Photo: Denaliano at English Wikipedia · Public domainJanuary in Halfmoon bites harder than in 86% of U.S. towns
Peak summer warmth arrives in July, with afternoons near 83°. In July, afternoons here are cooler than in 73% of U.S. towns. December has warmed most since 1901–2000, part of a 1.6° rise. The heating season runs November to April: each of those months averages under 50°.
A year in Halfmoon at a glance
Each month’s typical high and low, and what it brings.
What stands out about Halfmoon’s climate
Compared with towns across the U.S., with Halfmoon’s place in New York beside it.
What a year in Halfmoon feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 190 frost-free days a year
In half of years the last 32° night comes by April 19 and the first by October 26. Frost and day counts come from NOAA’s station at Troy L&d, NY, 8 miles from the town’s center, 260 ft lower.
The 2023 USDA map puts Halfmoon’s center in zone 6a: 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 59 inches of snow a winter
Snow, measured at Albany Airport, falls mostly in January. Precipitation (rain plus melted snow) adds up to 42 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 139 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Halfmoon
87% 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 Troy L&d, NY.
Living with Halfmoon’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
190 frost-free days in zone 6a. The last frost comes by Apr 19 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 26.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September. 12 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Halfmoon from natural hazards, river flooding is the largest share (71%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Halfmoon and its neighbors
Stillwater has the coldest January nights next door (14°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Halfmoon’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 |
|---|---|---|---|---|
| Halfmoon, NY | 15° | 83° | 42" | 59" |
| La Porte, IN | 17° | 83° | 40" | 65" |
| Greenville, PA | 18° | 83° | 43" | 62" |
| Niles, MI | 18° | 83° | 40" | 63" |
| Ontario, OH | 17° | 82° | 42" | 49" |
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 Halfmoon averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.3°).
A bigger shift than in 65% 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 Halfmoon compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Halfmoon’s place among New York’s.
Halfmoon weather by month
Highs, lows and precipitation from NOAA’s grid at Halfmoon’s center; snow, wet days and snow on the ground from Albany Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 32° | 15° | 2.7" | 15.6" | 13 | 18 | 12° – 31° |
| February | 35° | 16° | 2.3" | 13.7" | 11 | 16 | 11° – 32° |
| March | 44° | 25° | 2.8" | 12.0" | 12 | 10 | 27° – 45° |
| April | 58° | 35° | 3.3" | 1.6" | 12 | 1 | 40° – 52° |
| May | 70° | 47° | 3.6" | 0.1" | 13 | 0 | 53° – 64° |
| June | 78° | 56° | 4.5" | 0.0" | 12 | 0 | 64° – 72° |
| July | 83° | 61° | 4.4" | 0.0" | 11 | 0 | 67° – 76° |
| August | 81° | 59° | 4.1" | 0.0" | 11 | 0 | 67° – 74° |
| September | 74° | 52° | 4.1" | 0.0" | 10 | 0 | 59° – 67° |
| October | 61° | 41° | 4.0" | 0.3" | 11 | 0 | 46° – 58° |
| November | 48° | 31° | 3.0" | 2.6" | 11 | 2 | 35° – 45° |
| December | 37° | 22° | 3.3" | 13.3" | 13 | 10 | 22° – 41° |
| Year | 58° | 38° | 41.9" | 59.2" | 139 | 57 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 11° to 32°. August is the most reliable, staying within 7°.
Where Halfmoon’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 Halfmoon’s center.
- Snow: Albany Airport.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Troy L&d, NY, 8 miles from the town’s center, 260 ft lower; 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 Halfmoon’s climate
What is the weather like in Halfmoon?
A typical July afternoon reaches 83°, a January night drops to 15°, and about 59 inches of snow falls in a normal winter. Colder January nights than 86% of U.S. towns; cooler July afternoons than 73% of U.S. towns.
How cold does it get in Halfmoon in winter?
January nights average 15°. About 131 nights a year reach 32° or below and 7 reach 0° or below. In the coldest January of the last 30 years the month averaged 12°.
How much snow does Halfmoon get?
About 59 inches in a normal winter at Albany Airport, most of it in January, with snow on the ground about 57 days a year.
How hot does it get in Halfmoon?
July, with a typical high of 83° and a low of 61°. About 13 days a year reach 90° (Troy L&d, NY).
When is the first and last frost in Halfmoon?
In half of years the last spring frost (32°) comes by April 19 and the first fall frost by October 26, about 190 frost-free days, at Troy L&d, NY.
What growing zone is Halfmoon in?
Zone 6a 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 Halfmoon?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Halfmoon getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 65% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Halfmoon.
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.