The sentence "temperature has decreased" is correct and usable in written English.
You can use it when discussing weather, climate, or other environmental conditions. For example, "The temperature has decreased from 75°F to 60°F in the past hour."
Water temperatures in the stream have dropped significantly, and daily variation in temperature has decreased.
After the InAs WL growth at 500°C, a substrate temperature has decreased to 430°C under As4 irradiation.
After the InAs WL growth at 500°C, a substrate temperature has decreased to 240°C and stopped As4 supply.
For stars more massive than (13M_{odot}), helium ignites before their effective temperature has decreased to a few thousand Kelvin; the shift to the right in the HR-diagram is truncated when helium ignites.
If cementoplasty is performed in the same session with RFA, the injection should be delayed until the tumour temperature has decreased to normal levels to avoid setting the cement too quickly.
After the typhoons had passed, the water temperature had decreased from the surface to a depth of 200 m, and this decrease was attributed to upwelling occurring behind the typhoon.
During each recent cold phase, when on average global temperatures have decreased by 5C, and vast ice sheets have built up over northern high latitudes, the carbon dioxide concentration of the atmosphere dipped to about 180 parts per million.
Formation temperatures have decreased since 90 Ma, with a significant decrease since 20 Ma.
Col4a1 +/mut C. elegans reared under reduced temperatures had decreased intracellular and increased extracellular COL4A1 and COL4A2 (21).
For example, over the past 150 years, species with flowering times less responsive to warming temperatures have decreased in local abundance (Willis et al. 2008), suggesting that flowering time sensitivity is important for climate adaptation.
However, offshore waters of the North Pacific Ocean, in which Bristol Bay sockeye salmon reside during their maturation decision period, is one of the few places where temperatures have decreased slightly since the 1950s (Cane et al. 1997; Mantua 2009), inconsistent with the decreases in size at maturation observed for these fish.
