Numbers behind the six town pages
The numbers behind the six towns
Housing counts from the Census Bureau's 2024 estimates, thirty years of rain and freeze records from the Somerville airport station, and the one storm that stands out. Each figure names its source.
Homes and what they are worth
Census Reporter's 2024 profiles count housing units with a margin of error. Warren has 5,560, give or take 279. Watchung has 2,470 (171), Green Brook 2,432 (228), Bridgewater 16,975 (388), Bernards 10,646 (355) and Long Hill 2,947 (203).
Median home values run from $930,800 in Warren (give or take $34,744) to $538,500 in Green Brook (give or take $81,881). Watchung is at $882,500 (24,644), Bernards at $814,800 (33,665), Long Hill at $697,100 (34,277) and Bridgewater at $605,500 (14,792). For comparison, Somerset County's median is $552,100, Morris County's is $582,500 and New Jersey's is $454,400.
Where this comes from (6)
- Census Reporter, Warren township, Somerset County, NJ, ACS 2024 5-year profile
- Census Reporter, Watchung borough, Somerset County, NJ, ACS 2024 5-year profile
- Census Reporter, Green Brook township, Somerset County, NJ, ACS 2024 5-year profile
- Census Reporter, Bridgewater township, Somerset County, NJ, ACS 2024 5-year profile
- Census Reporter, Bernards township, Somerset County, NJ, ACS 2024 5-year profile
- Census Reporter, Long Hill township, Morris County, NJ, ACS 2024 5-year profile
Checked 1 Nov 2026
Size and height above the sea
Wikipedia gives land area and elevation for each town. Warren covers 19.57 square miles at 509 feet. Watchung covers 6.02 at 259 feet and Green Brook 4.41 at 246. Bridgewater is the large one at 31.89 square miles and 138 feet, Bernards covers 24.20 at 249 feet and Long Hill 11.80 at 325.
The Somerville airport station that supplies the weather records sits at 105 feet. All six towns are listed higher than the station, Warren by 404 feet.
Rain, month by month
NOAA's 1991 to 2020 monthly normals for Somerville Somerset Airport, in inches: January 3.16, February 2.20, March 3.89, April 3.59, May 3.54, June 4.23, July 4.93, August 5.18, September 3.82, October 3.67, November 3.41 and December 3.87.
The twelve add up to 45.49 inches. No month is dry, and the summer months are the wettest.
Where this comes from (1)
Checked 1 Nov 2026
Cold, counted in days
The low reaches 32°F or lower on about 124 days a year at the station: 27.0 in January, 24.9 in February, 19.2 in March, 16.1 in November and 24.0 in December, with smaller counts in April (7.8), May (0.6) and October (4.5). The high stays at or below 32°F on about 17 days.
January averages 29.9°F, with a mean high of 39.3 and a mean low of 20.6. February averages 32.6, and July averages 74.6 with a mean high of 86.2.
Where this comes from (1)
Checked 1 Nov 2026
The Ida record near these towns
The state weather network's recap of the Ida remnants on 1 and 2 September lists Bernards' Basking Ridge gauge at 2.72 inches in one hour, 4.04 in two, 5.39 in three and 7.26 in six. Long Hill Township is listed at 7.65 inches. Hillsborough, also in Somerset County, is listed at 9.45.
The recap says the Raritan River's crest at Bound Brook came very near the crests of Floyd in 1999 and Irene in 2011. It does not list Warren, Watchung, Green Brook or Bridgewater.
Where this comes from (1)
Checked 1 Nov 2026
What these numbers leave out
None of the sources consulted gave a storm rainfall figure for Warren itself, and none gave a breakdown of homes by year built. The Somerville station is 8.6 miles from the business address, so a street on the ridge may see weather that the airport does not.
Berkeley Heights, which also touches Warren, is left out; its township site could not be read for this work, so nothing was gathered there.
Have these ready
Start with the street address, the room that shows water and a guess at the roof's age, then call (908) 827-6709. Renters can pass their photos to the owner, who arranges roof work.