seasonally + past participle
常用于经济统计，表示已消除季节性波动的影响。
The seasonally adjusted unemployment rate fell to 4%.
经季节性调整的失业率降至4%。
按季节；随季节变化地
每个季节都发生；仅在当季发生；在相应季节内发生；与当前季节相宜；季节性地；周期性地
varying by season; at particular times of the year
每个季节都发生
Occurring every season.
仅在当季发生
Occurring only in season.
在相应季节内发生；与当前季节相宜
Occurring within the relevant season; appropriately to the current season.
Many birds migrate seasonally to find warmer weather.
许多鸟类按季节迁徙以寻找更温暖的天气。
用法提示：此处 seasonally 作副词，表示“按季节地”，修饰动词 migrate。
The resort only opens seasonally, from June to September.
这家度假村只在六月到九月间季节性开放。
用法提示：seasonally 是副词，说明开放的时间随季节变化。
Farm workers are hired seasonally during the harvest.
农场工人在收获季节被季节性雇用。
用法提示：seasonally 作副词，修饰被动结构，表示“按季节地”。
常用于经济统计，表示已消除季节性波动的影响。
The seasonally adjusted unemployment rate fell to 4%.
经季节性调整的失业率降至4%。
Prices vary seasonally in many tourist towns.
许多旅游城镇的价格会随季节变化。
The beaches here are seasonally crowded.
这里的海滩在特定季节很拥挤。
与 seasonally 同义，但为介词短语，作状语时可互换；常用于说明随季节变化的情况。
grammar · medium
易错句子The restaurant closes seasonal in winter.
正确表达The restaurant closes seasonally in winter.
动词 close 需要用副词 seasonally 来修饰，表示“按季节地”；seasonal 是形容词，只能修饰名词，不能修饰动词，因此这里应改用副词。
grammar · medium
易错句子This is a seasonally job.
正确表达This is a seasonal job.
名词 job 需要用形容词 seasonal 来修饰，表示“季节性的”；seasonally 是副词，不能放在名词前作定语，因此应改用形容词。
针对 seasonally 的“按季节地；随季节变化地”义项。year-round 作副词时表示“全年、不随季节变化”，与 seasonally 相对；但 year-round 也可作形容词，如 a year-round resort，seasonally 则只能作副词。
seasonally 是副词，修饰动词或形容词，表示“按季节地、随季节变化地”；seasonal 是形容词，修饰名词，表示“季节性的”。要看被修饰的是名词还是动词/形容词。
seasonable 表示“适合当前季节或时机的、应时的”，而 seasonally 描述按季节发生或随季节变化。两者词形相近但含义不同，seasonable 不强调“周期性”。
seasonality 是名词，指“季节性”这一属性或现象；seasonally 是副词，修饰动作，表示“按季节地”。需要名词时不能把副词当作名词使用。
经季节性调整的
The unemployment figures are seasonally adjusted to account for holiday hiring.
失业数据经过季节性调整，以考虑节日招聘因素。
应季供应的
Fresh strawberries are seasonally available at local markets.
新鲜草莓在当地市场应季供应。
随季节变化的
Tourist numbers in the region are seasonally variable.
该地区的游客数量随季节变化。
取决于季节的
The farm's income is seasonally dependent on the harvest.
这个农场的收入取决于季节性的收成。
季节性受雇的
Many lifeguards are seasonally employed during the summer.
许多救生员在夏季被季节性雇用。
season (n. 季节) + -al (形容词后缀) + -ly (副词后缀)
词根
season (n. 季节) + -al (形容词后缀)
天气随季节变化，是讨论季节性现象时最常见的相关概念。
许多农事活动如收割会随季节规律发生。
鸟类或动物的迁徙常与特定季节相关。
花粉等过敏症状常在特定季节出现。
旅游客流量常有明显的季节性波动。
Dictionary facts from ECDICT, WIKTIONARY.