Mt. Washington Forbush decreases YYYYMMDD % decrease (daily averages) ======================================== 19551121 3.2 19560108 13 19560302 5 19560312 4.7 19560317 3.2 19560428 4.9 19560514 4.5 19560817 3 19560831 5.8 19560922 3 19561108 7.5 19561227 4.1 19570121 15.3 19570310 8.2 19570415 9.4 19570623 4.7 19570805 7 19570829 13.7 19570922 5.2 19570929 5 19571023 9.3 19571123 8.5 19571217 6.9 19580117 5.1 19580211 5.2 19580326 7.6 19580529 4.4 19580629 3.4 19580709 6.1 19580817 5.1 19580824 5.6 19580915 4.4 19581001 3.3 19581022 5.3 19581110 3.9 19581214 3.7 19590128 3.3 19590213 8.4 19590226 4.5 19590411 3.2 19590424 3 19590512 12.8 19590711 8.7 19590715 11.6 19590717 10.7 19590820 6.5 19590904 4.3 19590919 3.8 19591203 6.4 19591222 3.3 19600113 4.3 19600330 10.6 19600430 7.5 19600509 3.9 19600524 3.4 19600530 3.5 19600606 3 19600630 6.1 19600716 3.4 19600830 3 19601007 6.1 19601025 3.6 19601116 14.2 19601227 3.1 19610217 3.2 19610413 3.7 19610712 10.6 19610718 5.9 19610727 4.6 19610930 6.6 19611029 3.1 19611201 4.4 19620422 3 19630503 3.4 19630915 3 19630922 9.4 19631028 3 19651006 3.1 19660323 5.3 19660830 7.2 19660905 3.4 19660913 4 19660924 3.7 19661214 3.1 19670113 3.9 19670502 3.1 19670526 7.5 19670607 3 19671028 5.4 19680126 4.1 19680405 4.4 19680611 4.1 19680712 4.1 19680822 3 19681001 3.7 19681028 11.1 19681117 3.8 19681206 4.9 19690228 6.6 19690317 3.3 19690324 6.8 19690413 5.3 19690428 3.1 19690514 6.1 19690609 4.9 19690928 6 19691108 4.1 19691127 3 19700128 3.7 19700404 4.1 19700606 3.7 19700617 4.8 19700724 5.2 19700816 4.8 19700909 4.3 19701106 6.5 19701111 5.7 19710127 3.2 19710416 3.3 19711007 3.6 19711121 5 19711215 5.6 19720117 3 19720309 3.2 19720517 3.9 19720617 5 19720804 18.7 19721031 7.8 19730119 3.2 19730413 4.8 19730514 3.3 19740507 5.4 19740704 5.6 19740910 6.3 19760330 7.6 19770911 3.9 19770921 5.4 19780103 4.5 19780130 3.9 19780214 12.6 19780306 7.4 19780411 3 19780418 3.6 19780430 18.1 19780529 7.5 19780603 3.3 19780625 5.6 19780713 7.2 19780826 7.2 19781110 3.9 19781221 3.3 19790223 6.2 19790328 3.4 19790424 5.8 19790606 6 19790707 7.8 19790818 7.8 19791007 5.3 19791110 5.2 19800206 5.3 19800305 3.2 19800402 6.9 19800606 7.4 19800625 4.1 19800726 3.5 19801027 3.2 19801111 4.5 19801130 8.3 19801220 3.5 19810201 6 19810224 11.3 19810327 4 19810516 6.4 19810604 3.5 19810723 9.1 19810809 4.1 19811003 4.2 19811012 5.7 19811111 3.9 19811224 3.2 19820130 8 19820211 5.1 19820228 5 19820425 3.8 19820606 9.7 19820710 25 19820808 3.7 19820905 7 19820918 9 19821124 8.1 19821210 5.1 19830110 5.1 19830204 7 19830510 3.7 19830609 3.6 19840504 5.3 19840703 5.5 19840912 5.7 19850425 6.4 19860206 9.8 19860308 3.1 19861103 4.1 19870524 2.6 19870824 4.9 19880104 4.2 19880220 5.1 19880720 2.5 19880824 4.2 19881009 3.7 19881217 4.7 19890104 5.5 19890211 4.4 19890312 15.5 19890326 3.8 19890809 3.7 19890814 5.5 19890819 4 19890828 4.9 19890904 7.2 19890906 4.2 19890918 4.2 19891020 13 19891117 4.2 19891128 16 19900318 6.6 19900407 7.7 19900517 3.9 19910130 3.5 19910312 4.8 19910324 23.5 19910424 6.6 19910528 7.5 19910604 4 19910611 11.2 19910630 7.4 19910708 5.1 19910818 5.1 19911027 10.7 19911031 6 19911107 5.5 19920225 7 19920509 5.6 19920908 4.5 19921031 3.5 19930219 4.8 19931022 4.9 19940220 3.4 19940416 5 19940617 3 19951016 3.7