Global temperature, Sep 1917

Global anomaly−0.23°C1951–1980

Rank among all Seps119 / 146warmest first

N. Hemisphere−0.31°C

S. Hemisphere−0.17°C

vs same month last year+0.13°C

CO₂ (Mauna Loa)–

All months of 1917

Jan−0.57°C

Feb−0.63°C

Mar−0.63°C

Apr−0.55°C

May−0.56°C

Jun−0.44°C

Jul−0.26°C

Aug−0.23°C

Sep ◀−0.23°C

Oct−0.45°C

Nov−0.34°C

Dec−0.68°C

This month−0.23°C

Same month, previous year−0.36°C

Same month 10 years earlier−0.34°C

Sep average 1991–2020+0.58°C

Warmest Sep on record (2023)+1.48°C

Year	Global	NH	SH	Rank
1907	−0.34°C	−0.40°C	−0.29°C	135
1908	−0.36°C	−0.31°C	−0.42°C	139
1909	−0.39°C	−0.38°C	−0.42°C	142
1910	−0.39°C	−0.43°C	−0.35°C	141
1911	−0.41°C	−0.39°C	−0.44°C	143
1912	−0.58°C	−0.81°C	−0.34°C	146
1913	−0.35°C	−0.43°C	−0.27°C	137
1914	−0.18°C	−0.31°C	−0.05°C	106
1915	−0.21°C	−0.21°C	−0.20°C	114
1916	−0.36°C	−0.49°C	−0.25°C	138
1917	−0.23°C	−0.31°C	−0.17°C	119
1918	−0.17°C	−0.25°C	−0.10°C	104
1919	−0.25°C	−0.19°C	−0.32°C	124
1920	−0.22°C	−0.35°C	−0.08°C	115
1921	−0.19°C	−0.18°C	−0.19°C	109
1922	−0.35°C	−0.42°C	−0.29°C	136
1923	−0.31°C	−0.17°C	−0.43°C	133
1924	−0.32°C	−0.22°C	−0.41°C	134
1925	−0.20°C	−0.05°C	−0.33°C	111
1926	−0.14°C	−0.03°C	−0.23°C	96
1927	−0.12°C	+0.03°C	−0.27°C	91

Rank 1340 of all 1760 months on record. Temperatures are anomalies vs the 1951–1980 average (NASA GISTEMP v4); values can be revised later.