42 butterflies were recorded flying in Louisiana in December in our iNaturalist sample; 0 of the top 50 are at their peak this month. The list is ranked by number of research-grade observations.
Top butterflies in December

Monarch

Gulf Fritillary

Long-tailed Skipper

Cloudless Sulphur

Red Admiral

Common Buckeye
Sleepy Orange

Little Yellow

Fiery Skipper

Ocola Skipper

American Snout

Tropical Checkered-Skipper
All butterflies flying in Louisiana in December
| # | Species | Scientific name | Family | Obs. | Peak in state |
|---|---|---|---|---|---|
| 1 | Monarch | Danaus plexippus | Brush-footed Butterflies | 145 | Oct (past peak) |
| 2 | Gulf Fritillary | Dione vanillae | Brush-footed Butterflies | 137 | Oct (past peak) |
| 3 | Long-tailed Skipper | Urbanus proteus | Skippers | 66 | Oct (past peak) |
| 4 | Cloudless Sulphur | Phoebis sennae | Whites, Yellows, and Sulphurs | 63 | Sep (past peak) |
| 5 | Red Admiral | Vanessa atalanta | Brush-footed Butterflies | 46 | Mar (past peak) |
| 6 | Common Buckeye | Junonia coenia | Brush-footed Butterflies | 41 | Oct (past peak) |
| 7 | Sleepy Orange | Eurema nicippe | Whites, Yellows, and Sulphurs | 27 | Sep (past peak) |
| 8 | Little Yellow | Eurema lisa | Whites, Yellows, and Sulphurs | 26 | Oct (past peak) |
| 9 | Fiery Skipper | Hylephila phyleus | Skippers | 23 | Oct (past peak) |
| 10 | Ocola Skipper | Panoquina ocola | Skippers | 18 | Oct (past peak) |
| 11 | American Snout | Libytheana carinenta | Brush-footed Butterflies | 12 | Apr (past peak) |
| 12 | Tropical Checkered-Skipper | Burnsius oileus | Skippers | 11 | Sep (past peak) |
| 13 | Question Mark | Polygonia interrogationis | Brush-footed Butterflies | 10 | Apr (past peak) |
| 14 | Phaon Crescent | Phyciodes phaon | Brush-footed Butterflies | 7 | Oct (past peak) |
| 15 | American Lady | Vanessa virginiensis | Brush-footed Butterflies | 6 | Apr (past peak) |
| 16 | White Peacock | Anartia jatrophae | Brush-footed Butterflies | 6 | Oct (past peak) |
| 17 | Zebra Longwing | Heliconius charithonia | Brush-footed Butterflies | 6 | Oct (past peak) |
| 18 | Viceroy | Limenitis archippus | Brush-footed Butterflies | 6 | Sep (past peak) |
| 19 | Red-banded Hairstreak | Calycopis cecrops | Gossamer-winged Butterflies | 6 | Mar (past peak) |
| 20 | Queen | Danaus gilippus | Brush-footed Butterflies | 5 | Aug (past peak) |
| 21 | Spicebush Swallowtail | Papilio troilus | Swallowtails and Parnassians | 5 | Aug (past peak) |
| 22 | Eastern Giant Swallowtail | Heraclides cresphontes | Swallowtails and Parnassians | 5 | Sep (past peak) |
| 23 | Gray Hairstreak | Strymon melinus | Gossamer-winged Butterflies | 4 | Oct (past peak) |
| 24 | Pearl Crescent | Phyciodes tharos | Brush-footed Butterflies | 4 | May (past peak) |
| 25 | Eastern Gemmed-Satyr | Cyllopsis gemma | Brush-footed Butterflies | 4 | Mar (past peak) |
| 26 | White Checkered-Skipper | Burnsius albezens | Skippers | 4 | Apr (past peak) |
| 27 | Brazilian Skipper | Calpodes ethlius | Skippers | 3 | Aug (past peak) |
| 28 | Variegated Fritillary | Euptoieta claudia | Brush-footed Butterflies | 3 | Oct (past peak) |
| 29 | Clouded Skipper | Lerema accius | Skippers | 3 | Oct (past peak) |
| 30 | Southern Pearly-eye | Lethe portlandia | Brush-footed Butterflies | 3 | Mar (past peak) |
| 31 | Least Skipper | Ancyloxypha numitor | Skippers | 2 | Jul (past peak) |
| 32 | Eastern Tiger Swallowtail | Papilio glaucus | Swallowtails and Parnassians | 2 | Aug (past peak) |
| 33 | Dainty Sulphur | Nathalis iole | Whites, Yellows, and Sulphurs | 1 | Oct (past peak) |
| 34 | Small White | Pieris rapae | Whites, Yellows, and Sulphurs | 1 | May (past peak) |
| 35 | Black Swallowtail | Papilio polyxenes | Swallowtails and Parnassians | 1 | May (past peak) |
| 36 | Great Purple Hairstreak | Atlides halesus | Gossamer-winged Butterflies | 1 | Oct (past peak) |
| 37 | Funereal Duskywing | Erynnis funeralis | Skippers | 1 | Jun (past peak) |
| 38 | Eufala Skipper | Lerodea eufala | Skippers | 1 | Oct (past peak) |
| 39 | Carolina Satyr | Hermeuptychia sosybius | Brush-footed Butterflies | 1 | Mar (past peak) |
| 40 | Palamedes Swallowtail | Papilio palamedes | Swallowtails and Parnassians | 1 | Apr (past peak) |
| 41 | Goatweed Leafwing | Anaea andria | Brush-footed Butterflies | 1 | Mar (past peak) |
| 42 | Southern Skipperling | Oarisma minima | Skippers | 1 | Aug (past peak) |