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Saturday, October 25, 2025

October 25, 2025

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

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, OCTOBER 25, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0609E SUNSET:  1647E FAIR AND COOL WEATHER WITH A GOOD DEAL OF SUNSHINE…. Today started with clear conditions but by mid to late morning, clouds began to develop due to diurnal heating. Early this afternoon is now featuring mostly cloudy skies with periods of sunshine. Temperatures remain on the cooler side with readings rising from the upper 30s early this morning to the mid 50s by early this afternoon. Dew points were holding steady in the upper 30s during the morning, but have begun to drop off into the low to mid 30s early this afternoon. It was 35F at the 1pm observation, but has dropped further since that time. Either way, with the dry air in place, it’s providing a deep blue sky and clear air which is allowing for excellent visibility, despite the cloud cover. The wind has been fairly steady today out of mainly the northwest. The average speed for the day so far is around 10mph. The peak gust for the day so far is 21mph, which occurred right around 12:15pm. Visibility has been excellent today, holding at around 80 miles throughout the day. The maximum temperature so far today is 55F degrees, which is 3 degrees below the normal high of 58F. The minimum temperature since midnight is 38F degrees, which is 3 degrees below the normal low of 41F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few stratocumulus distant W-N-ESE Temperature: 40F; Dew Point: 38F; Relative Humidity: 93% Wind: WNW @ 7 kts Sea-level pressure: 1026.4 mb; 30.31 in. Hg: rising, then more rapidly Visibility: 80 miles 6-hr Max temp: 41F 6-hr Min temp: 38F 24-hr Precip: 0.00 inches BHO SA 1155 CLR 80 264/40/38/3007/031/ FEW SC DSNT W-N-ESE/ 8/500 53021 10041 20038 10 A.M. Weather: Clear, few stratocumulus distant all quadrants Temperature: 51F; Dew Point: 38F; Relative Humidity: 61% Wind: NW @ 8G16 kts Sea-level pressure: 1027.1 mb; 30.33 in. Hg: rising, then falling Visibility: 80 miles 3-hr Precip: 0.00 inches BHO SA 1455 CLR 80 271/51/38/3208G16/033/ FEW SC DSNT ALQDS/ 8/500 50007 1 P.M. Weather: Broken stratocumulus Temperature: 54 Dew Point: 35F; Relative Humidity: 48% Wind: NW @ 7G16 kts Sea-level pressure: 1027.3 mb; 30.34 in. Hg: rising, then falling Visibility: 80 miles 6-hr Max temp: 55F 6-hr Min temp: 40F 6-hr Precip: 0.00 inches BHO SA 1755 E55 BKN 80 273/54/35/3207G16/034/ VIRGA DSNT NW-NNE/ 8/500 50002 10055 20040 ————————————————————– SUMMARY FOR FRIDAY, OCTOBER 24, 2025 TEMPERATURE (DEGREES F) MAX…….58   NORMAL…..58 MIN…….41   NORMAL…..41 MEAN……50   NORMAL…..50 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………..0 TOTAL DEPARTURE FOR THE MONTH………………………+65 [+2.5 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY…………….15  DEPARTURE……..-1 TOTAL HEATING UNITS FOR THE MONTH……………224  DEPARTURE…….-52 TOTAL HEATING UNITS FOR THE SEASON…………..287  DEPARTURE……-107 TOTAL HEATING UNITS LAST SEASON TO DATE………281  DEPARTURE……..-5 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL COOLING UNITS FOR THE MONTH…………….20  DEPARTURE…….+13 TOTAL COOLING UNITS FOR THE SEASON…………..756  DEPARTURE…….+79 TOTAL COOLING UNITS LAST SEASON TO DATE………761  DEPARTURE……..-5 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)………..20 WNW  @   10:26 P.M. VECTOR #1 (1-Sec)……….20 WNW  @   10:26 P.M. VECTOR #2 (1-Sec)……….20 WNW  @   10:25 P.M. DAVIS #1……………….20 WNW  @   10:27 P.M. DAVIS #2 ………………19 NW   @   11:09 P.M. RMY #1 (Instantaneous)…..19 WNW  @   10:26 P.M. RMY #2 (Instantaneous)…..20 WNW  @   11:06 P.M. MERLIN…………………19 NW RICHARDS (C5C) (Inst)……20 WNW  @   10:26 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………14 WNW  @   10:26 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 WNW  @   10:27 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 WNW  @   10:26 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 WNW  @   10:27 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WNW  @   10:31 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NW   @   11:02 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WNW  @   10:26 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 WNW  @   10:27 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………7.3 WNW [175 total miles] VECTOR #1……………….8.7 VECTOR #2……………….9.5 DAVIS #1………………..9.0 WNW DAVIS #2………………….M RMY #1………………….8.3 WNW RMY #2………………….9.2 WNW RICHARDS (C5C)…………..9.2 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18 TOTAL PRECIPITATION FOR THE MONTH…………..5.53 DEPARTURE…..+1.31 TOTAL PRECIPITATION FOR THE YEAR (2025)…….41.35 DEPARTURE…..-1.54 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/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 10/1  61/49/55/-3/0.00/668/97            30 NE  VEC1 30 NE  RMY 30 10/2  60/43/52/-6/0.00/637/91            28 NE  VEC1 28 NE  RMY 28 10/3  72/46/59/+2/0.00/670/96            23 SW  VEC1 23 SW  RMY 23 10/4  81/53/67/+10/0.00/667/96           18 NNW VEC1 18 NW  RMY 19 10/5  84/62/73/+16/0.00/664/96           18 SSW VEC1 18 SSW RMY 18 10/6  83/59/71/+15/0.00/649/94           25 SSW VEC1 25 SSW RMY 26 10/7  79/59/69/+13/0.00/440/64           35 SSW VEC1 35 SSW RMY 36 10/8  68/49/59/+4/0.80/027/04            33 NW  VEC1 34 SSW RMY 35 TSTM 10/9  55/40/48/-7/0.00/667/98            33 NNW VEC1 35 NNW RMY 35 10/10 61/38/50/-5/0.00/664/98            25 SSW VEC1 26 S   RMY 26 10/11 66/49/58/+4/0.00/243/36            21 SW  VEC1 21 SW  RMY 20 10/12 56/52/54/0/0.91/000/00             50 ENE VEC1 50 ENE RMY 52 10/13 53/50/52/-2/2.14/000/00            51 ENE VEC1 51 ENE RMY 51 10/14 53/50/52/-1/0.49/000/00            36 NE  VEC1 36 NNE RMY 35 10/15 62/44/53/0/T/319/48                33 NNW VEC1 33 NNW RMY 35 10/16 53/39/46/-6/0.00/410/62            35 NW  VEC1 35 NW  RMY 36 10/17 61/41/51/-1/0.00/652/99            26 N   VEC1 26 N   RMY 27 10/18 63/40/52/0/0.00/604/92             17 SSE VEC1 16 NNW RMY 17 10/19 68/50/59/+8/0.00/568/87            28 SSE VEC1 29 SSE RMY 28 10/20 64/51/58/+7/0.75/072/11            40 SSE VEC1 40 SSE RMY 41 10/21 65/47/56/+5/0.00/648/100           28 WSW VEC1 28 WSW RMY 29 10/22 67/51/59/+9/0.44/387/60            32 SW  VEC1 33 SW  RMY 33 10/23 61/45/53/+3/0.00/…/..            29 WSW VEC1 29 WSW RMY 29 10/24 58/41/50/0/0.00/…/..             20 WNW VEC1 20 WNW RMY 19 10/25 The low since midnight is 38F, the daily normal low is 41F. ————————————————————– OCTOBER DAILY RECORDS TO DATE 10/5  HIGH MINIMUM TEMPERATURE OF 62F, TIED THE RECORD FOR THE DATE WITH 1910 10/6  HIGH MAXIMUM TEMPERATURE OF 83F, TIED THE RECORD FOR THE DATE WITH 1990 AND 2007 10/13 PEAK GUST OF 51 MPH ENE, BEAT THE OLD RECORD OF 46e MPH W IN 1950 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR OCTOBER 25 HIGH 81F IN 1963 LOW 26F IN 1922,1939 PRECIP 2.45 INCHES IN 2005 SNOWFALL 1.2 INCHES IN 1960 PEAK GUST 72 MPH ESE IN 1980 RECORDS FOR OCTOBER 26 HIGH 80F IN 1963 LOW 24F IN 1921,1933 PRECIP 2.23 INCHES IN 2021 SNOW 3.0 INCHES IN 1962 WIND 59 MPH SSE IN 1967 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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