Best year time to visit Herndon Heights

General weather information about Herndon Heights

Average annual temperature is 14.3 °C

Absolute maximum temperature: 38.9 °C

Absolute minimum temperature: -9.4 °C

Number of sunny days: 180 days

Number of rainy days: 184 days

Number of snow days: 1 day

* Weather data for Herndon Heights United States is based on climate observations for 2026 year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	17.9	23.2	25.9	31.9	32.0	33.5	38.9	34.5	37.0	27.8	24.4	16.7
Average daytime temperature (°C)	9.9	12.3	13.3	22.5	23.6	27.8	32.5	31.1	27.0	21.2	13.6	10.3
Average temperature (°C)	5.3	6.3	7.0	15.2	16.7	21.4	25.8	24.7	21.1	15.0	7.4	5.4
Average night temperature (°C)	1.7	1.7	1.8	9.0	10.4	15.4	20.6	19.5	16.1	9.9	2.5	1.4
Absolute minimum temperature (°C)	-3.7	-9.4	-5.2	0.7	4.8	10.8	17.8	15.3	9.3	4.1	-6.3	-4.2

The best time to visit Herndon Heights during the most sunny months:

The largest precipitation sum in Herndon Heights is at

April — 131(mm)

June — 122(mm)

September — 153(mm)

December — 145(mm)

When is the best time to visit Herndon Heights?

The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Herndon Heights.

What is the weather like in Herndon Heights?

See average temperature, rainfall and daylight hours for Herndon Heights by month in the table above.

How many sunny days does Herndon Heights have?

The monthly weather statistics above show sunshine and rainfall patterns for Herndon Heights throughout the year.