Noise Levels at Different Periods
The table below gives the decibel 10% noise level (in db) for each month in
several period bands. The 10% noise level is defined as the signal
level not exceeded 10% of the time, based on hourly measurements. Each entry in the
table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db
Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.
| Month | Chan. | Qual. | # obs. | 518s | 439s | 373s | 316s | 268s | 228s | 193s | 164s | 139s | 118s | 100s | 85s | 72s | 61s | 52s | 44s | 37s | 32s | 27s | 23s | 19s | 16s | 14s | 12s | 10s |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202105 | LHZ | AR | 666 | -130 | -130 | -131 | -131 | -132 | -132 | -132 | -131 | -131 | -130 | -128 | -128 | -130 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -145 |
| 202104 | LHZ | AR | 718 | -130 | -130 | -131 | -132 | -132 | -132 | -132 | -132 | -131 | -129 | -128 | -128 | -130 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -145 |
| 202103 | LHZ | AR | 269 | -130 | -130 | -131 | -131 | -131 | -132 | -132 | -131 | -131 | -129 | -127 | -128 | -130 | -132 | -133 | -134 | -135 | -135 | -136 | -138 | -140 | -141 | -142 | -144 | -145 |
| 202101 | LHZ | AR | 122 | -129 | -131 | -131 | -131 | -131 | -131 | -130 | -131 | -131 | -130 | -129 | -129 | -130 | -131 | -133 | -134 | -134 | -135 | -137 | -138 | -139 | -140 | -142 | -142 | -133 |
| 202012 | LHZ | AR | 743 | -131 | -132 | -133 | -133 | -133 | -133 | -134 | -133 | -132 | -131 | -130 | -129 | -131 | -132 | -134 | -135 | -136 | -136 | -138 | -139 | -140 | -141 | -142 | -143 | -142 |
| 202011 | LHZ | AR | 717 | -132 | -132 | -133 | -133 | -133 | -134 | -134 | -133 | -132 | -131 | -130 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -141 | -142 | -144 | -145 |
| 202010 | LHZ | AR | 740 | -132 | -132 | -133 | -133 | -134 | -134 | -134 | -133 | -133 | -132 | -131 | -130 | -131 | -133 | -134 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -145 | -146 |
| 202009 | LHZ | AR | 665 | -130 | -131 | -133 | -133 | -134 | -134 | -134 | -133 | -133 | -132 | -130 | -130 | -131 | -133 | -134 | -135 | -136 | -137 | -137 | -139 | -140 | -141 | -142 | -144 | -145 |
| 202008 | LHZ | AR | 611 | -130 | -132 | -132 | -133 | -133 | -134 | -135 | -134 | -133 | -132 | -131 | -130 | -132 | -134 | -135 | -136 | -137 | -137 | -139 | -140 | -141 | -142 | -144 | -145 | -147 |
| 202007 | LHZ | AR | 741 | -131 | -132 | -132 | -133 | -134 | -134 | -134 | -133 | -133 | -132 | -131 | -130 | -132 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -144 | -146 | -147 |
| 202006 | LHZ | AR | 691 | -132 | -132 | -132 | -133 | -133 | -134 | -134 | -134 | -134 | -133 | -131 | -131 | -132 | -134 | -135 | -136 | -137 | -137 | -139 | -140 | -141 | -142 | -144 | -146 | -147 |
| 202005 | LHZ | AR | 743 | -131 | -131 | -132 | -132 | -132 | -132 | -132 | -132 | -131 | -130 | -128 | -128 | -130 | -132 | -133 | -134 | -135 | -135 | -137 | -138 | -139 | -141 | -142 | -144 | -145 |
| 202004 | LHZ | AR | 719 | -132 | -132 | -133 | -133 | -134 | -134 | -135 | -134 | -133 | -131 | -128 | -128 | -131 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -142 | -143 | -145 | -146 |
| 202003 | LHZ | AR | 744 | -132 | -132 | -133 | -133 | -134 | -134 | -134 | -133 | -133 | -130 | -128 | -129 | -131 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -142 | -143 | -145 | -146 |
| 202002 | LHZ | AR | 686 | -131 | -132 | -132 | -133 | -133 | -134 | -134 | -133 | -132 | -130 | -127 | -128 | -131 | -132 | -134 | -135 | -135 | -135 | -137 | -138 | -139 | -141 | -142 | -144 | -145 |
| 202001 | LHZ | AR | 743 | -132 | -132 | -133 | -134 | -133 | -134 | -133 | -133 | -132 | -130 | -129 | -129 | -131 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -141 | -142 | -144 | -143 |
| 201912 | LHZ | AR | 744 | -132 | -133 | -133 | -133 | -134 | -134 | -134 | -133 | -132 | -130 | -128 | -129 | -131 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -141 | -142 | -143 | -143 |
| 201911 | LHZ | AR | 719 | -132 | -132 | -133 | -133 | -133 | -134 | -134 | -134 | -132 | -130 | -128 | -128 | -131 | -133 | -134 | -135 | -136 | -136 | -136 | -139 | -140 | -141 | -142 | -144 | -144 |
| 201910 | LHZ | AR | 741 | -130 | -130 | -132 | -132 | -133 | -133 | -133 | -132 | -131 | -129 | -127 | -128 | -130 | -132 | -133 | -134 | -135 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -144 |
| 201909 | LHZ | AR | 710 | -125 | -126 | -125 | -126 | -125 | -125 | -126 | -126 | -126 | -125 | -125 | -123 | -125 | -128 | -131 | -131 | -131 | -133 | -133 | -136 | -137 | -138 | -140 | -142 | -143 |
| 201908 | LHZ | AR | 739 | -125 | -125 | -125 | -125 | -125 | -125 | -125 | -125 | -125 | -125 | -125 | -124 | -125 | -129 | -131 | -131 | -131 | -133 | -133 | -136 | -137 | -139 | -140 | -142 | -144 |
| 201907 | LHZ | AR | 742 | -125 | -125 | -126 | -125 | -125 | -125 | -126 | -126 | -126 | -125 | -126 | -124 | -125 | -129 | -131 | -131 | -131 | -134 | -134 | -137 | -138 | -139 | -141 | -143 | -144 |
| 201906 | LHZ | AR | 713 | -124 | -125 | -125 | -125 | -125 | -125 | -126 | -126 | -125 | -125 | -125 | -124 | -125 | -129 | -131 | -131 | -131 | -133 | -133 | -136 | -137 | -138 | -140 | -142 | -144 |
| 201905 | LHZ | AR | 741 | -125 | -125 | -125 | -125 | -125 | -125 | -126 | -126 | -126 | -126 | -125 | -124 | -125 | -128 | -131 | -131 | -131 | -133 | -133 | -136 | -137 | -138 | -140 | -142 | -143 |
| 201904 | LHZ | AR | 720 | -125 | -125 | -125 | -125 | -125 | -125 | -126 | -127 | -126 | -125 | -125 | -124 | -124 | -128 | -130 | -131 | -130 | -133 | -133 | -135 | -136 | -138 | -140 | -142 | -143 |
| 201903 | LHZ | AR | 741 | -125 | -126 | -126 | -126 | -126 | -126 | -127 | -126 | -126 | -126 | -126 | -124 | -125 | -128 | -131 | -131 | -131 | -133 | -133 | -136 | -137 | -138 | -139 | -141 | -143 |
| 201902 | LHZ | AR | 669 | -125 | -125 | -125 | -126 | -126 | -125 | -126 | -126 | -126 | -125 | -126 | -125 | -126 | -130 | -131 | -132 | -132 | -134 | -133 | -136 | -137 | -138 | -140 | -142 | -142 |
| 201901 | LHZ | AR | 741 | -125 | -125 | -125 | -125 | -125 | -125 | -126 | -126 | -126 | -126 | -126 | -125 | -125 | -128 | -131 | -131 | -131 | -134 | -133 | -136 | -137 | -138 | -140 | -142 | -143 |
| 201812 | LHZ | AR | 723 | -125 | -126 | -126 | -126 | -126 | -126 | -126 | -127 | -127 | -126 | -126 | -125 | -126 | -129 | -132 | -132 | -132 | -134 | -134 | -136 | -137 | -139 | -140 | -141 | -141 |
| 201811 | LHZ | AR | 710 | -131 | -131 | -131 | -133 | -132 | -133 | -133 | -132 | -131 | -130 | -129 | -130 | -132 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -141 | -143 | -144 | -145 |
| 201810 | LHZ | AR | 722 | -132 | -132 | -133 | -134 | -134 | -134 | -134 | -133 | -133 | -130 | -129 | -129 | -132 | -134 | -135 | -136 | -136 | -137 | -137 | -139 | -141 | -142 | -143 | -144 | -145 |
| 201809 | LHZ | AR | 682 | -132 | -132 | -134 | -134 | -134 | -134 | -134 | -133 | -132 | -130 | -129 | -130 | -133 | -134 | -135 | -136 | -137 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -147 |
| 201808 | LHZ | AR | 708 | -133 | -133 | -134 | -134 | -134 | -134 | -134 | -133 | -133 | -131 | -130 | -131 | -133 | -135 | -136 | -136 | -137 | -137 | -138 | -140 | -141 | -143 | -145 | -146 | -148 |
| 201807 | LHZ | AR | 690 | -132 | -133 | -133 | -134 | -134 | -134 | -134 | -133 | -132 | -130 | -129 | -131 | -133 | -134 | -136 | -137 | -137 | -137 | -138 | -140 | -141 | -143 | -144 | -146 | -147 |
| 201806 | LHZ | AR | 709 | -131 | -132 | -133 | -134 | -134 | -134 | -134 | -133 | -132 | -130 | -129 | -130 | -132 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -140 | -142 | -144 | -145 | -147 |
| 201805 | LHZ | AR | 734 | -132 | -133 | -134 | -133 | -135 | -135 | -135 | -134 | -132 | -130 | -129 | -130 | -132 | -134 | -135 | -136 | -136 | -137 | -137 | -139 | -140 | -142 | -144 | -145 | -146 |
| 201804 | LHZ | AR | 715 | -131 | -133 | -133 | -133 | -134 | -134 | -134 | -133 | -132 | -130 | -129 | -129 | -132 | -134 | -135 | -136 | -136 | -136 | -137 | -139 | -140 | -141 | -143 | -145 | -146 |
| 201803 | LHZ | AR | 744 | -131 | -132 | -133 | -133 | -133 | -134 | -134 | -133 | -132 | -130 | -129 | -130 | -132 | -134 | -135 | -136 | -136 | -137 | -138 | -139 | -140 | -142 | -143 | -144 | -145 |
| 201802 | LHZ | AR | 640 | -131 | -132 | -132 | -133 | -133 | -133 | -134 | -133 | -132 | -129 | -128 | -129 | -132 | -133 | -134 | -135 | -136 | -136 | -137 | -139 | -140 | -141 | -142 | -144 | -145 |
| 201801 | LHZ | AR | 725 | -133 | -133 | -134 | -134 | -134 | -135 | -134 | -133 | -133 | -131 | -130 | -130 | -133 | -135 | -135 | -136 | -137 | -137 | -138 | -140 | -141 | -142 | -143 | -145 | -144 |