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 12 1.19 1.44 14 0.94 8 0.50 6 1 5 2 0.0 0 0
Nov 12 2.99 5.17 29 3.27 5 1.90 24 1 3 1 0.0 0 0
Dec 12 4.80 11.00 30 9.26 18 1.74 12 3 13 3 0.0 0 0
Jan 13 5.34 0.53 28 0.53 7 0.00 21 4 5 2 0.0 0 0
Feb 13 5.03 0.50 18 0.50 11 0.00 7 1 3 2 0.0 0 0
March 13 4.20 1.09 20 1.09 14 0.00 6 3 6 2 0.0 0 0
April 13 1.71 1.26 39 1.26 12 0.00 27 1 5 1 0.0 0 0
May 13 0.63 0.02 28 0.02 7 0.00 21 4 1 4 0.0 0 0
June 13 0.16 0.07 26 0.07 3 0.00 23 1 2 1 0.0 0 0
July 13 0.03 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Aug 13 0.04 0.05 12 0.05 1 0.00 11 0 1 0 0.0 0 0
Sept 13 0.21 0.61 6 0.61 4 0.00 2 1 3 1 0.0 0 0
Water Year Totals: 26.33" 21.74" 250 days 17.60" 90 4.14" 160 days 20 47 days 19 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
10/1/2012
10/2/2012
10/3/2012
10/4/2012
10/5/2012
10/6/2012
10/7/2012
10/8/2012
10/9/2012
10/10/2012
10/11/2012
10/12/2012 **
10/13/2012 **
10/14/2012 **
10/15/2012 **
10/16/2012 **
10/17/2012 0.50
10/18/2012
10/19/2012
10/20/2012
10/21/2012
10/22/2012 0.28
10/23/2012 0.28
10/24/2012 0.20
10/25/2012 0.08
10/26/2012 0.10
10/27/2012
10/28/2012
10/29/2012 T
10/30/2012 T
10/31/2012 0.00
11/1/2012 0.20
11/2/2012 T
11/3/2012
11/4/2012 0.00
11/5/2012 **
11/6/2012 **
11/7/2012 **
11/8/2012 **
11/9/2012 **
11/10/2012 **
11/11/2012 **
11/12/2012 **
11/13/2012 **
11/14/2012 **
11/15/2012 **
11/16/2012 **
11/17/2012 **
11/18/2012 **
11/19/2012 **
11/20/2012 **
11/21/2012 **
11/22/2012 **
11/23/2012 **
11/24/2012 **
11/25/2012 **
11/26/2012 **
11/27/2012 **
11/28/2012 1.90
11/29/2012 1.22
11/30/2012 1.85
12/1/2012 1.52
12/2/2012 1.52
12/3/2012 1.10
12/4/2012 0.02
12/5/2012 0.32
12/6/2012 0.15
12/7/2012 T **
12/8/2012 **
12/9/2012 0.00
12/10/2012 0.00
12/11/2012
12/12/2012 0.10
12/13/2012 0.05
12/14/2012 T **
12/15/2012 **
12/16/2012 **
12/17/2012 0.30
12/18/2012 0.15
12/19/2012 T
12/20/2012
12/21/2012
12/22/2012 1.15
12/23/2012 0.64
12/24/2012 2.50
12/25/2012 **
12/26/2012 **
12/27/2012 **
12/28/2012 **
12/29/2012 1.44
12/30/2012 0.04
12/31/2012 0.00
Day of YearDaily PrcpMultiday Prcp
1/1/2013 M
1/2/2013 **
1/3/2013 **
1/4/2013 **
1/5/2013 T
1/6/2013 0.30
1/7/2013 0.02
1/8/2013
1/9/2013
1/10/2013 0.04
1/11/2013 T
1/12/2013 **
1/13/2013 **
1/14/2013 **
1/15/2013 **
1/16/2013 **
1/17/2013 **
1/18/2013 0.00
1/19/2013 **
1/20/2013 **
1/21/2013 **
1/22/2013 0.00
1/23/2013
1/24/2013 0.12
1/25/2013 0.05
1/26/2013 T
1/27/2013 **
1/28/2013 **
1/29/2013 **
1/30/2013 **
1/31/2013 **
2/1/2013 0.00
2/2/2013 0.00
2/3/2013
2/4/2013 0.00
2/5/2013 0.00
2/6/2013
2/7/2013
2/8/2013 0.06
2/9/2013 0.04
2/10/2013
2/11/2013 0.00
2/12/2013 0.00
2/13/2013
2/14/2013
2/15/2013
2/16/2013
2/17/2013
2/18/2013
2/19/2013
2/20/2013 0.40
2/21/2013 T
2/22/2013 0.00
2/23/2013 T **
2/24/2013 **
2/25/2013 **
2/26/2013 **
2/27/2013 **
2/28/2013 **
3/1/2013 **
3/2/2013 0.00
3/3/2013
3/4/2013 0.00
3/5/2013
3/6/2013 0.34
3/7/2013 T
3/8/2013 0.45
3/9/2013 **
3/10/2013 0.00
3/11/2013 0.00
3/12/2013 0.00
3/13/2013
3/14/2013
3/15/2013
3/16/2013
3/17/2013
3/18/2013
3/19/2013 0.00
3/20/2013 0.12
3/21/2013 T
3/22/2013 0.00
3/23/2013 **
3/24/2013 0.00
3/25/2013
3/26/2013 0.00
3/27/2013
3/28/2013 0.03
3/29/2013
3/30/2013 0.03
3/31/2013 0.12
Day of YearDaily PrcpMultiday Prcp
4/1/2013 0.15
4/2/2013 0.00
4/3/2013 0.00
4/4/2013 0.30
4/5/2013 0.60
4/6/2013 0.03
4/7/2013
4/8/2013 0.18
4/9/2013 0.00
4/10/2013 0.00
4/11/2013 0.00
4/12/2013
4/13/2013
4/14/2013
4/15/2013 T **
4/16/2013 0.00 **
4/17/2013 **
4/18/2013 **
4/19/2013 **
4/20/2013 **
4/21/2013 **
4/22/2013 **
4/23/2013 **
4/24/2013 **
4/25/2013 **
4/26/2013 **
4/27/2013 **
4/28/2013 **
4/29/2013 **
4/30/2013 **
5/1/2013 0.00
5/2/2013 **
5/3/2013 **
5/4/2013 **
5/5/2013 0.00
5/6/2013
5/7/2013 T
5/8/2013 0.00
5/9/2013
5/10/2013
5/11/2013
5/12/2013
5/13/2013
5/14/2013
5/15/2013
5/16/2013 T
5/17/2013 0.02
5/18/2013 **
5/19/2013 **
5/20/2013 **
5/21/2013 **
5/22/2013 **
5/23/2013 **
5/24/2013 **
5/25/2013 **
5/26/2013 0.00
5/27/2013 0.00
5/28/2013 T
5/29/2013 T
5/30/2013 **
5/31/2013 **
6/1/2013 **
6/2/2013 **
6/3/2013 **
6/4/2013 **
6/5/2013 **
6/6/2013 **
6/7/2013 **
6/8/2013 **
6/9/2013 **
6/10/2013 **
6/11/2013 **
6/12/2013 **
6/13/2013 **
6/14/2013 **
6/15/2013 **
6/16/2013 **
6/17/2013 **
6/18/2013 **
6/19/2013 **
6/20/2013 **
6/21/2013 **
6/22/2013 **
6/23/2013 0.00
6/24/2013 T
6/25/2013 0.05
6/26/2013 0.02
6/27/2013
6/28/2013
6/29/2013
6/30/2013
Day of YearDaily PrcpMultiday Prcp
7/1/2013
7/2/2013
7/3/2013
7/4/2013
7/5/2013
7/6/2013
7/7/2013
7/8/2013
7/9/2013
7/10/2013
7/11/2013
7/12/2013
7/13/2013
7/14/2013
7/15/2013
7/16/2013
7/17/2013
7/18/2013
7/19/2013
7/20/2013
7/21/2013
7/22/2013
7/23/2013
7/24/2013
7/25/2013
7/26/2013
7/27/2013
7/28/2013
7/29/2013
7/30/2013
7/31/2013
8/1/2013
8/2/2013
8/3/2013
8/4/2013
8/5/2013
8/6/2013
8/7/2013
8/8/2013
8/9/2013
8/10/2013
8/11/2013
8/12/2013
8/13/2013
8/14/2013
8/15/2013
8/16/2013
8/17/2013
8/18/2013
8/19/2013
8/20/2013 0.05
8/21/2013 **
8/22/2013 **
8/23/2013 **
8/24/2013 **
8/25/2013 **
8/26/2013 **
8/27/2013 **
8/28/2013 **
8/29/2013 **
8/30/2013 **
8/31/2013 **
9/1/2013 **
9/2/2013 0.00
9/3/2013 T
9/4/2013
9/5/2013
9/6/2013
9/7/2013
9/8/2013
9/9/2013
9/10/2013
9/11/2013
9/12/2013
9/13/2013
9/14/2013
9/15/2013
9/16/2013
9/17/2013
9/18/2013
9/19/2013
9/20/2013
9/21/2013 0.05
9/22/2013 0.54
9/23/2013
9/24/2013
9/25/2013
9/26/2013
9/27/2013
9/28/2013
9/29/2013
9/30/2013 0.02



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/22/2012 7:00 AM 0.28 M M M M finally!! Rain!
10/23/2012 7:00 AM 0.28 M M M M
10/24/2012 7:00 AM 0.20 M M M M
10/25/2012 7:00 AM 0.08 M M M M
10/26/2012 7:00 AM 0.10 M M M M
10/29/2012 7:00 AM T M M M M
10/30/2012 7:00 AM T M M M M thick fog again this am
10/31/2012 7:00 AM 0.00 0.0 M M M
11/1/2012 7:00 AM 0.20 M M M M
11/2/2012 7:00 AM T M M M M clear skies and bright moon last night--but moisture in am
11/4/2012 7:00 AM 0.00 0.0 M M M
11/29/2012 7:00 AM 1.22 M M M M great downpour yesterday!
11/30/2012 7:00 AM 1.85 M M M M Huge winds,heavy rain overnight!
12/1/2012 7:00 AM 1.52 M M M M
12/2/2012 8:00 AM 1.52 M M M M huge winds and rain started late last night; lots of local flooding
12/3/2012 7:00 AM 1.10 M M M M
12/4/2012 7:00 AM 0.02 M M M M
12/5/2012 7:00 AM 0.32 M M M M
12/6/2012 7:00 AM 0.15 M M M M
12/7/2012 7:00 AM T M M M M
12/10/2012 7:00 AM 0.00 0.0 M M M
12/12/2012 7:00 AM 0.10 M M M M light rain overnight
12/13/2012 7:00 AM 0.05 M M M M
12/14/2012 7:00 AM T M M M M red sunrise this am!
12/18/2012 7:00 AM 0.15 M M M M
12/19/2012 7:00 AM T M M M M chilly and windy--around 30 degrees overnight! more rain tomorrow!
12/22/2012 7:00 AM 1.15 M M M M started heavy rain overnight,thunder and lightening early am
12/23/2012 7:00 AM 0.64 M M M M started raining again early am--more today
12/24/2012 7:00 AM 2.50 M M M M heavy rains all day yesterday; alot of local flooding probems. clear and sunny this am
12/30/2012 7:00 AM 0.04 M M M M
12/31/2012 7:00 AM 0.00 0.0 M M M
1/1/2013 7:00 AM M M M M M (edit: daily precip initially recorded as 0.20". changed to NA due to decimal error suspicion. observer contacted. P.G.)
1/6/2013 7:00 AM 0.30 M M M M
1/7/2013 7:00 AM 0.02 M M M M
1/10/2013 7:00 AM 0.04 M M M M
1/11/2013 7:00 AM T M M M M 32 degrees this am
1/24/2013 7:00 AM 0.12 M M M M finally rain!
1/25/2013 7:00 AM 0.05 M M M M
1/26/2013 7:00 AM T M M M M
2/2/2013 7:00 AM 0.00 0.0 M M M
2/4/2013 7:00 AM 0.00 0.0 M M M super foggy
2/5/2013 7:00 AM 0.00 0.0 M M M
2/8/2013 7:00 AM 0.06 M M M M
2/9/2013 7:00 AM 0.04 M M M M
2/11/2013 7:00 AM 0.00 0.0 M M M
2/12/2013 7:00 AM 0.00 0.0 M M M
2/20/2013 7:00 AM 0.40 M M M M 32 degrees and icy this am
2/21/2013 7:00 AM T M M M M
2/22/2013 7:00 AM 0.00 0.0 M M M
2/23/2013 7:00 AM T M M M M
3/4/2013 7:00 AM 0.00 0.0 M M M much colder, windy no rain yet
3/6/2013 7:00 AM 0.34 M M M M extremely windy last night
3/7/2013 7:00 AM T M M M M
3/8/2013 7:00 AM 0.45 M M M M
3/11/2013 7:00 AM 0.00 0.0 M M M
3/12/2013 7:00 AM 0.00 0.0 M M M
3/19/2013 7:00 AM 0.00 0.0 M M M
3/20/2013 7:00 AM 0.12 M M M M
3/21/2013 7:00 AM T M M M M
3/22/2013 7:00 AM 0.00 0.0 M M M
3/26/2013 7:00 AM 0.00 0.0 M M M
3/28/2013 7:00 AM 0.03 M M M M
3/30/2013 7:00 AM 0.03 M M M M
3/31/2013 7:00 AM 0.12 M M M M
4/1/2013 7:00 AM 0.15 M M M M
4/2/2013 7:00 AM 0.00 0.0 M M M
4/3/2013 7:00 AM 0.00 0.0 M M M fog but no rain--
4/4/2013 7:00 AM 0.30 M M M M
4/5/2013 7:00 AM 0.60 M M M M
4/6/2013 7:00 AM 0.03 M M M M
4/8/2013 7:00 AM 0.18 M M M M rain stopped but strong winds and chilly temp
4/9/2013 7:00 AM 0.00 0.0 M M M still breezy but not the big winds of yesterday
4/10/2013 7:00 AM 0.00 0.0 M M M
4/11/2013 7:00 AM 0.00 0.0 M M M
4/15/2013 7:00 AM T M M M M
4/16/2013 7:00 AM 0.00 0.0 M M M
5/7/2013 7:00 AM T M M M M
5/8/2013 7:00 AM 0.00 0.0 M M M
5/16/2013 7:00 AM T M M M M
5/17/2013 7:00 AM 0.02 M M M M
5/27/2013 7:00 AM 0.00 0.0 M M M
5/28/2013 7:00 AM T M M M M
5/29/2013 7:00 AM T M M M M
6/24/2013 7:00 AM T M M M M
6/25/2013 7:00 AM 0.05 M M M M looks like skies are clearing this am--though rain predicted all day
6/26/2013 7:00 AM 0.02 M M M M
8/20/2013 7:00 AM 0.05 M M M M thunder and lightening around 8:30 last evening!! foggy this morning--
9/3/2013 7:00 AM T M M M M
9/21/2013 7:00 AM 0.05 M M M M
9/22/2013 7:00 AM 0.54 M M M M
9/30/2013 7:00 AM 0.02 M M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/12/2012 10/17/2012 7:00 AM 6 0.50 M M
11/5/2012 11/28/2012 7:00 AM 24 1.90 M M
12/7/2012 12/09/2012 7:00 AM 3 0.00 M M
12/14/2012 12/17/2012 7:00 AM 4 0.30 M M
12/25/2012 12/29/2012 7:00 AM 5 1.44 M M
1/2/2013 1/05/2013 7:00 AM 4 T M M
1/12/2013 1/15/2013 7:00 AM 4 0.00 M M
1/15/2013 1/18/2013 12:00 AM 4 0.00 M M
1/19/2013 1/22/2013 12:00 AM 4 0.00 M M
1/27/2013 2/01/2013 12:00 AM 6 0.00 M M
2/23/2013 3/02/2013 12:00 AM 8 0.00 M M
3/9/2013 3/10/2013 12:00 AM 2 0.00 M M
3/23/2013 3/24/2013 12:00 AM 2 0.00 M M
4/15/2013 4/25/2013 12:00 AM 11 0.00 M M
4/22/2013 5/05/2013 12:00 AM 14 0.00 M M
4/24/2013 5/01/2013 7:00 AM 8 0.00 M M
5/18/2013 5/22/2013 12:00 AM 5 0.00 M M
5/19/2013 5/26/2013 12:00 AM 8 0.00 M M
5/30/2013 6/23/2013 12:00 AM 25 0.00 M M
8/21/2013 9/02/2013 12:00 AM 13 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