Maryland has an average annual temperature of
55.6°F
(across all 27 cities) with approximately
1091 mm of annual precipitation
and average humidity of 76%.
The warmest city is Potomac
with average July highs of 97.7°F,
while Hagerstown
is the coldest with average January lows of 4.8°F.
This page covers 45 years of NASA POWER climate data (1981–2025)
including temperature, rainfall, humidity, wind speed, and solar radiation.
Jul is typically the warmest month across Maryland with average highs around
95.7°F, while
Jan is the coldest with average lows near
8.6°F.
Jul is the wettest month with approximately
109 mm of rainfall on average.
Month
Max Temp
Min Temp
Avg Temp
Rain (mm)
Humidity
Wind (m/s)
Solar (kWh/m²)
Jan
58.1°F
8.6°F
33.4°F
74
83%
2.9
2.00
Feb
60.1°F
12°F
36.1°F
73
82%
3.0
2.90
Mar
70.2°F
19.2°F
44.8°F
93
79%
3.0
3.90
Apr
78.8°F
28.8°F
53.8°F
90
77%
2.8
5.00
May
84.7°F
39.7°F
62.2°F
105
78%
2.3
5.60
Jun
91.6°F
50.2°F
70.9°F
102
73%
2.0
6.20
Jul
95.7°F
59.2°F
77.5°F
109
68%
1.8
6.00
Aug
94.6°F
57°F
75.7°F
99
68%
1.8
5.40
Sep
90.5°F
47.1°F
68.9°F
105
71%
2.1
4.40
Oct
81.7°F
34.3°F
58.1°F
87
75%
2.3
3.30
Nov
71.1°F
24.8°F
48°F
81
79%
2.5
2.30
Dec
61.2°F
15.6°F
38.5°F
87
83%
2.6
1.80
📈 Maryland Yearly Climate Trends
🌡️ Annual Temperature Trend
State-wide avg annual high & low · Last 10 years
📈 Maryland Long-Term Climate Trends (1981–2025)
This chart shows how Maryland's average temperatures have shifted across 45 years.
Use the range buttons to focus on recent decades or view the full historical record.
Data is averaged across all 27 cities in the state.
🌧️ Annual Precipitation Trend
State-wide avg annual precipitation · Last 10 years · mm/year
🔗 Explore Cities in Maryland
Browse detailed weather history, monthly averages, and 45-year climate trends for every city in Maryland.
Salisbury is the wettest city in Maryland with approximately 1126 mm of annual precipitation on average. View Salisbury weather history →
What is the warmest month in Maryland?▼
Jul is the warmest month across Maryland, with state-wide average highs of 95.7°F and average lows of 59.2°F.
How many cities in Maryland have weather data?▼
TownPillar has historical weather data for 27 cities in Maryland, covering 45 years of NASA POWER climate records from 1981 to 2025.
Which month has the most sunshine in Maryland?▼
Jun is the sunniest month across Maryland with an average solar radiation of 6.20 kWh/m²/day state-wide. This solar radiation data from NASA POWER is useful for solar energy planning, agriculture, and understanding seasonal sunshine availability.
Where does this climate data come from?▼
All data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis data. It includes monthly temperature, precipitation, humidity, wind speed, and solar radiation at 0.5° × 0.625° spatial resolution.
📚 Data Source
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources). Data covers 45 years (1981–2025) across 27 cities in Maryland at monthly temporal resolution.