Fergus County climate

Fergus County Weather in May

NOAA 1991-2020 normals for Lewistown 11ESE, 28.6 km from Fergus County

Average highs run from 54°F on May 1 to 63°F on May 31, and lows from 33°F to 43°F. Normal precipitation for the month is 3.78 in.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Fergus County, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
59°F
Average low
38°F
Precipitation
3.78 in
Snowfall
0.6 in
Record high
98°FMay 14, 1931
Record low
11°FMay 6, 1929
Chance of a freeze
97%
Daylight
14 h 28 min to 15 h 40 min
Cloud cover
67%
Humidity
56%
Dew point
37°F
Wind
11.0 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
May 154°F33°F82°F 200013°F 20132%
May 254°F33°F86°F 198514°F 19542%
May 354°F34°F82°F 191816°F 19542%
May 455°F34°F84°F 191816°F 19672%
May 555°F34°F85°F 193421°F 19132%
May 656°F35°F85°F 192811°F 19292%
May 756°F35°F89°F 190823°F 19292%
May 856°F35°F85°F 192819°F 19292%
May 957°F36°F84°F 190616°F 20022%
May 1057°F36°F88°F 190611°F 19462%
May 1157°F36°F86°F 199319°F 19532%
May 1258°F37°F88°F 200119°F 19162%
May 1358°F37°F88°F 190315°F 19532%
May 1458°F37°F98°F 193125°F 19162%
May 1559°F38°F87°F 193112°F 19102%
May 1659°F38°F87°F 190126°F 18961%
May 1759°F38°F87°F 194827°F 19161%
May 1859°F39°F86°F 193723°F 19291%
May 1960°F39°F87°F 195425°F 19031%
May 2060°F40°F88°F 192523°F 19311%
May 2160°F40°F89°F 192824°F 19311%
May 2261°F40°F93°F 192824°F 19101%
May 2361°F40°F87°F 192817°F 19301%
May 2461°F41°F88°F 192929°F 19931%
May 2561°F41°F92°F 192826°F 20041%
May 2662°F41°F90°F 193626°F 19751%
May 2762°F42°F91°F 191923°F 19101%
May 2862°F42°F93°F 191915°F 19471%
May 2962°F42°F92°F 193627°F 19291%
May 3063°F43°F92°F 193630°F 19241%
May 3163°F43°F87°F 193624°F 19821%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Fergus County, in percent, and of at least 0.1 inch of snowfall.00.511.522.51102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

May 1
sunrise 6:00 AM, sunset 8:28 PM
May 31
sunrise 5:25 AM, sunset 9:05 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00244979 (Lewistown 11ESE), public domain. Records: NOAA GHCN-Daily, station USW00024036, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.