Weather Almanac: Casper, WY 82609

🗓️ Historical norms for May 2026

May avg. precipitation
🌧️ 2.32"
May days below freezing
📉 ≈3.1 days
Average May lows ≈41.0°F
USDA Zone
5a
Annual extreme lows -20°F to -15°F
Last Spring Frost (36°F)
🌷 Jun 12
First Fall Frost (36°F)
🍂 Sep 9
Fri. May 1 🌕

🌅 5:58 a.m.

H: ≈62.3°F

L: ≈35.8°F

🌇 8:05 p.m.

Sat. May 2  

🌅 5:57 a.m.

H: ≈62.7°F

L: ≈36.1°F

🌇 8:06 p.m.

Sun. May 3  

🌅 5:56 a.m.

H: ≈63.0°F

L: ≈36.5°F

🌇 8:07 p.m.

Mon. May 4  

🌅 5:54 a.m.

H: ≈63.4°F

L: ≈36.8°F

🌇 8:08 p.m.

Tue. May 5  

🌅 5:53 a.m.

H: ≈63.7°F

L: ≈37.1°F

🌇 8:09 p.m.

Wed. May 6  

🌅 5:52 a.m.

H: ≈64.1°F

L: ≈37.5°F

🌇 8:11 p.m.

Thu. May 7  

🌅 5:51 a.m.

H: ≈64.5°F

L: ≈37.8°F

🌇 8:12 p.m.

Fri. May 8  

🌅 5:49 a.m.

H: ≈64.8°F

L: ≈38.2°F

🌇 8:13 p.m.

Sat. May 9 🌗

🌅 5:48 a.m.

H: ≈65.2°F

L: ≈38.5°F

🌇 8:14 p.m.

Sun. May 10  

🌅 5:47 a.m.

H: ≈65.5°F

L: ≈38.9°F

🌇 8:15 p.m.

Mon. May 11  

🌅 5:46 a.m.

H: ≈65.9°F

L: ≈39.3°F

🌇 8:16 p.m.

Tue. May 12  

🌅 5:45 a.m.

H: ≈66.2°F

L: ≈39.6°F

🌇 8:17 p.m.

Wed. May 13  

🌅 5:44 a.m.

H: ≈66.6°F

L: ≈40.0°F

🌇 8:18 p.m.

Thu. May 14 Ascension  

🌅 5:43 a.m.

H: ≈66.9°F

L: ≈40.3°F

🌇 8:19 p.m.

Fri. May 15  

🌅 5:42 a.m.

H: ≈67.3°F

L: ≈40.7°F

🌇 8:20 p.m.

Sat. May 16 🌑

🌅 5:41 a.m.

H: ≈67.6°F

L: ≈41.0°F

🌇 8:21 p.m.

Sun. May 17  

🌅 5:40 a.m.

H: ≈68.0°F

L: ≈41.4°F

🌇 8:22 p.m.

Mon. May 18  

🌅 5:39 a.m.

H: ≈68.3°F

L: ≈41.8°F

🌇 8:23 p.m.

Tue. May 19  

🌅 5:38 a.m.

H: ≈68.7°F

L: ≈42.1°F

🌇 8:24 p.m.

Wed. May 20  

🌅 5:37 a.m.

H: ≈69.0°F

L: ≈42.5°F

🌇 8:25 p.m.

Thu. May 21  

🌅 5:36 a.m.

H: ≈69.4°F

L: ≈42.8°F

🌇 8:26 p.m.

Fri. May 22  

🌅 5:35 a.m.

H: ≈69.7°F

L: ≈43.1°F

🌇 8:27 p.m.

Sat. May 23 🌓

🌅 5:34 a.m.

H: ≈70.0°F

L: ≈43.5°F

🌇 8:28 p.m.

Sun. May 24 Pentecost  

🌅 5:34 a.m.

H: ≈70.4°F

L: ≈43.8°F

🌇 8:29 p.m.

Mon. May 25 Memorial Day  

🌅 5:33 a.m.

H: ≈70.7°F

L: ≈44.2°F

🌇 8:30 p.m.

Tue. May 26  

🌅 5:32 a.m.

H: ≈71.1°F

L: ≈44.5°F

🌇 8:31 p.m.

Wed. May 27  

🌅 5:31 a.m.

H: ≈71.4°F

L: ≈44.8°F

🌇 8:32 p.m.

Thu. May 28  

🌅 5:31 a.m.

H: ≈71.8°F

L: ≈45.1°F

🌇 8:33 p.m.

Fri. May 29  

🌅 5:30 a.m.

H: ≈72.1°F

L: ≈45.4°F

🌇 8:34 p.m.

Sat. May 30  

🌅 5:30 a.m.

H: ≈72.5°F

L: ≈45.8°F

🌇 8:35 p.m.

Sun. May 31 🌕

🌅 5:29 a.m.

H: ≈72.8°F

L: ≈46.1°F

🌇 8:35 p.m.


Temperature climatic data from weather station: CASPER WWTP (USC00481569)

Precipitation climatic data from weather station: CASPER 1SW (USC00481572)

Agricultural climatic data from weather station: BATES CREEK #2 (USC00480552)