ɪn pˈɑːɹts ʌvðə nˈɔːɹðɚn hˈɛmɪsfˌɪɹ, ðə pˈiəɹɪəd fɹʌm mˈeɪ twˈɛlv tə mˈeɪ fˈɪftiːn ɪz ˈɔfən bᵻlˈiːvd tə bɹˈɪŋ ɐ bɹˈiːf spˈɛl ʌv kˈoʊldɚ wˈɛðɚɹ ɪn mˈɛni jˈɪɹz, ɪŋklˈuːdɪŋ ðə lˈæst nˈaɪtli fɹˈɔsts ʌvðə spɹˈɪŋ.
In parts of the Northern Hemisphere, the period from May 12 to May 15 is often believed to bring a brief spell of colder weather in many years, including the last nightly frosts of the spring.