WhenToBird

Birding spot · Berkshire County, Massachusetts

Birding at Mount Williams Reservoir: What You'll See Each Week

In November, the birds most often reported at Mount Williams Reservoir are Common Merganser (81%), American Crow (76%), and Canada Goose (69%). It is busiest in spring, when 65 species turn up on at least 1 in 20 checklists, and species counts peak in late May (76 species). 135 species have been reported here across 888 complete checklists from 113 birders.

Species by week

020406080Jan 1-7: low data (8 checklists)Jan 8-14: low data (1 checklists)Jan 15-21: low data (1 checklists)Jan 22-31: low data (2 checklists)Feb 1-7: low data (3 checklists)Feb 8-14: low data (2 checklists)Feb 15-21: low data (2 checklists)Feb 22-28: low data (1 checklists)Mar 1-7: low data (3 checklists)Mar 8-14: low data (7 checklists)Mar 15-21: 32 species on 5%+ of 12 checklistsMar 22-31: 34 species on 5%+ of 20 checklistsApr 1-7: 42 species on 5%+ of 12 checklistsApr 8-14: 44 species on 5%+ of 16 checklistsApr 15-21: low data (8 checklists)Apr 22-30: low data (9 checklists)May 1-7: 65 species on 5%+ of 12 checklistsMay 8-14: 57 species on 5%+ of 10 checklistsMay 15-21: 72 species on 5%+ of 10 checklistsMay 22-31: 76 species on 5%+ of 16 checklistsJun 1-7: 61 species on 5%+ of 10 checklistsJun 8-14: 64 species on 5%+ of 11 checklistsJun 15-21: low data (9 checklists)Jun 22-30: 63 species on 5%+ of 10 checklistsJul 1-7: low data (5 checklists)Jul 8-14: low data (3 checklists)Jul 15-21: low data (3 checklists)Jul 22-31: low data (6 checklists)Aug 1-7: 48 species on 5%+ of 15 checklistsAug 8-14: 60 species on 5%+ of 18 checklistsAug 15-21: 53 species on 5%+ of 11 checklistsAug 22-31: 46 species on 5%+ of 35 checklistsSep 1-7: 38 species on 5%+ of 13 checklistsSep 8-14: 46 species on 5%+ of 16 checklistsSep 15-21: 50 species on 5%+ of 13 checklistsSep 22-30: 59 species on 5%+ of 20 checklistsOct 1-7: 49 species on 5%+ of 33 checklistsOct 8-14: 36 species on 5%+ of 42 checklistsOct 15-21: 46 species on 5%+ of 59 checklistsOct 22-31: 42 species on 5%+ of 105 checklistsNov 1-7: 45 species on 5%+ of 79 checklistsNov 8-14: 35 species on 5%+ of 51 checklistsNov 15-21: 35 species on 5%+ of 46 checklistsNov 22-30: 30 species on 5%+ of 53 checklistsDec 1-7: 29 species on 5%+ of 25 checklistsDec 8-14: 32 species on 5%+ of 18 checklistsDec 15-21: low data (8 checklists)Dec 22-31: 31 species on 5%+ of 16 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Number of species reported on at least 5% of complete checklists, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

In November: what to expect

  1. 1Common Merganser81%
  2. 2American Crow76%
  3. 3Canada Goose69%
  4. 4Hooded Merganser62%
  5. 5Black-capped Chickadee55%
  6. 6Blue Jay52%
  7. 7Mallard49%
  8. 8Bufflehead31%
  9. 9American Black Duck30%
  10. 10Ring-necked Duck28%
  11. 11Common Raven24%
  12. 12Pileated Woodpecker23%
  13. 13American Robin21%
  14. 14Common Loon21%
  15. 15American Goldfinch19%

Share of complete checklists at this spot that reported the bird in November. The sparkline is the whole year, with this month highlighted.

Season by season

Winter 31 species

  1. American Crow78%
  2. Black-capped Chickadee64%
  3. Blue Jay45%
  4. Hooded Merganser38%
  5. Common Merganser31%

Spring 65 species

  1. Song Sparrow67%
  2. American Crow61%
  3. Black-capped Chickadee58%
  4. Common Merganser53%
  5. American Robin50%

Summer 64 species

  1. Song Sparrow66%
  2. American Goldfinch62%
  3. American Crow60%
  4. Gray Catbird60%
  5. Blue Jay55%

Fall 43 species

  1. Canada Goose77%
  2. Common Merganser77%
  3. American Crow73%
  4. Blue Jay59%
  5. Mallard56%

Specialties

Birds reported far more often here than across Massachusetts.

Nearby spots

Frequency is the share of complete checklists at this location that listed the bird, 2016–2025. Busy places report more of everything, and the weekly chart counts species on at least 5% of checklists so a few stray reports do not inflate it. How to read it.