The Collaborative International Dictionary of English v.0.48:

Northerly \North"er*ly\, a.
   Of or pertaining to the north; toward the north, or from the
   north; northern.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Northerly \North"er*ly\, adv.
   Toward the north.
   [1913 Webster]

WordNet (r) 3.0 (2006):

northerly
    adv 1: in a northern direction; "they earn more up north";
           "Let's go north!" [syn: north, northerly,
           northwards, northward]
    adj 1: situated in or oriented toward the north; "the northern
           suburbs"; "going in a northerly direction" [syn:
           northerly, northern]
    2: coming from the north; used especially of wind; "the north
       wind doth blow"; "a northern snowstorm"; "the winds are
       northerly" [syn: northerly, northern]
    n 1: a wind that blows from the north [syn: north wind,
         northerly, norther, boreas]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "northerly":
   N, antarctic, arctic, austral, boreal, east, eastbound, easterly,
   eastermost, eastern, easternmost, hyperborean, meridional, north,
   north about, northbound, northeast, northeasterly, northeastern,
   northern, northernmost, northward, northwardly, northwards,
   northwest, northwesterly, northwestern, norward, occidental,
   oriental, south, southbound, southeast, southeasterly,
   southeastern, southerly, southern, southernmost, southwest,
   southwesterly, southwestern, west, westbound, westerly, western,
   westernmost