Tuesday, April 4, 2023

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

TUESDAY, APRIL 4, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0522E
SUNSET:  1813E

MORNING CLOUDS GIVE WAY TO SUNSHINE THIS AFTERNOON, QUITE MILD…

Cloudy skies with thin fog early this morning have transitioned
to mainly sunny skies with hazy conditions. Temperatures warmed
nicely into the low 60s late this morning, but has since dropped
back into the mid 50s thanks to the development of a sea-breeze
early this afternoon. Despite the slightly cooler air, it’s still
quite a nice day here on the hill.

As mentioned, the wind had been quite light this morning with an
average speed of only around 7mph, however it has picked up some
now that it has become onshore.

Visibility has improved from around 15 miles early this morning,
to around 35-40 miles early this afternoon.

The high temperature so far today is 62F, which is 11 degrees
above the normal maximum temperature for today of 51F. The low
since midnight is 40F, which is 7 degrees above our normal
minimum temperature of 33F.

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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 7th

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

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Today’s Observations:

7 A.M.
Weather: Broken altocumulus, thin broken cirrus
Temperature: 45F; Dew Point: 43F; Relative Humidity: 89%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1019.1 mb; 30.09 in. Hg: rising, then more slowly
Visibility: 15 miles, thin fog
6-hr Max temp: 45F
6-hr Min temp: 42F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E90 BKN 250 -BKN 15 191/45/43/2005/009/ THN F ALQDS
WND LGT/ 8/051 51015 10045 20042

10 A.M.
Weather: Broken altocumulus, thin broken cirrus, few small cumulus
distant SE-SSW
Temperature: 57F; Dew Point: 43F; Relative Humidity: 59%
Wind: SSW @ 3 kts, wind light and variable
Sea-level pressure: 1019.3 mb; 30.10 in. Hg: falling, then rising
Visibility: 40 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E110 BKN 250 -BKN 40 193/57/43/2103/010/
FEW SML CU DSNT SE-SSW HAZY WND L/V/ 8/151 53002

1 P.M.
Weather: Scattered cumulus, thin broken cirrus
Temperature: 57F; Dew Point: 39F; Relative Humidity: 51%
Wind: NE @ 11 kts
Sea-level pressure: 1019.1mb; 30.09 in. Hg: falling, then rising
Visibility: 35 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 45F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 65 SCT E250 -BKN 35 191/57/39/0511/009/ HAZY/
8/201 55002 10062 20045

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SUMMARY FOR MONDAY, APRIL 3, 2023

TEMPERATURE (DEGREES F)
MAX…….51   NORMAL…..51
MIN…….28   NORMAL…..33
MEAN……40   NORMAL…..42

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-2
TOTAL DEPARTURE FOR THE MONTH………………….+6 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………25  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH……………65  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE SEASON…………4597  DEPARTURE……-821
TOTAL HEATING UNITS LAST SEASON TO DATE…….4925  DEPARTURE……-328

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

F420C (Official)………..41 SSW @  2:22 P.M.
VECTOR #1 (1-Sec)……….46 SSW @  2:21 P.M.
VECTOR #2 (1-Sec)……….47 SSW @  2:23 P.M.
DAVIS #1……………….52 S   @  2:23 P.M.
DAVIS #2 ………………51 S   @  3:37 P.M.
RMY #1 (Instantaneous)…..46 SSW @  2:21 P.M.
RMY #2 (Instantaneous)…..49 SSW @  2:23 P.M.
MERLIN…………………43 S
RICHARDS (C5C) (Inst)……47     @  2:21 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………33 SSW @  2:23 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..31     @  2:23 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..31     @  2:23 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………30 S   @  2:23 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S   @  2:19 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..31 SSW @  2:23 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..31 SSW @  2:23 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………30     @  2:23 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….14.5 SSW [348 total miles] VECTOR #1……………..14.5
VECTOR #2……………..15.0
DAVIS #1………………14.1 SSW
DAVIS #2………………15.1 SSW
RMY #1………………..14.3 SSW
RMY #2………………..15.3 SSW
RICHARDS (C5C)…………14.0

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.39 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE YEAR…………..15.00 DEPARTURE…..+0.48

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……-0.6
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-32.6

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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/…/..         36 SW   VEC1 40 SW  RMY 41
4/2   50/30/40/-1/0.00/0.0/…/..         40 NNW  VEC1 44 NNW RMY 45
4/3   51/28/40/-2/0.00/0.0/…/..         41 SSW  VEC1 46 SSW RMY 46

4/4  The low since midnight is 40F, the daily normal low is 33F

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

RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963

RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Matt Douglas