Reference
Glossaries and Codes
World Meteorological Organization (WMO) International Cloud Atlas
American Meteorological Society (AMS) Glossary - with 12,000+ terms
US National Weather Service Glossary - NOAA
SYNOP code - interpretation guide, including present weather codes and cloud type codes
Surface Weather Plot Symbols - NOAA
Temperature, Dewpoint or Relative Humidity calculator
NZ Publications
MetService Blog
NIWA publications
Te Ara: Encyclopedia of NZ - Climate and Atmosphere
Maps
World Map at Weather Geek - simple Leaflet-based map, with lat/long readout and boundary overlays
NZ Topo Map (topomap.co.nz) - with a nice search and coord tool
LINZ Topographic Maps - including 1:250,000 and 1:50,000 scale maps of New Zealand
Koordinates - a wealth of GIS map data for overlay on a Google Map with free downloads
NZ Council maps - via LGNZ
NZ Mountain Passes and Roads map containing markers and summit heights via Weather Geek
Map Tools
Draw circles on a map
Earth curve calculator
The True Size of - compare country sizes for fun
Convert Lat/Long in Deg/Min/Sec to/from Decimal - via US FCC