Saturday, April 8, 2023

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

SATURDAY, APRIL 8, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0515E
SUNSET:  1818E

BEAUTIFUL DAY WITH HIGH PRESSURE AND LOW HUMIDITY…

Today has been exceptionally sunny with excellent visibilty of
at least 70 miles all day. It was cooler today than it has been
with a high so far of 48F before the 1 o’clock EST observation.
There have been passing high level clouds throughout the day,
but skies have been mostly clear. Today has been less windy than
yesterday with a peak gust so far of 26 miles per hour early this
morning.

————————————————————–

PRELIMINARY STATS FOR MARCH 2023

TEMPERATURE, Deg. F
Avg. Max. 46.2 [+2.1] Avg. Min. 31.1 [+4.2] Mean      38.7 [+3.2] 24-hour corrected mean: 37.9
Max. for month: 59F on the 23rd
Min. for month: 25F on the 5th and 20th

HEATING DEGREE DAYS
Total heating units:    812 [-103] Total for the season:  4532 [-815] Total for last season: 4863

COOLING DEGREE DAYS
Total cooling units:      0 [ 000] Total for the season:     0 [ 000] Total for last season:    0

PRECIPITATION, Inches
Total: 5.96 [+0.44] Greatest in 24 hrs: 3.46 on the 13-14th

SNOWFALL, Inches
Total: 10.6 [-4.4] Greatest in 24 hrs: 7.2 on the 14-15th

WIND, mph
Avg. uncorrected wind speed: 12.4 mph
Avg. corrected wind speed:   12.8 mph
Prevailing wind direction:   Northwest [16%] Peak gust and direction:  51 NNE on the 14th

SUNSHINE:
Campbell-Stokes card minutes: 10872 of a possible 21516, or 51%
Astronomical total minutes: 11237 of a possible 22222, or 51%

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cirrostratus NE-SSW
Temperature: 34F; Dew Point: 17F; Relative Humidity: 49%
Wind: NNW @ 8 kts
Sea-level pressure: 1031.8 mb; 30.47 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 34F
6-hr Min temp: 29F
24-hr Precip:  0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 70 318/34/17/3308/047/ FEW CS NE-SSW 8/005 51025
10034 20029

10 A.M.
Weather: Clear, few cirrostratus E-W
Temperature: 41F; Dew Point: 15F; Relative Humidity: 34%
Wind: NW @ 11G19 kts
Sea-level pressure: 1032.0 mb; 30.20 in. Hg: rising then falling
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 70 320/41/15/3111G19/047/ FEW CS E-W 8/005 50002

1 P.M.
Weather: Scattered cirrostratus
Temperature: 46F; Dew Point: 15F; Relative Humidity: 28%
Wind: N 11G16 kts
Sea-level pressure: 1030.4 mb; 30.43 in. Hg: falling unsteadily
Visibility: 70 miles
6-hr Max temp: 48F
6-hr Min temp: 34F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 SCT 70 304/46/15/3511G16/043/ 8/005 57016 10048
20034

————————————————————–

SUMMARY FOR FRIDAY, APRIL 7, 2023

TEMPERATURE (DEGREES F)
MAX…….58   NORMAL…..53
MIN…….36   NORMAL…..35
MEAN……47   NORMAL…..44

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+3
TOTAL DEPARTURE FOR THE MONTH…………………+23 [+3.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………18  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH…………..136  DEPARTURE…….-24
TOTAL HEATING UNITS FOR THE SEASON…………4668  DEPARTURE……-839
TOTAL HEATING UNITS LAST SEASON TO DATE…….5002  DEPARTURE……-334

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

F420C (Official)………..45 WNW @ 1:12 P.M.
VECTOR #1 (1-Sec)……….53 WNW @ 1:06 P.M.
VECTOR #2 (1-Sec)……….55 WNW @ 1:38 P.M.
DAVIS #1……………….47 W   @ 1:06 P.M.
DAVIS #2 ………………47 WNW @ 1:12 P.M.
RMY #1 (Instantaneous)…..52 WNW @ 1:12 P.M.
RMY #2 (Instantaneous)…..52 WNW @ 1:38 P.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……50     @ 1:24 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………36 WNW @ 1:13 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..34 WNW @ 1:18 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..36 WNW @ 1:13 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………37 W   @ 1:18 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………36 WNW @ 1:18 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..32 WNW @ 1:13 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..35 WNW @ 1:13 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………34     @ 1:18 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..16.0 WNW [383 total miles] VECTOR #1………………14.6
VECTOR #2………………16.6
DAVIS #1……………….15.9 WNW
DAVIS #2……………….16.5 NW
RMY #1…………………14.6 WNW
RMY #2…………………16.2 NW
RICHARDS (C5C)………….15.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.00 DEPARTURE…..-0.75
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-0.16

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.2
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-1.3
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-33.3

————————————————————–

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

3/1   43/27/35/+4/0.00/0.0/425/63         20 NW   VEC1 21 SE  RMY 21
3/2   40/34/37/+5/0.31/0.0/000/00         35 NW   VEC1 36 NW  RMY 39
3/3   44/29/37/+5/0.01/0.1/462/68         33 NW   VEC1 34 NW  RMY 36
3/4   33/28/31/-1/0.82/3.3/000/00         48 E    VEC1 49 NE  RMY 52
3/5   41/25/33/+1/0.00/0.0/240/35         35 NW   VEC1 36 NW  RMY 37
3/6   46/31/39/+6/0.00/0.0/571/83         46 WNW  VEC1 48 NW  RMY 51
3/7   38/26/32/-1/T/T/387/56              41 NW   VEC1 42 NW  RMY 46
3/8   44/26/35/+2/T/T/194/28              32 N    VEC1 34 N   RMY 34
3/9   47/32/40/+7/0.00/0.0/473/68         28 NW   VEC1 28 NW  RMY 29
3/10  49/27/38/+4/T/0.0/616/88            18 W    VEC1 18 SE  RMY 17
3/11  36/29/33/-1/0.14/T/000/00           32 NE   VEC1 34 NE  RMY 34
3/12  41/28/35/+1/0.00/0.0/571/81         26 NNE  VEC1 26 NNE RMY 27
3/13  41/32/37/+3/0.52/0.0/000/00         29 E    VEC1 31 E   RMY 33
3/14  39/31/35/0/3.18/6.9/000/00          51 NNE  VEC1 52 NNE RMY 55
3/15  39/30/35/0/0.00/0.0/342/48          46 NNW  VEC1 49 NNW RMY 53
3/16  49/29/39/+4/0.00/0.0/445/62         30 NW   VEC1 31 NW  RMY 34
3/17  52/37/45/+9/T/0.0/036/05            32 S    VEC1 36 S   RMY 36
3/18  52/36/44/+8/0.01/0.0/376/52         30 WNW  VEC1 31 WNW RMY 31
3/19  38/26/32/-4/0.00/0.0/682/94         47 WNW  VEC1 46 WNW RMY 46
3/20  51/25/38/+1/0.00/0.0/706/97         32 WSW  VEC1 34 WSW RMY 35
3/21  58/32/45/+8/0.00/0.0/636/87         33 WNW  VEC1 35 WNW RMY 36
3/22  55/38/47/+10/T/0.0/617/84           24 SSW  VEC1 25 SSW RMY 26
3/23  59/45/52/+14/0.01/0.0/044/06        35 SSW  VEC1 36 SSW RMY 37
3/24  52/36/44/+6/0.00/0.0/311/42         32 WNW  VEC1 33 WNW RMY 33
3/25 39/33/36/-2/0.17/T/015/02 35 ESE  VEC1 38 ESE RMY 37
3/26  57/39/48/+9/T/0.00/597/80           41 WNW  VEC1 44 WNW RMY 46
3/27  58/35/47/+8/0.41/0.0/516/69         18 E    VEC1 21 E   RMY 20
3/28  44/35/40/+1/0.24/T/090/12           17 NW   VEC1 17 NW  RMY 18
3/29  52/29/41/+1/0.00/0.0/725/96         29 SSW  VEC1 31 SSW RMY 31
3/30  41/27/34/-6/T/T/734/97              39 WNW  VEC1 41 WNW RMY 43
3/31  52/26/39/-2/0.11/T/426/56           33 SW   VEC1 35 SW  RMY 38

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

4/1   60/39/50/+9/0.39/0.0/145/19         36 SW   VEC1 40 SW  RMY 41
4/2   50/30/40/-1/0.00/0.0/636/83         40 NNW  VEC1 44 NNW RMY 45
4/3   51/28/40/-2/0.00/0.0/737/96         41 SSW  VEC1 46 SSW RMY 46
4/4   62/40/51/+9/0.00/0.0/594/77         26 ENE  VEC1 26 ENE RMY 27
4/5   45/37/41/-2/0.02/0.0/000/00         33 ENE  VEC1 34 ENE RMY 37
4/6   62/37/50/+7/0.02/0.0/…/..         26 NW   VEC1 28 NNW RMY 29
4/7   58/36/47/+3/0.00/0.0/…/..         45 WNW  VEC1 48 WNW RMY 52

4/8  The low since midnight is 29F, the daily normal low is 35F

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

RECORDS FOR APRIL 8
HIGH 87 IN 1991
LOW 17 IN 1888
PRECIP 1.78 IN. IN 1956
SNOWFALL 9.3 IN. IN 1956
PEAK GUST 70 MPH S IN 2000

RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY: Samantha Richard