Unlock more jurisdiction sub-pages
Subscribe for full sub-page depth, saves, alerts, and exports.
Weather & Climate
Mercersburg, Pennsylvania, United States
Overview
Available climate summaries for Mercersburg. Origins and reference periods are unverified; stored values may include AI estimates. Treat these as estimates until independently verified.
Key Metrics
Annual Avg
10.5°C
Summer Avg
22.3°C
Winter Avg
-1.7°C
Record High
38.1°C
Record Low
-24.1°C
Annual Precipitation
1044.1 mm
Avg Humidity
78%
Summer Humidity
71%
Winter Humidity
86%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 19.5° | -2.9° | -22.6° | 65.7 | 86% | 61 | 29.3 |
| Feb | 23.2° | -1.8° | -24.1° | 63 | 85% | 79 | 35.6 |
| Mar | 25.9° | 3.2° | -17.9° | 78.4 | 81% | 117 | 38 |
| Apr | 30.4° | 9.8° | -6.4° | 88.8 | 77% | 146 | 29.9 |
| May | 34.5° | 15.7° | -3.1° | 111.9 | 78% | 168 | 21.9 |
| Jun | 34.9° | 20.6° | 3.9° | 102.3 | 76% | 182 | 19.4 |
| Jul | 38.1° | 23.4° | 9.4° | 98.6 | 70% | 186 | 15.4 |
| Aug | 37.5° | 22.8° | 8.9° | 88.7 | 68% | 164 | 18.4 |
| Sep | 36.2° | 18.8° | 2.8° | 104.1 | 70% | 129 | 25 |
| Oct | 33.9° | 11.6° | -5.9° | 89.9 | 76% | 98 | 29.6 |
| Nov | 26.3° | 5° | -15.4° | 69.3 | 80% | 68 | 26.8 |
| Dec | 23.4° | -0.4° | -15.2° | 83.4 | 87% | 53 | 29.8 |
Data sources
Estimates and unverified origins
Oyster List climate data - Climate origins are unverified. Available methods include historical APIs and AI estimates; stored rows do not identify the original dataset, reference period, or model for each value. Treat these summaries as estimates until independently verified. Record updated 2026-03-22.
Subscribe to unlock more jurisdiction sub-pages this month.
You can keep discovering Oyster publicly, but full multi-jurisdiction depth, tracking, alerts, and exports are part of paid access.