Blair (23) threw 47.91m at the Athletics Otago weekly meeting at the Caledonian Ground. It was the second-best throw of her career.
She set the Otago senior women's record of 50.11m last season and this summer is targeting Kirsten Hellier's 1999 New Zealand resident and national senior women's record of 54.14m.
Blair's sequence of throws was 43.32m, 47.91m, 43.30m, 41.53m, foul, 43.53m.
She is one of the stars of coach Raylene Bates' stable of throwers.
"We changed Hannah's technique during the winter," Bates said.
"I want her to have a strong left sideways throw and to use her whole body when she releases the javelin.
"Once she masters this she will throw consistently over 50m."
Blair was a promising thrower when she was growing up on a farm at Warepa, in South Otago, but her career has blossomed since she came under the tutelage of Bates three years ago.
She was third in the women's javelin at the New Zealand championships in 2008, won the silver medal last year and the gold medal this year.
Blair finished fifth with 44.95m at an international meet in New Caledonia two weeks ago.
Two other members of Bates' throwing squad also performed impressively in the javelin on Saturday.
Jessica Hamill (Southland), a silver medallist in the AWD shot put at the Commonwealth Games in New Delhi, won the F 34 wheelchair throw with 13.04m.
The promising Libby Jones (Taieri) won the girls aged 14 and under javelin with 19.03m. She is from Wanaka and is the granddaughter of former All Black Tuppy Diack.
Kieran Fowler (Taieri), another member of the Bates team, won the senior men's shot put with 14.28m from club-mate Jerram Huston 13.66m. It was a personal best by 27cm.
Fowler, a former New Zealand junior decathlon champion, won silver in the discus at the New Zealand championships last season.
Bates is also chief coach of the New Zealand AWD team that is preparing for the world championships in Christchurch in January. The team was at a training camp at Dunedin at the weekend and competed at the Caledonian Ground.
One of the most impressive was Kate Horan (Wellington), who won the women's AWD 200m in 29.70sec. She was a silver medallist in the event at the Beijing Paralympics two years ago.
Matthew Lack (Opotiki), who has spina bifida, won the wheelchair 100m in 15.70sec, while Joe Flavell (Auckland), who lost his right leg two years ago, won the shot put with 9.77m.
The duel between Andrew Whyte (South Otago) and Glen Ballam (Southland) in the 400m was the highlight of the men's senior track events.
Whyte took off like a frightened rabbit and led by 5m after 200m, and still held the advantage around the final bend. But Ballam fought back and kept closing the gap down the straight.
Whyte (17), one of the most promising long sprinters in Otago, hung on to win in 51.18sec with Ballam clocking 51.66sec. It was a superb time by both runners in the difficult conditions.
Of the three events held for the Hurring Memorial relays, which will be staged over several weeks, the most significant was the men's 4x800m relay.
John Schreuder took Caversham into the lead in the third lap to give Daniel Balchin an easy run home. The team's time was 8min 24.58sec.
