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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202404 | LHE | AR | 591 | -125 | -126 | -127 | -128 | -130 | -130 | -131 | -132 | -133 | -133 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -145 | -146 | -144 | -145 | -146 | -144 |
| 202403 | LHE | AR | 643 | -124 | -125 | -126 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -139 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -145 | -146 | -146 | -143 |
| 202402 | LHE | AR | 670 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -130 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -144 | -143 | -144 | -141 |
| 202401 | LHE | AR | 744 | -119 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -130 | -130 | -132 | -133 | -135 | -136 | -137 | -139 | -141 | -142 | -143 | -143 | -143 | -144 | -140 |
| 202312 | LHE | AR | 739 | -118 | -119 | -120 | -121 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -135 | -137 | -139 | -140 | -142 | -144 | -145 | -145 | -145 | -145 | -140 |
| 202311 | LHE | AR | 668 | -122 | -122 | -123 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -134 | -136 | -138 | -140 | -141 | -143 | -145 | -147 | -149 | -149 | -146 | -145 | -146 | -145 |
| 202310 | LHE | AR | 161 | -123 | -124 | -126 | -128 | -129 | -131 | -132 | -133 | -133 | -135 | -136 | -137 | -139 | -142 | -143 | -144 | -146 | -147 | -150 | -151 | -150 | -146 | -144 | -146 | -142 |
| 202307 | LHE | AR | 40 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 202306 | LHE | AR | 293 | -122 | -123 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -139 | -141 | -143 | -145 | -147 | -149 | -149 | -147 | -147 | -149 | -145 |
| 202305 | LHE | AR | 742 | -123 | -125 | -125 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -141 | -143 | -144 | -146 | -147 | -147 | -145 | -145 | -148 | -143 |
| 202304 | LHE | AR | 699 | -124 | -125 | -126 | -127 | -129 | -130 | -131 | -131 | -133 | -134 | -135 | -136 | -138 | -138 | -140 | -142 | -143 | -145 | -146 | -148 | -148 | -146 | -146 | -148 | -146 |
| 202303 | LHE | AR | 742 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -143 | -145 | -147 | -148 | -148 | -145 | -143 | -145 | -146 |
| 202302 | LHE | AR | 666 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -128 | -129 | -129 | -130 | -131 | -132 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -143 | -142 | -138 |
| 202301 | LHE | AR | 741 | -120 | -121 | -122 | -124 | -124 | -125 | -126 | -127 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -137 | -138 | -140 | -142 | -143 | -144 | -144 | -145 | -140 |
| 202212 | LHE | AR | 740 | -119 | -120 | -121 | -123 | -123 | -124 | -125 | -125 | -126 | -128 | -128 | -130 | -131 | -132 | -134 | -135 | -137 | -138 | -140 | -142 | -143 | -142 | -142 | -143 | -143 |
| 202211 | LHE | AR | 703 | -120 | -121 | -123 | -124 | -124 | -125 | -127 | -127 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -139 | -141 | -143 | -145 | -147 | -147 | -146 | -145 | -146 | -145 |
| 202210 | LHE | AR | 656 | -120 | -119 | -121 | -122 | -123 | -124 | -125 | -127 | -128 | -129 | -131 | -132 | -134 | -135 | -137 | -139 | -141 | -142 | -144 | -146 | -147 | -146 | -146 | -148 | -146 |
| 202209 | LHE | AR | 711 | -115 | -117 | -119 | -120 | -120 | -122 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -133 | -135 | -136 | -138 | -140 | -142 | -143 | -144 | -143 | -144 | -145 | -143 |
| 202208 | LHE | AR | 665 | -119 | -120 | -120 | -121 | -123 | -124 | -125 | -126 | -127 | -129 | -130 | -130 | -132 | -134 | -135 | -137 | -138 | -140 | -142 | -143 | -145 | -144 | -145 | -148 | -144 |
| 202207 | LHE | AR | 732 | -118 | -118 | -120 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -136 | -138 | -139 | -141 | -142 | -143 | -145 | -143 |
| 202206 | LHE | AR | 720 | -118 | -120 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -133 | -134 | -136 | -138 | -139 | -142 | -143 | -144 | -145 | -145 | -148 | -145 |
| 202205 | LHE | AR | 730 | -122 | -124 | -125 | -126 | -127 | -128 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -139 | -140 | -142 | -143 | -145 | -146 | -146 | -145 | -145 | -147 | -144 |
| 202204 | LHE | AR | 716 | -124 | -125 | -126 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -142 | -144 | -145 | -146 | -147 | -146 | -145 | -148 | -143 |
| 202203 | LHE | AR | 742 | -121 | -122 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -131 | -132 | -134 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -143 | -145 | -144 | -145 | -146 | -142 |
| 202202 | LHE | AR | 669 | -118 | -120 | -121 | -122 | -123 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -143 | -144 | -142 |
| 202201 | LHE | AR | 739 | -117 | -119 | -120 | -121 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -129 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -142 | -143 | -144 | -142 |
| 202112 | LHE | AR | 742 | -115 | -117 | -117 | -119 | -120 | -122 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -139 | -140 | -140 | -141 | -143 | -142 |
| 202111 | LHE | AR | 718 | -117 | -117 | -119 | -121 | -121 | -123 | -124 | -125 | -126 | -127 | -129 | -130 | -131 | -132 | -134 | -135 | -137 | -139 | -140 | -141 | -143 | -143 | -143 | -144 | -144 |
| 202110 | LHE | AR | 742 | -118 | -119 | -121 | -122 | -123 | -125 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -136 | -138 | -139 | -141 | -143 | -144 | -146 | -146 | -145 | -145 | -147 | -146 |
| 202109 | LHE | AR | 719 | -119 | -120 | -122 | -123 | -124 | -126 | -127 | -128 | -129 | -130 | -132 | -133 | -134 | -136 | -138 | -139 | -141 | -143 | -144 | -146 | -146 | -145 | -146 | -148 | -146 |
| 202108 | LHE | AR | 743 | -119 | -121 | -122 | -123 | -124 | -126 | -126 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -139 | -140 | -142 | -144 | -145 | -145 | -145 | -146 | -147 | -145 |
| 202107 | LHE | AR | 740 | -118 | -119 | -121 | -122 | -123 | -123 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -142 | -142 | -143 | -145 | -140 |
| 202106 | LHE | AR | 712 | -116 | -118 | -120 | -122 | -124 | -125 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -137 | -138 | -140 | -141 | -142 | -143 | -144 | -144 | -146 | -143 |
| 202105 | LHE | AR | 207 | -130 | -130 | -134 | -136 | -138 | -138 | -138 | -139 | -137 | -138 | -140 | -139 | -140 | -140 | -142 | -143 | -145 | -147 | -148 | -149 | -148 | -143 | -145 | -148 | -140 |
| 202104 | LHE | AR | 718 | -133 | -134 | -135 | -136 | -138 | -139 | -139 | -140 | -140 | -140 | -141 | -142 | -143 | -144 | -146 | -146 | -148 | -149 | -151 | -152 | -150 | -148 | -147 | -148 | -144 |
| 202103 | LHE | AR | 741 | -129 | -130 | -130 | -131 | -132 | -133 | -133 | -134 | -135 | -135 | -136 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -145 | -146 | -145 | -145 | -146 | -143 |
| 202102 | LHE | AR | 597 | -129 | -130 | -130 | -131 | -133 | -133 | -133 | -134 | -135 | -136 | -136 | -137 | -138 | -138 | -140 | -142 | -143 | -145 | -146 | -148 | -147 | -144 | -144 | -146 | -140 |
| 202101 | LHE | AR | 733 | -121 | -123 | -123 | -124 | -125 | -126 | -127 | -127 | -128 | -129 | -130 | -130 | -131 | -133 | -134 | -136 | -137 | -139 | -141 | -142 | -143 | -144 | -143 | -144 | -137 |
| 202012 | LHE | AR | 723 | -120 | -121 | -122 | -123 | -124 | -125 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -138 | -140 | -142 | -143 | -144 | -145 | -145 | -141 |
| 202011 | LHE | AR | 700 | -120 | -122 | -124 | -125 | -126 | -126 | -127 | -128 | -130 | -131 | -132 | -134 | -135 | -137 | -139 | -141 | -142 | -144 | -146 | -148 | -149 | -146 | -145 | -147 | -145 |
| 202010 | LHE | AR | 579 | -125 | -127 | -128 | -128 | -130 | -131 | -131 | -133 | -134 | -134 | -136 | -137 | -139 | -140 | -142 | -144 | -145 | -148 | -149 | -151 | -152 | -149 | -148 | -148 | -146 |
| 202009 | LHE | AR | 720 | -127 | -129 | -131 | -132 | -134 | -134 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -145 | -146 | -148 | -149 | -151 | -153 | -151 | -149 | -148 | -150 | -146 |
| 202008 | LHE | AR | 714 | -128 | -128 | -129 | -130 | -131 | -132 | -133 | -133 | -134 | -136 | -136 | -137 | -138 | -139 | -141 | -143 | -144 | -146 | -148 | -149 | -150 | -148 | -149 | -150 | -145 |
| 202007 | LHE | AR | 741 | -127 | -129 | -130 | -131 | -131 | -132 | -133 | -133 | -133 | -134 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -144 | -145 | -147 | -148 | -148 | -148 | -149 | -147 |
| 202006 | LHE | AR | 708 | -129 | -131 | -132 | -133 | -134 | -135 | -136 | -137 | -137 | -138 | -139 | -139 | -141 | -143 | -145 | -147 | -149 | -150 | -152 | -153 | -151 | -146 | -147 | -149 | -142 |
| 202005 | LHE | AR | 723 | -137 | -138 | -139 | -140 | -141 | -142 | -142 | -143 | -144 | -145 | -145 | -145 | -145 | -146 | -147 | -150 | -152 | -154 | -156 | -157 | -154 | -151 | -149 | -149 | -146 |
| 202004 | LHE | AR | 704 | -137 | -138 | -139 | -140 | -142 | -142 | -143 | -143 | -144 | -144 | -144 | -144 | -144 | -146 | -147 | -149 | -151 | -153 | -154 | -155 | -153 | -148 | -148 | -149 | -145 |
| 202003 | LHE | AR | 703 | -130 | -130 | -132 | -133 | -134 | -134 | -135 | -136 | -136 | -136 | -137 | -137 | -137 | -138 | -139 | -139 | -140 | -141 | -143 | -144 | -145 | -145 | -145 | -147 | -143 |
| 202002 | LHE | AR | 612 | -127 | -128 | -129 | -131 | -131 | -132 | -133 | -134 | -135 | -135 | -136 | -137 | -138 | -139 | -140 | -141 | -142 | -144 | -146 | -148 | -148 | -145 | -145 | -144 | -141 |
| 202001 | LHE | AR | 441 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -134 | -135 | -136 | -138 | -139 | -140 | -142 | -144 | -145 | -147 | -146 | -145 | -145 | -145 | -141 |
| 201912 | LHE | AR | 696 | -120 | -121 | -122 | -123 | -124 | -126 | -126 | -128 | -129 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -141 | -143 | -144 | -144 | -145 | -146 | -144 |
| 201911 | LHE | AR | 272 | -117 | -119 | -120 | -121 | -122 | -123 | -124 | -126 | -126 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -144 | -143 |
| 201910 | LHE | AR | 19 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |
| 201909 | LHE | AR | 484 | -118 | -119 | -121 | -121 | -122 | -124 | -125 | -126 | -127 | -128 | -129 | -130 | -132 | -133 | -134 | -135 | -137 | -138 | -140 | -142 | -142 | -143 | -143 | -146 | -145 |
| 201908 | LHE | AR | 733 | -122 | -123 | -124 | -125 | -126 | -127 | -128 | -128 | -130 | -130 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -142 | -144 | -144 | -144 | -147 | -144 |
| 201907 | LHE | AR | 727 | -119 | -120 | -122 | -123 | -123 | -124 | -125 | -126 | -127 | -128 | -128 | -129 | -130 | -131 | -132 | -133 | -134 | -135 | -137 | -138 | -139 | -140 | -142 | -143 | -141 |
| 201906 | LHE | AR | 686 | -118 | -119 | -120 | -121 | -123 | -123 | -125 | -126 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -135 | -136 | -138 | -139 | -141 | -142 | -142 | -143 | -145 | -143 |
| 201905 | LHE | AR | 625 | -126 | -127 | -129 | -130 | -131 | -132 | -133 | -134 | -136 | -136 | -137 | -138 | -139 | -140 | -141 | -143 | -145 | -147 | -148 | -149 | -146 | -145 | -145 | -147 | -140 |
| 201904 | LHE | AR | 189 | -130 | -131 | -131 | -133 | -134 | -135 | -136 | -137 | -137 | -137 | -137 | -138 | -138 | -139 | -140 | -142 | -142 | -144 | -145 | -147 | -147 | -146 | -147 | -147 | -145 |
| 201903 | LHE | AR | 625 | -125 | -127 | -128 | -129 | -130 | -131 | -132 | -133 | -133 | -133 | -134 | -135 | -135 | -136 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -143 | -144 | -146 | -142 |
| 201902 | LHE | AR | 441 | -126 | -126 | -128 | -129 | -129 | -130 | -132 | -132 | -133 | -132 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -139 | -141 | -142 | -143 | -144 | -145 | -146 | -141 |
| 201901 | LHE | AR | 463 | -121 | -124 | -125 | -126 | -126 | -128 | -129 | -130 | -131 | -132 | -132 | -133 | -134 | -135 | -136 | -136 | -138 | -139 | -141 | -142 | -144 | -144 | -146 | -145 | -142 |
| 201812 | LHE | AR | 147 | -120 | -121 | -122 | -123 | -123 | -124 | -125 | -126 | -127 | -129 | -129 | -130 | -131 | -134 | -134 | -136 | -138 | -140 | -142 | -143 | -143 | -143 | -143 | -143 | -135 |
| 201811 | LHE | AR | 121 | -127 | -127 | -129 | -129 | -131 | -132 | -133 | -134 | -134 | -134 | -135 | -135 | -136 | -137 | -138 | -140 | -140 | -141 | -143 | -145 | -145 | -145 | -145 | -146 | -144 |
| 201810 | LHE | AR | 466 | -125 | -126 | -127 | -128 | -129 | -129 | -130 | -131 | -131 | -132 | -133 | -134 | -135 | -136 | -138 | -139 | -141 | -143 | -144 | -147 | -147 | -145 | -145 | -147 | -144 |
| 201809 | LHE | AR | 600 | -129 | -131 | -133 | -133 | -134 | -136 | -136 | -136 | -137 | -138 | -137 | -139 | -140 | -141 | -142 | -144 | -145 | -147 | -148 | -149 | -148 | -146 | -146 | -147 | -143 |
| 201808 | LHE | AR | 581 | -125 | -127 | -128 | -128 | -129 | -130 | -130 | -130 | -131 | -131 | -132 | -132 | -133 | -134 | -135 | -136 | -138 | -140 | -141 | -143 | -144 | -145 | -146 | -147 | -143 |
| 201807 | LHE | AR | 632 | -126 | -127 | -128 | -129 | -129 | -130 | -131 | -131 | -131 | -132 | -133 | -133 | -134 | -135 | -136 | -137 | -138 | -140 | -141 | -143 | -144 | -144 | -145 | -147 | -141 |
| 201806 | LHE | AR | 686 | -129 | -130 | -131 | -132 | -133 | -133 | -134 | -135 | -135 | -136 | -137 | -137 | -139 | -140 | -141 | -143 | -144 | -146 | -147 | -149 | -148 | -146 | -147 | -149 | -142 |
| 201804 | LHE | AR | 495 | -132 | -135 | -137 | -137 | -139 | -140 | -140 | -140 | -141 | -140 | -141 | -141 | -142 | -143 | -145 | -147 | -148 | -150 | -151 | -152 | -152 | -149 | -147 | -149 | -148 |
| 201803 | LHE | AR | 702 | -127 | -128 | -129 | -130 | -132 | -132 | -133 | -133 | -133 | -134 | -134 | -135 | -136 | -137 | -139 | -141 | -144 | -147 | -149 | -152 | -152 | -150 | -150 | -151 | -148 |
| 201802 | LHE | AR | 60 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 | 999 |