Station Overview Station Location
Station Number CA-SM-9 Latitude 37.381892
Station Name Portola Valley 1.3 ENE Longitude -122.197612
County San Mateo Elevation (ft) 531



Month 30 Yr Avg by PRISM Total Prcp Sum Days Covered By All Observations Daily Prcp Sum Daily Observation Count Multiday Prcp Sum Days Covered by Multiday Observations Multiday Observation Count Days With Prcp Days With Trace Total Snowfall Days With Snowfall Days With Snow On Ground
Oct 14 1.19 0.25 21 0.00 9 0.25 12 1 0 1 0.0 0 0
Nov 14 2.99 1.86 22 1.86 18 0.00 4 1 11 0 0.0 0 0
Dec 14 4.80 11.74 25 11.74 23 0.00 2 1 12 3 0.0 0 0
Jan 15 5.34 0.03 21 0.03 21 0.00 0 0 1 1 0.0 0 0
Feb 15 5.03 4.91 24 4.91 18 0.00 6 2 5 3 0.0 0 0
March 15 4.20 0.48 26 0.48 23 0.00 3 1 5 1 0.0 0 0
April 15 1.71 1.90 37 1.90 12 0.00 25 4 4 1 0.0 0 0
May 15 0.63 0.20 35 0.20 2 0.00 33 4 2 0 0.0 0 0
June 15 0.16 0.12 25 0.12 2 0.00 23 3 2 0 0.0 0 0
July 15 0.03 0.00 40 0.00 1 0.00 39 2 0 1 0.0 0 0
Aug 15 0.04 0.00 24 0.00 0 0.00 24 1 0 0 0.0 0 0
Sept 15 0.21 0.00 35 0.00 0 0.00 35 1 0 0 0.0 0 0
Water Year Totals: 26.33" 21.49" 335 days 21.24" 129 0.25" 206 days 21 42 days 11 days 0.0" 0 days 0 days



Days in Water Year Cell Color Key
        Daily Observation with Prcp         Missing Day
        Multiday Observation         Daily/Multiday Observation Conflict

Day of Year Daily Prcp Multiday Prcp
10/1/2014
10/2/2014
10/3/2014 0.00
10/4/2014
10/5/2014 0.00
10/6/2014
10/7/2014
10/8/2014 0.00
10/9/2014
10/10/2014 0.00
10/11/2014
10/12/2014
10/13/2014
10/14/2014
10/15/2014 T
10/16/2014 0.00 **
10/17/2014 **
10/18/2014 **
10/19/2014 **
10/20/2014 **
10/21/2014 **
10/22/2014 **
10/23/2014 **
10/24/2014 **
10/25/2014 **
10/26/2014 **
10/27/2014 0.25
10/28/2014
10/29/2014 0.00
10/30/2014 0.00
10/31/2014 0.00
11/1/2014 0.45
11/2/2014 0.18
11/3/2014
11/4/2014
11/5/2014
11/6/2014
11/7/2014 0.00
11/8/2014 **
11/9/2014 **
11/10/2014 **
11/11/2014 0.00
11/12/2014 0.00
11/13/2014 0.30
11/14/2014 0.02
11/15/2014
11/16/2014
11/17/2014 0.00
11/18/2014 0.00
11/19/2014 0.02
11/20/2014 0.04
11/21/2014 0.25
11/22/2014 0.05
11/23/2014 0.20
11/24/2014 0.00
11/25/2014 0.00
11/26/2014
11/27/2014
11/28/2014 0.00
11/29/2014 0.25
11/30/2014 0.10
12/1/2014 0.75
12/2/2014 1.15
12/3/2014 2.10
12/4/2014 0.50
12/5/2014 0.02
12/6/2014 0.54
12/7/2014 T
12/8/2014 0.00
12/9/2014
12/10/2014 0.00
12/11/2014 0.24
12/12/2014 4.72
12/13/2014 **
12/14/2014 0.00
12/15/2014 0.80
12/16/2014
12/17/2014 0.82
12/18/2014
12/19/2014 T
12/20/2014
12/21/2014 0.02
12/22/2014 T
12/23/2014
12/24/2014 0.00
12/25/2014 0.08
12/26/2014
12/27/2014 0.00
12/28/2014 0.00
12/29/2014 0.00
12/30/2014 0.00
12/31/2014 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2015 0.00
1/2/2015 0.00
1/3/2015 0.00
1/4/2015
1/5/2015 0.00
1/6/2015 0.00
1/7/2015 0.00
1/8/2015
1/9/2015 0.00
1/10/2015
1/11/2015
1/12/2015 0.00
1/13/2015
1/14/2015 0.00
1/15/2015 0.00
1/16/2015 0.00
1/17/2015
1/18/2015
1/19/2015 0.03
1/20/2015 T
1/21/2015 0.00
1/22/2015 0.00
1/23/2015
1/24/2015 0.00
1/25/2015 0.00
1/26/2015 0.00
1/27/2015 0.00
1/28/2015
1/29/2015 0.00
1/30/2015 0.00
1/31/2015
2/1/2015 0.00
2/2/2015 0.00
2/3/2015 0.00
2/4/2015
2/5/2015 0.00
2/6/2015 0.00
2/7/2015 2.36
2/8/2015 0.30
2/9/2015 1.62
2/10/2015 0.62
2/11/2015 **
2/12/2015 **
2/13/2015 0.00
2/14/2015 **
2/15/2015 **
2/16/2015 0.00
2/17/2015 T
2/18/2015 0.01
2/19/2015 T
2/20/2015 0.00
2/21/2015
2/22/2015
2/23/2015 0.00
2/24/2015 0.00
2/25/2015
2/26/2015 0.00
2/27/2015 0.00
2/28/2015 T
3/1/2015 0.15
3/2/2015 T
3/3/2015 0.05
3/4/2015 0.00
3/5/2015 0.00
3/6/2015 0.00
3/7/2015
3/8/2015 0.00
3/9/2015 0.00
3/10/2015 0.00
3/11/2015 0.08
3/12/2015 0.00
3/13/2015
3/14/2015 0.00 **
3/15/2015 **
3/16/2015 0.00
3/17/2015 0.00
3/18/2015 0.00
3/19/2015
3/20/2015 0.00
3/21/2015 0.00
3/22/2015
3/23/2015 0.12
3/24/2015 0.08
3/25/2015 0.00
3/26/2015 0.00
3/27/2015 0.00
3/28/2015
3/29/2015 0.00
3/30/2015 0.00
3/31/2015
Day of YearDaily PrcpMultiday Prcp
4/1/2015 0.00
4/2/2015
4/3/2015 0.00
4/4/2015 0.00
4/5/2015 0.00
4/6/2015 0.03
4/7/2015 1.01
4/8/2015 0.10
4/9/2015 T
4/10/2015 **
4/11/2015 **
4/12/2015 **
4/13/2015 **
4/14/2015 **
4/15/2015 **
4/16/2015 0.00 **
4/17/2015 **
4/18/2015 **
4/19/2015 **
4/20/2015 0.00
4/21/2015 0.00
4/22/2015
4/23/2015 0.00
4/24/2015
4/25/2015 0.76
4/26/2015 **
4/27/2015 **
4/28/2015 **
4/29/2015 **
4/30/2015 **
5/1/2015 **
5/2/2015 **
5/3/2015 **
5/4/2015 **
5/5/2015 **
5/6/2015 **
5/7/2015 **
5/8/2015 **
5/9/2015 **
5/10/2015 0.00
5/11/2015
5/12/2015 **
5/13/2015 **
5/14/2015 **
5/15/2015 0.10 **
5/16/2015 **
5/17/2015 **
5/18/2015 **
5/19/2015 0.00
5/20/2015
5/21/2015 **
5/22/2015 0.10 **
5/23/2015 **
5/24/2015 **
5/25/2015 **
5/26/2015 **
5/27/2015 **
5/28/2015 **
5/29/2015 **
5/30/2015 **
5/31/2015 **
6/1/2015 **
6/2/2015 **
6/3/2015 0.00
6/4/2015
6/5/2015
6/6/2015
6/7/2015
6/8/2015
6/9/2015
6/10/2015 0.02
6/11/2015 0.10 **
6/12/2015 **
6/13/2015 **
6/14/2015 **
6/15/2015 **
6/16/2015 **
6/17/2015 **
6/18/2015 **
6/19/2015 **
6/20/2015 **
6/21/2015 **
6/22/2015 **
6/23/2015 **
6/24/2015 0.00
6/25/2015
6/26/2015
6/27/2015
6/28/2015 **
6/29/2015 **
6/30/2015 **
Day of YearDaily PrcpMultiday Prcp
7/1/2015 **
7/2/2015 **
7/3/2015 **
7/4/2015 **
7/5/2015 **
7/6/2015 **
7/7/2015 **
7/8/2015 **
7/9/2015 0.00
7/10/2015 T
7/11/2015 **
7/12/2015 **
7/13/2015 **
7/14/2015 **
7/15/2015 **
7/16/2015 **
7/17/2015 **
7/18/2015 **
7/19/2015 **
7/20/2015 0.00
7/21/2015 **
7/22/2015 **
7/23/2015 **
7/24/2015 **
7/25/2015 **
7/26/2015 **
7/27/2015 **
7/28/2015 **
7/29/2015 **
7/30/2015 **
7/31/2015 **
8/1/2015 **
8/2/2015 **
8/3/2015 **
8/4/2015 **
8/5/2015 **
8/6/2015 **
8/7/2015 **
8/8/2015 **
8/9/2015 **
8/10/2015 **
8/11/2015 **
8/12/2015 **
8/13/2015 **
8/14/2015 **
8/15/2015 **
8/16/2015 **
8/17/2015 **
8/18/2015 **
8/19/2015 **
8/20/2015 0.00
8/21/2015
8/22/2015
8/23/2015
8/24/2015
8/25/2015
8/26/2015
8/27/2015
8/28/2015 **
8/29/2015 **
8/30/2015 **
8/31/2015 **
9/1/2015 **
9/2/2015 **
9/3/2015 **
9/4/2015 **
9/5/2015 **
9/6/2015 **
9/7/2015 **
9/8/2015 **
9/9/2015 **
9/10/2015 **
9/11/2015 **
9/12/2015 **
9/13/2015 **
9/14/2015 **
9/15/2015 **
9/16/2015 **
9/17/2015 **
9/18/2015 **
9/19/2015 **
9/20/2015 **
9/21/2015 **
9/22/2015 **
9/23/2015 **
9/24/2015 **
9/25/2015 **
9/26/2015 **
9/27/2015 **
9/28/2015 **
9/29/2015 **
9/30/2015 **



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/3/2014 7:00 AM 0.00 0.0 M M M
10/5/2014 7:00 AM 0.00 0.0 M M M hot and dry!
10/8/2014 7:00 AM 0.00 0.0 M M M
10/10/2014 7:00 AM 0.00 0.0 M M M
10/15/2014 7:00 AM T M M M M nice windy cloudy day yesterday but the merest trace of rain!
10/16/2014 7:00 AM 0.00 0.0 M M M
10/29/2014 7:00 AM 0.00 0.0 M M M
10/30/2014 7:00 AM 0.00 0.0 M M M
10/31/2014 7:00 AM 0.00 0.0 M M M no rain yet!
11/1/2014 7:00 AM 0.45 M M M M it was raining quite hard at 7am--finally!!!!
11/2/2014 7:00 AM 0.18 M M M M
11/7/2014 7:00 AM 0.00 0.0 M M M
11/12/2014 7:00 AM 0.00 0.0 M M M
11/13/2014 7:00 AM 0.30 M M M M clearing skies at 7am
11/14/2014 7:00 AM 0.02 M M M M
11/17/2014 7:00 AM 0.00 0.0 M M M
11/18/2014 7:00 AM 0.00 0.0 M M M
11/19/2014 7:00 AM 0.02 M M M M
11/20/2014 7:00 AM 0.04 M M M M
11/21/2014 7:00 AM 0.25 M M M M nice soaking rain on and off yesterday
11/22/2014 7:00 AM 0.05 M M M M
11/23/2014 7:00 AM 0.20 M M M M
11/24/2014 7:00 AM 0.00 0.0 M M M
11/25/2014 7:00 AM 0.00 0.0 M M M
11/28/2014 7:00 AM 0.00 0.0 M M M
11/29/2014 7:00 AM 0.25 M M M M
11/30/2014 7:00 AM 0.10 M M M M
12/1/2014 7:00 AM 0.75 M M M M thunder and lightening yesterday and more to come tomorrow
12/2/2014 7:00 AM 1.15 M M M M heavy rain overnight and still raining!! finally!
12/3/2014 7:00 AM 2.10 M M M M
12/4/2014 7:00 AM 0.50 M M M M
12/5/2014 7:00 AM 0.02 M M M M
12/6/2014 7:00 AM 0.54 M M M M
12/7/2014 7:00 AM T M M M M
12/8/2014 7:00 AM 0.00 0.0 M M M
12/10/2014 7:00 AM 0.00 0.0 M M M
12/11/2014 7:00 AM 0.24 M M M M huge wind gusts most of night; rain didn't really start until around 5:30am
12/12/2014 7:00 AM 4.72 M M M M rain stopped around 10pm last night and no rain at 7am
12/15/2014 7:00 AM 0.80 M M M M
12/17/2014 7:00 AM 0.82 M M M M
12/19/2014 7:00 AM T M M M M
12/21/2014 7:00 AM 0.02 M M M M
12/22/2014 7:00 AM T M M M M
12/24/2014 7:00 AM 0.00 0.0 M M M
12/25/2014 7:00 AM 0.08 M M M M
12/27/2014 7:00 AM 0.00 0.0 M M M
12/28/2014 7:00 AM 0.00 0.0 M M M
12/29/2014 7:00 AM 0.00 0.0 M M M
12/30/2014 7:00 AM 0.00 0.0 M M M 38 degrees and clear this am
12/31/2014 7:00 AM 0.00 0.0 M M M
1/1/2015 7:00 AM 0.00 0.0 M M M
1/2/2015 7:00 AM 0.00 0.0 M M M
1/3/2015 7:00 AM 0.00 0.0 M M M
1/5/2015 7:00 AM 0.00 0.0 M M M cold and dry!!
1/6/2015 7:00 AM 0.00 0.0 M M M
1/7/2015 7:00 AM 0.00 0.0 M M M
1/9/2015 7:00 AM 0.00 0.0 M M M
1/12/2015 7:00 AM 0.00 0.0 M M M
1/14/2015 7:00 AM 0.00 0.0 M M M
1/15/2015 7:00 AM 0.00 0.0 M M M
1/16/2015 7:00 AM 0.00 0.0 M M M no rain for a month
1/19/2015 7:00 AM 0.03 M M M M some moisture! not much--seems more like heavy fog but some to measure!
1/20/2015 7:00 AM T M M M M
1/21/2015 7:00 AM 0.00 0.0 M M M no fog this am--
1/22/2015 7:00 AM 0.00 0.0 M M M
1/24/2015 7:00 AM 0.00 0.0 M M M dry,warm,sunny!
1/25/2015 7:00 AM 0.00 0.0 M M M
1/26/2015 7:00 AM 0.00 0.0 M M M
1/27/2015 7:00 AM 0.00 0.0 M M M wind picked up around 3am but no rain
1/29/2015 7:00 AM 0.00 0.0 M M M
1/30/2015 7:00 AM 0.00 0.0 M M M
2/1/2015 7:00 AM 0.00 0.0 M M M
2/2/2015 7:00 AM 0.00 0.0 M M M
2/3/2015 7:00 AM 0.00 0.0 M M M
2/5/2015 7:00 AM 0.00 0.0 M M M
2/6/2015 7:00 AM 0.00 0.0 M M M no rain yet!!!
2/7/2015 7:00 AM 2.36 M M M M finally rain! started around 10 am --very windy all day. wind and rain stopped around 11pm.
2/8/2015 7:00 AM 0.30 M M M M started raining 6:30 or 6:45 am
2/9/2015 7:00 AM 1.62 M M M M wind and heavy rain stopped by 11pm last night
2/10/2015 7:00 AM 0.62 M M M M
2/17/2015 7:00 AM T M M M M moisture on the ground and some mist in the air this am
2/18/2015 7:00 AM 0.01 M M M M
2/19/2015 7:00 AM T M M M M
2/20/2015 7:00 AM 0.00 0.0 M M M more fog
2/23/2015 7:00 AM 0.00 0.0 M M M
2/24/2015 7:00 AM 0.00 0.0 M M M
2/26/2015 7:00 AM 0.00 0.0 M M M
2/27/2015 7:00 AM 0.00 0.0 M M M
2/28/2015 7:00 AM T M M M M
3/1/2015 7:00 AM 0.15 M M M M
3/2/2015 7:00 AM T M M M M
3/3/2015 7:00 AM 0.05 M M M M
3/4/2015 7:00 AM 0.00 0.0 M M M
3/5/2015 7:00 AM 0.00 0.0 M M M
3/6/2015 7:00 AM 0.00 0.0 M M M
3/8/2015 7:00 AM 0.00 0.0 M M M bright sun and warm temps all day yesterday--dense fog this morning
3/9/2015 7:00 AM 0.00 0.0 M M M
3/10/2015 7:00 AM 0.00 0.0 M M M dense fog this am
3/11/2015 7:00 AM 0.08 M M M M just a" smattering "of rain
3/12/2015 7:00 AM 0.00 0.0 M M M
3/14/2015 7:00 AM 0.00 0.0 M M M
3/17/2015 7:00 AM 0.00 0.0 M M M
3/18/2015 7:00 AM 0.00 0.0 M M M
3/20/2015 7:00 AM 0.00 0.0 M M M
3/21/2015 7:00 AM 0.00 0.0 M M M heavy fog this am
3/23/2015 7:00 AM 0.12 M M M M
3/24/2015 7:00 AM 0.08 M M M M
3/25/2015 7:00 AM 0.00 0.0 M M M
3/26/2015 7:00 AM 0.00 0.0 M M M
3/27/2015 7:00 AM 0.00 0.0 M M M
3/29/2015 7:00 AM 0.00 0.0 M M M
3/30/2015 7:00 AM 0.00 0.0 M M M
4/1/2015 7:00 AM 0.00 0.0 M M M
4/3/2015 7:00 AM 0.00 0.0 M M M
4/4/2015 7:00 AM 0.00 0.0 M M M
4/5/2015 7:00 AM 0.00 0.0 M M M no rain yet
4/6/2015 7:00 AM 0.03 M M M M
4/7/2015 7:00 AM 1.01 M M M M rains started after midnight--nice to get one inch by 7am!!
4/8/2015 7:00 AM 0.10 M M M M
4/9/2015 7:00 AM T M M M M
4/16/2015 7:00 AM 0.00 0.0 M M M
4/21/2015 7:00 AM 0.00 0.0 M M M
4/23/2015 7:00 AM 0.00 0.0 M M M
4/25/2015 7:00 AM 0.76 M M M M nice soaking rain started about 11pm last night--stopped before 6am
5/15/2015 7:00 AM 0.10 M M M M
5/22/2015 7:00 AM 0.10 M M M M
6/10/2015 7:00 AM 0.02 M M M M after 20% humidity on monday--80% and some rain drops today!
6/11/2015 7:00 AM 0.10 M M M M surprising amount of rain all day yesterday
7/10/2015 7:00 AM T M M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/16/2014 10/27/2014 12:00 AM 12 0.25 M M
11/8/2014 11/11/2014 7:00 AM 4 0.00 M M
12/13/2014 12/14/2014 7:00 AM 2 0.00 M M
2/11/2015 2/13/2015 7:00 AM 3 0.00 M M dry again!
2/14/2015 2/16/2015 7:00 AM 3 0.00 M M
3/14/2015 3/16/2015 7:00 AM 3 0.00 M M
4/10/2015 4/13/2015 7:00 AM 4 0.00 M M
4/11/2015 4/15/2015 7:00 AM 5 0.00 M M
4/12/2015 4/20/2015 7:00 AM 9 0.00 M M
4/26/2015 4/28/2015 7:00 AM 3 0.00 M M
4/27/2015 5/05/2015 7:00 AM 9 0.00 M M
5/5/2015 5/10/2015 7:00 AM 6 0.00 M M
5/12/2015 5/19/2015 7:00 AM 8 0.00 M M
5/21/2015 5/29/2015 7:00 AM 9 0.00 M M we have had foggy gray days for a month!
5/27/2015 6/03/2015 7:00 AM 8 0.00 M M
6/11/2015 6/17/2015 7:00 AM 7 0.00 M M
6/15/2015 6/24/2015 7:00 AM 10 0.00 M M
6/28/2015 7/09/2015 7:00 AM 12 0.00 M M
7/11/2015 8/20/2015 7:00 AM 41 0.00 M M
7/12/2015 7/20/2015 7:00 AM 9 0.00 M M
8/28/2015 9/24/2015 7:00 AM 28 M M M
9/20/2015 10/10/2015 7:00 AM 21 0.00 M M



Observation Date Observation Time Notes Largest Stone Size Average Stone Size Smallest Stone Size Stone Consistency Duration Minutes Durration Accuracy Damage Timing More Rain than Hail Hail Started Largest Hail Started Angle of Impact Number of Stones on Pad Distance Between Stones on Pad Depth of Stones on Ground