Combined with Snow Means Death in Berserk, twice. Once when Caska tries to dissuade Guts from leaving his pre-Eclipse True Companions, right before the showdown with Griffith (this also marked the moment when she had her Love Epiphany). The other one post-Eclipse when Guts fights off snow-demons to protect Caska. They also share a Crowning Moment of Heartwarming in the snow when Guts and Casca depart from Godo's place when Guts wraps his cape around her and says that he would never leave her behind again.
Love Hina's Christmas special, in which Naru and Keitaro spend a good deal of time wandering around feeling lonely. As well, it is snowing when Naru finds Keitaro after he ran off in an early episode of the series.
The heartwarming ending of the 1999 To Heart Anime series.
On Sara and Lottie's home planet in Soukou No Strain, snow means brother-sister love.
The ending credits of Trinity Blood show a snowy romance between Abel Nightroad and Esther Blanchett. That never happens in the actual show, though.
It starts snowing in Kurau Phantom Memory when Kurau returns to Christmas, in the same manner as Christmas appeared to the former Kurau years before.
In the first episode of Someday's Dreamers ~Summer Skies~, Michiru asks Sora to use her magic to conjure up a gentle snowfall over her as she confesses her love to her crush. This actually happens indoors.
In the OVA of Uta Kata, the loving but temporary reunion of Ichika and Sei with their reflections, Manatsu and Kai, takes place during a white Christmas.
There's a boatload of snow in the School Play romance the characters of D.N.Angel put on and the arc it was based in. Notable in that the romantic leads were played by Daisuke and Satoshi.
An example happens in Ayashi No Ceres. When Suzumi sends Tooya out to do a dangerous mission, Aya runs after him in worry. He reassures her that everything will be fine by giving her a lovebite and then kissing her, at which point it starts snowing. But since this is Aya-slash-Ceres we're talking about, it's a subversion: The snow turns out to be flower petals.
Midori Days parodies this when Seiji and Ayase are stuck in a snow storm looking for safety. Ayase thinks it's romantic at first, but after her body starts to freeze, she starts to focus.
Code Geass has an enigmatic conversation between C.C. and Lelouch over why snow is white. The beginning of the conversation takes place on a mountain top. While their relationship is not strictly romantic, this was a 'getting to know you' moment between them.
Subverted on Naruto: Sakura spending half of chapter 469 declaring to Naruto that she loves him and that she loves Sasuke no more, all in a snowfield with the snow falling softly, then on the final panel (and to Sakura's surprise) Naruto rejects her, the text on that panel even lampshades it: "In the falling snow..." Justified, since he could tell she was lying.
Lampshaded in Keroro Gunsou, where snow is explicitly stated to make girls three times more beautiful.
In the Aoi Bungaku segment adapting Osamu Dazai's Ningen Shikkaku (No Longer Human), the protagonist Yozo Ooba meets his future wife when she shelters him as he lies collapsed on a snowy street.
Ranma ½: After Akane has a long day of trying to find Ranma for Christmas Eve, she eventually gives up and starts to go back to her house. As it turns out, Ranma had actually been waiting for her at some spot on the way there because it would, as he puts it, "be embarrasin' at home." He then proceeds to give her presents that she had earlier told him she wanted, which, of course, makes her smile and it immediately starts snowing for some reason...
Ranma:*laughs* Snow's kinda perfect right now!
In the anime adaptation of Aoi Hana, Fumi and Akira share a very important moment in the snow when Fumi finally realizes that Akira was her first love.
In Rurouni Kenshin, during the Jinchuu/Memorial arc, Kenshin and Tomoe share an intimate scene with each other in their cabin as it is snowing. However, much like the case in Berserk, it was later mixed with death.
Junjou Romantica: It's snowing in the scene where Usagi rather abruptly realizes that, oh, he doesn't love Takahiro, but Misaki instead. And then he promptly makes out with him against a streetlight.
Kara no Kyoukai has Shiki Ryougi and Mikiya Kokutou meet for the first time while it was snowing.
It also snows in the epilogue OVA, one of the most romantic sections of the whole series.
In Wild Fangs, as Mao waits at the train station it begins snowing and Syon shows up to stop him from leaving. While they have their romantic moment it's announced that the trains are cancelled because of the snowfall.
Snow is often associated with Jack and Lacie in Pandora Hearts. They met on a snowy day, reunited eight years later on a snowy day, and Jack found out Lacie died on a snowy day.
In School Days, Makoto aplogizes to Kotonoha and says he loves her in a snowfall at episode 11, a redeeming moment in the anime. Comes complete with Kotonoha covered in snow.
Scott Pilgrim: Scott and Ramona are caught out in a sudden snowstorm (it is Toronto, after all) in the middle of deciding to date each other. This also has the convenient side effect of forcing Scott to crash at Ramona's place...
A rather tragic example from Batman: flashbacks in one comic show a pre-transformation Dr. Victor Fries, starved for love his whole life, finally find happiness with his future wife Nora, and the two share a tender first kiss as snow falls around them. What makes it tragic is the fact that we already know that eventually Nora contracts the rare disease that results in her being placed in suspended animation while Victor feverishly works to save her...before he himself is turned into Mr. Freeze. The fact that they share their first kiss while snow falls around them is romantic...but still bitter irony considering the mutation that Victor ends up undergoing later on.
In White Rain, snow was falling when Itachi (senior) made his proposal to Lucia (to spend their last time together pretending that they were ordinary people who loved each other). It is only much later that Lucia realizes that even then, she may have actually loved Itachi all along.
Were Gonna Get There Soon: Derpy thanks Thunderlane for helping avert a potential disaster when she had to provide snacks for the next Weather Team meeting. She gives him a piece of Maple Candy she saved, shaped like a heart, and Thunderlane gets it enough to kiss her cheek as she looks away bashfully.
The timescale of the movie was adjusted from the original musical (the aforementioned scene taking place three months before New Years instead of six), possibly so that this trope could be included.
Groundhog Day features several such scenes with Bill Murray and Andie MacDowell.
In the movie Patlabor 2, Captain Shinobu Nagumo and Yukihito Tsuge have a secret meeting during a gentle snow fall, with a romantic soundtrack (titled "With Love").
In the film version of RENT, snow falls as Mimi and Roger stand outside the cafe after Maureen's protest and finally admit they could have a real relationship together.
Possibly suggested by a line from the number Christmas Bells (not included in the film) in which Angel instructs Collins "Kiss me; it's beginning to snow."
Variation: in the nameless Quirky Town of Edward Scissorhands, it never snows. But on the night of a Christmas party, Kim finds Edward carving an ice angel and the little bits of ice that fly about as he works create a snowfall of sorts. She's enamored by the sight and, in essence, this is the moment she realizes she loves him as she twirls about. The lovers are forced to part and never see each other again in the Bittersweet Ending, but Edward continues to carve these sculptures up in his castle, and in the process brings snow to the entire neighborhood. Only Kim knows the significance of it, and why he does it. In effect this is a literal take on the trope.
Oldboy: Subverted to disturbing effect at the ending. Why's it so disturbing? The ending is best left unmentioned anyway.
Subverted in the Japanese film Always: Sunset on Third Street. Chagawa proposes to his love interest Hiromi on Christmas Eve, but he can only afford to get a ring case, so he gives an invisible ring to her (she accepts, playing along with the gesture). The following morning, he discovers that Hiromi's bar is closed and that she has sold herself off to work in a dance hall because of her debts. They eventually get back together in the sequel.
The Fantasticks features snow in the final scene when Luisa and Matt get back together.
Coincidentally happens in Serendipity at the skating rink.
At the end of House of the Flying Daggers he holds the girl in the snow as she bleeds out.
In Far and Away, Joseph and Shannon have an odd but touching scene where they confess their love. Meanwhile, it snows outside the home they're taking shelter in.
Shannon: Pretend you love me.
Joseph: I pretend I love you.
Shannon: I pretend I love you, too.
Invoked in the end of Snow Dogs When Ted and Barb kiss for the first time (and Demon and Nana reveal their feelings for each other).
Let It Snow: This is the entire premise of the collection of short stories. All three short stories take place in the same town, between December 24 and 26, when a massive snow storm hits.
Live Action TV
One of South Korea's most successful exports to Japan was the romantic TV miniseries Winter Sonata, which featured snow as a repeated visual theme for exactly the reasons listed above.
Another Korean Series, Padam Padam, has the lead character skinny-dipping in a snowstorm with his ladylove, just to see what it feels like.
In an episode of CSI: New York, a couple arrive in a "winter wonderland" and start kissing. Then an ice castle collapses and they find a corpse.
Due South: Near the end of the first season, Fraser and Victoria's relationship is repeatedly symbolized by metaphorical falling snow. Somewhat subversive in that this relationship isn't especially healthy - the snow could as much symbolize Victoria's lies & deception as love.
In season 3 of Buffy the Vampire Slayer, a providential snowfall prevents Angel from committing suicide-by-sun. He and Buffy then go for a walk in the snow.
In an episode of The Outer Limits (1995-2002), a scientist believing the sun has gone nova and burned off half the Earth's atmosphere tries to distract his longtime love interest by walking downtown. The erratic weather causes a romantic snowfall.
The X-Files: In a season six Christmas episode, Mulder and Scully start unwrapping their presents to one another, just as the snow starts falling. They live in the Washington-Metropolitan area, where snow doesn't usually fall until mid-January, so it's especially meaningful.
In Downton Abbey, it is snowing when Matthew proposes to Lady Mary at the end of the Christmas special.
The second Barney and Robin kiss after becoming engaged in How I Met Your Mother, it begins to snow. It also continues to snow while they bask in the moment and when Marshall and Lily are reunited with baby Marvin.
In RENT, one of Angel's lines it "Kiss me, it's beginning to snow!" (Cue happy fangirl sighs)
Note Mark's observations, the penultimate lines of ACT I in the stage play: "The riot continues. The Christmas tree goes up in flames. The snow dances. Oblivious, Mimi and Roger share a small, lovely kiss." This occurs after their love song, I Should Tell You.
Used in the Flashback sections of the video for Kate Bush's "This Woman's Work".
The holiday song Footprints is basically all about this trope.
As is the Winter Wonderland song.
A few traditional Christmas songs invoke this trope: "Let It Snow" and "Walkin' in a Winter Wonderland," for example.
The lyrics of Nightwish's song "Come Cover Me" are full of this trope.
"The Snowfoot Waltz" by The Divers, a band made of professors from my college, is a lovely example. The chorus:
Dance with me through the falling snow. The temperature's fine for three-quarter time, And there's no better ballroom I know. Dance with me through the empty streets. The traffic is dead and there's a tune in my head, And without you it won't be complete, To do the Snowfoot Waltz.
Fate is strange, isn't it? That time that has stopped and rusted Brings morning to even this world As we start to walk, the warm snow falls on us As if we were blessed lalalulala lalalulala lalalulala It was as if you had put on a white veil
In Resident Evil 6, when Jake and Sherry take shelter from a massive snow storm in a cozy little cabin, there's have an intimate moment, that ends with Jake on top of her. Granted, this is because his superhuman abilities allowed him to hear the enemies coming and he was just pushing her out of the way to protect her. Still, it was quite romantic.
Tales of Phantasia puts the game's only romantic scene between Cless and Mint (and one between Arche and Chester) in a town that's perpetually bathed in snowfall. The scene also has a poignant C-arc where Klarth uses his single Origin-powered time-scrying to check in on his love Mirald.
Similarly, Tales Of Symphonia has the scene between Lloyd and his future 'soulmate' (mind you, only two of them are romantic in nature) placed in a similar location. The same town, actually (Actually, Flanoir is Freizkeil, Meltokio is Arlee); 4000 years and a continental shift earlier.
Lampshaded and subverted in Tales Of The Abyss. All of the girls (and Ion) discuss how romantic the snowy city of Keterburg is and how lovely it would be to walk with a gentleman through the snow. Unfortunately, Jade is, off visiting his sister, Guy is terrified of being close to women and the fact that all of the women in town like to keep close is driving him crazy, and Luke's outfit has a bare stomach which is now freezing. Needless to say, the women are disappointed, except Tear who thought it was cute that Luke was worried about his belly freezing.
In Fire Emblem: Geneaology of the Holy War, chapter 4 takes place in snowy Silesia and gives us three possible relationship-boosting talks between Azel and Tiltyu, Levin and Fury, and Claude and Sylvia.
Kanon is entirely based around sad girls in the snow. Small wonder that Yuuichi hates the stuff.
In Tomoyo's route in the CLANNAD visual novel, Tomoya breaks up with her so that she can focus on her responsibilities and become successful. After eight months, he walks out of the school one day and sees her standing in the snow in front of him. She tells him that her responsibilities are concluded, that she loves him, and that she has been waiting for him for those whole eight months. They hug.
Done exactly the same way in the bonus episode of CLANNAD called "Another World: Tomoyo".
In Fate/stay night, Ilya makes it snow when parting with Shirou at one point. It's actually a mix of the two types listed in that Ilya is his adopted sister, so not quite romantic love, plus she's a little strange sometimes and sad girl in the snow, because it's one of the big clues to Shirou that her cheerful act is mostly a facade against being hurt anymore. Apparently, every Holy Grail War in Fuyuki has taken place in winter. You know some people love that grail.
Subverted in Katawa Shoujo. The game opens with a Love Confession to the main character, Hisao, by his crush in the falling snow. Unfortunately, the stress of the situation triggers Hisao's cardiac arrythmia - which he didn't even know he had before then - and things veer dangerously close to Snow Means Death as he has a heart attack. He spends the next six months in the hospital... and the relationship doesn't last more than six weeks.
The game starts in June, and most of the routes end by August, so the routes largely avert this. Shizune's route, however, lasts until Hisao graduates, but there are no scenes in the snow.
Chizuru watches the snow fall with Saito in his good ending in Hakuouki.
Megatokyo: The phrase "sad girl in snow" in webcomics was popularized by the strip, deriving simply from the fact that this is something the creator/character Piro draws a lot of. Specifically this guest comic by Mac Hall, lampooning Piro's angst, self-depreciation and fascination with Moe Moe, even early in the strip. There hasn't been snow until near the end of Chapter 9. Of course, shortly after it starts, Miho gets nuked.
The last pages of Nineteen, Twenty-One are set in the snow and it's where Yun-lee and Dong-whi finally get together and have their first kiss.
Homestuck: It's snowing when Vriska finally gets to go on her date with John. Unfortunately, this is because she has died and they've met up in a dream bubble. And this actually isn't her John, but a John who died in a doomed timeline before he met her. Their conversation is sad, but still sweet.
The Season one finale of American Dragon Jake Long used this trope with a twist. The opening scene shows Jake and Rose together in Central Park on a snowy day, with Jake wondering if she should reveal his Secret Identity to her in order to proceed with their relationship. (However, in a textbook case of Dramatic Irony, it turns out Rose is actually the Huntsgirl, and has unknowingly tried to kill Jake multiple times. In the climactic scene of the episode, where Huntsgirl removes her glove to reveal Rose's dragon-shaped birthmark, takes place during a blizzard. It's almost Snow Means Death, except instead of the death of a person, we see the death of a relationship. They get back together. Guess it was a Disney Death.