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Tuesday, March 25, 2025

March 25, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, MARCH 25, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, MARCH 25, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0538E SUNSET:  1802E DRIER AND MILDER TODAY FOLLOWING YESTERDAY’S RAINFALL…. The total rainfall from yesterday’s weather system was 0.79″. This brings the monthly total over 4.50″, which for now is a bit above normal. But we’re still holding on to a deficit for the year so far of just over 2.60″. Things have dried out today with partial sunshine, milder temperatures, and a brisk southwesterly wind. Temperatures have reached the low to mid 50s early this afternoon after starting the day in the mid 30s. These readings are a bit above normal for today’s date, and with the higher sun angle, it feels nice out there when the wind drops off a bit. Dew point values have been dropping off with the atmosphere mixing drier air from aloft early this afternoon. Values reached 40 for a time this morning, but have since dropped to the upper 20s. Winds died down for a time this morning, but have increased again into early this afternoon thanks to the above mentioned mixing. The average speed for the day so far is around 10mph. Gusts have been exceeding the 30mph mark early this afternoon. The peak gust so far is 33mph, occurring just after 11:30am. Visibility has been gradually improving since early this morning. We went from seeing only around 20 miles early this morning to around 50 miles by early this afternoon. The maximum temperature for today is 53F degrees, which is 6 degrees above the normal high of 47F. The minimum temperature since midnight is 33F degrees, which is 3 degrees above the normal low of 30F. ————————————————————– Today’s Observations: 7 A.M. Weather: Broken cirrostratus, broken cirrus, few stratus fractus NE-SE, few stratocumulus distant W-WNW, few altocumulus/castellanus distant W-N and distant NE-ESE Temperature: 38F; Dew Point: 38F; Relative Humidity: 99% Wind: SW @ 6 kts, wind light Sea-level pressure: 1011.0 mb; 29.86 in. Hg: rising, then more rapidly Visibility: 20 miles, thin fog 6-hr Max temp: 38F 6-hr Min temp: 33F 24-hr Precip:  0.79 inches 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 E220 BKN 250 BKN 20 110/38/38/2306/986/ FEW STFRA NE-SE FEW SC DSNT W-WNW FEW AC/ACC DSNT W-N AND DSNT NE-ESE THN F ALQDS WND LGT/ 8/787 53012 70079 10038 20033 10 A.M. Weather: Broken cumulus, broken cirrus Temperature: 48F; Dew Point: 31F; Relative Humidity: 51% Wind: WSW @ 11G22 kts Sea-level pressure: 1010.8 mb; 29.85 in. Hg: rising, then falling Visibility: 40 miles, hazy 3-hr Precip:  0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 E44 BKN 250 BKN 40 108/48/31/2511G22/985/ HAZY PK WND 2727/27/ 8/201 58002 1 P.M. Weather: Broken cumulus Temperature: 51F; Dew Point: 28F; Relative Humidity: 40% Wind: W @ 9G19 kts Sea-level pressure: 1009.4 mb; 29.81 in. Hg: falling, then more rapidly Visibility: 50 miles 6-hr Max temp: 53F 6-hr Min temp: 38F 6-hr Precip:  0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 E65 BKN 50 094/51/28/2709G19/981/ 8/200 58014 10053 20038 ————————————————————– SUMMARY FOR MONDAY, MARCH 24, 2025 TEMPERATURE (DEGREES F) MAX…….43   NORMAL…..47 MIN…….31   NORMAL…..29 MEAN……37   NORMAL…..38 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-1 TOTAL DEPARTURE FOR THE MONTH……………………+143 [+5.8 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025) TOTAL HEATING UNITS FOR YESTERDAY…………….28  DEPARTURE……..+1 TOTAL HEATING UNITS FOR THE MONTH……………590  DEPARTURE……-145 TOTAL HEATING UNITS FOR THE SEASON………….4771  DEPARTURE……-396 TOTAL HEATING UNITS LAST SEASON TO DATE……..4482  DEPARTURE……+289 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)………..35 S    @   09:46 A.M. VECTOR #1 (1-Sec)……….35 S    @   09:46 A.M. VECTOR #2 (1-Sec)……….34 S    @   08:54 A.M. DAVIS #1……………….35 S    @   08:54 A.M. DAVIS #2 ………………44 S    @   08:47 A.M. RMY #1 (Instantaneous)…..36 S    @   09:45 A.M. RMY #2 (Instantaneous)…..37 S    @   08:54 A.M. MERLIN…………………33 S RICHARDS (C5C) (Inst)…..OTS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………25 S    @   09:46 A.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @   09:47 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26      @   09:47 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 S    @   09:47 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………30 S    @   08:53 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 S    @   09:47 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 S    @   09:47 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..11.1 SSE [267 total miles] VECTOR #1………………11.3 VECTOR #2………………12.1 DAVIS #1……………….11.1 SSE DAVIS #2……………….11.5 SSE RMY #1…………………11.0 SSE RMY #2…………………12.1 SSE RICHARDS (C5C)…………..OTS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.79 DEPARTURE…..+0.61 TOTAL PRECIPITATION FOR THE MONTH…………..4.53 DEPARTURE…..+0.24 TOTAL PRECIPITATION FOR THE YEAR (2025)…….10.18 DEPARTURE…..-2.61 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.4 TOTAL SNOWFALL FOR THE MONTH………………TRACE DEPARTURE…..-12.9 TOTAL SNOWFALL FOR THE SEASON (2024-2025)……34.1 DEPARTURE…..-30.7 ————————————————————– 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   44/25/35/-3/0.00/0.0/…/..       39 WNW VEC1 39 NW  RMY 40 3/24   43/31/37/-1/0.79/0.0/…/..       35 S   VEC1 35 S   RMY 36 3/25 The low since midnight is 33F, the daily normal low is 30F. ————————————————————– 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 25 HIGH 76 IN 1910 LOW 8 IN 1888, 1956 PRECIP 1.84 INS. IN 1909 SNOWFALL 1.8 INS. IN 2018 PEAK GUST 69 MPH SE IN 1969 RECORDS FOR MARCH 26 HIGH 76 IN 1922, 1949 LOW 6 IN 1960 PRECIP 1.99 INS. IN 1988 SNOWFALL 5.4 INS. IN 2001 PEAK GUST 63 MPH S IN 1970 TODAY’S REPORT PREPARED BY: Matt Douglas/Andrew Sullivan
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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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