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Will it freeze in Monessen in the next 7 nights?
No overnight lows at or below 32°F are forecast in Monessen during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 47°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
5 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 47°F Above 36°F · Partly Cloudy
- Fri, Nov 6 38°F Above 36°F · Chance Light Rain
- Sat, Nov 7 36°F Frost possible · Chance Light Rain then Mostly Cloudy
- Sun, Nov 8 33°F Frost possible · Partly Cloudy
- Mon, Nov 9 36°F Frost possible · Mostly Clear
- Tue, Nov 10 35°F Frost possible · Mostly Clear
- Wed, Nov 11 34°F Frost possible · Partly Cloudy
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Monessen
The median first fall hard-freeze date (28°F) is November 16, from NOAA’s 1991–2020 Climate Normals at Charleroi Lock 4. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | Apr 11 · Apr 27 · May 16 | Oct 10 · Oct 25 · Nov 5 | 180 days |
| 32°F freeze | Mar 29 · Apr 13 · May 5 | Oct 25 · Nov 5 · Nov 18 | 205 days |
| 28°F hard freeze | Mar 15 · Mar 31 · Apr 14 | Nov 3 · Nov 16 · Dec 3 | 230 days |
Average high temperature by month
1991–2020 normals at Charleroi Lock 4
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Monessen, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Charleroi Lock 4 (station USC00361377, elevation 749 ft), 0.9 mi from Monessen. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Monessen
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Clairton, PA | 9.9 mi | May 2 | Oct 20 |
| Jefferson Hills, PA | 11 mi | Apr 18 | Oct 28 |
| Pleasant Hills, PA | 13 mi | Apr 18 | Oct 28 |
| McKeesport, PA | 13 mi | May 2 | Oct 20 |
| White Oak, PA | 14 mi | May 2 | Oct 20 |
| West Mifflin, PA | 14 mi | Apr 18 | Oct 28 |
| Bethel Park, PA | 14 mi | Apr 18 | Oct 28 |
| Duquesne, PA | 16 mi | Apr 5 | Nov 10 |
| Whitehall, PA | 16 mi | Apr 18 | Oct 28 |
| Brentwood, PA | 16 mi | Apr 18 | Oct 28 |
Frequently asked questions
When is the last frost in Monessen?
On average, the last spring frost (32°F) in Monessen is around April 13. In about 1 year in 10 it comes after May 5, and in 9 years in 10 it comes after March 29.
When is the first frost in Monessen?
The first fall frost (32°F) usually arrives around November 5. There’s a 10% chance of a freeze by October 25 and a 90% chance by November 18.
Can it frost in Monessen after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after April 27.
What growing zone is Monessen?
Monessen is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 15062. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze