Blomidon Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Blomidon Provincial Park clear sky chart from 2005-11-06 to 2024-11-04.

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	18% 11% 4 9% 5% 5% 5% 4 5% 6% 30%	102005
	Night	20% 12% 4 10% 6% 5% 4 3 5% 6% 26%	97052
Transparency	Day	53% 8% 12% 18% 9% 1	105597
	Night	56% 7% 11% 17% 8% 1	101549
Seeing	Day	23% 10% 27% 27% 11% 1	17167
	Night	24% 13% 30% 25% 8% 1	24554

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	16% 16% 7% 12% 6% 5% 5% 3 4 4 22%	2312
	11th to 20th	Day	15% 15% 6% 17% 8% 7% 6% 3 5% 5% 13%	2626
	21st to end	Day	15% 11% 5% 13% 9% 8% 6% 4 5% 6% 19%	3124
February	1st to 10th	Day	19% 14% 4 11% 10% 6% 6% 4 5% 4 16%	1710
	11th to 20th	Day	16% 14% 5% 12% 9% 6% 5% 4 5% 4 20%	1663
	21st to end	Day	11% 11% 5% 10% 8% 6% 5% 4 4 7% 29%	1423
March	1st to 10th	Day	22% 13% 4 9% 7% 7% 4 3 4 5% 22%	3430
	11th to 20th	Day	13% 15% 6% 10% 6% 5% 5% 3 4 6% 26%	3480
	21st to end	Day	28% 13% 4 10% 5% 4 5% 2 3 4 21%	3816
April	1st to 10th	Day	21% 12% 4 8% 5% 5% 4 3 5% 7% 27%	2260
	11th to 20th	Day	18% 10% 3 8% 4 4 4 4 6% 7% 33%	2352
	21st to end	Day	19% 10% 2 7% 5% 4 5% 3 5% 6% 31%	2470
May	1st to 10th	Day	21% 12% 5% 9% 5% 4 4 3 5% 6% 24%	4196
	11th to 20th	Day	16% 9% 3 8% 5% 4 5% 4 5% 7% 35%	4398
	21st to end	Day	16% 9% 3 7% 6% 5% 5% 4 7% 9% 31%	4836
June	1st to 10th	Day	21% 10% 3 8% 5% 5% 5% 4 5% 6% 27%	2679
	11th to 20th	Day	21% 7% 3 7% 4 4 4 3 6% 7% 33%	2850
	21st to end	Day	24% 10% 3 7% 5% 5% 4 4 5% 6% 28%	2850
July	1st to 10th	Day	22% 9% 2 7% 4 4 5% 4 5% 7% 32%	4760
	11th to 20th	Day	20% 9% 3 7% 3 3 4 4 6% 7% 34%	4486
	21st to end	Day	14% 8% 3 7% 5% 4 5% 4 6% 9% 35%	4666
August	1st to 10th	Day	19% 11% 4 8% 5% 4 5% 4 5% 6% 30%	4105
	11th to 20th	Day	14% 7% 3 7% 5% 4 5% 4 6% 8% 38%	4045
	21st to end	Day	10% 5% 2 6% 4 4 5% 3 5% 7% 50%	4385
September	1st to 10th	Day	15% 6% 3 6% 5% 4 4 3 5% 7% 43%	2280
	11th to 20th	Day	16% 7% 2 7% 4 3 3 3 4 5% 45%	2188
	21st to end	Day	15% 7% 2 6% 4 4 3 3 5% 7% 43%	2043
October	1st to 10th	Day	16% 8% 4 6% 5% 4 4 3 5% 7% 39%	1900
	11th to 20th	Day	19% 9% 3 6% 4 4 5% 5% 5% 7% 34%	1900
	21st to end	Day	19% 12% 3 7% 6% 4 4 3 4 6% 31%	2090
November	1st to 10th	Day	21% 12% 3 8% 6% 5% 4 3 3 6% 29%	1545
	11th to 20th	Day	18% 16% 5% 7% 6% 5% 4 3 4 5% 26%	1520
	21st to end	Day	18% 16% 5% 12% 7% 4 4 4 4 4 21%	1520
December	1st to 10th	Day	24% 15% 7% 11% 6% 4 4 3 4 4 17%	1520
	11th to 20th	Day	26% 17% 6% 11% 6% 5% 4 3 3 3 15%	1906
	21st to end	Day	21% 16% 8% 15% 6% 4 3 3 4 4 15%	2671
January	1st to 10th	Night	14% 15% 5% 13% 8% 6% 5% 3 4 5% 22%	4618
	11th to 20th	Night	19% 15% 6% 15% 6% 6% 5% 3 4 4 16%	4340
	21st to end	Night	16% 14% 5% 14% 7% 7% 6% 3 5% 6% 18%	4532
February	1st to 10th	Night	19% 16% 5% 11% 9% 7% 6% 4 4 4 16%	2470
	11th to 20th	Night	18% 14% 5% 11% 8% 5% 5% 4 6% 5% 20%	2403
	21st to end	Night	12% 14% 5% 11% 7% 5% 5% 3 4 5% 28%	2027
March	1st to 10th	Night	24% 13% 5% 12% 7% 6% 3 2 3 3 23%	3410
	11th to 20th	Night	18% 16% 6% 11% 6% 5% 4 4 5% 5% 19%	3479
	21st to end	Night	30% 11% 6% 8% 6% 4 3 2 3 4 24%	3816
April	1st to 10th	Night	22% 14% 3 8% 5% 5% 4 3 4 5% 27%	1919
	11th to 20th	Night	21% 10% 4 8% 5% 5% 4 3 4 5% 31%	1775
	21st to end	Night	23% 10% 4 7% 5% 4 4 3 4 6% 30%	1710
May	1st to 10th	Night	22% 14% 4 10% 5% 4 4 3 5% 5% 24%	2746
	11th to 20th	Night	18% 9% 3 7% 5% 4 4 4 6% 8% 32%	2506
	21st to end	Night	19% 10% 4 10% 5% 5% 5% 3 5% 6% 27%	2749
June	1st to 10th	Night	23% 11% 3 8% 5% 5% 5% 3 6% 6% 25%	1515
	11th to 20th	Night	21% 9% 3 7% 5% 4 5% 3 5% 6% 35%	1330
	21st to end	Night	22% 11% 4 9% 5% 5% 5% 4 5% 6% 25%	1330
July	1st to 10th	Night	20% 14% 4 8% 5% 5% 4 4 6% 7% 23%	2210
	11th to 20th	Night	21% 10% 3 8% 4 4 5% 4 6% 8% 27%	2448
	21st to end	Night	14% 8% 3 7% 5% 5% 4 4 6% 8% 35%	2891
August	1st to 10th	Night	22% 10% 3 7% 5% 5% 4 4 6% 6% 28%	2825
	11th to 20th	Night	15% 10% 3 8% 5% 4 6% 3 6% 7% 33%	2782
	21st to end	Night	13% 6% 2 6% 4 4 4 4 5% 7% 45%	3270
September	1st to 10th	Night	13% 7% 3 6% 4 4 5% 4 5% 7% 42%	1900
	11th to 20th	Night	17% 7% 2 6% 4 3 4 2 5% 6% 44%	1990
	21st to end	Night	17% 8% 2 7% 5% 4 4 3 5% 7% 38%	2137
October	1st to 10th	Night	17% 6% 3 6% 4 4 5% 4 5% 6% 39%	2280
	11th to 20th	Night	18% 8% 3 7% 5% 4 4 3 5% 7% 35%	2280
	21st to end	Night	25% 11% 3 8% 5% 4 3 3 3 5% 30%	2508
November	1st to 10th	Night	22% 10% 3 8% 5% 5% 4 3 5% 6% 30%	2600
	11th to 20th	Night	19% 14% 5% 10% 6% 5% 5% 4 5% 5% 23%	2660
	21st to end	Night	22% 14% 5% 11% 6% 5% 4 3 3 6% 21%	2660
December	1st to 10th	Night	25% 14% 5% 11% 7% 5% 3 4 4 5% 16%	2660
	11th to 20th	Night	25% 17% 5% 10% 7% 4 4 3 4 4 16%	3293
	21st to end	Night	25% 15% 5% 12% 5% 4 3 3 4 4 19%	4983

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	64% 9% 11% 11% 5%	2313
	11th to 20th	Day	68% 7% 11% 12% 2	2626
	21st to end	Day	60% 10% 13% 9% 7%	3124
February	1st to 10th	Day	69% 4 10% 10% 6% 1	1710
	11th to 20th	Day	66% 7% 11% 10% 5% 1	1671
	21st to end	Day	53% 7% 13% 16% 10% 1	1423
March	1st to 10th	Day	63% 6% 9% 16% 5% 1	3434
	11th to 20th	Day	58% 9% 11% 14% 8% 1	3480
	21st to end	Day	69% 3 6% 12% 8% 1	3816
April	1st to 10th	Day	57% 7% 9% 14% 11% 3	2260
	11th to 20th	Day	50% 5% 10% 22% 12% 1	2352
	21st to end	Day	53% 5% 10% 18% 11% 2	2470
May	1st to 10th	Day	57% 8% 11% 15% 7% 1	4210
	11th to 20th	Day	47% 9% 14% 21% 7% 1	4402
	21st to end	Day	45% 10% 18% 17% 9% 1	4836
June	1st to 10th	Day	56% 7% 11% 18% 6%	2679
	11th to 20th	Day	49% 8% 13% 20% 10% 1	2850
	21st to end	Day	56% 8% 9% 16% 9% 1	2850
July	1st to 10th	Day	50% 6% 13% 18% 11% 1	4685
	11th to 20th	Day	46% 9% 14% 22% 8%	4408
	21st to end	Day	43% 11% 16% 21% 9%	4517
August	1st to 10th	Day	53% 8% 11% 19% 9%	4092
	11th to 20th	Day	43% 9% 13% 23% 11% 1	4084
	21st to end	Day	32% 8% 14% 29% 16% 1	4385
September	1st to 10th	Day	39% 8% 12% 25% 14% 1	2280
	11th to 20th	Day	41% 6% 12% 25% 15% 1	2188
	21st to end	Day	41% 6% 11% 28% 14% 1	2043
October	1st to 10th	Day	42% 8% 13% 25% 11%	3160
	11th to 20th	Day	43% 7% 11% 28% 11%	3140
	21st to end	Day	46% 5% 15% 21% 13%	3428
November	1st to 10th	Day	58% 5% 9% 18% 8% 1	1545
	11th to 20th	Day	60% 7% 12% 14% 7% 1	1520
	21st to end	Day	65% 7% 12% 12% 4	1520
December	1st to 10th	Day	71% 7% 8% 10% 4	1520
	11th to 20th	Day	74% 7% 7% 9% 3 1	1905
	21st to end	Day	70% 9% 11% 7% 3	2671
January	1st to 10th	Night	59% 13% 11% 14% 3	4618
	11th to 20th	Night	68% 9% 8% 10% 5%	4340
	21st to end	Night	65% 8% 11% 13% 3	4532
February	1st to 10th	Night	71% 6% 8% 9% 6% 1	2470
	11th to 20th	Night	64% 7% 12% 12% 6% 1	2406
	21st to end	Night	57% 6% 11% 16% 9% 1	2027
March	1st to 10th	Night	67% 4 7% 13% 8% 1	3419
	11th to 20th	Night	63% 7% 11% 12% 7% 1	3480
	21st to end	Night	67% 3 8% 14% 8% 1	3816
April	1st to 10th	Night	59% 6% 9% 13% 11% 3	1919
	11th to 20th	Night	54% 5% 8% 19% 13% 1	1775
	21st to end	Night	55% 5% 11% 15% 12% 2	1710
May	1st to 10th	Night	59% 8% 14% 12% 6% 1	2752
	11th to 20th	Night	47% 10% 14% 22% 6% 1	2507
	21st to end	Night	52% 8% 17% 17% 5% 1	2750
June	1st to 10th	Night	57% 7% 11% 18% 6%	1515
	11th to 20th	Night	50% 6% 11% 23% 9% 2	1330
	21st to end	Night	57% 8% 12% 16% 6% 2	1330
July	1st to 10th	Night	54% 11% 13% 13% 9% 1	2175
	11th to 20th	Night	49% 11% 16% 16% 9%	2403
	21st to end	Night	43% 8% 14% 23% 11% 1	2800
August	1st to 10th	Night	52% 8% 13% 21% 5%	2813
	11th to 20th	Night	45% 11% 15% 21% 9%	2809
	21st to end	Night	35% 9% 16% 26% 15%	3269
September	1st to 10th	Night	39% 8% 11% 29% 13% 1	1900
	11th to 20th	Night	40% 6% 12% 28% 14% 1	1990
	21st to end	Night	45% 6% 10% 26% 13% 1	2137
October	1st to 10th	Night	46% 6% 12% 25% 10%	3800
	11th to 20th	Night	39% 6% 14% 28% 12%	3779
	21st to end	Night	46% 4 14% 22% 14%	4120
November	1st to 10th	Night	54% 6% 13% 18% 8% 1	2600
	11th to 20th	Night	62% 7% 11% 13% 6%	2660
	21st to end	Night	65% 7% 14% 11% 3	2660
December	1st to 10th	Night	69% 8% 9% 11% 3	2660
	11th to 20th	Night	73% 6% 8% 10% 4	3295
	21st to end	Night	67% 7% 10% 12% 4	4983

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	25% 22% 30% 18% 4	246
	11th to 20th	Day	31% 18% 33% 14% 5% 1	370
	21st to end	Day	20% 13% 38% 26% 3	407
February	1st to 10th	Day	27% 16% 30% 22% 5% 1	370
	11th to 20th	Day	24% 19% 36% 18% 3	366
	21st to end	Day	19% 13% 36% 28% 4	310
March	1st to 10th	Day	21% 19% 34% 21% 5%	460
	11th to 20th	Day	17% 17% 33% 25% 7%	460
	21st to end	Day	26% 14% 32% 22% 6%	506
April	1st to 10th	Day	30% 13% 35% 18% 3 1	460
	11th to 20th	Day	21% 9% 37% 24% 8% 1	452
	21st to end	Day	24% 11% 26% 28% 11% 1	460
May	1st to 10th	Day	27% 9% 30% 25% 7% 2	514
	11th to 20th	Day	23% 5% 28% 29% 14% 2	674
	21st to end	Day	25% 7% 25% 32% 10% 1	735
June	1st to 10th	Day	28% 6% 25% 29% 11% 1	680
	11th to 20th	Day	24% 5% 20% 34% 15% 1	680
	21st to end	Day	29% 6% 18% 31% 12% 3	680
July	1st to 10th	Day	22% 3 19% 36% 19% 1	670
	11th to 20th	Day	20% 4 18% 34% 21% 2	668
	21st to end	Day	21% 3 17% 37% 20% 2	653
August	1st to 10th	Day	16% 5% 13% 39% 25% 2	486
	11th to 20th	Day	20% 4 20% 33% 19% 4	479
	21st to end	Day	14% 5% 22% 33% 21% 4	539
September	1st to 10th	Day	16% 5% 24% 36% 17% 3	490
	11th to 20th	Day	18% 6% 24% 30% 17% 4	490
	21st to end	Day	19% 7% 24% 26% 20% 3	465
October	1st to 10th	Day	21% 8% 23% 30% 15% 3	390
	11th to 20th	Day	21% 12% 28% 25% 13% 1	390
	21st to end	Day	24% 12% 32% 22% 8% 1	429
November	1st to 10th	Day	24% 13% 32% 22% 8% 1	374
	11th to 20th	Day	28% 20% 27% 18% 7%	370
	21st to end	Day	28% 18% 36% 15% 2 1	370
December	1st to 10th	Day	35% 14% 32% 16% 2 1	370
	11th to 20th	Day	36% 22% 28% 13% 2	370
	21st to end	Day	28% 16% 34% 17% 4 1	334
January	1st to 10th	Night	27% 20% 33% 18% 3	850
	11th to 20th	Night	29% 18% 31% 18% 4	821
	21st to end	Night	21% 20% 38% 16% 5%	836
February	1st to 10th	Night	26% 19% 35% 17% 3	760
	11th to 20th	Night	26% 19% 36% 16% 2 1	743
	21st to end	Night	19% 16% 38% 22% 5%	628
March	1st to 10th	Night	23% 17% 37% 21% 3	760
	11th to 20th	Night	21% 16% 30% 25% 7%	760
	21st to end	Night	24% 13% 33% 22% 7%	836
April	1st to 10th	Night	28% 14% 33% 20% 5%	589
	11th to 20th	Night	25% 11% 34% 24% 6%	564
	21st to end	Night	29% 8% 34% 21% 7% 1	570
May	1st to 10th	Night	29% 7% 29% 26% 7% 1	570
	11th to 20th	Night	27% 6% 25% 30% 11% 1	562
	21st to end	Night	21% 6% 34% 31% 7%	616
June	1st to 10th	Night	27% 8% 25% 30% 9% 1	565
	11th to 20th	Night	23% 6% 22% 38% 10% 1	380
	21st to end	Night	24% 5% 19% 39% 12% 1	380
July	1st to 10th	Night	23% 4 19% 39% 15% 1	370
	11th to 20th	Night	19% 5% 20% 40% 15% 1	499
	21st to end	Night	19% 5% 18% 42% 16%	623
August	1st to 10th	Night	17% 3 21% 41% 16% 1	568
	11th to 20th	Night	20% 4 24% 33% 17% 2	562
	21st to end	Night	16% 5% 21% 34% 22% 2	627
September	1st to 10th	Night	16% 5% 28% 34% 16% 1	570
	11th to 20th	Night	18% 6% 24% 34% 16% 1	660
	21st to end	Night	21% 9% 27% 28% 12% 2	760
October	1st to 10th	Night	21% 7% 30% 30% 11% 1	760
	11th to 20th	Night	22% 11% 34% 22% 9% 2	760
	21st to end	Night	32% 15% 27% 20% 6%	836
November	1st to 10th	Night	26% 14% 32% 22% 6% 1	834
	11th to 20th	Night	24% 18% 33% 18% 6% 1	850
	21st to end	Night	29% 18% 31% 19% 3	850
December	1st to 10th	Night	33% 16% 31% 17% 3	850
	11th to 20th	Night	30% 22% 32% 13% 2	850
	21st to end	Night	29% 19% 29% 19% 4	935

Page generated at 2024-11-01 23:47:45. Version ac07

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