Tolkien used very similar forms for Elvish words for “cold” for all of his life. The earliest iteration of this root was unglossed ᴱ√RIŊI in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. rin (ring-) “dew” and ᴱQ. ringa “damp, cold, chilly” (QL/80). The root had similar derivatives in the contemporaneous Gnomish Lexicon such as G. rî “coolness, cool” and G. ring “cool, cold” (GL/65). In The Etymologies of the 1930s Tolkien gave the root {ᴹ√RINGĀ >>} ᴹ√RINGI “cold” with derivatives like ᴹQ. ringe/N. rhing “cold” (Ety/RINGI; EtyAC/RINGI). Primitive forms ✶riñgi “chill” and ✶riñgā appeared in Common Eldarin: Noun Structure from the early 1950s (PE21/80), and Christopher Tolkien mentioned √ring as the basis for cold words in the Silmarillion Appendix (SA/ring).
Primitive elvish
srith
root. snow
aba-kar ā
don’t do it
issa
pronoun. it (emphatic)
kenásĭta
adverb. if it be so, may be, perhaps
lasa
adverb. not it = it is/was not so
eke
root. it is open
kheru
verb. lord it over, be master of, own
lāni/lanjē karnē-sa
I did not do it
¤kurwē
noun. power, ability
sris
root. snow
ringi
root. cold
lā-
verb. to not be
eñ-
verb. to exist
imin
masculine name. One
lossē
noun. snow
manā
adjective. what
mat-
verb. to eat
min
cardinal. one
ndab
root. to judge
ortā-
verb. to raise
ros-
verb. to rain
san-
pronoun. that
tul-
verb. come, is coming, has come, is here, I come, have come
us(u)kwē
noun. dusk
karandi
noun. making
rossētā-
verb. to rain
An apparently verbal root as √SRIS “snow” appearing in etymological notes from around 1959 with derivatives like Q. hrisse “fall of snow” and Q. hríza “it is snowing”; it replaced a deleted root √SRITH “snow” (PE17/168).