McLean, United States experiences average highs of 19°C (66°F) and lows of 10°C (50°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have cooled by 0.7°C (1.3°F) across the available records.
McLean, United States Weather & Climate 2026
Monthly climate averages for McLean, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: May–Sep At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.8/10
Best: April, May, June, September, October
UV Index
5
Low
Temperature 19°C / 10°C
Feels Like 18°C / 9°C
Rainy Days 11
Rainfall 98 mm
Sunshine 9 h
Humidity 69%
Wind Speed 16 km/h
Dew Point 9°C
Snow Days 3 days
Frost Days 9 days
Hottest Month
31°C
July
Avg Low22°C
Rain14days
Coldest Month
-1°C
January
Avg High6°C
Rain10days
Driest Month
8days
October
Avg High20°C
Avg Low12°C
Windiest Month
19 km/h
March (Gusts 44)
Worst Time to Visit
Consider avoiding January, February, December due to very cold temperatures.
Sun Position
Sunrise 05:44
Daylight 14.9h
Sunset 20:37
Live conditions—
McLean on the map · live conditions
McLean, United States
- Continent
- Americas
- Country
- United States
- City
- McLean
- Population
- 48.1K
- Elevation
- 87 m
- Coordinates
- 38.93°, -77.18°
Seasonal Breakdown
Spring
Mar–May
Avg High 19°C
Avg Low 9°C
Rain 11 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 30°C
Avg Low 21°C
Rain 12 days/mo
1/3 best months
Autumn
Sep–Nov
Avg High 20°C
Avg Low 12°C
Rain 9 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low 0°C
Rain 10 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 6°C / -1°C . Feb: 10°C / 1°C . Mar: 14°C / 4°C . Apr: 19°C / 9°C . May: 23°C / 14°C . Jun: 29°C / 19°C . Jul: 31°C / 22°C . Aug: 29°C / 21°C . Sep: 26°C / 18°C . Oct: 20°C / 12°C . Nov: 14°C / 5°C . Dec: 8°C / 1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 84 mm. Feb: 89 mm. Mar: 79 mm. Apr: 84 mm. May: 123 mm. Jun: 107 mm. Jul: 145 mm. Aug: 110 mm. Sep: 107 mm. Oct: 77 mm. Nov: 73 mm. Dec: 97 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 67%. Mar: 63%. Apr: 65%. May: 72%. Jun: 67%. Jul: 70%. Aug: 73%. Sep: 73%. Oct: 72%. Nov: 67%. Dec: 70%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 18 km/h . Feb: 18 km/h . Mar: 19 km/h . Apr: 18 km/h . May: 15 km/h . Jun: 14 km/h . Jul: 12 km/h . Aug: 12 km/h . Sep: 13 km/h . Oct: 15 km/h . Nov: 17 km/h . Dec: 16 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 9h. May: 9h. Jun: 11h. Jul: 12h. Aug: 11h. Sep: 9h. Oct: 8h. Nov: 7h. Dec: 6h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 3. Mar: UV 5. Apr: UV 6. May: UV 7. Jun: UV 7. Jul: UV 8. Aug: UV 7. Sep: UV 5. Oct: UV 5. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 4 days. Feb: 4 days. Mar: 2 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 2 days.
Climate Trends
Average highs have cooled by 0.7°C (1.3°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 31°C | Jul · 31°C |
| Coldest month | Jan 2025 · -5°C | Jan · -1°C |
| Wettest month | Jul 2025 · 220 mm | Jul · 145 mm |
| Windiest month | Mar 2025 · 20 km/h | Mar · 19 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April best
Good May best
Excellent June best
Excellent July
Fair August
Good September best
Excellent October best
Excellent November
Fair December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 6°C / -1°C | 2°C / -6°C | 10days (84 mm) Wet | 6.1h Fair | 67% Muggy | 2.7 Moderate | Poor | View Details |
| February | 10°C / 1°C | 6°C / -3°C | 10days (89 mm) Wet | 6.7h Fair | 67% Muggy | 3.4 Moderate | Poor | View Details |
| March | 14°C / 4°C | 11°C / 0°C | 10days (79 mm) Wet | 8.2h Good | 63% Muggy | 5 Moderate | Fair | View Details |
| April best | 19°C / 9°C | 18°C / 6°C | 9days (84 mm) Wet | 9.1h Good | 65% Muggy | 5.9 High | Good | View Details |
| May best | 23°C / 14°C | 24°C / 13°C | 14days (123 mm) Wet | 9.3h Good | 72% Muggy | 6.5 High | Excellent | View Details |
| June best | 29°C / 19°C | 31°C / 20°C | 11days (107 mm) Wet | 11.3h Excellent | 67% Muggy | 7.3 Very High | Excellent | View Details |
| July | 31°C / 22°C | 35°C / 25°C | 14days (145 mm) Wet | 11.7h Excellent | 70% Muggy | 7.5 Very High | Fair | View Details |
| August | 29°C / 21°C | 32°C / 23°C | 12days (110 mm) Wet | 10.5h Excellent | 73% Muggy | 6.9 High | Good | View Details |
| September best | 26°C / 18°C | 28°C / 19°C | 11days (107 mm) Wet | 8.5h Good | 73% Muggy | 5.2 High | Excellent | View Details |
| October best | 20°C / 12°C | 20°C / 11°C | 8days (77 mm) Wet | 7.9h Good | 72% Muggy | 4.5 Moderate | Excellent | View Details |
| November | 14°C / 5°C | 11°C / 2°C | 8days (73 mm) Wet | 7.2h Good | 67% Muggy | 3.1 Moderate | Fair | View Details |
| December | 8°C / 1°C | 5°C / -3°C | 9days (97 mm) Wet | 5.9h Fair | 70% Muggy | 2.3 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit McLean are April, May, June, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for McLean, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in McLean is July, with average daytime highs of 31°C (89°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in McLean is January, with average overnight lows of -1°C (30°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in McLean is July, averaging 145mm of precipitation across 14 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in McLean runs through May, July, August, June, with the heaviest rainfall in May. Based on 10-year averages for McLean.
McLean receives approximately 102 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for McLean.
The least favorable months to visit McLean are January, February, December, primarily due to very cold temperatures. For the best conditions, consider April, May, June, September, October instead.
The annual average UV index in McLean is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in McLean is 69%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, McLean receives snow. Months with snowfall average 3 snow days and 7 cm (3 in) of accumulation, with about 9 frost days during winter.
Average wind speeds in McLean are 16 km/h (10 mph). The windiest month is March with peak winds reaching 19 km/h (12 mph) (gusts up to 44 km/h / 27 mph).
McLean averages 5 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in November.
The annual average dew point in McLean is 9°C (48°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
McLean has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in McLean ranges from 9°C (48°F) to 18°C (64°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit McLean. It earns a climate score of 8.4/10 with Excellent.
For June in McLean, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 29°C (83°F) and 11 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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