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Mercer County
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Mercer County Weather, Climate and Best Time to Visit
Data source：Meteostat
Update date：2025-09
Mercer County year round climate
- Spring (March–May): Average 40–61°F, variable climate, sometimes warm and comfortable, sometimes cold and humid, with heavier rainfall. Common activities: Outdoor walks (be mindful of weather changes), flower viewing. Recommended clothing: Layered clothing, jacket, sweater, long-sleeved shirt.
- Summer (June–August): Average 67–72°F, warm and humid, with the most rainfall in July. Common activities: Picnics, outdoor activities (be mindful of sun protection and rain). Recommended clothing: Breathable short-sleeved clothing, light pants, rain gear.
- Autumn (September–November): Average 53–65°F, comfortable and pleasant climate, rainfall gradually decreases. Common activities: Maple leaf viewing (if maple leaves are present locally), hiking. Recommended clothing: Light jacket, long-sleeved shirt.
- Winter (December–February): Average -34–35°F, cold and dry, low probability of snowfall. Common activities: Indoor activities, skiing (check for nearby suitable ski resorts). Recommended clothing: Thick coat, hat, scarf, gloves.
Mercer County climatological average
Annual average temperature: approx. 51.8°F / Annual rainfall: approx. 994 mm / Summer humidity: 65%–75% / Rainiest month: July
Mercer County monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
29.7°F
100
February
34.7°F
69.7
March
40.6°F
102
April
51.1°F
101
May
61.2°F
95
June
67.8°F
57.3
July
72.5°F
115
August
70.7°F
79.3
September
65.1°F
64
October
53.4°F
59.3
November
43.7°F
83
December
35.6°F
69.3
Mercer County weather for the next seven days
12/17
Wednesday
Cloudy
43.9°F/24.8°F
12/18
Thursday
Patchy rain nearby
43°F/33.3°F
12/19
Friday
Heavy rain
37.8°F/24.8°F
12/20
Saturday
Overcast
39°F/23.4°F
12/21
Sunday
Light freezing rain
31.5°F/23.6°F
12/22
Monday
Partly Cloudy
29.4°F/21.2°F
12/23
Tuesday
Overcast
41.9°F/27.7°F
