Climate Manassas Municipal Automatic Weather Observing / Reporting System Climate data 1999

Data reported by the weather station: 724036 (KHEF)
Latitude: 38.71 | Longitude: -77.51 | Altitude: 59

°F°C
mi/hkm/h

Average climatic values ​​and annual totals

To calculate annual averages, we analyzed data of 364 days (99.73% of year).

If in the average or annual total of some data is missing information of 10 or more days, this is not displayed.

The total rainfall value 0 (zero) may indicate that there has been no such measurement and / or the weather station does not broadcast.

DataValueComputed days
Average annual temperature:13.0°C364
Annual average maximum temperature:20.7°C364
Average annual minimum temperature:6.9°C364
Annual average humidity:63.8%364
Rain or snow precipitation total annual:--
Annual average visibility:14.6 Km359
Annual average wind speed:9.2 km/h364

To calculate the average temperature used 8314 measurements.
To calculate the average wind speed used 8304 measurements.

Total occurrences

Number of days with extraordinary phenomena.

Total days with rain:9
Total days with snow:4
Total days with thunderstorm:36
Total days with fog:45
Total days with tornado or funnel cloud:0
Total days with hail:0

Days of extreme historical values ​​in 1999

The highest temperature recorded was 38°C on 5 July.
The lowest temperature recorded was -14°C on 6 January.
The maximum wind speed recorded was 75.9 km/h on 3 March.

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