A Lyndhurst Roof Year | Cover Lyndhurst Roofing

Where the numbers come from

The table below uses NOAA's 1991-2020 climate normals for the Teterboro Airport station, the closest one in the data used here. Normals are thirty-year averages, so any one January can be colder or milder than the table. The data file carries no snowfall normals, so the table leaves snow out.

The last column pairs each month with a roof note drawn from the pages in the source list.

Twelve months of Teterboro normals, with roof notes

Month	Typical high and low (°F)	Rain (inches)	On the roof
January	39.9 / 25.7	3.28	Coldest month; ice forms at the eaves when the upper roof is above freezing and the edge is below it
February	42.8 / 27.0	2.82	Lows still under freezing; watch ceilings along outside walls for stains after a thaw
March	50.6 / 34.0	4.09	A good month for the first look from the ground
April	62.5 / 43.7	3.97	Gutters and downspouts after winter
May	73.1 / 53.3	3.94	Attic hatch check for damp insulation
June	82.0 / 63.1	4.25	A dry day for photographing every slope from the yard
July	87.0 / 68.9	4.45	Warmest month; look at flat roofs for standing water
August	85.1 / 67.3	4.25	Isaias, 4 August 2020: more than a million NJ customers lost power
September	78.4 / 59.9	4.11	Ida, 1 September 2021: 3.58 inches in an hour at Lyndhurst
October	66.8 / 47.9	3.73	Leaves reach the gutters; Sandy's storm summary is dated 29 October 2012
November	55.5 / 38.3	3.30	Last easy look before the freezes
December	44.9 / 30.8	4.10	Wettest of the three winter months; lows near 31 degrees

Winter: the freeze and the thaw

The University of Minnesota's extension service describes ice dams in one chain: heat escapes the house, the upper roof warms above freezing, snow melts, and the water refreezes at the colder eave. January's normal low of 25.7 degrees against a high of 39.9 gives Lyndhurst days on both sides of that line.

For new roofs, the state's ice-barrier bulletin applies its requirement to places averaging 25 degrees or below in January, and the only New Jersey area it names as meeting that test is Sussex County.

Spring: the first look from the ground

March brings 4.09 inches of rain on average, April 3.97 and May 3.94. Superstorm Sandy prompted the asphalt roofing trade group to advise owners to make the first check from ground level or an upstairs window, using binoculars. That advice works for any season, and spring is when winter's damage first shows.

A stain that appears after a spring downpour and spreads with the next one is worth a call to a roofer.

Summer: heat, downpours and falling limbs

June and August both carry a normal 4.25 inches of rain, July 4.45, with highs of 82.0, 87.0 and 85.1 degrees. Isaias, a tropical storm on 4 August 2020, knocked out electric service for upwards of a million New Jersey customers, a few of them for as long as five days, and the state weather network noted that countless trees came down.

PSE&G's advice for a limb tangled in a wire is to leave it alone and contact the utility. Past storms in the three towns are covered on the storm season page.

Fall: Ida, Sandy and the leaves

September's normal is 4.11 inches. On 1 September 2021 a Lyndhurst gauge logged 3.58 inches in one hour, with 9.02 inches for the storm at North Arlington and 8.72 at Harrison. Sandy's storm summary is dated 29 and 30 October 2012.

Leaves arrive in October and November, and Secaucus runs leaf pickup every Wednesday from 1 September to 31 December. A gutter packed with leaves shows from a window in seconds.

Which row of the table is today?

Match today's date to a row in the table, make the ground-level look the row suggests, and write the date beside any photograph.

When a stain follows a storm or a freeze, the storm damage repair and ice dam damage pages describe what a roofer looks at. Call (551) 209-3947 and say which month's weather you think did it.

From

Checked 1 Nov 2026