hygrometer

Hygrometers, and Atmospheric Humidity
Measurement and Units


Below are checklists of hygrometers, and atmospheric humidity measurement and units. on postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). Catalog numbers, years of issue, and notes on the items featured are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.

See also Station models (including plotted dew point temperatures1) on the Weather Maps page:

The Atmospheric Water Cycle page includes some items depicting or referring to water vapour, evaporation and atmospheric humidity as part of the water cycle.

Sections/divisions of the table below
Hygrometers (and other humidity sensors)
Atmospheric humidity measurement and units (no hygrometers depicted)

CountryCatalog NumberType of ItemYear of IssueNotes on Content
Hygrometers (and other humidity sensors)
British Antarctic Territory319 (Mi345)2002Four thermometers (minimum, maximum, dry, wet-bulb2) and thermograph in open instrument shelter
Denmark489 fdc (Mi521 fdc)(Frimaerke Nyt nr.169) cachet on FDC1972Two thermometers (dry and wet-bulb2)
FranceNoneCachet on commercial cover1995"hygromètre"
Gilbert and Ellice Islands218 (Mi213)1973Four thermometers (minimum, maximum, dry, wet-bulb2) and thermograph in open instrument shelter
Namibia692 (Mi700)1991Four thermometers (minimum, maximum, dry, wet-bulb2) in open instrument shelter; also "thermohygrograph" (in insert text)
Namibia690-693 fdc1One of four stamps on FDC, also insert
Namibia690-693 fdc2One of four stamps on FDC (different)
South Africa610-613 fdc1 (Mi626-629 fdc1)Cancel on FDC1983Four thermometers (minimum, maximum, dry, wet-bulb2) in open instrument shelter
South Africa610-613 fdc2 (Mi626-629 fdc2)Cancel (same) on FDC (different)
Uganda1200 (BL207)In (upper-left) margin of SS11994hygrometer
Atmospheric humidity measurement and units (no hygrometers depicted)
Canada1287 (Mi1196)1990Surface weather station plotting model:
temperature (26°C) and dew point temperature (14°C)1;
pressure (1012.7 hPa) and pressure tendency (falling 0.7 hPa in the past 3 hours, then steady);
wind (20 knots) from the southwest;
and other weather quantities
Canada1287 fdc1Stamp on FDC (Canada Post Corp. cachet)
Canada1287 fdc2Stamp on FDC (? cachet)
Canada1287 fdc3Stamp on FDC (? cachet, same, and signatures), also English insert and French insert
Canada1287 fdc4Stamp on FDC (Colorano silk cachet)
China (People's Republic)367-369 fdc (Mi395-397 fdc)Cachet on FDC1958Surface weather station plotting model:
temperature (12°C) and dew point temperature (4°C)1;
pressure (997.3 hPa) and pressure tendency (falling 1.2 hPa in the past 3 hours);
wind (25 knots) from the southwest;
and other weather quantities
China (People's Republic)NoneCancel on postal card, with detail same as cachet on PRC 367-369 fdc2010Surface weather station plotting model:
temperature (12°C) and dew point temperature (4°C)1;
pressure (997.3 hPa) and pressure tendency (falling 1.2 hPa in the past 3 hours);
wind (25 knots) from the southwest;
and other weather quantities
Germany2090 (Mi2127)2000Isobars (mb or hPa)1, (warm, cold, and occluded) fronts, and full station plotting model including winds (knots), temperatures and dew point temperatures (°C)1
Germany2090 fdcStamp on FDC
Germany2090 scSouvenir card
Japan2698d (Mi3008)One of MS10 (2698 (a-j)) (Mi3005-3014)2000Isobars (mb or hPa)1, hurricane/typhoon symbol, and plotting model with temperatures and dew point temperatures (°C)1, non-standard7 plotted winds (knots), and pressures (mb or hPa)1
Japan2698d-e+2698g-h fdcOne of four stamps and (?) cachet (with design like stamp) on FDC
Jersey (Great Britain)1299 (Mi1330)2008Surface weather station plotting model:
temperature (12°C) and dew point temperature (11°C)1;
pressure (1016.4 hPa), pressure change (falling 0.5 hPa in the past 3 hours);
wind (25 knots) from the northeast;
and other weather quantities
Jersey (Great Britain)1299a (BL?)MS10 (10x 1299)
Jersey (Great Britain)1297-1301 fdcOne of five stamps on FDC, also back
NetherlandsB652 (Mi1381)One of book of 4 (B652a (B650-B651 + 2x B652)) (MH41 (1379C+1380D+1381D-E)), with interior, also detail1990Synoptic code message from DeBilt, Netherlands: temperature (12.9°C) and dew point temperature (8.9°C)1
NetherlandsB652 fdcStamp on FDC
NetherlandsB650-B652 fdcTwo of three stamps on FDC

1Dew point temperature (although given in temperature units) is a measure of humidity in the atmosphere.
2The reading of the wet bulb thermometer is combined with the reading of the dry bulb thermometer to calculate the humidity.


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