Frost dates for Charleroi Lock, Pennsylvania
Half of years have their last spring frost by April 13, but 1 year in 10 still frosts after May 5.
A frost date is really a percentile from 30 years of records at a nearby weather station: in about half of years a frost still comes after the median date. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
How often a frost still comes on or after each date.
- 1 year in 10
- May 5
- 1 year in 5
- April 26
- 3 years in 10
- April 21
- 2 years in 5
- April 17
- Half of years (the median)
- April 13
First fall freeze
How often the first freeze comes on or before each date.
- 1 year in 10
- October 25
- 1 year in 5
- October 29
- 3 years in 10
- November 1
- 2 years in 5
- November 3
- Half of years (the median)
- November 5
- Growing season
- about 205 days
- Hardiness zone nearby
- 6b
- Summer days
- a usual high of about 28 °C83 °F
- Lettuce and spinach run to seed
- June to September, in hot, long days (how we know)
Summer and rain
A growing garden needs about 25 mm1 in of water a week, rain and watering together. Here is what a normal month brings.
Month by month
- January
- high ~4 °C39 °F · low ~-6 °C21 °F · rain ~82 mm3.2 in
- February
- high ~6 °C42 °F · low ~-5 °C22 °F · rain ~70 mm2.7 in
- March
- high ~11 °C51 °F · low ~-2 °C29 °F · rain ~87 mm3.4 in
- April
- high ~18 °C64 °F · low ~4 °C39 °F · rain ~88 mm3.4 in
- May
- high ~23 °C74 °F · low ~10 °C51 °F · rain ~100 mm3.9 in
- June
- high ~27 °C81 °F · low ~15 °C60 °F · rain ~110 mm4.3 in
- July
- high ~29 °C85 °F · low ~18 °C64 °F · rain ~103 mm4.1 in
- August
- high ~29 °C84 °F · low ~17 °C62 °F · rain ~89 mm3.5 in
- September
- high ~25 °C78 °F · low ~13 °C56 °F · rain ~83 mm3.3 in
- October
- high ~19 °C66 °F · low ~7 °C44 °F · rain ~73 mm2.9 in
- November
- high ~12 °C54 °F · low ~1 °C34 °F · rain ~72 mm2.9 in
- December
- high ~6 °C43 °F · low ~-3 °C27 °F · rain ~83 mm3.3 in
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, the Charleroi Lock station (listed by NOAA as Charleroi Lock, USC00361377), at 40.15, -79.90. These are that station’s own records, unshifted. The further your garden is from it, the less exactly they describe your ground. The planner finds the nearest station to your garden and lowers its confidence with distance, so no number is presented as if it were measured in your garden.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a few hundred feet away does not. No table can know that about your garden. A few seasons of your own logged frosts can.
ZIP codes nearest this station
15022, 15062, 15063, 15067, 15313, 15314, 15331, 15332, 15333, 15358, 15366, 15368, 15412, 15417, 15419, 15423, 15427, 15429, 15432, 15433, 15434, 15438, 15442, 15444, 15450, 15466, 15477, 15483.
What can I plant here, and when? ›
Nearby stations
The nearest stations and how their last-frost dates compare. Together they show how frost varies across your area.
- Mckeesport, PA, last frost by May 2
- Washington 3 NE, PA, last frost by April 24
- Lake Lynn, WV, last frost by April 25
- Confluence 1 SW Dam, PA, last frost by April 30
- Schenley Lock, PA, last frost by April 21
- Burton, WV, last frost by May 4
Other stations in Pennsylvania.
- Beaver Falls 1 NE, PA, last frost by April 27
- Johnstown Cambria County Airport, PA, last frost by April 29
- Putneyville 2 SE Dam, PA, last frost by May 10
- Mercer, PA, last frost by May 15
- Prince Gallitzin State Park, PA, last frost by May 10
- Altoona Blair County Airport, PA, last frost by April 23
- Franklin, PA, last frost by May 2
- Philipsburg 2 S, PA, last frost by May 13