Reporting Station : Manassas Municipal, VA
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Sunny. Chilly.
Rise 7:20AM
Set 4:49PM
Waxing gibbous
Rise3:56PM
Set6:45AM
SATURDAY MORNING
IAD / No delays
DECEMBER 14TH, 1924-The temperature at Helena MT plunged 79 degrees in 24 hours, and 88 degrees in 34 hours. The mercury plummeted from 63 above to 25 below zero. At Fairfield MT the temperature plunged 84 degrees in just 12 hours, from 63 at Noon to 21 below zero at midnight.
| DECEMBER 14TH, 1924 |
The temperature at Helena MT plunged 79 degrees in 24 hours, and 88 degrees in 34 hours. The mercury plummeted from 63 above to 25 below zero. At Fairfield MT the temperature plunged 84 degrees in just 12 hours, from 63 at Noon to 21 below zero at midnight. |
| DECEMBER 14TH, 1987 |
A powerful storm spread heavy snow from the Southern High Plains to the Middle Mississippi Valley, and produced severe thunderstorms in the Lower Mississippi Valley. During the evening a tornado hit West Memphis TN killing six persons and injuring two hundred others. The tornado left 1500 persons homeless, and left all of the residents of Crittendon County without electricity. Kansas City MO was blanketed with 10.8 inches of snow, a 24 hour record for December, and snowfall totals in the Oklahoma panhandle ranged up to 14 inches. |
| DECEMBER 13TH, 1915 |
A heavy snowstorm kicked off the snowiest winter in modern records for western New England. |
| DECEMBER 13TH, 1962 |
A severe Florida freeze occurred. Morning lows reached 35 degrees at Miami, 18 degrees at Tampa, and 12 degrees at Jacksonville. It was the coldest December weather of the 20th century and caused millions of dollars damage to crops and foliage. In Georgia, the morning low of 9 degrees below zero at Blairsville established a state record for the month of December. |
| DECEMBER 12TH, 1969 |
The worst tornado of record for western Washington State tracked south of Seattle, traveling five miles, from Des Moines to Kent. The tornado, 50 to 200 yards in width, began as a waterspout over Puget Sound. One person was injured and the tornado caused half a million dollars damage. Portland OR was drenched with 7.66 inches of rain, a record 24 hour total for that location. (12th-13th) |
| DECEMBER 12TH, 1960 |
The first of three Middle Atlantic snowstorms produced a foot of snow at Baltimore MD. A pre-winter blizzard struck the northeastern U.S. producing wind gusts as high as 51 mph, along with 16 inches of snow at Nantucket MA, and 20 inches at Newark NJ. |
| DECEMBER 11TH, 1932 |
Very cold weather prevailed along the West Coast. San Francisco received 0.8 inch of snow, and at the airport the temperature dipped to 20 degrees. At Sacramento CA, the mercury dipped to 17 degrees to establish an all-time record low for that location. Morning lows were below freezing from the 9th to the 15th at Sacramento, and the high on the 11th was just 34 degrees. The cold wave dealt severe damage to truck crops and orange groves in the Sacramento Valley. |
| DECEMBER 11TH, 1989 |
Strong Santa Ana winds developed across southern California and parts of central California. Winds in Kern County of central California gusted to 100 mph near Grapevine. The high winds reduced visibilities to near zero in the desert areas, closing major interstate highways east of Ontario CA. |
| DECEMBER 10TH, 1699 |
A severe ice storm hit Boston MA causing much damage to orchards. |
| DECEMBER 10TH, 1949 |
The barometric pressure at Las Vegas NV reached a record low reading of 29.17 inches (987.8 millibars). |
| DECEMBER 9TH, 1786 |
A second great snowstorm in just five days brought another 15 inches of snow to Morristown NJ, on top of the eight inches which fell on the 7th and 8th, and the 18 inches which fell on the 4th and 5th. The total snowfall for the week was thus 41 inches. New Haven CT received 17 inches of new snow in the storm. Up to four four feet of snow covered the ground in eastern Massachusetts following the storms. |
| Issued By | NWS Field Office | Broadcast Time | Mon, 29 Dec 2014 03:43:00 PST |
| Issuing Time | Mon, 29 Dec 2014 03:43:00 PST | Valid Until | Mon, 29 Dec 2014 03:43:00 PST |
Strong northerly winds are forecast to develop across the San Francisco Bay Area by midday Tuesday and continue through midday Wednesday. A strong..cold and dry storm system will sweep into northern and central California late Monday night and Tuesday morning. This system will generate strong and gusty north to northest winds across the region from midday Tuesday through midday Wednesday.
Rise 7:20AM
Set 4:49PM
Waxing gibbous
Rise3:56PM
Set6:45AM
SATURDAY MORNING
IAD / No delays
| History | |||
| Weather Station: Washington-Dulles International Airport , VA , US | |||
| December Data | Choose another month |
| Averages | |
|
Average High Temperature
4.40 °C
|
Average Low Temperature
-6.10 °C
|
|
Average Mean Temp
-0.60 °C
|
Average Dew Point
-6.10 °C
|
|
Average Windspeed
20.40 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
76.0
|
Average Afternoon Relative Humidity
56.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
7.11
|
|
Average Snowfall (US Only)
20.30
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
*
|
|
Days With Fog
12
|
Days With Snow
4
|
Days With Lows Below Freezing
26
|
Days above 90° F (32.2° C)
0
|
| Records | |
|
Record High
23.90 °C
|
Record Low
-27.80 °C
|
|
Record Wind Speed
100.00 km/h
|
Record Monthly Snowfall
73.6 cm
|
Record 24-hour Snowfall
27.90 cm
|
Record Monthly Rainfall
168 mm
|
Record 24-hour Rainfall
41 mm
|
Record Minimum Monthly Precipitation
1.02 mm
|
| Averages | |
|
Average High Temperature
6.70 °C
|
Average Low Temperature
-5.00 °C
|
|
Average Mean Temp
1.10 °C
|
Average Dew Point
-5.60 °C
|
|
Average Windspeed
20.40 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
77.0
|
Average Afternoon Relative Humidity
52.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
7.11
|
|
Average Snowfall (US Only)
17.80
|
|
| Daily Counts | |
|
Days With Precipitation
9
|
Days With Thunderstorms
*
|
|
Days With Fog
10
|
Days With Snow
3
|
Days With Lows Below Freezing
23
|
Days above 90° F (32.2° C)
0
|
| Records | |
|
Record High
26.10 °C
|
Record Low
-25.60 °C
|
|
Record Wind Speed
85.20 km/h
|
Record Monthly Snowfall
71.1 cm
|
Record 24-hour Snowfall
58.40 cm
|
Record Monthly Rainfall
147 mm
|
Record 24-hour Rainfall
53 mm
|
Record Minimum Monthly Precipitation
0.51 mm
|
| Averages | |
|
Average High Temperature
12.80 °C
|
Average Low Temperature
0.00 °C
|
|
Average Mean Temp
6.70 °C
|
Average Dew Point
-1.10 °C
|
|
Average Windspeed
20.40 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
77.0
|
Average Afternoon Relative Humidity
48.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
7.87
|
|
Average Snowfall (US Only)
7.60
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
1
|
|
Days With Fog
11
|
Days With Snow
2
|
Days With Lows Below Freezing
17
|
Days above 90° F (32.2° C)
0
|
| Records | |
|
Record High
31.70 °C
|
Record Low
-14.40 °C
|
|
Record Wind Speed
98.20 km/h
|
Record Monthly Snowfall
27.9 cm
|
Record 24-hour Snowfall
15.20 cm
|
Record Monthly Rainfall
147 mm
|
Record 24-hour Rainfall
46 mm
|
Record Minimum Monthly Precipitation
2.54 mm
|
| Averages | |
|
Average High Temperature
18.30 °C
|
Average Low Temperature
4.40 °C
|
|
Average Mean Temp
11.70 °C
|
Average Dew Point
3.90 °C
|
|
Average Windspeed
20.40 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
77.0
|
Average Afternoon Relative Humidity
46.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
7.87
|
|
Average Snowfall (US Only)
*
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
2
|
|
Days With Fog
11
|
Days With Snow
*
|
Days With Lows Below Freezing
6
|
Days above 90° F (32.2° C)
*
|
| Records | |
|
Record High
33.30 °C
|
Record Low
-8.30 °C
|
|
Record Wind Speed
109.30 km/h
|
Record Monthly Snowfall
10.2 cm
|
Record 24-hour Snowfall
7.60 cm
|
Record Monthly Rainfall
185 mm
|
Record 24-hour Rainfall
53 mm
|
Record Minimum Monthly Precipitation
0.76 mm
|
| Averages | |
|
Average High Temperature
23.30 °C
|
Average Low Temperature
10.00 °C
|
|
Average Mean Temp
17.20 °C
|
Average Dew Point
10.60 °C
|
|
Average Windspeed
13.00 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
82.0
|
Average Afternoon Relative Humidity
53.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
10.15
|
|
Average Snowfall (US Only)
*
|
|
| Daily Counts | |
|
Days With Precipitation
12
|
Days With Thunderstorms
4
|
|
Days With Fog
15
|
Days With Snow
0
|
Days With Lows Below Freezing
*
|
Days above 90° F (32.2° C)
1
|
| Records | |
|
Record High
36.10 °C
|
Record Low
-2.20 °C
|
|
Record Wind Speed
85.20 km/h
|
Record Monthly Snowfall
* cm
|
Record 24-hour Snowfall
* cm
|
Record Monthly Rainfall
261 mm
|
Record 24-hour Rainfall
79 mm
|
Record Minimum Monthly Precipitation
2.03 mm
|
| Averages | |
|
Average High Temperature
28.30 °C
|
Average Low Temperature
15.00 °C
|
|
Average Mean Temp
21.70 °C
|
Average Dew Point
16.10 °C
|
|
Average Windspeed
11.10 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
84.0
|
Average Afternoon Relative Humidity
54.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
9.90
|
|
Average Snowfall (US Only)
0.00
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
6
|
|
Days With Fog
16
|
Days With Snow
0
|
Days With Lows Below Freezing
0
|
Days above 90° F (32.2° C)
5
|
| Records | |
|
Record High
37.80 °C
|
Record Low
2.20 °C
|
|
Record Wind Speed
118.50 km/h
|
Record Monthly Snowfall
0.0 cm
|
Record 24-hour Snowfall
0.00 cm
|
Record Monthly Rainfall
462 mm
|
Record 24-hour Rainfall
279 mm
|
Record Minimum Monthly Precipitation
1.27 mm
|
| Averages | |
|
Average High Temperature
30.60 °C
|
Average Low Temperature
17.80 °C
|
|
Average Mean Temp
24.40 °C
|
Average Dew Point
18.30 °C
|
|
Average Windspeed
11.10 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
85.0
|
Average Afternoon Relative Humidity
54.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
8.88
|
|
Average Snowfall (US Only)
0.00
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
6
|
|
Days With Fog
19
|
Days With Snow
0
|
Days With Lows Below Freezing
0
|
Days above 90° F (32.2° C)
11
|
| Records | |
|
Record High
40.00 °C
|
Record Low
5.00 °C
|
|
Record Wind Speed
125.90 km/h
|
Record Monthly Snowfall
0.0 cm
|
Record 24-hour Snowfall
0.00 cm
|
Record Monthly Rainfall
180 mm
|
Record 24-hour Rainfall
66 mm
|
Record Minimum Monthly Precipitation
2.28 mm
|
| Averages | |
|
Average High Temperature
30.00 °C
|
Average Low Temperature
17.20 °C
|
|
Average Mean Temp
23.30 °C
|
Average Dew Point
17.80 °C
|
|
Average Windspeed
11.10 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
88.0
|
Average Afternoon Relative Humidity
55.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
10.15
|
|
Average Snowfall (US Only)
0.00
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
5
|
|
Days With Fog
21
|
Days With Snow
0
|
Days With Lows Below Freezing
0
|
Days above 90° F (32.2° C)
8
|
| Records | |
|
Record High
40.00 °C
|
Record Low
3.30 °C
|
|
Record Wind Speed
109.30 km/h
|
Record Monthly Snowfall
0.0 cm
|
Record 24-hour Snowfall
0.00 cm
|
Record Monthly Rainfall
272 mm
|
Record 24-hour Rainfall
119 mm
|
Record Minimum Monthly Precipitation
2.03 mm
|
| Averages | |
|
Average High Temperature
26.10 °C
|
Average Low Temperature
12.80 °C
|
|
Average Mean Temp
19.40 °C
|
Average Dew Point
14.40 °C
|
|
Average Windspeed
11.10 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
89.0
|
Average Afternoon Relative Humidity
55.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
8.63
|
|
Average Snowfall (US Only)
0.00
|
|
| Daily Counts | |
|
Days With Precipitation
8
|
Days With Thunderstorms
2
|
|
Days With Fog
19
|
Days With Snow
0
|
Days With Lows Below Freezing
*
|
Days above 90° F (32.2° C)
3
|
| Records | |
|
Record High
37.20 °C
|
Record Low
-1.10 °C
|
|
Record Wind Speed
87.00 km/h
|
Record Monthly Snowfall
0.0 cm
|
Record 24-hour Snowfall
0.00 cm
|
Record Monthly Rainfall
287 mm
|
Record 24-hour Rainfall
140 mm
|
Record Minimum Monthly Precipitation
1.52 mm
|
| Averages | |
|
Average High Temperature
20.00 °C
|
Average Low Temperature
5.60 °C
|
|
Average Mean Temp
12.80 °C
|
Average Dew Point
7.20 °C
|
|
Average Windspeed
11.10 km/h
|
Average Wind Direction
180.0
|
|
Average Morning Relative Humidity
88.0
|
Average Afternoon Relative Humidity
52.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
8.38
|
|
Average Snowfall (US Only)
*
|
|
| Daily Counts | |
|
Days With Precipitation
8
|
Days With Thunderstorms
1
|
|
Days With Fog
15
|
Days With Snow
*
|
Days With Lows Below Freezing
5
|
Days above 90° F (32.2° C)
*
|
| Records | |
|
Record High
32.20 °C
|
Record Low
-9.40 °C
|
|
Record Wind Speed
83.30 km/h
|
Record Monthly Snowfall
2.5 cm
|
Record 24-hour Snowfall
2.50 cm
|
Record Monthly Rainfall
234 mm
|
Record 24-hour Rainfall
104 mm
|
Record Minimum Monthly Precipitation
* mm
|
| Averages | |
|
Average High Temperature
13.90 °C
|
Average Low Temperature
1.10 °C
|
|
Average Mean Temp
7.80 °C
|
Average Dew Point
1.70 °C
|
|
Average Windspeed
18.50 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
83.0
|
Average Afternoon Relative Humidity
54.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
8.12
|
|
Average Snowfall (US Only)
2.50
|
|
| Daily Counts | |
|
Days With Precipitation
9
|
Days With Thunderstorms
1
|
|
Days With Fog
12
|
Days With Snow
1
|
Days With Lows Below Freezing
15
|
Days above 90° F (32.2° C)
0
|
| Records | |
|
Record High
28.90 °C
|
Record Low
-12.80 °C
|
|
Record Wind Speed
85.20 km/h
|
Record Monthly Snowfall
27.9 cm
|
Record 24-hour Snowfall
27.90 cm
|
Record Monthly Rainfall
198 mm
|
Record 24-hour Rainfall
61 mm
|
Record Minimum Monthly Precipitation
0.51 mm
|
| Averages | |
|
Average High Temperature
7.20 °C
|
Average Low Temperature
-3.30 °C
|
|
Average Mean Temp
2.20 °C
|
Average Dew Point
-3.30 °C
|
|
Average Windspeed
20.40 km/h
|
Average Wind Direction
315.0
|
|
Average Morning Relative Humidity
78.0
|
Average Afternoon Relative Humidity
57.0
|
|
Typical Sky Cover
OVR
|
Average Precipitation (US Only)
8.12
|
|
Average Snowfall (US Only)
10.20
|
|
| Daily Counts | |
|
Days With Precipitation
10
|
Days With Thunderstorms
*
|
|
Days With Fog
12
|
Days With Snow
2
|
Days With Lows Below Freezing
24
|
Days above 90° F (32.2° C)
0
|
| Records | |
|
Record High
25.60 °C
|
Record Low
-20.00 °C
|
|
Record Wind Speed
100.00 km/h
|
Record Monthly Snowfall
60.9 cm
|
Record 24-hour Snowfall
27.90 cm
|
Record Monthly Rainfall
170 mm
|
Record 24-hour Rainfall
74 mm
|
Record Minimum Monthly Precipitation
1.02 mm
|
Rise 7:20AM
Set 4:49PM
Waxing gibbous
Rise3:56PM
Set6:45AM
SATURDAY MORNING
IAD / No delays
| Day | Reason | Upper Soil Moisture | Lower Soil Moisture | |
| Saturday |  |
Fire danger very low | 29% | 31% |
| Sunday | |
Fire danger very low | 29% | 31% |
| Monday | |
Fire danger very low | 29% | 31% |
| Tuesday | |
Fire danger very low | 29% | 31% |
| Wednesday | |
Fire danger very low | 29% | 31% |
| Thursday | |
Fire danger very low | 29% | 31% |
Rise 7:20AM
Set 4:49PM
Waxing gibbous
Rise3:56PM
Set6:45AM
SATURDAY MORNING
IAD / No delays
Rise 7:20AM
Set 4:49PM
Waxing gibbous
Rise3:56PM
Set6:45AM
SATURDAY MORNING
IAD / No delays
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