Excessive latency/jitter

For the past few weeks, I've had unstable latency and jitter in the evening time. Mornings are fine, so its seems like a congestion issue. See examples below:

Morning (9:00AM)

Google.com

Ping statistics for 216.58.194.174:
Packets: Sent = 50, Received = 50, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 32ms, Maximum = 36ms, Average = 33ms

Evening (6:45PM)

Google.com

Ping statistics for 216.58.194.174:
Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 34ms, Maximum = 211ms, Average = 60ms

Comcast.com

Ping statistics for 69.252.80.75:
Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 48ms, Maximum = 161ms, Average = 88ms

Tracing route to google.com [172.217.3.174]
over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms RT-AC66U_B1-0DA0 [192.168.50.1]
2 45 ms 66 ms 17 ms 96.120.102.141
3 52 ms 33 ms 42 ms 96.110.248.189
4 17 ms 36 ms 51 ms be-101-ar01.seattle.wa.seattle.comcast.net [68.86.96.89]
5 76 ms 23 ms 38 ms be-33650-cr01.seattle.wa.ibone.comcast.net [68.86.93.165]
6 14 ms 19 ms 26 ms be-2211-pe11.seattle.wa.ibone.comcast.net [96.110.32.230]
7 64 ms 21 ms 14 ms 50.208.232.242
8 18 ms 17 ms 15 ms 108.170.233.131
9 35 ms 34 ms 21 ms 108.170.233.157
10 51 ms 119 ms 53 ms sea15s11-in-f14.1e100.net [172.217.3.174]

Latency starts on first hop outside my home network; I have tried connecting directly to my modem with the same results as well. I've checked my modem signal levels and those are within range, too. Any help here is much appreciated.