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Sunday, March 23, 2025

March 23, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, MARCH 23, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, MARCH 23, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0542E SUNSET:  1800E CALENDAR SAYS SPRING, MOTHER NATURE SAYS NOT SO FAST…. What a change in the weather from yesterday. After a nice spring feel with readings into the lower 60s, a cold front pushed through the area last evening bringing a sharp change to the air mass with strong cold air advection, which is continuing today. While we are enjoying plenty of bright sunshine today, the temperature and dew point is more akin to late February with even colder wind chill values! Temperatures this morning started in the mid 20s, which is actually below normal for this late in the month. Readings have been slowly rising through the 30s only reaching the low 40s by the time of the 1pm observation. Dew point values are indicative of an arctic air mass with readings in the upper single digits to 10F degrees all day. It is also adding a decided chill to the air as well, especially with the gusty winds. Winds are busy today averaging out of the northwest at around 18mph. The peak gust so far today is 39mph, which occurred right at 7am. Thanks to the very dry air, visibility is excellent, extending up to 70 miles all day. The maximum temperature for today is 41F degrees, which is 5 degrees below the normal high of 46F. The minimum temperature since midnight is 25F degrees, which is 4 degrees below the normal low of 29F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few stratocumulus distant all quadrants, few cirrus distant W-N-ENE Temperature: 27F; Dew Point: 8F; Relative Humidity: 45% Wind: NW @ 16G28 kts, peak wind NW 32mph at 6:52 A.M. Sea-level pressure: 1015.3 mb; 29.98 in. Hg: rising unsteadily Visibility: 70 miles 6-hr Max temp: 31F 6-hr Min temp: 25F 24-hr Precip:  Trace 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 CLR 70 153/27/8/3216G28/998/ FEW SC DSNT ALQDS FEW CI DSNT W-N-ENE PK WND 3228/52/ 8/501 52038 70000 10031 20025 10 A.M. Weather: Clear, few cirrus distant NW-NE-ESE Temperature: 34F; Dew Point: 9F; Relative Humidity: 34% Wind: NW @ 17G26 kts, peak wind WNW 33mph at 9:41 A.M. Sea-level pressure: 1077.7 mb; 30.05 in. Hg: rising, then more slowly Visibility: 70 miles 3-hr Precip:  0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 CLR 70 177/34/9/3117G26/005/ FEW CI DSNT NW-NE-ESE PK WND 3029/41/ 8/001 51024 1 P.M. Weather: Clear, few cirrus distant NNE-NE Temperature: 41F; Dew Point: 10F; Relative Humidity: 27% Wind: NW @ 13G26 kts, peak wind NW 30mph at 12:53 P.M. Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising, then more slowly Visibility: 70 miles 6-hr Max temp: 41F 6-hr Min temp: 27F 6-hr Precip:  0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 CLR 70 182/41/10/3113G26/007/ FEW CI DSNT NNE-NE PK WND 3126/53/ 8/001 51005 10041 20027 ————————————————————– SUMMARY FOR SATURDAY, MARCH 22, 2025 TEMPERATURE (DEGREES F) MAX…….62   NORMAL…..46 MIN…….33   NORMAL…..29 MEAN……48   NORMAL…..37 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+11 TOTAL DEPARTURE FOR THE MONTH……………………+147 [+6.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025) TOTAL HEATING UNITS FOR YESTERDAY…………….17  DEPARTURE…….-11 TOTAL HEATING UNITS FOR THE MONTH……………532  DEPARTURE……-148 TOTAL HEATING UNITS FOR THE SEASON………….4713  DEPARTURE……-399 TOTAL HEATING UNITS LAST SEASON TO DATE……..4421  DEPARTURE……+292 PEAK WIND GUST (MPH): Note: Instruments designated #1 = Main Tower, #2 = South Tower, F420C, Contacting, Merlin, and Richards are all on Main Tower. E=Estimated F420C (Official)………..53 WNW  @   08:22 P.M. VECTOR #1 (1-Sec)……….52 WNW  @   08:22 P.M. VECTOR #2 (1-Sec)……….55 WNW  @   08:20 P.M. DAVIS #1……………….53 WNW  @   08:15 P.M. DAVIS #2 ………………50 NW   @   08:21 P.M. RMY #1 (Instantaneous)…..58 WNW  @   08:22 P.M. RMY #2 (Instantaneous)…..57 WNW  @   08:22 P.M. MERLIN…………………51 NW RICHARDS (C5C) (Inst)…..OTS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………40 NW   @   08:23 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..35      @   08:22 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..39      @   08:22 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………37 WNW  @   08:22 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………38 NW   @   08:22 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..34 WNW  @   08:22 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..37 WNW  @   08:22 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..16.3 WSW [392 total miles] VECTOR #1………………15.9 VECTOR #2………………16.8 DAVIS #1……………….16.3 WSW DAVIS #2……………….16.8 W RMY #1…………………15.3 WSW RMY #2…………………16.6 WSW RICHARDS (C5C)…………..OTS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.19 TOTAL PRECIPITATION FOR THE MONTH…………..3.74 DEPARTURE…..-0.18 TOTAL PRECIPITATION FOR THE YEAR (2025)……..9.39 DEPARTURE…..-3.03 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.5 TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE…..-12.2 TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-30.0 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 3/1    50/21/36/+5/T/T/081/12            46 NW  VEC1 46 NW  RMY 49 3/2    28/14/21/-11/0.00/0.0/672/99      41 NW  VEC1 42 NW  RMY 43 3/3    31/8/20/-12/0.00/0.0/667/98       28 NW  VEC1 28 NW  RMY 31 3/4    48/23/36/+4/0.00/0.0/390/57       41 SW  VEC1 42 SW  RMY 43 3/5    54/41/48/+16/0.52/0.0/021/03      50 SSW VEC1 50 SSW RMY 55 3/6    55/32/44/+11/0.66/T/014/02        69 S   VEC1 69 S   RMY 68 3/7    41/25/33/0/T/T/638/92             60 WNW VEC1 61 WNW RMY 64 3/8    40/27/34/+1/0.00/0.0/619/89       55 W   VEC1 55 W   RMY 58 3/9    45/25/35/+2/0.00/0.0/544/78       40 W   VEC1 39 W   RMY 42 3/10   60/33/47/+13/0.00/0.0/680/97      38 WNW VEC1 38 WNW RMY 39 3/11   62/37/50/+16/0.00/0.0/676/96      39 SSW VEC1 40 SSW RMY 40 3/12   48/32/40/+6/T/T/544/77            29 N   VEC1 29 N   RMY 29 3/13   46/32/39/+5/0.00/0.0/483/68       25 ESE VEC1 26 ESE RMY 25 3/14   54/33/44/+9/0.00/0.0/570/80       22 SSW VEC1 22 SSW RMY 22 3/15   59/37/48/+13/0.00/0.0/358/50      28 S   VEC1 28 S   RMY 28 3/16   67/44/56/+21/0.05/0.0/136/19      56 SSW VEC1 58 SSW RMY 58 3/17   58/38/48/+12/2.12/0.0/000/00      60 SSW VEC1 60 SSW RMY 60 3/18   48/34/41/+5/0.00/0.0/362/50       31 NNW VEC1 31 NNW RMY 32 3/19   52/34/43/+7/0.00/0.0/662/91       18 NE  VEC1 18 NE  RMY 17 3/20   55/36/46/+9/0.03/0.0/…/..       30 S   VEC1 30 S   RMY 30 3/21   46/36/41/+4/0.36/0.0/…/..       48 NW  VEC1 49 NW  RMY 54 3/22   62/33/48/+11/T/0.0/…/..         53 WNW VEC1 52 WNW RMY 58 3/23 The low since midnight is 25F, the daily normal low is 29F. ————————————————————– MARCH DAILY RECORDS TO DATE 3/16 RECORD HIGH MINIMUM TEMP OF 44F; OLD RECORD WAS 43F IN 1921, 1973 3/17 RECORD PRECIPITATION AMOUNT OF 2.12 INS; OLD RECORD WAS 1.97 INS IN 1968 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MARCH 23 HIGH 78 IN 1938 LOW 3 IN 1934 PRE 2.52 INS. IN 2010 SNOW 3.0 INS. IN 1977 WIND 78e MPH W IN 1940 RECORDS FOR MARCH 24 HIGH 70 IN 1920 LOW 6 IN 1906 PRECIP 1.51 INS. IN 1956 SNOWFALL 12.3 INS. IN 1956 PEAK GUST 71 MPH W IN 1968 TODAY’S REPORT PREPARED BY: Matt Douglas
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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