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Saturday, December 6, 2025

December 6, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, DECEMBER 6, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, DECEMBER 6, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0659E SUNSET:  1612E WARMER BUT STILL WINTRY: OVERCAST SKIES WITH LIGHT SOUTHERLY WINDS…. Yesterday’s arctic air mass has moved on and has been replaced with much more moist air. We have been under mostly overcast conditions all day, with a few breaks in overcast offshore to our ESE-SSW. There has been some snow observed in the area but any precipitation has so far skirted past the observatory as of 1pm today. There were some flakes overhead during the early morning hours but no accumulation was reported. This morning we observed that both Houghton and Ponkapoag ponds were completely frozen. This is the first day of the season where both ponds were 100% frozen. Last winter, the first day that both ponds froze completely was on December 15th, 2024. The last time both ponds were frozen was earlier this year on March 7th. Temperatures have recovered quite a bit since yesterday, though it still feels quite raw out there today. Today’s low so far of 25F was 7 degrees warmer than the average of yesterday, which was 17F. Dew points have also increased significantly, going from negative and single digits yesterday to the upper 20s and lower 30s today. Winds were out of the south-southeast during the early morning hours and have shifted to the south-southwest by late morning. Winds have been light in the 5-10mph range throughout the day. The average speed for the day so far is around 10mph. The peak gust so far is 20mph, which occurred around 9:30am this morning. Visibility has been consistent at around 30 miles throughout the day. Visibility has been impacted today due to higher dew point values and lingering snow showers in the vicinity. The maximum temperature so far today is 37F degrees, which is 6 degrees below the normal high of 43F. The minimum temperature since midnight is 25F degrees, which is 3 degrees below the normal low of 28F. ————————————————————– Today’s Observations: 7 A.M. Weather: Overcast stratocumulus Temperature: 30F; Dew Point: 26F; Relative Humidity: 85% Wind: SSE @ 6 kts, wind light Sea-level pressure: 1014.1 mb; 29.95 in. Hg: falling, then more rapidly Visibility: 30 miles 6-hr Max temp: 30F 6-hr Min temp: 26F 24-hr Precip: Trace 24-hr Snowfall: Trace Snow Depth: Trace BHO SA 1155 E3 OVC 30 141/30/26/1606/995/ WND LGT/ 8/5// 4/000 58005 6000/ 70000 10030 20026 10 A.M. Weather: Overcast stratocumulus, few breaks in overcast ESE-SSW Temperature: 33F; Dew Point: 31F; Relative Humidity: 90% Wind: S @ 9 kts Sea-level pressure: 1013.6 mb; 29.93 in. Hg: rising, then falling Visibility: 30 miles 3-hr Precip: 0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 E5 OVC 30 136/33/31/1709/993/ FEW BINOVC ESE-SSW/ 8/5// 55002 1 P.M. Weather: Overcast stratocumulus, few breaks in overcast ESE-S, virga N-NNE and WSW-W Temperature: 37F; Dew Point: 33F; Relative Humidity: 84% Wind: WSW @ 3 kts, wind light Sea-level pressure: 1011.6 mb; 29.87 in. Hg: falling, then more slowly Visibility: 30 miles, thin fog N-NNE 6-hr Max temp: 37F 6-hr Min temp: 30F 6-hr Precip: 0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: Trace BHO SA 1755 OVC 30 116/37/33/2503/987/ FEW BINOVC ESE-S THN F N-NNE VIRGA N-NNE AND WSW-W WND LGT/ 8/5// 4/000 56020 10037 20030 ————————————————————– SUMMARY FOR FRIDAY, DECEMBER 5, 2025 TEMPERATURE (DEGREES F) MAX…….25   NORMAL…..43 MIN……..8   NORMAL…..28 MEAN……17   NORMAL…..36 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-19 TOTAL DEPARTURE FOR THE MONTH………………………-39 [-8.0 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….48  DEPARTURE…….+19 TOTAL HEATING UNITS FOR THE MONTH……………182  DEPARTURE…….+38 TOTAL HEATING UNITS FOR THE SEASON………….1299  DEPARTURE…….-49 TOTAL HEATING UNITS LAST SEASON TO DATE……..1115  DEPARTURE……+184 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 *=Last of multiple occurrences F420C (Official)………..30 NW   @   02:30 A.M. VECTOR #1 (1-Sec)……….30 NW   @   02:30 A.M. VECTOR #2 (1-Sec)……….31 NW   @   02:24 A.M. DAVIS #1……………….28 NW   @   02:24 A.M. DAVIS #2 ………………29 NNW  @   02:24 A.M. RMY #1 (Instantaneous)…..30 NW   @   02:30 A.M. RMY #2 (Instantaneous)…..33 NW   @   02:24 A.M. MERLIN…………………M RICHARDS (C5C) (Inst)……29 NNW  @   02:26 A.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………19 NW   @   02:24 A.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 NNW  @   12:01 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 NW   @   02:24 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NW   @   02:30 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NNW  @   02:25 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 NW   @   02:30 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NW   @   02:24 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 NNW  @   12:01 A.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………7.4 SSW [178 total miles] VECTOR #1……………….8.2 VECTOR #2……………….8.6 DAVIS #1………………..8.1 WSW DAVIS #2………………..8.1 WSW RMY #1………………….8.1 SW RMY #2………………….8.5 SW RICHARDS (C5C)…………..8.5 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.19 TOTAL PRECIPITATION FOR THE MONTH…………..0.91 DEPARTURE…..+0.02 TOTAL PRECIPITATION FOR THE YEAR (2025)…….45.37 DEPARTURE…..-3.99 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE…..-0.3 TOTAL SNOWFALL FOR THE MONTH………………..0.6 DEPARTURE…..-0.6 TOTAL SNOWFALL FOR THE SEASON (2025-2026)…….0.7 DEPARTURE…..-3.0 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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 12/1  42/27/35/-2/T/0.0/…/..           37 WNW VEC1 37 WNW RMY 38 12/2  36/27/32/-5/0.85/T/…/..          38 N   VEC1 38 NNE RMY 38 12/3  37/27/32/-4/0.06/0.6/…/..        28 NW  VEC1 29 NNW RMY 30 12/4  38/15/27/T/T/…/..                60 NW  VEC1 59 WNW RMY 61 12/5  25/8/17/T/T/…/..                 30 NW  VEC1 30 NW  RMY 30 12/6 The low since midnight is 25F, the daily normal low is 28F. ————————————————————– DECEMBER DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR DECEMBER 6 HIGH 70 IN 2001 LOW 5 IN 1901,1935 PRECIP 2.78 INS. IN 2003 SNOWFALL 17.0 INS. IN 2003 PEAK GUST 74 MPH NW IN 1981 RECORDS FOR DECEMBER 7 HIGH 74 IN 1998 LOW 6 IN 1906 PRECIP 1.67 INS. IN 1953 SNOWFALL 6.3 INS. IN 2003 PEAK GUST 76e SE IN 1976 TODAY’S REPORT PREPARED BY: Amanda Joly
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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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