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 17 1.19 0.26 3 0.26 3 0.00 0 0 1 0 0.0 0 0
Nov 17 2.99 3.32 14 3.32 14 0.00 0 0 5 3 0.0 0 0
Dec 17 4.80 0.24 5 0.20 1 0.04 4 1 1 0 0.0 0 0
Jan 18 5.34 4.53 18 4.53 16 0.00 2 1 11 1 0.0 0 0
Feb 18 5.03 0.38 6 0.38 6 0.00 0 0 3 1 0.0 0 0
March 18 4.20 4.92 24 4.32 19 0.60 5 1 14 1 0.0 0 0
April 18 1.71 2.25 23 2.25 20 0.00 3 1 5 4 0.0 0 0
May 18 0.63 0.00 2 0.00 2 0.00 0 0 0 0 0.0 0 0
June 18 0.16 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
July 18 0.03 0.02 1 0.02 1 0.00 0 0 1 0 0.0 0 0
Aug 18 0.04 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Sept 18 0.21 0.00 0 0.00 0 0.00 0 0 0 0 0.0 0 0
Water Year Totals: 26.33" 15.92" 96 days 15.28" 82 0.64" 14 days 4 41 days 10 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
10/1/2017
10/2/2017
10/3/2017
10/4/2017
10/5/2017
10/6/2017
10/7/2017
10/8/2017
10/9/2017
10/10/2017
10/11/2017
10/12/2017
10/13/2017
10/14/2017
10/15/2017
10/16/2017
10/17/2017
10/18/2017
10/19/2017
10/20/2017 0.26
10/21/2017
10/22/2017
10/23/2017
10/24/2017
10/25/2017 0.00
10/26/2017
10/27/2017
10/28/2017 0.00
10/29/2017
10/30/2017
10/31/2017
11/1/2017
11/2/2017
11/3/2017
11/4/2017 0.12
11/5/2017 0.00
11/6/2017
11/7/2017
11/8/2017 0.00
11/9/2017 0.30
11/10/2017 T
11/11/2017
11/12/2017
11/13/2017 T
11/14/2017
11/15/2017 T
11/16/2017 1.05
11/17/2017 1.20
11/18/2017 0.00
11/19/2017
11/20/2017 0.00
11/21/2017
11/22/2017
11/23/2017
11/24/2017
11/25/2017
11/26/2017 0.00
11/27/2017 0.65
11/28/2017
11/29/2017 0.00
11/30/2017
12/1/2017 **
12/2/2017 **
12/3/2017 **
12/4/2017 0.04
12/5/2017
12/6/2017
12/7/2017
12/8/2017
12/9/2017
12/10/2017
12/11/2017
12/12/2017
12/13/2017
12/14/2017
12/15/2017
12/16/2017
12/17/2017
12/18/2017
12/19/2017
12/20/2017 0.20
12/21/2017
12/22/2017
12/23/2017
12/24/2017
12/25/2017
12/26/2017
12/27/2017
12/28/2017
12/29/2017
12/30/2017
12/31/2017
Day of YearDaily PrcpMultiday Prcp
1/1/2018
1/2/2018
1/3/2018
1/4/2018 0.34
1/5/2018 0.05
1/6/2018 **
1/7/2018 M
1/8/2018 0.56
1/9/2018 2.20
1/10/2018 0.25
1/11/2018 T
1/12/2018
1/13/2018
1/14/2018
1/15/2018 0.00
1/16/2018
1/17/2018
1/18/2018
1/19/2018 0.10
1/20/2018 0.02
1/21/2018 0.00
1/22/2018 0.30
1/23/2018 0.12
1/24/2018
1/25/2018 0.55
1/26/2018 0.04
1/27/2018
1/28/2018 0.00
1/29/2018 0.00
1/30/2018
1/31/2018
2/1/2018
2/2/2018
2/3/2018
2/4/2018
2/5/2018
2/6/2018
2/7/2018
2/8/2018
2/9/2018
2/10/2018
2/11/2018
2/12/2018
2/13/2018
2/14/2018
2/15/2018
2/16/2018
2/17/2018
2/18/2018
2/19/2018 T
2/20/2018 0.00
2/21/2018
2/22/2018 0.00
2/23/2018 0.04
2/24/2018
2/25/2018
2/26/2018 0.02
2/27/2018 0.32
2/28/2018
3/1/2018 0.55
3/2/2018
3/3/2018 **
3/4/2018 **
3/5/2018 0.60
3/6/2018
3/7/2018 0.01
3/8/2018 0.05
3/9/2018 0.00
3/10/2018
3/11/2018 T
3/12/2018
3/13/2018 0.30
3/14/2018 0.30
3/15/2018 0.22
3/16/2018 0.55
3/17/2018 0.15
3/18/2018 0.30
3/19/2018 0.00
3/20/2018 0.00
3/21/2018 0.25
3/22/2018 0.96
3/23/2018 0.28
3/24/2018 0.15
3/25/2018 0.25
3/26/2018
3/27/2018 0.00
3/28/2018
3/29/2018
3/30/2018 **
3/31/2018 **
Day of YearDaily PrcpMultiday Prcp
4/1/2018 **
4/2/2018 **
4/3/2018 0.00
4/4/2018
4/5/2018
4/6/2018 0.40
4/7/2018 1.25
4/8/2018 T
4/9/2018 0.00
4/10/2018 0.00
4/11/2018 T
4/12/2018 0.20
4/13/2018 T
4/14/2018
4/15/2018 0.00
4/16/2018 0.20
4/17/2018 0.20
4/18/2018
4/19/2018
4/20/2018 0.00
4/21/2018
4/22/2018 0.00
4/23/2018 0.00
4/24/2018 0.00
4/25/2018 0.00
4/26/2018
4/27/2018 0.00
4/28/2018 0.00
4/29/2018 0.00
4/30/2018 T
5/1/2018 0.00
5/2/2018
5/3/2018 0.00
5/4/2018
5/5/2018
5/6/2018
5/7/2018
5/8/2018
5/9/2018
5/10/2018
5/11/2018
5/12/2018
5/13/2018
5/14/2018
5/15/2018
5/16/2018
5/17/2018
5/18/2018
5/19/2018
5/20/2018
5/21/2018
5/22/2018
5/23/2018
5/24/2018
5/25/2018
5/26/2018
5/27/2018
5/28/2018
5/29/2018
5/30/2018
5/31/2018
6/1/2018
6/2/2018
6/3/2018
6/4/2018
6/5/2018
6/6/2018
6/7/2018
6/8/2018
6/9/2018
6/10/2018
6/11/2018
6/12/2018
6/13/2018
6/14/2018
6/15/2018
6/16/2018
6/17/2018
6/18/2018
6/19/2018
6/20/2018
6/21/2018
6/22/2018
6/23/2018
6/24/2018
6/25/2018
6/26/2018
6/27/2018
6/28/2018
6/29/2018
6/30/2018
Day of YearDaily PrcpMultiday Prcp
7/1/2018
7/2/2018
7/3/2018
7/4/2018
7/5/2018
7/6/2018
7/7/2018
7/8/2018
7/9/2018
7/10/2018
7/11/2018
7/12/2018
7/13/2018 0.02
7/14/2018
7/15/2018
7/16/2018
7/17/2018
7/18/2018
7/19/2018
7/20/2018
7/21/2018
7/22/2018
7/23/2018
7/24/2018
7/25/2018
7/26/2018
7/27/2018
7/28/2018
7/29/2018
7/30/2018
7/31/2018
8/1/2018
8/2/2018
8/3/2018
8/4/2018
8/5/2018
8/6/2018
8/7/2018
8/8/2018
8/9/2018
8/10/2018
8/11/2018
8/12/2018
8/13/2018
8/14/2018
8/15/2018
8/16/2018
8/17/2018
8/18/2018
8/19/2018
8/20/2018
8/21/2018
8/22/2018
8/23/2018
8/24/2018
8/25/2018
8/26/2018
8/27/2018
8/28/2018
8/29/2018
8/30/2018
8/31/2018
9/1/2018
9/2/2018
9/3/2018
9/4/2018
9/5/2018
9/6/2018
9/7/2018
9/8/2018
9/9/2018
9/10/2018
9/11/2018
9/12/2018
9/13/2018
9/14/2018
9/15/2018
9/16/2018
9/17/2018
9/18/2018
9/19/2018
9/20/2018
9/21/2018
9/22/2018
9/23/2018
9/24/2018
9/25/2018
9/26/2018
9/27/2018
9/28/2018
9/29/2018
9/30/2018



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/20/2017 7:00 AM 0.26 M M M M
10/25/2017 7:00 AM 0.00 0.0 M M M
10/28/2017 7:00 AM 0.00 0.0 M M M
11/4/2017 7:00 AM 0.12 M M M M
11/5/2017 7:00 AM 0.00 0.0 M M M
11/8/2017 7:00 AM 0.00 0.0 M M M
11/9/2017 7:00 AM 0.30 M M M M
11/10/2017 7:00 AM T M M M M
11/13/2017 7:00 AM T M M M M
11/15/2017 7:00 AM T M M M M
11/16/2017 7:00 AM 1.05 M M M M
11/17/2017 7:00 AM 1.20 M M M M
11/18/2017 7:00 AM 0.00 0.0 M M M
11/20/2017 7:00 AM 0.00 0.0 M M M
11/26/2017 7:00 AM 0.00 0.0 M M M
11/27/2017 7:00 AM 0.65 M M M M
11/29/2017 7:00 AM 0.00 0.0 M M M
12/20/2017 7:00 AM 0.20 M M M M
1/4/2018 7:00 AM 0.34 M M M M
1/5/2018 7:00 AM 0.05 M M M M
1/8/2018 7:00 AM 0.56 M M M M
1/9/2018 7:00 AM 2.20 M M M M
1/10/2018 7:00 AM 0.25 M M M M
1/11/2018 7:00 AM T M M M M
1/15/2018 7:00 AM 0.00 0.0 M M M
1/19/2018 7:00 AM 0.10 M M M M
1/20/2018 7:00 AM 0.02 M M M M
1/21/2018 7:00 AM 0.00 0.0 M M M
1/22/2018 7:00 AM 0.30 M M M M
1/23/2018 7:00 AM 0.12 M M M M
1/25/2018 7:00 AM 0.55 M M M M
1/26/2018 7:00 AM 0.04 M M M M
1/28/2018 7:00 AM 0.00 0.0 M M M
1/29/2018 7:00 AM 0.00 0.0 M M M
2/19/2018 7:00 AM T M M M M
2/20/2018 7:00 AM 0.00 0.0 M M M
2/22/2018 7:00 AM 0.00 0.0 M M M
2/23/2018 7:00 AM 0.04 M M M M
2/26/2018 7:00 AM 0.02 M M M M
2/27/2018 7:00 AM 0.32 M M M M
3/1/2018 7:00 AM 0.55 M M M M
3/7/2018 7:00 AM 0.01 M M M M
3/8/2018 7:00 AM 0.05 M M M M
3/9/2018 7:00 AM 0.00 0.0 M M M
3/11/2018 7:00 AM T M M M M
3/13/2018 7:00 AM 0.30 M M M M
3/14/2018 7:00 AM 0.30 M M M M
3/15/2018 7:00 AM 0.22 M M M M
3/16/2018 7:00 AM 0.55 M M M M
3/17/2018 7:00 AM 0.15 M M M M
3/18/2018 7:00 AM 0.30 M M M M
3/19/2018 7:00 AM 0.00 0.0 M M M
3/20/2018 7:00 AM 0.00 0.0 M M M
3/21/2018 7:00 AM 0.25 M M M M
3/22/2018 7:00 AM 0.96 M M M M
3/23/2018 7:00 AM 0.28 M M M M
3/24/2018 7:00 AM 0.15 M M M M
3/25/2018 7:00 AM 0.25 M M M M
3/27/2018 7:00 AM 0.00 0.0 M M M
4/6/2018 7:00 AM 0.40 M M M M
4/7/2018 7:00 AM 1.25 M M M M
4/8/2018 7:00 AM T M M M M
4/9/2018 7:00 AM 0.00 0.0 M M M
4/10/2018 7:00 AM 0.00 0.0 M M M
4/11/2018 7:00 AM T M M M M
4/12/2018 7:00 AM 0.20 M M M M
4/13/2018 7:00 AM T M M M M
4/15/2018 7:00 AM 0.00 0.0 M M M
4/16/2018 7:00 AM 0.20 0.0 M M M
4/17/2018 7:00 AM 0.20 M M M M
4/20/2018 7:00 AM 0.00 0.0 M M M
4/22/2018 7:00 AM 0.00 0.0 M M M
4/23/2018 7:00 AM 0.00 0.0 M M M
4/24/2018 7:00 AM 0.00 0.0 M M M
4/25/2018 7:00 AM 0.00 0.0 M M M
4/27/2018 7:00 AM 0.00 0.0 M M M
4/28/2018 7:00 AM 0.00 0.0 M M M
4/29/2018 7:00 AM 0.00 0.0 M M M
4/30/2018 7:00 AM T M M M M
5/1/2018 7:00 AM 0.00 0.0 M M M
5/3/2018 7:00 AM 0.00 0.0 M M M
7/13/2018 7:00 AM 0.02 M M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
12/1/2017 12/04/2017 7:00 AM 4 0.04 M M
1/6/2018 1/07/2018 7:00 AM 2 M M M {EDIT: Observer reported 14.00 for multi day precip. This appears to be a decimal typo. Changed report of 14.00 to NA until observer can be contacted to verify. Submission Time Before EDIT: 1/08/2018 8:06 AM CoCoSTAFF DNT}
3/3/2018 3/05/2018 7:00 AM 3 0.60 M M
3/30/2018 4/03/2018 7:00 AM 5 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