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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 202402 | LH2-00 | AR | 1 | 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 |
| 202401 | LH2-00 | AR | 713 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202312 | LH2-00 | AR | 689 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202311 | LH2-00 | AR | 607 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202310 | LH2-00 | AR | 504 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202309 | LH2-00 | AR | 689 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202308 | LH2-00 | AR | 386 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202307 | LH2-00 | AR | 744 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202306 | LH2-00 | AR | 715 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202305 | LH2-00 | AR | 697 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202304 | LH2-00 | AR | 347 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202303 | LH2-00 | AR | 743 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202302 | LH2-00 | AR | 665 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 | -10 |
| 202301 | LH2-00 | AR | 742 | -170 | -171 | -174 | -175 | -178 | -179 | -182 | -182 | -183 | -184 | -183 | -183 | -182 | -181 | -179 | -178 | -177 | -176 | -174 | -173 | -172 | -170 | -169 | -168 | -166 |
| 202212 | LH2-00 | AR | 704 | -170 | -172 | -174 | -176 | -177 | -179 | -180 | -181 | -182 | -182 | -182 | -182 | -181 | -180 | -178 | -176 | -175 | -173 | -172 | -171 | -170 | -168 | -167 | -166 | -164 |
| 202211 | LH2-00 | AR | 609 | -147 | -149 | -151 | -153 | -154 | -156 | -157 | -158 | -158 | -158 | -158 | -158 | -157 | -156 | -155 | -155 | -153 | -152 | -151 | -149 | -148 | -146 | -144 | -143 | -142 |
| 202210 | LH2-00 | AR | 690 | -136 | -139 | -140 | -142 | -144 | -146 | -148 | -149 | -151 | -151 | -152 | -153 | -154 | -154 | -153 | -153 | -153 | -152 | -152 | -152 | -151 | -150 | -150 | -150 | -148 |
| 202209 | LH2-00 | AR | 654 | -140 | -143 | -146 | -149 | -153 | -154 | -156 | -158 | -160 | -162 | -163 | -165 | -167 | -168 | -170 | -171 | -172 | -172 | -171 | -168 | -160 | -155 | -155 | -157 | -151 |
| 202208 | LH2-00 | AR | 621 | -139 | -144 | -146 | -149 | -152 | -154 | -155 | -157 | -159 | -161 | -163 | -165 | -166 | -168 | -169 | -172 | -172 | -173 | -172 | -170 | -163 | -158 | -156 | -160 | -156 |
| 202207 | LH2-00 | AR | 707 | -143 | -146 | -147 | -150 | -153 | -154 | -156 | -158 | -159 | -162 | -163 | -164 | -167 | -168 | -169 | -170 | -172 | -173 | -173 | -169 | -162 | -158 | -158 | -161 | -153 |
| 202206 | LH2-00 | AR | 713 | -142 | -143 | -144 | -145 | -146 | -145 | -144 | -144 | -144 | -144 | -145 | -146 | -147 | -149 | -150 | -152 | -153 | -153 | -153 | -151 | -143 | -138 | -137 | -139 | -136 |
| 202205 | LH2-00 | AR | 744 | -141 | -143 | -144 | -145 | -146 | -145 | -145 | -144 | -144 | -145 | -145 | -146 | -147 | -149 | -150 | -151 | -152 | -153 | -153 | -149 | -141 | -136 | -136 | -139 | -132 |
| 202204 | LH2-00 | AR | 720 | -140 | -141 | -143 | -145 | -145 | -145 | -144 | -143 | -143 | -143 | -143 | -144 | -145 | -147 | -148 | -150 | -151 | -152 | -152 | -150 | -143 | -135 | -134 | -136 | -133 |
| 202203 | LH2-00 | AR | 732 | -137 | -139 | -141 | -142 | -143 | -142 | -142 | -142 | -142 | -141 | -142 | -142 | -144 | -146 | -148 | -149 | -151 | -152 | -152 | -150 | -142 | -136 | -134 | -136 | -133 |
| 202202 | LH2-00 | AR | 572 | -137 | -139 | -140 | -141 | -142 | -141 | -141 | -141 | -141 | -141 | -142 | -143 | -144 | -146 | -148 | -149 | -151 | -152 | -151 | -146 | -137 | -132 | -133 | -135 | -125 |
| 202009 | LH2-00 | AR | 401 | -173 | -175 | -175 | -175 | -176 | -176 | -175 | -175 | -174 | -173 | -171 | -171 | -170 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 202008 | LH2-00 | AR | 726 | -140 | -143 | -146 | -149 | -153 | -155 | -156 | -158 | -159 | -162 | -164 | -165 | -166 | -168 | -170 | -171 | -172 | -173 | -173 | -172 | -165 | -159 | -158 | -161 | -157 |
| 202007 | LH2-00 | AR | 711 | -102 | -53 | -53 | -67 | -62 | -57 | -63 | -58 | -58 | -59 | -59 | -59 | -60 | -60 | -61 | -62 | -64 | -66 | -69 | -71 | -71 | -70 | -70 | -72 | -74 |
| 202006 | LH2-00 | AR | 719 | -85 | -78 | -51 | -72 | -69 | -55 | -65 | -57 | -60 | -59 | -59 | -59 | -60 | -60 | -61 | -62 | -64 | -67 | -70 | -71 | -70 | -69 | -71 | -73 | -74 |
| 202005 | LH2-00 | AR | 738 | -64 | -104 | -49 | -75 | -66 | -55 | -64 | -57 | -62 | -58 | -58 | -59 | -60 | -61 | -62 | -63 | -65 | -68 | -71 | -71 | -70 | -70 | -72 | -73 | -74 |
| 202004 | LH2-00 | AR | 713 | -174 | -175 | -176 | -176 | -177 | -176 | -176 | -175 | -174 | -173 | -172 | -171 | -170 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 202003 | LH2-00 | AR | 739 | -176 | -178 | -179 | -179 | -178 | -178 | -177 | -176 | -175 | -174 | -173 | -172 | -171 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 202002 | LH2-00 | AR | 695 | -177 | -177 | -178 | -178 | -178 | -178 | -177 | -176 | -175 | -174 | -173 | -171 | -170 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 202001 | LH2-00 | AR | 736 | -175 | -176 | -177 | -178 | -177 | -177 | -176 | -175 | -175 | -174 | -172 | -171 | -170 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 201912 | LH2-00 | AR | 743 | -176 | -177 | -178 | -178 | -178 | -178 | -177 | -176 | -175 | -174 | -173 | -172 | -171 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 201911 | LH2-00 | AR | 651 | -176 | -176 | -177 | -178 | -178 | -178 | -176 | -176 | -175 | -174 | -173 | -172 | -171 | -169 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 201910 | LH2-00 | AR | 618 | -175 | -176 | -178 | -177 | -177 | -177 | -177 | -176 | -175 | -174 | -173 | -172 | -171 | -170 | -168 | -167 | -166 | -165 | -164 | -163 | -162 | -161 | -160 | -159 | -158 |
| 201909 | LH2-00 | AR | 579 | -172 | -173 | -174 | -175 | -175 | -175 | -175 | -174 | -173 | -172 | -172 | -171 | -169 | -169 | -169 | -170 | -170 | -172 | -172 | -167 | -162 | -161 | -160 | -159 | -158 |
| 201908 | LH2-00 | AR | 695 | -140 | -144 | -147 | -149 | -154 | -156 | -156 | -158 | -160 | -161 | -164 | -165 | -167 | -168 | -169 | -171 | -172 | -173 | -174 | -171 | -162 | -157 | -157 | -160 | -155 |
| 201907 | LH2-00 | AR | 739 | -142 | -146 | -147 | -150 | -154 | -155 | -156 | -158 | -159 | -160 | -162 | -164 | -165 | -166 | -168 | -169 | -170 | -171 | -171 | -169 | -162 | -156 | -156 | -160 | -156 |
| 201906 | LH2-00 | AR | 679 | -142 | -144 | -147 | -149 | -152 | -153 | -155 | -156 | -157 | -159 | -160 | -162 | -163 | -165 | -166 | -168 | -169 | -170 | -171 | -169 | -162 | -157 | -157 | -159 | -155 |
| 201905 | LH2-00 | AR | 743 | -140 | -142 | -145 | -147 | -150 | -152 | -154 | -155 | -157 | -158 | -159 | -160 | -162 | -163 | -164 | -166 | -167 | -169 | -169 | -167 | -159 | -154 | -154 | -158 | -150 |
| 201904 | LH2-00 | AR | 710 | -138 | -141 | -144 | -148 | -151 | -153 | -155 | -156 | -157 | -159 | -160 | -162 | -164 | -164 | -166 | -168 | -170 | -171 | -171 | -169 | -162 | -156 | -155 | -158 | -156 |
| 201903 | LH2-00 | AR | 741 | -139 | -142 | -146 | -149 | -151 | -153 | -155 | -156 | -157 | -158 | -160 | -162 | -163 | -165 | -166 | -168 | -170 | -171 | -171 | -168 | -160 | -154 | -154 | -156 | -150 |
| 201902 | LH2-00 | AR | 668 | -136 | -138 | -141 | -144 | -147 | -150 | -152 | -153 | -155 | -156 | -158 | -160 | -161 | -163 | -165 | -167 | -169 | -170 | -171 | -167 | -159 | -154 | -153 | -156 | -149 |
| 201901 | LH2-00 | AR | 743 | -139 | -141 | -144 | -147 | -149 | -150 | -153 | -153 | -155 | -156 | -157 | -158 | -160 | -162 | -163 | -167 | -168 | -170 | -170 | -169 | -161 | -154 | -153 | -155 | -149 |
| 201812 | LH2-00 | AR | 743 | -139 | -141 | -143 | -146 | -149 | -150 | -152 | -153 | -154 | -155 | -156 | -158 | -159 | -161 | -163 | -166 | -168 | -169 | -169 | -166 | -158 | -154 | -153 | -153 | -146 |
| 201811 | LH2-00 | AR | 717 | -140 | -143 | -146 | -150 | -153 | -154 | -156 | -157 | -158 | -159 | -160 | -162 | -164 | -165 | -167 | -169 | -170 | -172 | -172 | -169 | -161 | -156 | -153 | -155 | -154 |
| 201810 | LH2-00 | AR | 716 | -140 | -144 | -146 | -149 | -153 | -154 | -156 | -157 | -159 | -160 | -161 | -162 | -164 | -166 | -168 | -169 | -170 | -171 | -171 | -168 | -160 | -154 | -154 | -155 | -150 |
| 201809 | LH2-00 | AR | 718 | -140 | -144 | -147 | -150 | -153 | -155 | -157 | -158 | -160 | -161 | -162 | -164 | -166 | -167 | -169 | -170 | -171 | -172 | -172 | -168 | -161 | -156 | -156 | -158 | -151 |
| 201808 | LH2-00 | AR | 727 | -139 | -143 | -145 | -149 | -152 | -154 | -155 | -157 | -158 | -160 | -161 | -162 | -164 | -166 | -168 | -169 | -171 | -171 | -172 | -170 | -164 | -159 | -158 | -160 | -157 |
| 201807 | LH2-00 | AR | 742 | -94 | -96 | -97 | -99 | -101 | -101 | -102 | -102 | -103 | -103 | -104 | -106 | -106 | -107 | -109 | -110 | -110 | -112 | -114 | -115 | -116 | -118 | -119 | -120 | -121 |
| 201806 | LH2-00 | AR | 717 | -106 | -108 | -110 | -111 | -113 | -113 | -113 | -114 | -115 | -116 | -116 | -117 | -118 | -119 | -119 | -120 | -122 | -123 | -124 | -125 | -127 | -128 | -130 | -131 | -131 |
| 201805 | LH2-00 | AR | 743 | -100 | -102 | -103 | -105 | -106 | -107 | -107 | -107 | -108 | -109 | -110 | -111 | -113 | -114 | -116 | -119 | -121 | -123 | -125 | -127 | -129 | -131 | -132 | -134 | -134 |
| 201804 | LH2-00 | AR | 720 | -96 | -98 | -99 | -101 | -102 | -103 | -104 | -105 | -106 | -107 | -109 | -111 | -112 | -114 | -116 | -118 | -120 | -122 | -124 | -126 | -128 | -130 | -132 | -134 | -135 |
| 201803 | LH2-00 | AR | 741 | -97 | -99 | -100 | -103 | -105 | -106 | -108 | -109 | -110 | -112 | -114 | -116 | -118 | -121 | -123 | -125 | -127 | -129 | -132 | -134 | -136 | -138 | -140 | -142 | -142 |
| 201802 | LH2-00 | AR | 64 | 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 |