Photo: Luigi Novi · CC BY 4.0Wet weather: 48 inches of rain and melted snow a year in Union City, more than in 73% of U.S. towns
The warmest part of a July day comes in at 86° on average. Winters are mild: January nights here are milder than in 63% of U.S. towns. The latest 30-year average runs 2.2° warmer than 1901–2000’s, with December up the most. Keep the boiler serviced for the months from November to March, which average under 50°.
A year in Union City at a glance
Each month’s typical high and low, and what it brings.
What stands out about Union City’s climate
Compared with towns across the U.S., with Union City’s place in New Jersey beside it.
What a year in Union City feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 236 frost-free days a year
In half of years the last 32° night comes by March 30 and the first by November 20. Frost and day counts come from NOAA’s station at Central Park, 3 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Union City’s center in zone 7b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 9°. 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 28 inches of snow a winter
Snow, measured at Harrison, NJ, is heaviest from January through February, about 8 inches a month. Precipitation (rain plus melted snow) adds up to 48 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 120 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Union City
79% 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 Central Park.
Living with Union City’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
236 frost-free days in zone 7b. The last frost comes by Mar 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 Nov 20.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 1.0 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Union City from natural hazards, river flooding is the largest share (56%); heat waves, cold waves, winter storms and ice storms together are 24%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Union City and its neighbors
Every town next door is within a degree of Union City in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Union City’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 |
|---|---|---|---|---|
| Union City, NJ | 25° | 86° | 48" | 28" |
| Ellicott City, MD | 24° | 87° | 47" | 29" |
| Charleston, WV | 25° | 87° | 46" | 32" |
| Independence, KY | 23° | 86° | 46" | 23" |
| Amelia, OH | 23° | 86° | 46" | 23" |
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 Union City averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 96% 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 Union City compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Union City’s place among New Jersey’s.
Union City weather by month
Highs, lows and precipitation from NOAA’s grid at Union City’s center; snow, wet days and snow on the ground from Harrison, NJ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 40° | 25° | 3.4" | 8.0" | 11 | 8 | 24° – 40° |
| February | 43° | 26° | 2.9" | 8.4" | 10 | 9 | 23° – 41° |
| March | 51° | 33° | 4.2" | 4.7" | 11 | 3 | 37° – 50° |
| April | 62° | 42° | 3.9" | 0.7" | 11 | 0 | 48° – 57° |
| May | 72° | 52° | 3.9" | 0.0" | 12 | 0 | 58° – 67° |
| June | 81° | 62° | 4.4" | 0.0" | 11 | 0 | 68° – 75° |
| July | 86° | 68° | 4.4" | 0.0" | 9 | 0 | 72° – 81° |
| August | 85° | 66° | 4.3" | 0.0" | 10 | 0 | 71° – 79° |
| September | 77° | 59° | 4.2" | 0.0" | 8 | 0 | 66° – 73° |
| October | 66° | 47° | 4.2" | 0.2" | 9 | 0 | 53° – 63° |
| November | 55° | 38° | 3.5" | 0.3" | 9 | 0 | 42° – 52° |
| December | 45° | 30° | 4.3" | 5.9" | 11 | 3 | 30° – 49° |
| Year | 64° | 46° | 47.6" | 28.2" | 120 | 24 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 30° to 49°. June is the most reliable, staying within 7°.
Where Union City’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 Union City’s center.
- Snow: Harrison, NJ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Central Park, 3 miles from the city’s center point, 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 Union City’s climate
What is the weather like in Union City?
A typical July afternoon reaches 86°, a January night drops to 25°, and about 28 inches of snow falls in a normal winter. Milder January nights than 63% of U.S. towns; hotter July afternoons than 58% of U.S. towns.
How cold does it get in Union City in winter?
January nights average 25°. About 67 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 24°.
How much snow does Union City get?
About 28 inches in a normal winter at Harrison, NJ, heaviest from January through February, about 8 inches a month, with snow on the ground about 24 days a year.
How hot does it get in Union City?
July, with a typical high of 86° and a low of 68°. About 17 days a year reach 90° (Central Park).
When is the first and last frost in Union City?
In half of years the last spring frost (32°) comes by March 30 and the first fall frost by November 20, about 236 frost-free days, at Central Park.
What growing zone is Union City in?
Zone 7b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 9°.
What is the best time of year to visit Union City?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Union City getting warmer?
Yes: 1991–2020 averaged 2.2° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 96% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Union City.
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.