Reporting Station : San Francisco International Airport, CA

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MAY 18TH, 1980-Mount Saint Helens (in Washington State) erupted spewing ash and smoke sixty-three thousand feet into the air. Heavy ash covered the ground to the immediate northwest, and small particles were carried to the Atlantic coast.

Previously
MAY 18TH, 1980 Mount Saint Helens (in Washington State) erupted spewing ash and smoke sixty-three thousand feet into the air. Heavy ash covered the ground to the immediate northwest, and small particles were carried to the Atlantic coast.
 
MAY 18TH, 1825 A tornado (said to have crossed all of the state of Ohio) smashed into the log cabin settlement of Burlington, northeast of Columbus.
 
MAY 17TH, 1883 A three day flood in the Black Hills of western South Dakota resulted in a million dollars damage at Rapid City.
 
MAY 17TH, 1979 A reading of 12 degrees at Mauna Kea Observatory established an all-time record low for the state of Hawaii.
 
MAY 16TH, 1952 High winds in the Wasatch Canyon of Utah struck Ogden and Brigham City. Winds at Hill Air Force Base gusted to 92 mph.
 
MAY 16TH, 1874 The Mill Creek disaster occurred west of Northhampton MA. Dam slippage resulted in a flash flood which claimed 143 lives, and caused a million dollars property damage.
 
MAY 15TH, 1834 The Northern Atlantic Coast States were in the midst of their greatest May snowstorm of record. The hills around Newbury VT were covered with two to three feet of snow.
 
MAY 15TH, 1972 The worst ice jam flooding of memory for long-time residents took place along the Kuskokwim River and Yukon River in Alaska. It was the first time since 1890 that the two rivers "flowed as one". The towns of Oscarville and Napaskiak were completely inundated.
 
MAY 14TH, 1896 The mercury plunged to 10 degrees below zero at Climax CO. It was the lowest reading of record for the U.S. during the month of May.
 
MAY 14TH, 1898 A severe thunderstorm, with some hailstones up to 9.5 inches in circumference, pounded a four mile wide path across Kansas City MO. South-facing windows were broken in nearly every house in central and eastern parts of the city, and several persons were injured. An even larger hailstone was thought to have been found, but it turned out to be a chunk of ice tossed out the window of a building by a prankster.
 
MAY 13TH, 1930 A man was killed when caught in an open field during a hailstorm northwest of Lubbock TX.
 
Wind Advisory
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.

History
Weather Station: San Francisco , CA , US
May Data Choose another month
Averages
Average High Temperature
13.30 °C
Average Low Temperature
7.80 °C
Average Mean Temp
10.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
10.41
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
11
Days With Thunderstorms
*
Days With Fog
*
Days With Snow
0
Days With Lows Below Freezing
15
Days above 90° F (32.2° C)
0
Records
Record High
26.10 °C
Record Low
-1.10 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
272 mm
Record 24-hour Rainfall
81 mm
Record Minimum Monthly Precipitation
1.27 mm
Averages
Average High Temperature
15.60 °C
Average Low Temperature
8.90 °C
Average Mean Temp
12.20 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
8.88
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
1
Days With Fog
1
Days With Snow
0
Days With Lows Below Freezing
7
Days above 90° F (32.2° C)
0
Records
Record High
27.20 °C
Record Low
-0.60 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
256 mm
Record 24-hour Rainfall
53 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
16.10 °C
Average Low Temperature
9.40 °C
Average Mean Temp
12.80 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
7.36
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
4
Days above 90° F (32.2° C)
0
Records
Record High
28.90 °C
Record Low
1.70 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
* cm
Record 24-hour Snowfall
* cm
Record Monthly Rainfall
228 mm
Record 24-hour Rainfall
63 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.20 °C
Average Low Temperature
10.00 °C
Average Mean Temp
13.30 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
3.81
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
6
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
2
Days above 90° F (32.2° C)
*
Records
Record High
34.40 °C
Record Low
4.40 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
140 mm
Record 24-hour Rainfall
51 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.80 °C
Average Low Temperature
10.60 °C
Average Mean Temp
14.40 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
1.27
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
3
Days With Thunderstorms
0
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
*
Days above 90° F (32.2° C)
*
Records
Record High
35.60 °C
Record Low
6.70 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
102 mm
Record 24-hour Rainfall
36 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
11.70 °C
Average Mean Temp
15.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
0.51
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
38.30 °C
Record Low
8.30 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
36 mm
Record 24-hour Rainfall
33 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
12.20 °C
Average Mean Temp
15.60 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
*
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
39.40 °C
Record Low
8.30 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
5 mm
Record 24-hour Rainfall
3 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
18.90 °C
Average Low Temperature
12.20 °C
Average Mean Temp
16.10 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
*
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
*
Records
Record High
35.60 °C
Record Low
8.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
13 mm
Record 24-hour Rainfall
13 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
21.10 °C
Average Low Temperature
13.30 °C
Average Mean Temp
17.20 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
0.51
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
1
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
0
Days above 90° F (32.2° C)
1
Records
Record High
38.30 °C
Record Low
8.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
53 mm
Record 24-hour Rainfall
51 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
20.60 °C
Average Low Temperature
12.80 °C
Average Mean Temp
16.70 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
2.79
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
4
Days With Thunderstorms
1
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
*
Days above 90° F (32.2° C)
*
Records
Record High
38.90 °C
Record Low
6.10 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
140 mm
Record 24-hour Rainfall
58 mm
Record Minimum Monthly Precipitation
* mm
Averages
Average High Temperature
17.80 °C
Average Low Temperature
10.60 °C
Average Mean Temp
14.40 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
6.60
Average Snowfall (US Only)
0.00
Daily Counts
Days With Precipitation
8
Days With Thunderstorms
*
Days With Fog
0
Days With Snow
0
Days With Lows Below Freezing
1
Days above 90° F (32.2° C)
0
Records
Record High
30.00 °C
Record Low
3.90 °C
Record Wind Speed
-183.30 km/h
Record Monthly Snowfall
0.0 cm
Record 24-hour Snowfall
0.00 cm
Record Monthly Rainfall
208 mm
Record 24-hour Rainfall
63 mm
Record Minimum Monthly Precipitation
0.00 mm
Averages
Average High Temperature
13.90 °C
Average Low Temperature
8.30 °C
Average Mean Temp
11.10 °C
Average Dew Point
* °C
Average Windspeed
* km/h
Average Wind Direction
*
Average Morning Relative Humidity
*
Average Afternoon Relative Humidity
*
Typical Sky Cover
*
Average Precipitation (US Only)
9.90
Average Snowfall (US Only)
*
Daily Counts
Days With Precipitation
10
Days With Thunderstorms
0
Days With Fog
0
Days With Snow
*
Days With Lows Below Freezing
11
Days above 90° F (32.2° C)
0
Records
Record High
24.40 °C
Record Low
-2.80 °C
Record Wind Speed
16.70 km/h
Record Monthly Snowfall
2.5 cm
Record 24-hour Snowfall
2.50 cm
Record Monthly Rainfall
292 mm
Record 24-hour Rainfall
79 mm
Record Minimum Monthly Precipitation
0.00 mm
Day   Reason Upper Soil Moisture Lower Soil Moisture
Thursday cw_fire_high
Fire danger high 19% 27%
Friday cw_fire_high
Fire danger high 19% 27%
Saturday cw_fire_high
Fire danger high 19% 27%
Sunday cw_fire_moderate
Fire danger moderate 19% 27%
Monday cw_fire_moderate
Fire danger moderate 19% 27%
Tuesday cw_fire_moderate
Fire danger moderate 19% 27%
Snow conditions provided by SnoCountry Mountain Reports™

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