5/19  68/42/55/-3/0.00/0.0/751/85         36 SSW  VEC1 36 SSW RMY 34
5/20  65/51/58/-1/1.97/0.0/018/02         38 S    VEC1 39 S   RMY 39
5/21  73/55/64/+5/0.09/0.0/533/60         29 SSW  VEC1 30 SSW RMY 31
5/22  59/46/53/-6/0.00/0.0/782/88         36 ENE  VEC1 38 ENE RMY 39
5/23  65/45/55/-4/0.00/0.0/…/..         17 SE   VEC1 18 SE  RMY 18
5/24  75/44/60/0/0.04/0.0/…/..          35 NW   VEC1 36 NW  RMY 38

5/25 The low since midnight is 47F, the daily normal low is 51F

DAILY RECORDS

05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002

05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969

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

RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)

RECORDS FOR MAY 26
HIGH 94F IN 2010
LOW 37F IN 1972,2013
PRECIP 1.73 INS IN 2003
SNOWFALL TRACE IN 1967 (Fell as ice pellets in nor’easter)
PEAK GUST 62 MPH NE IN 1967

TODAY’S REPORT PREPARED BY: Matt Douglas