Photo: Unknown authorUnknown author · Public domainSummers in Armagh are cooler than in 76% of U.S. towns
Midwinter brings lows of about 19°. Expect the heaviest rain or snow in July and the lightest in February. Precipitation is plentiful here, more than falls on 70% of U.S. towns. Garden planting can start around May 8; autumn frost returns near October 13.
A year in Armagh at a glance
Each month’s typical high and low, and what it brings.
What stands out about Armagh’s climate
Compared with towns across the U.S., with Armagh’s place in Pennsylvania beside it.
What a year in Armagh feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 157 frost-free days a year
In half of years the last 32° night comes by May 8 and the first by October 13. Frost and day counts come from NOAA’s station at Indiana 3 Se, PA, 11 miles from the town’s center, 440 ft lower.
The 2023 USDA map puts Armagh’s center in zone 6b: the coldest night of a typical winter, averaged over 1991–2020, reaches about −5°. 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 46 inches of snow a winter
Snow, measured at Indiana 3 Se, PA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 47 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 167 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Armagh
92% 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 Indiana 3 Se, PA.
Living with Armagh’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
157 frost-free days in zone 6b. The last frost comes by May 8 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 13.
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 Armagh from natural hazards, river flooding is the largest share (76%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Armagh and similar climates
TownRatings has no climate map of the towns around Armagh yet.
Climates most like Armagh’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 |
|---|---|---|---|---|
| Armagh, PA | 19° | 83° | 47" | 46" |
| Cambridge, MA | 20° | 82° | 48" | 49" |
| Griswold, CT | 19° | 83° | 47" | 38" |
| Carmel, NY | 18° | 83° | 48" | 40" |
| Lincoln, RI | 20° | 83° | 50" | 48" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Armagh averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.1°).
A smaller shift than in 85% 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 Armagh compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Armagh’s place among Pennsylvania’s.
Armagh weather by month
Highs, lows and precipitation from NOAA’s grid at Armagh’s center; snow, wet days and snow on the ground from Indiana 3 Se, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 36° | 19° | 3.6" | 13.3" | 17 | 17 | 20° – 36° |
| February | 39° | 21° | 3.1" | 11.8" | 14 | 13 | 17° – 38° |
| March | 48° | 27° | 3.9" | 6.1" | 14 | 7 | 31° – 49° |
| April | 62° | 37° | 4.0" | 1.1" | 15 | 1 | 44° – 55° |
| May | 71° | 47° | 4.3" | 0.0" | 15 | 0 | 53° – 66° |
| June | 79° | 56° | 4.6" | 0.0" | 14 | 0 | 63° – 70° |
| July | 83° | 60° | 4.7" | 0.0" | 14 | 0 | 67° – 75° |
| August | 81° | 58° | 4.1" | 0.0" | 12 | 0 | 66° – 74° |
| September | 74° | 52° | 4.1" | 0.0" | 12 | 0 | 60° – 68° |
| October | 63° | 41° | 3.3" | 0.0" | 13 | 0 | 48° – 58° |
| November | 50° | 31° | 3.5" | 2.7" | 13 | 2 | 35° – 47° |
| December | 40° | 25° | 3.8" | 10.8" | 15 | 10 | 22° – 43° |
| Year | 60° | 39° | 47.0" | 45.8" | 167 | 49 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 22° to 43°. June is the most reliable, staying within 7°.
Where Armagh’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 Armagh’s center.
- Snow: Indiana 3 Se, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Indiana 3 Se, PA, 11 miles from the town’s center, 440 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 Armagh’s climate
What is the weather like in Armagh?
A typical July afternoon reaches 83°, a January night drops to 19°, and about 46 inches of snow falls in a normal winter. Colder January nights than 63% of U.S. towns; cooler July afternoons than 76% of U.S. towns.
How cold does it get in Armagh in winter?
January nights average 19°. About 131 nights a year reach 32° or below and 4 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Armagh get?
About 46 inches in a normal winter at Indiana 3 Se, PA, most of it in January, with snow on the ground about 49 days a year.
How hot does it get in Armagh?
July, with a typical high of 83° and a low of 60°. About 8 days a year reach 90° (Indiana 3 Se, PA).
When is the first and last frost in Armagh?
In half of years the last spring frost (32°) comes by May 8 and the first fall frost by October 13, about 157 frost-free days, at Indiana 3 Se, PA.
What growing zone is Armagh in?
Zone 6b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −5°.
What is the best time of year to visit Armagh?
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 Armagh getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 85% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Armagh.
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.