Photo: Mr. Matté (if there is an issue with this image, contact me using this image's Commons talk page, my Commons user talk page, or my English Wikipedia user talk page; I'll know about it a lot faster) · CC BY-SA 4.0Precipitation in Interlaken tops that of 73% of U.S. towns: 48 inches a year
In January the night’s low is typically 26°. Winters are mild: January nights here are milder than in 65% of U.S. towns. Decade by decade the climate has edged up, 2.3° above 1901–2000. For walks and days out, the stretch from May to June and August to October brings highs of 66–83°.
A year in Interlaken at a glance
Each month’s typical high and low, and what it brings.
What stands out about Interlaken’s climate
Compared with towns across the U.S., with Interlaken’s place in New Jersey beside it.
What a year in Interlaken feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 208 frost-free days a year
In half of years the last 32° night comes by April 9 and the first by November 3. Frost and day counts come from NOAA’s station at Long Branch-oakhurst, NJ, 4 miles from the town’s center, at about the same height.
The 2023 USDA map puts Interlaken’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 7°. 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 48 inches of rain a year
August is the wettest month and February the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Interlaken
85% of the work is heating. Months averaging under 55° run from November 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 Long Branch-oakhurst, NJ.
Living with Interlaken’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
208 frost-free days in zone 7b. The last frost comes by Apr 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 3.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October.
Parks & trails →Of the yearly building losses FEMA expects in Interlaken from natural hazards, river flooding is the largest share (40%); heat waves, cold waves, winter storms and ice storms together are 5%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Interlaken and its neighbors
Every town next door is within a degree of Interlaken in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
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 Interlaken averaged 2.3° warmer than the 1900s. The biggest change is in December (+4.1°).
A bigger shift than in 98% 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 Interlaken compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Interlaken’s place among New Jersey’s.
Interlaken weather by month
Highs, lows and precipitation from NOAA’s grid at Interlaken’s center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 42° | 26° | 3.6" | 26° – 41° |
| February | 44° | 27° | 3.0" | 23° – 41° |
| March | 50° | 33° | 4.4" | 37° – 49° |
| April | 60° | 42° | 3.8" | 47° – 55° |
| May | 70° | 52° | 3.9" | 56° – 65° |
| June | 79° | 61° | 4.1" | 67° – 74° |
| July | 85° | 67° | 4.3" | 72° – 80° |
| August | 83° | 66° | 4.7" | 70° – 78° |
| September | 77° | 60° | 3.9" | 66° – 72° |
| October | 66° | 48° | 4.1" | 53° – 64° |
| November | 55° | 39° | 3.4" | 42° – 51° |
| December | 46° | 31° | 4.3" | 32° – 50° |
| Year | 63° | 46° | 47.5" |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 32° to 50°. September is the most reliable, staying within 6°.
Where Interlaken’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 Interlaken’s center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Long Branch-oakhurst, NJ, 4 miles from the town’s center, at about the same height; 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 Interlaken’s climate
What is the weather like in Interlaken?
A typical July afternoon reaches 85°, a January night drops to 26°. Milder January nights than 65% of U.S. towns; cooler July afternoons than 52% of U.S. towns.
How cold does it get in Interlaken in winter?
January nights average 26°. About 94 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 26°.
How hot does it get in Interlaken?
July, with a typical high of 85° and a low of 67°. About 13 days a year reach 90° (Long Branch-oakhurst, NJ).
When is the first and last frost in Interlaken?
In half of years the last spring frost (32°) comes by April 9 and the first fall frost by November 3, about 208 frost-free days, at Long Branch-oakhurst, NJ.
What growing zone is Interlaken in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 7°.
What is the best time of year to visit Interlaken?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Interlaken getting warmer?
Yes: 1991–2020 averaged 2.3° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 98% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Interlaken.
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.