Station Overview Station Location
Station Number CT-NH-31 Latitude 41.334459
Station Name Derby 1.6 WNW Longitude -73.111354
County New Haven Elevation (ft) 129



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 16 4.67 2.69 26 2.19 7 0.50 19 3 4 0 0.0 0 0
Nov 16 4.37 2.72 19 2.72 11 0.00 8 3 5 0 0.0 0 0
Dec 16 3.94 3.78 18 3.78 16 0.00 2 1 8 2 4.7 1 1
Jan 17 3.89 4.12 20 4.12 20 0.00 0 0 9 2 6.2 2 2
Feb 17 3.20 2.68 22 1.80 12 0.88 10 3 5 2 6.6 2 0
March 17 4.66 1.72 20 1.20 14 0.52 6 1 6 2 13.0 3 2
April 17 4.71 6.64 15 3.69 8 2.95 7 3 6 0 0.0 0 0
May 17 4.35 5.67 28 3.59 3 2.08 25 7 3 0 0.0 0 0
June 17 4.21 2.95 23 2.71 11 0.24 12 3 6 0 0.0 0 0
July 17 3.98 3.97 24 3.97 9 0.00 15 3 8 0 0.0 0 0
Aug 17 4.00 2.60 15 2.02 6 0.58 9 2 6 0 0.0 0 0
Sept 17 4.16 1.34 9 0.95 3 0.39 6 1 2 0 0.0 0 0
Water Year Totals: 50.14" 40.88" 239 days 32.74" 120 8.14" 119 days 30 68 days 8 days 30.5" 8 days 5 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
10/1/2016 **
10/2/2016 **
10/3/2016 **
10/4/2016 **
10/5/2016 **
10/6/2016 **
10/7/2016 **
10/8/2016 T
10/9/2016 0.45
10/10/2016 **
10/11/2016 **
10/12/2016 **
10/13/2016 **
10/14/2016 **
10/15/2016 **
10/16/2016 **
10/17/2016 **
10/18/2016 T
10/19/2016 0.00
10/20/2016
10/21/2016 **
10/22/2016 0.50
10/23/2016
10/24/2016 0.20
10/25/2016
10/26/2016
10/27/2016
10/28/2016 1.00
10/29/2016 0.00
10/30/2016 0.00
10/31/2016 0.54
11/1/2016
11/2/2016 **
11/3/2016 0.00
11/4/2016 0.00
11/5/2016 0.00
11/6/2016 **
11/7/2016 **
11/8/2016 0.00
11/9/2016 0.00
11/10/2016 0.02
11/11/2016 0.00
11/12/2016
11/13/2016
11/14/2016
11/15/2016 0.03
11/16/2016 1.03
11/17/2016 0.00
11/18/2016
11/19/2016
11/20/2016
11/21/2016
11/22/2016 **
11/23/2016 **
11/24/2016 0.00
11/25/2016 0.05
11/26/2016 0.00
11/27/2016
11/28/2016
11/29/2016
11/30/2016 1.59
12/1/2016 0.90
12/2/2016 0.00
12/3/2016 T
12/4/2016
12/5/2016
12/6/2016
12/7/2016 0.56
12/8/2016
12/9/2016
12/10/2016
12/11/2016
12/12/2016 0.60 **
12/13/2016 0.00
12/14/2016 0.00
12/15/2016 T
12/16/2016
12/17/2016 0.47
12/18/2016 0.34
12/19/2016 0.14
12/20/2016
12/21/2016 0.00
12/22/2016 0.00
12/23/2016 0.00
12/24/2016 0.25
12/25/2016
12/26/2016
12/27/2016
12/28/2016
12/29/2016 0.00
12/30/2016 0.52
12/31/2016
Day of YearDaily PrcpMultiday Prcp
1/1/2017
1/2/2017
1/3/2017
1/4/2017 0.25
1/5/2017 0.00
1/6/2017 M
1/7/2017 T
1/8/2017 0.50
1/9/2017
1/10/2017 0.00
1/11/2017 0.40
1/12/2017 0.10
1/13/2017 0.00
1/14/2017 0.00
1/15/2017 1.00
1/16/2017 0.00
1/17/2017
1/18/2017 0.30
1/19/2017 0.00
1/20/2017
1/21/2017 0.03
1/22/2017
1/23/2017
1/24/2017 1.12
1/25/2017 0.42
1/26/2017 0.00
1/27/2017 T
1/28/2017 0.00
1/29/2017
1/30/2017
1/31/2017 0.00
2/1/2017 0.23
2/2/2017 0.00
2/3/2017 0.00
2/4/2017 0.00
2/5/2017
2/6/2017 0.00
2/7/2017 0.03
2/8/2017 0.26
2/9/2017 **
2/10/2017 0.85
2/11/2017 T
2/12/2017
2/13/2017 0.52
2/14/2017 **
2/15/2017 **
2/16/2017 **
2/17/2017 **
2/18/2017 0.03
2/19/2017
2/20/2017
2/21/2017
2/22/2017 **
2/23/2017 **
2/24/2017 0.00
2/25/2017 T
2/26/2017 0.76
2/27/2017
2/28/2017 0.00
3/1/2017 0.00
3/2/2017 0.15
3/3/2017 0.00
3/4/2017 0.00
3/5/2017
3/6/2017
3/7/2017 0.05
3/8/2017 0.10
3/9/2017
3/10/2017 0.16
3/11/2017 T
3/12/2017
3/13/2017
3/14/2017
3/15/2017 T
3/16/2017
3/17/2017 0.00
3/18/2017 0.00
3/19/2017
3/20/2017
3/21/2017
3/22/2017
3/23/2017 **
3/24/2017 **
3/25/2017 **
3/26/2017 **
3/27/2017 **
3/28/2017 0.52
3/29/2017 0.42
3/30/2017 0.00
3/31/2017 0.32
Day of YearDaily PrcpMultiday Prcp
4/1/2017 1.08
4/2/2017
4/3/2017 **
4/4/2017 1.62
4/5/2017 0.22
4/6/2017 0.23
4/7/2017 1.51
4/8/2017
4/9/2017
4/10/2017
4/11/2017 0.00
4/12/2017 0.00
4/13/2017
4/14/2017
4/15/2017
4/16/2017
4/17/2017
4/18/2017
4/19/2017
4/20/2017 0.32
4/21/2017 **
4/22/2017 0.42
4/23/2017
4/24/2017 **
4/25/2017 **
4/26/2017 0.91
4/27/2017 0.33
4/28/2017
4/29/2017
4/30/2017
5/1/2017
5/2/2017 **
5/3/2017 **
5/4/2017 0.00
5/5/2017 0.06
5/6/2017 2.18
5/7/2017 **
5/8/2017 **
5/9/2017 **
5/10/2017 **
5/11/2017 **
5/12/2017 0.00
5/13/2017
5/14/2017 1.35
5/15/2017 **
5/16/2017 **
5/17/2017 **
5/18/2017 **
5/19/2017 **
5/20/2017 0.00
5/21/2017
5/22/2017 **
5/23/2017 **
5/24/2017 **
5/25/2017 **
5/26/2017 1.54
5/27/2017
5/28/2017
5/29/2017 **
5/30/2017 **
5/31/2017 0.17
6/1/2017 0.51
6/2/2017 0.00
6/3/2017 0.00
6/4/2017
6/5/2017 0.37
6/6/2017 0.16
6/7/2017 0.10
6/8/2017 0.00
6/9/2017 0.00
6/10/2017 0.00
6/11/2017 **
6/12/2017 **
6/13/2017 **
6/14/2017 **
6/15/2017 **
6/16/2017 **
6/17/2017 **
6/18/2017 0.24
6/19/2017
6/20/2017 1.16
6/21/2017 **
6/22/2017 **
6/23/2017 0.00
6/24/2017 0.41
6/25/2017
6/26/2017
6/27/2017
6/28/2017
6/29/2017
6/30/2017
Day of YearDaily PrcpMultiday Prcp
7/1/2017 0.94
7/2/2017
7/3/2017
7/4/2017
7/5/2017
7/6/2017
7/7/2017 0.20
7/8/2017 1.30
7/9/2017 **
7/10/2017 0.00
7/11/2017 0.41
7/12/2017
7/13/2017
7/14/2017 0.41
7/15/2017 0.13
7/16/2017 **
7/17/2017 **
7/18/2017 **
7/19/2017 **
7/20/2017 **
7/21/2017 **
7/22/2017 **
7/23/2017 0.00
7/24/2017 0.27
7/25/2017 0.31
7/26/2017 **
7/27/2017 **
7/28/2017 0.00
7/29/2017 0.00
7/30/2017 **
7/31/2017 **
8/1/2017 **
8/2/2017 0.00
8/3/2017 0.12
8/4/2017
8/5/2017 0.96
8/6/2017 **
8/7/2017 **
8/8/2017 **
8/9/2017 **
8/10/2017 **
8/11/2017 0.58
8/12/2017 0.37
8/13/2017
8/14/2017
8/15/2017 0.12
8/16/2017
8/17/2017
8/18/2017
8/19/2017
8/20/2017
8/21/2017
8/22/2017
8/23/2017 0.25
8/24/2017
8/25/2017
8/26/2017
8/27/2017
8/28/2017
8/29/2017
8/30/2017 0.20
8/31/2017 **
9/1/2017 **
9/2/2017 **
9/3/2017 **
9/4/2017 **
9/5/2017 **
9/6/2017 0.39
9/7/2017 0.61
9/8/2017
9/9/2017
9/10/2017
9/11/2017
9/12/2017
9/13/2017
9/14/2017
9/15/2017
9/16/2017
9/17/2017
9/18/2017
9/19/2017
9/20/2017 0.34
9/21/2017 0.00
9/22/2017
9/23/2017
9/24/2017
9/25/2017
9/26/2017
9/27/2017
9/28/2017
9/29/2017
9/30/2017



Observation Date Observation Time Precipitation Snowfall Snowfall SWE Snow Depth Snow SWE Notes
10/9/2016 9:00 AM 0.45 M M M M
10/19/2016 9:00 AM 0.00 0.0 M M M
10/24/2016 9:15 AM 0.20 M M M M
10/28/2016 9:00 AM 1.00 T T 0.0 0.00 Snow came in morning and melted on contact
10/29/2016 9:00 AM 0.00 0.0 M M M
10/30/2016 9:00 AM 0.00 0.0 M M M
10/31/2016 7:00 AM 0.54 M M M M RAINED LATE AFTERNOON TO EVENING HOURS
11/4/2016 9:00 AM 0.00 0.0 M M M
11/5/2016 9:00 AM 0.00 0.0 M M M
11/9/2016 9:00 AM 0.00 0.0 M M M
11/10/2016 9:00 AM 0.02 M M M M
11/11/2016 9:00 AM 0.00 0.0 M M M
11/15/2016 7:00 AM 0.03 M M M M Rain began overnight
11/16/2016 9:00 AM 1.03 M M M M
11/17/2016 9:00 AM 0.00 0.0 M M M
11/25/2016 9:00 AM 0.05 M M M M
11/26/2016 9:00 AM 0.00 0.0 M M M
11/30/2016 9:00 AM 1.59 M M M M Rain started at 7:45 as drizzle 11/29/16
12/1/2016 9:00 AM 0.90 M M M M
12/2/2016 9:00 AM 0.00 0.0 M M M
12/3/2016 9:00 AM T M M M M Brief sprinkle during the early evening
12/7/2016 8:30 AM 0.56 M M M M
12/12/2016 9:00 AM 0.60 M M M M
12/14/2016 9:00 AM 0.00 0.0 M M M
12/15/2016 9:00 AM T M M M M snow started in Derby 8:30am
12/17/2016 9:30 AM 0.47 4.7 M 4.7 M
12/18/2016 10:00 AM 0.34 M M M M
12/19/2016 9:00 AM 0.14 M M M M
12/21/2016 9:00 AM 0.00 0.0 M M M
12/22/2016 9:00 AM 0.00 0.0 M M M
12/23/2016 9:00 AM 0.00 0.0 M M M
12/24/2016 9:00 AM 0.25 M M M M ICY/RAIN MIX
12/29/2016 9:00 AM 0.00 0.0 M M M
12/30/2016 9:00 AM 0.52 M M M M
1/4/2017 9:00 AM 0.25 M M M M
1/5/2017 9:00 AM 0.00 0.0 M M M no precipitation
1/6/2017 9:00 AM M 1.2 M 1.2 M Light snowfall overnight; 1.25 inches of snow.
1/7/2017 9:00 AM T M M M M
1/8/2017 9:00 AM 0.50 5.0 T 5.0 T
1/10/2017 9:00 AM 0.00 0.0 M M M
1/11/2017 9:00 AM 0.40 M M M M Rain overnight 1/10/17
1/12/2017 9:00 AM 0.10 M M M M Light rain overnight.
1/13/2017 9:00 AM 0.00 0.0 M M M
1/14/2017 9:00 AM 0.00 0.0 M M M
1/15/2017 9:00 AM 1.00 M M M M Light snow overnight.
1/16/2017 9:00 AM 0.00 0.0 M M M
1/18/2017 9:00 AM 0.30 M M M M
1/19/2017 9:00 AM 0.00 0.0 M M M
1/21/2017 9:00 AM 0.03 M M M M
1/24/2017 9:00 AM 1.12 M M M M
1/25/2017 9:00 AM 0.42 M M M M
1/26/2017 9:00 AM 0.00 0.0 M M M
1/27/2017 9:00 AM T M M M M
1/28/2017 9:00 AM 0.00 0.0 M M M
1/31/2017 9:00 AM 0.00 0.0 M M M
2/1/2017 9:00 AM 0.23 2.5 M M M
2/2/2017 9:00 AM 0.00 0.0 M M M
2/3/2017 9:00 AM 0.00 0.0 M M M
2/4/2017 9:00 AM 0.00 0.0 M M M
2/6/2017 9:00 AM 0.00 0.0 M M M
2/7/2017 9:00 AM 0.03 M M M M
2/8/2017 9:00 AM 0.26 M M M M
2/11/2017 9:00 AM T M M M M slight snow over night, very dry
2/13/2017 9:00 AM 0.52 4.1 M M M
2/25/2017 9:00 AM T M M M M
2/26/2017 9:00 AM 0.76 M M M M Heavy downpour
2/28/2017 9:00 AM 0.00 0.0 M M M
3/1/2017 9:00 AM 0.00 0.0 M M M
3/2/2017 9:00 AM 0.15 M M M M
3/3/2017 9:00 AM 0.00 0.0 M M M
3/4/2017 9:00 AM 0.00 0.0 M M M
3/7/2017 9:00 AM 0.05 M M M M
3/8/2017 9:00 AM 0.10 M M M M
3/10/2017 9:30 AM 0.16 2.5 0.16 M M
3/11/2017 9:00 AM T 2.0 M 2.0 M
3/15/2017 9:00 AM T 8.5 M 8.5 M
3/17/2017 1:00 PM 0.00 0.0 M M M
3/18/2017 9:00 AM 0.00 0.0 M M M
3/29/2017 9:00 AM 0.42 M M M M
3/30/2017 9:00 AM 0.00 0.0 M M M
3/31/2017 9:00 AM 0.32 M M M M
4/1/2017 9:00 AM 1.08 M M M M
4/5/2017 9:00 AM 0.22 M M M M
4/6/2017 9:00 AM 0.23 M M M M
4/7/2017 9:00 AM 1.51 M M M M
4/11/2017 9:00 AM 0.00 0.0 M M M
4/12/2017 9:00 AM 0.00 0.0 M M M
4/20/2017 9:00 AM 0.32 M M M M
4/27/2017 9:00 AM 0.33 M M M M
5/5/2017 9:00 AM 0.06 M M M M
5/6/2017 7:00 AM 2.18 M M M M
5/14/2017 9:00 AM 1.35 M M M M
6/1/2017 2:00 PM 0.51 M M M M
6/2/2017 9:00 AM 0.00 0.0 M M M
6/3/2017 9:00 AM 0.00 0.0 M M M
6/5/2017 9:00 AM 0.37 M M M M
6/6/2017 8:30 AM 0.16 M M M M
6/7/2017 9:00 AM 0.10 M M M M
6/8/2017 9:00 AM 0.00 0.0 M M M
6/9/2017 9:00 AM 0.00 0.0 M M M
6/10/2017 9:00 AM 0.00 0.0 M M M
6/20/2017 9:00 AM 1.16 M M M M
6/24/2017 9:30 AM 0.41 M M M M
7/1/2017 9:30 AM 0.94 M M M M
7/7/2017 9:00 AM 0.20 M M M M
7/8/2017 9:00 AM 1.30 M M M M
7/11/2017 9:00 AM 0.41 0.0 0.00 0.0 0.00
7/14/2017 9:00 AM 0.41 M M M M
7/15/2017 9:00 AM 0.13 M M M M
7/24/2017 9:00 AM 0.27 M M M M
7/25/2017 7:30 AM 0.31 M M M M
7/29/2017 9:00 AM 0.00 0.0 M M M
8/3/2017 9:00 AM 0.12 M M M M
8/5/2017 9:00 AM 0.96 M M M M
8/12/2017 9:00 AM 0.37 M M M M
8/15/2017 10:00 AM 0.12 M M M M
8/23/2017 7:30 AM 0.25 M M M M
8/30/2017 9:00 AM 0.20 M M M M
9/7/2017 9:00 AM 0.61 M M M M
9/20/2017 9:00 AM 0.34 M M M M
9/21/2017 9:00 AM 0.00 0.0 M M M



Start Date End Date & Time Duration in Days Precipitation Snow Depth Snow Depth SWE Notes
10/1/2016 10/08/2016 9:00 AM 8 T M M
10/10/2016 10/18/2016 9:00 AM 9 T M M Heavy fog causing some dew accumulation
10/21/2016 10/22/2016 9:00 AM 2 0.50 M M
11/2/2016 11/03/2016 9:00 AM 2 0.00 M M
11/6/2016 11/08/2016 9:00 AM 3 0.00 M M
11/22/2016 11/24/2016 9:00 AM 3 0.00 M M
12/12/2016 12/13/2016 9:00 AM 2 0.00 M M
2/9/2017 2/10/2017 9:00 AM 2 0.85 11.2 M
2/14/2017 2/18/2017 9:00 AM 5 0.03 M M
2/22/2017 2/24/2017 9:00 AM 3 0.00 M M
3/23/2017 3/28/2017 9:00 AM 6 0.52 M M
4/3/2017 4/04/2017 9:00 AM 2 1.62 M M
4/21/2017 4/22/2017 9:00 AM 2 0.42 M M {reported 4.25" - contact observer - ms observer replied 0.42" }
4/24/2017 4/26/2017 8:00 AM 3 0.91 M M
5/2/2017 5/04/2017 9:00 AM 3 0.00 M M
5/7/2017 5/09/2017 9:00 AM 3 0.04 M M
5/9/2017 5/12/2017 9:00 AM 4 0.00 M M
5/15/2017 5/20/2017 9:00 AM 6 0.00 M M
5/22/2017 5/24/2017 9:00 AM 3 0.33 M M
5/24/2017 5/26/2017 9:00 AM 3 1.54 M M
5/29/2017 5/31/2017 9:00 AM 3 0.17 M M
6/11/2017 6/16/2017 9:00 AM 6 0.00 M M
6/16/2017 6/18/2017 9:00 AM 3 0.24 M M
6/21/2017 6/23/2017 9:00 AM 3 0.00 M M
7/9/2017 7/10/2017 9:00 AM 2 0.00 M M
7/16/2017 7/23/2017 9:00 AM 8 0.00 M M
7/26/2017 7/28/2017 9:00 AM 3 0.00 M M
7/30/2017 8/02/2017 9:00 AM 4 0.00 M M
8/6/2017 8/11/2017 9:00 AM 6 0.58 M M
8/31/2017 9/06/2017 9:00 AM 7 0.39 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