Photo: Daniel Case · CC BY-SA 3.0A middle-of-the-road climate: Hamburg is close to most U.S. towns on every count
Deep winter brings January lows near 18°. In January, nights here are colder than in 69% of U.S. towns. Since 1901–2000, the year has warmed by 1.9°, most of all in December. Long walks are most pleasant from May to October, when afternoons reach 63–84°.
A year in Hamburg at a glance
Each month’s typical high and low, and what it brings.
What stands out about Hamburg’s climate
Compared with towns across the U.S., with Hamburg’s place in New Jersey beside it.
What a year in Hamburg feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 163 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 11. Frost and day counts come from NOAA’s station at Sussex 3 Wnw, NJ, 7 miles from the town’s center, 160 ft higher.
The 2023 USDA map puts Hamburg’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −3°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 39 inches of snow a winter
Snow, measured at Sussex 3 Wnw, NJ, falls mostly in January. Precipitation (rain plus melted snow) adds up to 46 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 132 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Hamburg
91% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Sussex 3 Wnw, NJ.
Living with Hamburg’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
163 frost-free days in zone 6b. The last frost comes by Apr 30 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 11.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Hamburg from natural hazards, river flooding is the largest share (56%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Hamburg and its neighbors
Every town next door is within a degree of Hamburg in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Hamburg’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Hamburg, NJ | 18° | 84° | 46" | 39" |
| Wellesley, MA | 18° | 84° | 48" | 46" |
| Indiana, PA | 19° | 83° | 46" | 46" |
| Woonsocket, RI | 18° | 83° | 50" | 42" |
| Kokomo, IN | 18° | 84° | 42" | 34" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Hamburg averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 86% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Hamburg compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Hamburg’s place among New Jersey’s.
Hamburg weather by month
Highs, lows and precipitation from NOAA’s grid at Hamburg’s center; snow, wet days and snow on the ground from Sussex 3 Wnw, NJ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 18° | 3.3" | 11.6" | 11 | 17 | 18° – 35° |
| February | 39° | 20° | 2.6" | 9.9" | 9 | 15 | 16° – 36° |
| March | 47° | 27° | 3.8" | 6.3" | 11 | 9 | 29° – 47° |
| April | 61° | 36° | 3.6" | 1.2" | 12 | 0 | 44° – 53° |
| May | 71° | 47° | 3.7" | 0.0" | 13 | 0 | 54° – 64° |
| June | 79° | 56° | 4.5" | 0.0" | 11 | 0 | 65° – 70° |
| July | 84° | 61° | 4.2" | 0.0" | 12 | 0 | 68° – 76° |
| August | 82° | 59° | 4.4" | 0.0" | 12 | 0 | 67° – 74° |
| September | 75° | 52° | 4.3" | 0.0" | 10 | 0 | 61° – 68° |
| October | 63° | 41° | 4.4" | 0.3" | 11 | 0 | 48° – 58° |
| November | 51° | 32° | 3.3" | 1.4" | 9 | 1 | 37° – 46° |
| December | 41° | 25° | 3.9" | 8.0" | 11 | 10 | 25° – 43° |
| Year | 61° | 39° | 45.9" | 38.7" | 132 | 52 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 16° to 36°. June is the most reliable, staying within 6°.
Where Hamburg’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Hamburg’s center.
- Snow: Sussex 3 Wnw, NJ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Sussex 3 Wnw, NJ, 7 miles from the town’s center, 160 ft higher; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Hamburg’s climate
What is the weather like in Hamburg?
A typical July afternoon reaches 84°, a January night drops to 18°, and about 39 inches of snow falls in a normal winter. Colder January nights than 69% of U.S. towns; cooler July afternoons than 64% of U.S. towns.
How cold does it get in Hamburg in winter?
January nights average 18°. About 146 nights a year reach 32° or below and 5 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Hamburg get?
About 39 inches in a normal winter at Sussex 3 Wnw, NJ, most of it in January, with snow on the ground about 52 days a year.
How hot does it get in Hamburg?
July, with a typical high of 84° and a low of 61°. About 13 days a year reach 90° (Sussex 3 Wnw, NJ).
When is the first and last frost in Hamburg?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 11, about 163 frost-free days, at Sussex 3 Wnw, NJ.
What growing zone is Hamburg in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −3°.
What is the best time of year to visit Hamburg?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Hamburg getting warmer?
Yes: 1991–2020 averaged 1.9° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 86% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Hamburg.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.