Mercer, PA Climate: Temperature by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Mercer's primary NOAA station, MERCER.
The climate verdict for Mercer
Mercer, Pennsylvania has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 49°F. July is the warmest month at 69°F and January the coldest at 26°F.
- 49°F
- yearly average temperature, NOAA normal
- 141 days
- growing season, frost-free days
Mercer: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00365651 · Mercer, PA 49°F mean
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-UNK · SWING-MID · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 49°F
- RANK-COOL #2,333
- PHOTO-FINISH ≈ Victor
- PRCP-UNK Rain n/a
- SWING-MID 44°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 6,444 HDD
- STN-1 USC00365651
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Victor, NY (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every PA station list.
- Mercer (this station) 49°F
- Hot Ritzville, WA 49°F
- Near Victor, NY 49°F
- Near Millbrook, NY 49°F
- Cold Murphy, ID 48°F
Climate Living Index · Mercer
Mercer: 35/100 · grade F
Mercer publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Mercer, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 155 calendar days | 43/100 · D |
| Annual temperature balance | 48.5°F · 19.0° from 67.5°F | 34/100 · F |
| Frost-free season | 141 days/year | 19/100 · F |
Mercer · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Mercer sits across the climate record
Available NOAA 1991–2020 fields for Mercer are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- 34th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Seasonal temperature swing
- 52nd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 35°F (2°C) | 16°F (-9°C) | 26°F (-4°C) | N/A | 27.9 | 0.0 |
| February | 39°F (4°C) | 17°F (-8°C) | 28°F (-2°C) | N/A | 25.8 | 0.0 |
| March | 48°F (9°C) | 25°F (-4°C) | 37°F (3°C) | N/A | 24.7 | 0.0 |
| April | 62°F (17°C) | 34°F (1°C) | 48°F (9°C) | N/A | 14.2 | 0.0 |
| May | 71°F (22°C) | 44°F (7°C) | 58°F (14°C) | N/A | 3.5 | 0.1 |
| June | 79°F (26°C) | 53°F (12°C) | 66°F (19°C) | N/A | 0.4 | 1.3 |
| July | 82°F (28°C) | 56°F (14°C) | 69°F (21°C) | N/A | 0.0 | 2.1 |
| August | 82°F (28°C) | 56°F (13°C) | 69°F (20°C) | N/A | 0.0 | 2.2 |
| September | 75°F (24°C) | 49°F (9°C) | 62°F (17°C) | N/A | 1.1 | 0.3 |
| October | 63°F (17°C) | 38°F (3°C) | 51°F (10°C) | N/A | 11.9 | 0.0 |
| November | 50°F (10°C) | 29°F (-2°C) | 40°F (4°C) | N/A | 21.2 | 0.0 |
| December | 40°F (4°C) | 21°F (-6°C) | 31°F (-1°C) | N/A | 27.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 82°F around July 7, short of 90°F on every date, while 155 dates carry a normal low at or below freezing, the coldest 15°F near January 27.
The freezing stretch
The normal low stays at or below 32°F into April 9, then returns to freezing around November 7, covering 155 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
The widest day
April 25 carries the biggest normal gap between afternoon and dawn, 29°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mercer.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
October 3
50% probability date
Last Spring Freeze
May 15
50% probability date
Growing Season
141 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
6,444
Higher = more heating needed
Cooling Degree Days
465
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside PA closest to Mercer on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (49°F here).
- Decorah, IA 49°F · 0.0°F off
- Fredericktown, OH 49°F · 0.0°F off
- Grosse Pointe Farms, MI 49°F · 0.0°F off
- Lakeville, IN 49°F · 0.0°F off
Data-derived climate profile
How Mercer's climate pattern fits together
heating led · mid swing
Mercer's energy balance leans toward cold weather: 6,444 annual heating degree days against 465 for cooling. Its 43.7°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 141 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and January mark the typical warm and cold ends of the calendar in Mercer's middle-range seasonal profile. The measured spread is 43.7°F. The annual average is 49°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
A moisture-range label is withheld because Mercer's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Mercer's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Mercer, not an official NOAA class or a year-ahead forecast.
Questions about Mercer's climate
How cold does Mercer get in winter? ▼
How much energy does heating and cooling require in Mercer? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mercer's primary station: MERCER (USC00365651). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4248696). Match rule for Mercer: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Mercer comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.