Miramichi (Bay du Vin)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Miramichi (Bay du Vin) clear sky chart from 2005-11-06 to 2025-02-21.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	17% 9% 3 7% 5% 4 5% 4 5% 7% 33%	108361
	Night	18% 10% 3 7% 4 4 4 3 5% 6% 34%	110338
Transparency	Day	50% 6% 12% 20% 11% 1	111910
	Night	50% 5% 12% 21% 10% 1	114953
Seeing	Day	24% 14% 33% 20% 7% 1	16896
	Night	25% 13% 33% 22% 7% 1	24701

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 17% 5% 10% 5% 4 4 4 5% 5% 24%	3157
	11th to 20th	Day	11% 13% 7% 12% 5% 6% 5% 3 4 6% 29%	3196
	21st to end	Day	6% 8% 4 7% 5% 4 6% 5% 6% 8% 42%	4355
February	1st to 10th	Day	12% 12% 4 9% 5% 4 4 4 7% 4 35%	1800
	11th to 20th	Day	15% 12% 4 9% 6% 5% 5% 4 5% 6% 30%	1753
	21st to end	Day	11% 12% 4 7% 7% 6% 6% 3 5% 6% 33%	1437
March	1st to 10th	Day	19% 13% 4 7% 4 4 5% 3 4 8% 28%	3359
	11th to 20th	Day	17% 17% 5% 11% 5% 5% 5% 4 4 5% 23%	3480
	21st to end	Day	27% 12% 3 7% 4 4 4 3 4 5% 26%	3816
April	1st to 10th	Day	20% 11% 4 7% 6% 5% 4 3 4 6% 29%	2239
	11th to 20th	Day	21% 9% 2 6% 5% 3 4 3 5% 6% 36%	2437
	21st to end	Day	25% 10% 3 6% 5% 3 4 3 4 5% 31%	2470
May	1st to 10th	Day	22% 13% 3 6% 5% 5% 5% 4 5% 6% 25%	4229
	11th to 20th	Day	18% 8% 3 7% 5% 4 4 3 5% 7% 36%	4398
	21st to end	Day	19% 7% 3 8% 6% 5% 5% 4 7% 8% 29%	4958
June	1st to 10th	Day	27% 8% 3 6% 4 4 4 4 5% 7% 28%	2850
	11th to 20th	Day	20% 7% 2 7% 5% 4 5% 3 6% 8% 34%	2850
	21st to end	Day	27% 8% 3 6% 6% 5% 4 3 5% 6% 26%	2850
July	1st to 10th	Day	14% 7% 3 9% 6% 5% 5% 4 6% 8% 33%	4760
	11th to 20th	Day	14% 6% 3 7% 5% 5% 6% 4 7% 8% 36%	4760
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 5% 7% 8% 38%	4803
August	1st to 10th	Day	15% 7% 3 7% 5% 5% 6% 4 6% 8% 32%	4105
	11th to 20th	Day	13% 6% 2 7% 5% 5% 6% 5% 6% 8% 37%	4045
	21st to end	Day	16% 5% 2 4 3 4 4 4 5% 8% 46%	4482
September	1st to 10th	Day	16% 5% 2 7% 4 4 5% 3 5% 7% 42%	2280
	11th to 20th	Day	17% 7% 2 6% 4 5% 3 3 3 5% 46%	2149
	21st to end	Day	19% 6% 2 5% 4 4 4 4 4 6% 41%	2068
October	1st to 10th	Day	15% 7% 2 7% 4 4 4 4 4 7% 42%	1900
	11th to 20th	Day	20% 8% 3 7% 4 4 4 3 5% 5% 37%	1900
	21st to end	Day	24% 6% 2 7% 5% 4 5% 3 5% 6% 34%	2007
November	1st to 10th	Day	20% 9% 2 7% 6% 4 4 4 5% 7% 33%	1582
	11th to 20th	Day	22% 11% 3 6% 4 4 4 3 5% 6% 32%	1600
	21st to end	Day	20% 13% 3 8% 5% 3 4 4 5% 5% 31%	1600
December	1st to 10th	Day	17% 12% 4 8% 4 4 4 4 5% 6% 34%	2592
	11th to 20th	Day	18% 12% 5% 7% 5% 3 3 3 4 6% 35%	2618
	21st to end	Day	16% 12% 6% 9% 5% 4 4 3 3 4 35%	3476
January	1st to 10th	Night	14% 16% 4 10% 5% 4 4 3 5% 6% 28%	6808
	11th to 20th	Night	14% 14% 5% 10% 5% 4 4 3 5% 6% 29%	6702
	21st to end	Night	7% 10% 3 7% 5% 4 4 3 5% 7% 45%	6586
February	1st to 10th	Night	14% 13% 3 7% 5% 5% 4 4 6% 6% 33%	2600
	11th to 20th	Night	16% 15% 4 8% 5% 5% 5% 3 5% 5% 30%	2533
	21st to end	Night	14% 13% 4 7% 6% 4 4 4 5% 6% 33%	2014
March	1st to 10th	Night	19% 14% 5% 10% 5% 5% 5% 3 4 4 26%	3480
	11th to 20th	Night	26% 16% 4 8% 5% 4 4 3 4 4 21%	3479
	21st to end	Night	30% 10% 3 7% 5% 3 4 3 4 5% 26%	3816
April	1st to 10th	Night	26% 11% 3 6% 5% 4 3 4 4 5% 29%	1940
	11th to 20th	Night	22% 11% 3 5% 3 3 3 3 6% 6% 33%	1691
	21st to end	Night	22% 11% 3 8% 3 4 4 3 4 5% 32%	1710
May	1st to 10th	Night	25% 12% 3 7% 5% 4 4 4 5% 6% 27%	2715
	11th to 20th	Night	19% 7% 3 8% 4 3 4 4 6% 7% 36%	2506
	21st to end	Night	15% 9% 3 8% 6% 6% 5% 4 5% 9% 29%	2656
June	1st to 10th	Night	27% 8% 3 7% 4 4 3 3 5% 5% 30%	1330
	11th to 20th	Night	19% 7% 2 5% 5% 4 5% 4 5% 6% 36%	1330
	21st to end	Night	27% 10% 2 6% 5% 5% 4 3 5% 5% 27%	1330
July	1st to 10th	Night	13% 7% 3 7% 4 5% 6% 4 6% 7% 38%	2210
	11th to 20th	Night	16% 7% 3 7% 5% 5% 5% 4 6% 7% 35%	2210
	21st to end	Night	11% 6% 2 6% 4 5% 5% 4 7% 9% 42%	2720
August	1st to 10th	Night	18% 7% 3 8% 5% 6% 6% 4 6% 7% 30%	2825
	11th to 20th	Night	12% 8% 3 8% 5% 5% 5% 4 6% 8% 37%	2782
	21st to end	Night	14% 4 2 6% 3 4 4 3 5% 8% 46%	3173
September	1st to 10th	Night	17% 6% 2 5% 3 4 3 3 4 8% 44%	1900
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 5% 7% 47%	2028
	21st to end	Night	18% 5% 2 5% 4 4 5% 3 5% 6% 43%	2111
October	1st to 10th	Night	19% 6% 2 5% 3 4 5% 4 4 6% 41%	2280
	11th to 20th	Night	17% 10% 2 6% 4 4 4 3 4 5% 41%	2280
	21st to end	Night	22% 8% 2 6% 5% 4 3 3 5% 6% 36%	2589
November	1st to 10th	Night	20% 9% 3 6% 4 4 4 3 5% 6% 36%	2714
	11th to 20th	Night	22% 11% 3 7% 5% 4 4 3 5% 6% 31%	2800
	21st to end	Night	23% 11% 3 7% 4 4 4 3 5% 6% 30%	2800
December	1st to 10th	Night	15% 11% 4 6% 4 4 4 3 5% 6% 38%	4597
	11th to 20th	Night	19% 11% 3 5% 4 3 3 3 5% 6% 38%	5591
	21st to end	Night	19% 12% 5% 8% 4 4 3 3 4 5% 31%	7502

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	61% 5% 11% 13% 9%	3158
	11th to 20th	Day	57% 6% 12% 14% 12% 1	3222
	21st to end	Day	39% 6% 12% 22% 20% 1	4355
February	1st to 10th	Day	51% 4 11% 19% 14% 2	1800
	11th to 20th	Day	54% 6% 9% 20% 11% 1	1761
	21st to end	Day	51% 5% 8% 21% 12% 2	1437
March	1st to 10th	Day	57% 5% 11% 18% 7% 2	3363
	11th to 20th	Day	64% 6% 8% 14% 6% 2	3480
	21st to end	Day	61% 4 6% 17% 10% 2	3816
April	1st to 10th	Day	56% 4 7% 17% 12% 3	2239
	11th to 20th	Day	50% 5% 10% 22% 12% 1	2437
	21st to end	Day	55% 6% 8% 15% 13% 4	2470
May	1st to 10th	Day	59% 5% 8% 19% 8% 1	4243
	11th to 20th	Day	47% 7% 14% 24% 7% 1	4402
	21st to end	Day	49% 9% 12% 19% 11%	4958
June	1st to 10th	Day	56% 6% 11% 18% 9% 1	2850
	11th to 20th	Day	48% 6% 13% 21% 11% 1	2850
	21st to end	Day	58% 7% 10% 17% 8%	2850
July	1st to 10th	Day	48% 7% 17% 18% 10%	4685
	11th to 20th	Day	45% 7% 15% 25% 8%	4679
	21st to end	Day	41% 8% 18% 24% 9%	4649
August	1st to 10th	Day	48% 7% 15% 21% 9%	4092
	11th to 20th	Day	43% 8% 15% 25% 9%	4084
	21st to end	Day	36% 5% 15% 26% 17%	4482
September	1st to 10th	Day	40% 7% 14% 24% 14%	2280
	11th to 20th	Day	42% 5% 12% 25% 15% 1	2149
	21st to end	Day	44% 6% 10% 26% 14% 1	2068
October	1st to 10th	Day	43% 6% 14% 26% 10% 1	3160
	11th to 20th	Day	48% 6% 11% 26% 10%	3140
	21st to end	Day	41% 5% 18% 21% 15% 1	3283
November	1st to 10th	Day	52% 5% 11% 21% 10% 1	1582
	11th to 20th	Day	53% 5% 13% 16% 12% 1	1600
	21st to end	Day	56% 7% 14% 16% 8%	1600
December	1st to 10th	Day	51% 5% 14% 21% 8%	2592
	11th to 20th	Day	53% 4 11% 18% 12% 2	2618
	21st to end	Day	55% 5% 10% 18% 10% 2	3476
January	1st to 10th	Night	56% 5% 13% 19% 6%	6808
	11th to 20th	Night	55% 6% 12% 16% 9% 1	6751
	21st to end	Night	40% 4 11% 25% 18% 3	6586
February	1st to 10th	Night	50% 5% 12% 17% 14% 3	2600
	11th to 20th	Night	56% 5% 9% 17% 12% 2	2536
	21st to end	Night	51% 6% 7% 20% 14% 3	2014
March	1st to 10th	Night	62% 5% 7% 16% 9% 2	3489
	11th to 20th	Night	65% 6% 8% 12% 8% 1	3480
	21st to end	Night	62% 3 5% 18% 10% 2	3816
April	1st to 10th	Night	57% 4 8% 16% 13% 3	1940
	11th to 20th	Night	50% 5% 9% 21% 13% 2	1691
	21st to end	Night	55% 5% 8% 14% 15% 3	1710
May	1st to 10th	Night	57% 6% 11% 16% 9% 1	2721
	11th to 20th	Night	43% 9% 14% 26% 7% 1	2507
	21st to end	Night	49% 9% 15% 18% 8%	2657
June	1st to 10th	Night	56% 6% 10% 19% 9% 1	1330
	11th to 20th	Night	47% 6% 12% 24% 8% 2	1330
	21st to end	Night	58% 5% 11% 17% 7% 1	1330
July	1st to 10th	Night	44% 7% 19% 18% 11% 1	2175
	11th to 20th	Night	46% 7% 15% 26% 6%	2168
	21st to end	Night	37% 9% 20% 23% 10%	2634
August	1st to 10th	Night	51% 9% 13% 20% 7%	2813
	11th to 20th	Night	42% 8% 19% 24% 7%	2809
	21st to end	Night	36% 6% 17% 25% 14% 1	3172
September	1st to 10th	Night	39% 6% 13% 30% 12% 1	1900
	11th to 20th	Night	37% 5% 14% 29% 14% 1	2028
	21st to end	Night	39% 6% 12% 28% 14% 1	2111
October	1st to 10th	Night	47% 5% 13% 27% 8%	3800
	11th to 20th	Night	41% 6% 12% 31% 10%	3779
	21st to end	Night	42% 4 17% 24% 13%	4263
November	1st to 10th	Night	50% 4 13% 22% 10% 1	2714
	11th to 20th	Night	55% 5% 12% 18% 10% 1	2800
	21st to end	Night	55% 7% 13% 18% 7%	2800
December	1st to 10th	Night	45% 4 13% 27% 10%	4597
	11th to 20th	Night	48% 4 10% 23% 13% 1	5592
	21st to end	Night	57% 4 12% 19% 9% 1	7502

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	32% 15% 38% 14% 2	200
	11th to 20th	Day	30% 20% 24% 17% 9% 2	200
	21st to end	Day	16% 19% 39% 21% 5%	394
February	1st to 10th	Day	25% 18% 35% 17% 5% 2	400
	11th to 20th	Day	23% 24% 35% 13% 4 1	396
	21st to end	Day	22% 16% 39% 18% 5% 1	319
March	1st to 10th	Day	28% 17% 36% 15% 3 1	460
	11th to 20th	Day	27% 18% 28% 20% 6% 2	460
	21st to end	Day	31% 17% 34% 13% 5% 1	506
April	1st to 10th	Day	29% 21% 34% 12% 3 1	460
	11th to 20th	Day	27% 20% 31% 17% 4 1	452
	21st to end	Day	32% 14% 29% 18% 4 2	460
May	1st to 10th	Day	30% 16% 28% 19% 5% 1	534
	11th to 20th	Day	24% 13% 30% 20% 10% 2	674
	21st to end	Day	26% 15% 34% 19% 5% 1	735
June	1st to 10th	Day	33% 11% 31% 15% 9% 1	680
	11th to 20th	Day	24% 13% 31% 25% 8% 1	680
	21st to end	Day	28% 10% 29% 25% 7% 1	680
July	1st to 10th	Day	20% 9% 38% 20% 12% 1	670
	11th to 20th	Day	15% 7% 39% 27% 11% 1	668
	21st to end	Day	16% 6% 35% 30% 10% 2	688
August	1st to 10th	Day	15% 7% 35% 30% 10% 2	486
	11th to 20th	Day	16% 9% 28% 32% 14% 1	479
	21st to end	Day	16% 11% 29% 30% 12% 3	539
September	1st to 10th	Day	16% 12% 36% 24% 11% 1	490
	11th to 20th	Day	22% 12% 31% 23% 8% 3	490
	21st to end	Day	20% 16% 33% 20% 9% 3	477
October	1st to 10th	Day	19% 12% 32% 22% 13% 2	390
	11th to 20th	Day	25% 16% 29% 19% 8% 1	390
	21st to end	Day	27% 20% 32% 16% 5% 1	429
November	1st to 10th	Day	24% 21% 34% 15% 5% 1	395
	11th to 20th	Day	30% 18% 30% 15% 6% 1	400
	21st to end	Day	34% 19% 30% 14% 2 1	400
December	1st to 10th	Day	32% 14% 32% 16% 4 1	395
	11th to 20th	Day	29% 24% 34% 11% 3	200
	21st to end	Day	26% 22% 32% 15% 5%	220
January	1st to 10th	Night	25% 17% 34% 19% 4	900
	11th to 20th	Night	24% 16% 33% 20% 6%	885
	21st to end	Night	18% 18% 37% 21% 5%	880
February	1st to 10th	Night	22% 16% 37% 19% 6% 1	800
	11th to 20th	Night	27% 19% 36% 14% 4 1	783
	21st to end	Night	21% 14% 38% 21% 6%	629
March	1st to 10th	Night	26% 13% 36% 22% 3	760
	11th to 20th	Night	25% 16% 32% 19% 6% 1	760
	21st to end	Night	26% 14% 34% 21% 5% 1	836
April	1st to 10th	Night	33% 14% 27% 23% 3	610
	11th to 20th	Night	30% 11% 34% 17% 9% 1	564
	21st to end	Night	31% 11% 28% 22% 8% 1	570
May	1st to 10th	Night	32% 10% 27% 24% 8%	570
	11th to 20th	Night	26% 7% 31% 26% 10% 1	562
	21st to end	Night	22% 12% 35% 25% 6%	562
June	1st to 10th	Night	32% 5% 27% 28% 7%	380
	11th to 20th	Night	23% 5% 28% 33% 11%	380
	21st to end	Night	31% 6% 27% 26% 10% 1	380
July	1st to 10th	Night	18% 7% 40% 24% 10% 1	370
	11th to 20th	Night	17% 4 32% 37% 10%	368
	21st to end	Night	18% 5% 29% 34% 13% 1	551
August	1st to 10th	Night	21% 2 33% 32% 12%	568
	11th to 20th	Night	17% 6% 27% 39% 12% 1	562
	21st to end	Night	16% 7% 30% 31% 14% 2	627
September	1st to 10th	Night	20% 8% 38% 27% 8% 1	570
	11th to 20th	Night	19% 10% 32% 30% 10% 1	698
	21st to end	Night	20% 9% 36% 25% 10% 1	760
October	1st to 10th	Night	23% 10% 32% 25% 9% 1	760
	11th to 20th	Night	23% 11% 37% 21% 8% 1	760
	21st to end	Night	26% 18% 33% 18% 5%	836
November	1st to 10th	Night	27% 17% 33% 17% 5% 1	870
	11th to 20th	Night	28% 19% 30% 16% 5% 1	900
	21st to end	Night	30% 20% 28% 17% 4	900
December	1st to 10th	Night	30% 17% 35% 15% 4	900
	11th to 20th	Night	29% 22% 32% 14% 3	900
	21st to end	Night	29% 19% 29% 18% 4 1	990

Page generated at 2025-02-18 04:26:32. Version ac07

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