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 2024-04-10.

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	19% 10% 4 8% 6% 4 5% 4 5% 6% 29%	83378
	Night	20% 11% 5% 9% 7% 4 5% 4 4 6% 25%	85384
Transparency	Day	55% 7% 11% 18% 8% 1	83079
	Night	59% 7% 11% 16% 7% 1	85218
Seeing	Day	24% 10% 27% 27% 11% 1	16293
	Night	25% 13% 30% 24% 8% 1	23912

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% 15% 7% 10% 7% 4 5% 5% 3 4 22%	2312
	11th to 20th	Day	16% 14% 7% 14% 10% 5% 7% 4 5% 5% 13%	2626
	21st to end	Day	15% 11% 6% 11% 11% 6% 6% 5% 5% 6% 19%	3124
February	1st to 10th	Day	19% 13% 5% 10% 10% 5% 6% 5% 5% 5% 16%	1710
	11th to 20th	Day	16% 13% 5% 12% 9% 5% 6% 6% 5% 5% 20%	1663
	21st to end	Day	11% 10% 5% 10% 8% 4 5% 5% 4 8% 29%	1423
March	1st to 10th	Day	22% 12% 5% 8% 7% 6% 5% 4 4 5% 22%	3430
	11th to 20th	Day	13% 15% 6% 9% 7% 4 5% 4 4 6% 26%	3480
	21st to end	Day	28% 13% 5% 8% 6% 3 5% 3 3 4 21%	3816
April	1st to 10th	Day	22% 11% 4 7% 6% 3 4 4 4 7% 27%	2251
	11th to 20th	Day	19% 8% 4 7% 5% 3 4 4 5% 7% 34%	2226
	21st to end	Day	20% 10% 3 7% 6% 4 5% 5% 5% 6% 29%	2340
May	1st to 10th	Day	21% 10% 5% 7% 6% 3 4 4 6% 6% 27%	2388
	11th to 20th	Day	20% 9% 3 6% 5% 3 4 4 4 6% 36%	2478
	21st to end	Day	18% 8% 3 7% 6% 3 5% 4 5% 8% 32%	2724
June	1st to 10th	Day	22% 9% 3 7% 6% 4 5% 6% 5% 6% 27%	2538
	11th to 20th	Day	21% 7% 4 6% 5% 3 4 4 6% 7% 33%	2700
	21st to end	Day	23% 9% 3 6% 6% 4 4 5% 5% 6% 29%	2700
July	1st to 10th	Day	16% 7% 2 6% 5% 3 5% 5% 6% 9% 38%	2700
	11th to 20th	Day	16% 7% 3 7% 5% 3 5% 5% 7% 8% 35%	2552
	21st to end	Day	18% 8% 4 6% 6% 3 5% 5% 6% 8% 31%	2663
August	1st to 10th	Day	13% 6% 3 6% 5% 3 5% 5% 6% 8% 39%	2327
	11th to 20th	Day	16% 8% 3 6% 6% 2 5% 5% 6% 8% 36%	2304
	21st to end	Day	13% 6% 2 6% 4 2 4 4 4 7% 47%	2497
September	1st to 10th	Day	14% 6% 3 5% 5% 3 4 5% 5% 7% 43%	2160
	11th to 20th	Day	16% 7% 2 7% 5% 2 4 4 4 5% 44%	2073
	21st to end	Day	16% 7% 3 5% 5% 3 3 4 5% 7% 44%	1936
October	1st to 10th	Day	17% 7% 3 6% 6% 3 4 4 5% 7% 40%	1800
	11th to 20th	Day	19% 9% 3 5% 5% 3 4 6% 5% 7% 33%	1800
	21st to end	Day	20% 11% 3 7% 6% 3 4 5% 4 6% 30%	1980
November	1st to 10th	Day	21% 12% 4 7% 6% 4 4 4 3 6% 29%	1520
	11th to 20th	Day	19% 14% 5% 7% 7% 3 5% 4 4 6% 26%	1520
	21st to end	Day	18% 15% 6% 10% 9% 3 5% 4 4 4 22%	1520
December	1st to 10th	Day	24% 14% 7% 11% 7% 3 4 4 4 4 18%	1520
	11th to 20th	Day	27% 16% 7% 10% 7% 4 4 4 3 3 15%	1906
	21st to end	Day	21% 15% 8% 14% 8% 3 4 4 4 4 15%	2671
January	1st to 10th	Night	15% 14% 6% 12% 9% 4 5% 4 4 5% 22%	4618
	11th to 20th	Night	19% 14% 7% 12% 8% 4 6% 5% 4 4 16%	4340
	21st to end	Night	16% 13% 5% 11% 9% 6% 6% 4 5% 6% 18%	4532
February	1st to 10th	Night	19% 15% 6% 10% 10% 5% 6% 5% 4 5% 16%	2470
	11th to 20th	Night	18% 12% 5% 10% 9% 4 6% 5% 5% 5% 20%	2403
	21st to end	Night	13% 12% 6% 10% 8% 4 5% 5% 4 5% 28%	2027
March	1st to 10th	Night	24% 12% 6% 11% 8% 5% 3 3 3 3 23%	3410
	11th to 20th	Night	19% 15% 7% 10% 7% 4 5% 4 5% 5% 19%	3479
	21st to end	Night	30% 11% 6% 8% 6% 3 3 3 3 4 24%	3816
April	1st to 10th	Night	23% 13% 4 7% 5% 4 4 4 4 5% 26%	1918
	11th to 20th	Night	21% 10% 4 7% 5% 3 5% 4 4 5% 31%	1681
	21st to end	Night	23% 10% 4 6% 6% 3 4 4 5% 6% 29%	1620
May	1st to 10th	Night	24% 9% 4 7% 5% 4 4 4 5% 6% 28%	1571
	11th to 20th	Night	24% 9% 3 6% 6% 3 4 4 5% 7% 31%	1416
	21st to end	Night	18% 9% 4 7% 6% 4 3 6% 5% 7% 31%	1550
June	1st to 10th	Night	23% 10% 3 7% 7% 3 6% 4 5% 7% 25%	1436
	11th to 20th	Night	22% 8% 4 6% 6% 3 4 4 4 5% 34%	1260
	21st to end	Night	22% 9% 4 8% 6% 3 5% 5% 5% 6% 26%	1260
July	1st to 10th	Night	16% 8% 4 5% 7% 4 4 6% 7% 10% 28%	1260
	11th to 20th	Night	15% 7% 4 8% 6% 4 6% 6% 6% 8% 28%	1386
	21st to end	Night	16% 9% 4 7% 8% 5% 6% 6% 6% 8% 25%	1652
August	1st to 10th	Night	15% 6% 3 6% 6% 4 5% 5% 7% 7% 36%	1612
	11th to 20th	Night	16% 11% 4 8% 7% 3 6% 5% 6% 8% 28%	1596
	21st to end	Night	14% 6% 3 6% 5% 3 5% 5% 5% 7% 40%	1858
September	1st to 10th	Night	12% 7% 3 6% 5% 3 6% 5% 5% 7% 41%	1800
	11th to 20th	Night	17% 6% 2 6% 5% 2 4 3 5% 6% 43%	1885
	21st to end	Night	17% 8% 2 5% 6% 3 4 4 5% 7% 39%	2024
October	1st to 10th	Night	17% 6% 3 5% 5% 3 5% 5% 5% 6% 40%	2160
	11th to 20th	Night	18% 8% 3 6% 6% 3 4 5% 5% 7% 34%	2160
	21st to end	Night	27% 10% 3 7% 6% 3 3 4 3 5% 29%	2376
November	1st to 10th	Night	22% 9% 4 7% 6% 4 4 4 5% 6% 30%	2552
	11th to 20th	Night	19% 13% 5% 8% 7% 4 6% 5% 4 5% 23%	2660
	21st to end	Night	22% 13% 5% 9% 7% 4 5% 4 3 6% 21%	2660
December	1st to 10th	Night	25% 13% 6% 10% 8% 4 4 4 4 5% 16%	2660
	11th to 20th	Night	25% 17% 5% 9% 8% 3 5% 4 4 4 16%	3293
	21st to end	Night	25% 14% 6% 11% 6% 3 4 4 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% 13% 11% 3	2251
	11th to 20th	Day	50% 5% 10% 22% 13% 1	2226
	21st to end	Day	55% 5% 10% 18% 9% 1	2340
May	1st to 10th	Day	56% 6% 9% 17% 10% 1	2388
	11th to 20th	Day	49% 7% 10% 23% 11% 1	2482
	21st to end	Day	51% 8% 12% 20% 8% 1	2724
June	1st to 10th	Day	57% 7% 11% 19% 6%	2538
	11th to 20th	Day	50% 7% 13% 19% 10% 1	2700
	21st to end	Day	55% 8% 10% 17% 10% 1	2700
July	1st to 10th	Day	42% 8% 16% 22% 11% 1	2625
	11th to 20th	Day	43% 9% 15% 22% 10% 1	2474
	21st to end	Day	50% 8% 12% 22% 7%	2514
August	1st to 10th	Day	42% 9% 14% 24% 11%	2314
	11th to 20th	Day	45% 9% 15% 23% 8%	2304
	21st to end	Day	36% 7% 15% 29% 12% 1	2497
September	1st to 10th	Day	39% 8% 13% 25% 14% 1	2160
	11th to 20th	Day	42% 6% 12% 24% 15% 1	2073
	21st to end	Day	41% 5% 10% 28% 15% 1	1936
October	1st to 10th	Day	44% 7% 12% 27% 10% 1	1800
	11th to 20th	Day	50% 8% 12% 23% 7%	1800
	21st to end	Day	56% 6% 11% 19% 8%	1980
November	1st to 10th	Day	58% 5% 9% 18% 8% 1	1520
	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% 12% 11% 3	1918
	11th to 20th	Night	55% 5% 7% 18% 14% 1	1681
	21st to end	Night	56% 5% 11% 15% 11% 2	1620
May	1st to 10th	Night	58% 6% 11% 17% 8% 1	1571
	11th to 20th	Night	52% 7% 8% 23% 9% 1	1417
	21st to end	Night	51% 7% 13% 20% 8% 1	1551
June	1st to 10th	Night	57% 7% 11% 19% 6%	1436
	11th to 20th	Night	51% 6% 10% 23% 9% 2	1260
	21st to end	Night	57% 8% 12% 16% 6% 2	1260
July	1st to 10th	Night	45% 12% 17% 18% 8%	1225
	11th to 20th	Night	46% 11% 15% 20% 9%	1341
	21st to end	Night	52% 8% 14% 18% 7%	1561
August	1st to 10th	Night	43% 8% 15% 27% 8%	1600
	11th to 20th	Night	50% 11% 15% 18% 6%	1596
	21st to end	Night	40% 9% 15% 27% 10%	1858
September	1st to 10th	Night	39% 8% 11% 29% 11% 1	1800
	11th to 20th	Night	41% 6% 12% 27% 13% 1	1885
	21st to end	Night	44% 6% 10% 26% 13% 1	2024
October	1st to 10th	Night	44% 6% 13% 24% 13%	2160
	11th to 20th	Night	49% 6% 14% 25% 6%	2160
	21st to end	Night	59% 5% 10% 16% 10% 1	2376
November	1st to 10th	Night	55% 6% 13% 18% 8% 1	2552
	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% 14% 35% 18% 3 1	457
	11th to 20th	Day	22% 8% 38% 24% 8% 1	412
	21st to end	Day	25% 9% 26% 27% 11% 1	420
May	1st to 10th	Day	27% 9% 30% 25% 6% 2	471
	11th to 20th	Day	24% 5% 29% 28% 12% 1	624
	21st to end	Day	26% 6% 26% 30% 11% 1	680
June	1st to 10th	Day	29% 5% 25% 29% 11% 1	630
	11th to 20th	Day	25% 5% 21% 33% 15% 1	630
	21st to end	Day	28% 6% 19% 31% 13% 3	630
July	1st to 10th	Day	21% 3 20% 37% 17% 1	620
	11th to 20th	Day	20% 5% 17% 34% 21% 2	618
	21st to end	Day	22% 2 17% 37% 19% 2	603
August	1st to 10th	Day	15% 4 13% 41% 25% 3	446
	11th to 20th	Day	21% 4 20% 34% 17% 3	439
	21st to end	Day	15% 5% 23% 31% 23% 3	495
September	1st to 10th	Day	15% 5% 24% 37% 17% 3	450
	11th to 20th	Day	20% 6% 26% 30% 15% 3	450
	21st to end	Day	20% 7% 26% 26% 18% 3	428
October	1st to 10th	Day	21% 9% 24% 30% 13% 3	360
	11th to 20th	Day	21% 11% 29% 24% 14% 1	360
	21st to end	Day	25% 13% 33% 20% 8% 1	396
November	1st to 10th	Day	24% 13% 32% 23% 7% 1	365
	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% 32% 20% 5%	589
	11th to 20th	Night	25% 11% 34% 24% 6%	534
	21st to end	Night	30% 8% 34% 20% 7% 1	540
May	1st to 10th	Night	29% 7% 29% 26% 7% 1	540
	11th to 20th	Night	28% 7% 26% 29% 10% 1	532
	21st to end	Night	22% 6% 34% 31% 7% 1	583
June	1st to 10th	Night	27% 8% 25% 30% 9% 1	536
	11th to 20th	Night	24% 5% 23% 38% 9% 1	360
	21st to end	Night	24% 5% 19% 38% 12% 1	360
July	1st to 10th	Night	22% 4 19% 39% 15% 1	350
	11th to 20th	Night	18% 5% 21% 40% 15% 1	471
	21st to end	Night	20% 5% 19% 42% 15%	590
August	1st to 10th	Night	16% 3 22% 42% 17% 1	538
	11th to 20th	Night	20% 4 25% 33% 16% 2	532
	21st to end	Night	17% 5% 21% 34% 22% 2	594
September	1st to 10th	Night	15% 5% 28% 34% 16% 1	540
	11th to 20th	Night	19% 6% 25% 33% 15% 1	625
	21st to end	Night	21% 9% 28% 29% 11% 2	720
October	1st to 10th	Night	20% 7% 30% 30% 11% 1	720
	11th to 20th	Night	22% 11% 34% 22% 10% 2	720
	21st to end	Night	33% 14% 28% 20% 5%	792
November	1st to 10th	Night	26% 14% 32% 21% 6% 1	817
	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 2024-04-07 10:28:13. Version ac07

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