Smiley's Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Smiley's Provincial Park clear sky chart from 2005-11-06 to 2024-03-01.

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	20% 12% 5% 8% 6% 3 4 4 4 6% 28%	78823
	Night	19% 12% 5% 9% 7% 3 4 4 4 6% 26%	80604
Transparency	Day	57% 6% 11% 17% 8% 1	78527
	Night	58% 6% 11% 16% 7% 1	80435
Seeing	Day	30% 19% 30% 15% 5% 1	16337
	Night	27% 17% 31% 20% 5%	23897

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	14% 19% 7% 13% 9% 4 4 3 3 3 21%	2526
	11th to 20th	Day	15% 14% 8% 19% 8% 4 5% 4 4 4 14%	2603
	21st to end	Day	17% 13% 8% 11% 9% 5% 5% 4 3 5% 20%	3124
February	1st to 10th	Day	19% 16% 6% 10% 10% 5% 5% 5% 4 4 17%	1710
	11th to 20th	Day	17% 16% 6% 12% 9% 4 4 4 4 5% 19%	1663
	21st to end	Day	11% 15% 6% 9% 8% 4 3 3 5% 6% 28%	1437
March	1st to 10th	Day	16% 20% 6% 9% 8% 3 4 3 3 4 23%	1965
	11th to 20th	Day	15% 12% 7% 11% 7% 4 4 4 4 5% 27%	1980
	21st to end	Day	19% 19% 6% 8% 5% 2 3 3 3 4 29%	2178
April	1st to 10th	Day	24% 16% 5% 7% 7% 2 4 4 4 5% 23%	2153
	11th to 20th	Day	21% 12% 3 6% 5% 3 4 4 5% 6% 31%	2199
	21st to end	Day	23% 13% 4 7% 5% 3 4 4 5% 6% 26%	2340
May	1st to 10th	Day	25% 13% 3 7% 6% 3 4 4 4 6% 25%	2398
	11th to 20th	Day	23% 11% 3 6% 5% 3 4 4 5% 6% 33%	2478
	21st to end	Day	21% 10% 3 6% 5% 3 5% 5% 5% 8% 29%	2724
June	1st to 10th	Day	26% 10% 3 6% 6% 3 5% 4 5% 6% 25%	2520
	11th to 20th	Day	22% 10% 3 6% 5% 3 4 3 5% 7% 32%	2631
	21st to end	Day	25% 9% 4 7% 5% 3 4 4 5% 7% 27%	2700
July	1st to 10th	Day	18% 6% 2 5% 5% 4 5% 5% 6% 9% 34%	2651
	11th to 20th	Day	15% 8% 3 6% 5% 3 6% 5% 6% 9% 34%	2520
	21st to end	Day	19% 9% 3 6% 6% 3 6% 6% 6% 8% 27%	2675
August	1st to 10th	Day	18% 6% 3 6% 5% 3 5% 5% 6% 8% 34%	2327
	11th to 20th	Day	17% 8% 3 6% 6% 4 5% 5% 6% 7% 33%	2304
	21st to end	Day	15% 6% 4 5% 4 3 4 4 5% 8% 42%	2477
September	1st to 10th	Day	18% 6% 2 5% 5% 3 4 4 5% 7% 41%	2160
	11th to 20th	Day	19% 7% 3 5% 4 2 4 3 5% 6% 41%	2094
	21st to end	Day	19% 7% 2 4 4 3 3 4 4 7% 42%	1922
October	1st to 10th	Day	19% 8% 2 5% 5% 3 5% 4 4 7% 38%	1800
	11th to 20th	Day	20% 10% 3 6% 5% 3 4 5% 6% 7% 31%	1800
	21st to end	Day	21% 14% 4 7% 6% 2 4 4 4 5% 28%	1980
November	1st to 10th	Day	22% 13% 3 7% 7% 4 5% 4 3 5% 27%	1535
	11th to 20th	Day	20% 18% 6% 7% 5% 2 4 4 5% 5% 24%	1520
	21st to end	Day	18% 17% 6% 8% 8% 4 5% 4 4 5% 21%	1520
December	1st to 10th	Day	24% 18% 8% 10% 7% 3 3 3 3 4 17%	1520
	11th to 20th	Day	28% 16% 7% 9% 10% 3 4 4 3 3 12%	1906
	21st to end	Day	23% 14% 11% 12% 8% 3 3 3 2 5% 15%	2783
January	1st to 10th	Night	15% 14% 8% 14% 10% 3 4 4 4 5% 19%	4429
	11th to 20th	Night	16% 17% 6% 18% 7% 4 5% 4 4 4 15%	4362
	21st to end	Night	17% 13% 7% 14% 11% 3 5% 4 4 5% 18%	4532
February	1st to 10th	Night	19% 13% 6% 12% 11% 4 6% 4 4 4 16%	2470
	11th to 20th	Night	17% 15% 6% 11% 10% 5% 5% 4 4 5% 18%	2403
	21st to end	Night	12% 14% 7% 11% 9% 4 4 4 4 5% 26%	2017
March	1st to 10th	Night	16% 15% 5% 9% 9% 4 4 4 4 5% 25%	1988
	11th to 20th	Night	17% 11% 5% 9% 6% 4 5% 5% 4 7% 26%	1979
	21st to end	Night	18% 15% 6% 8% 5% 2 4 3 3 5% 31%	2178
April	1st to 10th	Night	23% 14% 4 7% 6% 3 5% 4 4 5% 25%	1806
	11th to 20th	Night	23% 12% 4 6% 6% 2 4 3 4 5% 32%	1707
	21st to end	Night	23% 12% 4 6% 5% 3 4 5% 4 5% 29%	1620
May	1st to 10th	Night	23% 13% 3 6% 6% 3 4 5% 4 5% 28%	1560
	11th to 20th	Night	23% 10% 3 5% 4 4 4 4 6% 6% 31%	1416
	21st to end	Night	16% 8% 4 7% 6% 3 5% 5% 5% 8% 32%	1550
June	1st to 10th	Night	25% 8% 3 5% 4 3 5% 4 6% 8% 27%	1440
	11th to 20th	Night	21% 8% 4 6% 5% 3 4 5% 5% 6% 34%	1341
	21st to end	Night	22% 9% 4 7% 7% 3 5% 5% 5% 7% 26%	1260
July	1st to 10th	Night	17% 6% 3 5% 6% 3 4 6% 7% 10% 34%	1286
	11th to 20th	Night	15% 6% 3 6% 6% 3 6% 6% 8% 9% 32%	1440
	21st to end	Night	17% 7% 4 7% 6% 3 5% 5% 6% 9% 32%	1640
August	1st to 10th	Night	16% 6% 3 6% 4 3 4 6% 5% 7% 39%	1612
	11th to 20th	Night	15% 9% 4 8% 6% 3 5% 5% 5% 8% 32%	1596
	21st to end	Night	15% 6% 2 5% 4 3 5% 4 5% 7% 43%	1878
September	1st to 10th	Night	14% 6% 3 4 6% 3 4 5% 5% 8% 43%	1800
	11th to 20th	Night	18% 7% 3 5% 4 2 3 4 4 7% 42%	1862
	21st to end	Night	17% 8% 3 5% 5% 3 3 4 5% 6% 41%	2038
October	1st to 10th	Night	19% 6% 2 5% 6% 3 4 5% 5% 6% 39%	2160
	11th to 20th	Night	20% 8% 3 5% 5% 3 5% 4 5% 7% 35%	2160
	21st to end	Night	24% 11% 3 7% 5% 3 4 4 4 6% 29%	2376
November	1st to 10th	Night	22% 12% 3 6% 6% 2 4 4 4 6% 30%	2541
	11th to 20th	Night	19% 16% 5% 9% 7% 3 5% 4 4 5% 23%	2660
	21st to end	Night	20% 15% 6% 9% 7% 3 4 5% 4 5% 23%	2660
December	1st to 10th	Night	24% 15% 6% 11% 8% 3 4 4 4 4 16%	2660
	11th to 20th	Night	28% 17% 6% 11% 8% 3 3 2 3 3 16%	3293
	21st to end	Night	26% 15% 8% 10% 6% 2 3 3 3 3 20%	4884

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	67% 5% 16% 9% 3	2527
	11th to 20th	Day	71% 7% 8% 11% 2	2603
	21st to end	Day	64% 6% 10% 11% 8%	3124
February	1st to 10th	Day	69% 5% 9% 9% 6% 1	1710
	11th to 20th	Day	67% 6% 9% 11% 6%	1671
	21st to end	Day	56% 5% 11% 16% 9% 2	1437
March	1st to 10th	Day	66% 4 8% 14% 8% 1	1969
	11th to 20th	Day	60% 5% 10% 15% 10% 1	1980
	21st to end	Day	60% 4 7% 17% 10% 2	2178
April	1st to 10th	Day	65% 5% 6% 12% 10% 2	2153
	11th to 20th	Day	52% 6% 9% 19% 12% 1	2199
	21st to end	Day	59% 6% 9% 16% 9% 1	2340
May	1st to 10th	Day	61% 5% 9% 16% 9% 1	2398
	11th to 20th	Day	51% 6% 10% 20% 12%	2482
	21st to end	Day	55% 6% 11% 19% 8% 1	2724
June	1st to 10th	Day	60% 6% 11% 17% 6%	2520
	11th to 20th	Day	53% 6% 12% 19% 10% 1	2631
	21st to end	Day	57% 8% 10% 15% 9%	2700
July	1st to 10th	Day	45% 9% 15% 20% 11% 1	2578
	11th to 20th	Day	46% 8% 15% 23% 7% 1	2444
	21st to end	Day	52% 9% 14% 20% 5% 1	2525
August	1st to 10th	Day	47% 8% 15% 21% 9%	2314
	11th to 20th	Day	49% 9% 15% 20% 8%	2304
	21st to end	Day	40% 6% 14% 27% 11% 1	2477
September	1st to 10th	Day	42% 5% 14% 24% 13% 2	2160
	11th to 20th	Day	44% 6% 12% 23% 14% 1	2094
	21st to end	Day	43% 5% 11% 25% 16%	1922
October	1st to 10th	Day	47% 5% 11% 26% 11%	1800
	11th to 20th	Day	50% 8% 13% 22% 7%	1800
	21st to end	Day	58% 6% 10% 18% 7% 1	1980
November	1st to 10th	Day	60% 7% 8% 18% 7% 1	1535
	11th to 20th	Day	61% 6% 12% 14% 6% 1	1520
	21st to end	Day	64% 8% 13% 11% 4	1520
December	1st to 10th	Day	71% 6% 9% 12% 3	1520
	11th to 20th	Day	76% 5% 7% 8% 3 1	1905
	21st to end	Day	72% 6% 11% 8% 3	2783
January	1st to 10th	Night	64% 8% 12% 14% 2	4429
	11th to 20th	Night	72% 7% 8% 9% 4	4362
	21st to end	Night	66% 7% 9% 12% 5% 1	4532
February	1st to 10th	Night	70% 5% 9% 9% 6% 1	2470
	11th to 20th	Night	67% 5% 12% 10% 5% 1	2406
	21st to end	Night	59% 5% 11% 17% 8% 1	2017
March	1st to 10th	Night	62% 6% 10% 14% 8% 1	1997
	11th to 20th	Night	56% 6% 12% 14% 10% 1	1980
	21st to end	Night	57% 5% 10% 17% 10% 2	2178
April	1st to 10th	Night	61% 6% 9% 12% 10% 3	1806
	11th to 20th	Night	55% 4 9% 17% 13% 1	1707
	21st to end	Night	57% 5% 10% 15% 11% 1	1620
May	1st to 10th	Night	58% 5% 10% 17% 8% 1	1560
	11th to 20th	Night	52% 6% 10% 21% 10% 1	1417
	21st to end	Night	50% 8% 15% 19% 6% 1	1551
June	1st to 10th	Night	55% 7% 13% 19% 6%	1440
	11th to 20th	Night	51% 5% 13% 19% 11% 1	1341
	21st to end	Night	56% 8% 13% 15% 7% 1	1260
July	1st to 10th	Night	43% 11% 18% 19% 9%	1250
	11th to 20th	Night	46% 9% 16% 20% 9% 1	1392
	21st to end	Night	48% 9% 17% 18% 7% 1	1550
August	1st to 10th	Night	42% 8% 16% 26% 8%	1600
	11th to 20th	Night	48% 10% 15% 19% 8%	1596
	21st to end	Night	40% 7% 17% 26% 11%	1878
September	1st to 10th	Night	40% 7% 13% 26% 12% 2	1800
	11th to 20th	Night	40% 6% 11% 28% 13% 1	1862
	21st to end	Night	44% 6% 11% 26% 13% 1	2038
October	1st to 10th	Night	46% 6% 11% 24% 13% 1	2160
	11th to 20th	Night	48% 5% 14% 26% 7%	2160
	21st to end	Night	56% 6% 11% 16% 10%	2376
November	1st to 10th	Night	54% 6% 13% 17% 9% 1	2541
	11th to 20th	Night	62% 6% 12% 14% 6%	2660
	21st to end	Night	63% 6% 15% 13% 3	2660
December	1st to 10th	Night	70% 6% 11% 11% 2	2660
	11th to 20th	Night	74% 5% 7% 10% 4	3295
	21st to end	Night	68% 6% 9% 14% 3	4884

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	34% 22% 30% 13% 1	370
	11th to 20th	Day	37% 21% 28% 10% 4	370
	21st to end	Day	27% 25% 33% 13% 2	407
February	1st to 10th	Day	34% 25% 26% 12% 2	370
	11th to 20th	Day	39% 27% 23% 10% 2	366
	21st to end	Day	27% 24% 34% 12% 3 1	307
March	1st to 10th	Day	32% 26% 31% 8% 2	416
	11th to 20th	Day	28% 31% 25% 10% 5%	420
	21st to end	Day	36% 28% 24% 9% 3	462
April	1st to 10th	Day	44% 23% 25% 7% 1	420
	11th to 20th	Day	33% 27% 27% 10% 2	412
	21st to end	Day	34% 22% 26% 13% 5%	420
May	1st to 10th	Day	41% 21% 25% 9% 4 1	481
	11th to 20th	Day	30% 19% 29% 18% 3 1	624
	21st to end	Day	30% 17% 34% 15% 3 1	680
June	1st to 10th	Day	33% 18% 30% 15% 4	630
	11th to 20th	Day	30% 15% 32% 18% 4 1	630
	21st to end	Day	32% 11% 31% 18% 6% 2	630
July	1st to 10th	Day	22% 11% 38% 21% 8% 1	620
	11th to 20th	Day	20% 10% 38% 22% 8% 1	618
	21st to end	Day	22% 10% 37% 23% 7% 1	615
August	1st to 10th	Day	17% 9% 39% 27% 8% 1	446
	11th to 20th	Day	23% 10% 34% 20% 10% 2	439
	21st to end	Day	17% 15% 32% 23% 10% 2	495
September	1st to 10th	Day	19% 14% 34% 24% 8% 1	450
	11th to 20th	Day	28% 16% 29% 18% 7% 2	450
	21st to end	Day	24% 16% 31% 17% 9% 2	421
October	1st to 10th	Day	23% 15% 32% 18% 9% 2	360
	11th to 20th	Day	28% 19% 30% 15% 7% 2	360
	21st to end	Day	32% 24% 26% 13% 5% 1	396
November	1st to 10th	Day	32% 18% 29% 15% 6% 1	365
	11th to 20th	Day	38% 20% 26% 10% 5% 1	370
	21st to end	Day	36% 25% 26% 10% 2 1	370
December	1st to 10th	Day	41% 19% 27% 11% 2 1	370
	11th to 20th	Day	45% 21% 24% 9% 1	370
	21st to end	Day	37% 23% 28% 9% 3 1	407
January	1st to 10th	Night	31% 20% 32% 14% 2	850
	11th to 20th	Night	30% 24% 29% 15% 2	826
	21st to end	Night	25% 25% 31% 17% 2	836
February	1st to 10th	Night	31% 22% 29% 16% 2	760
	11th to 20th	Night	34% 26% 27% 13% 1	743
	21st to end	Night	22% 24% 31% 20% 4	628
March	1st to 10th	Night	26% 26% 32% 14% 2	723
	11th to 20th	Night	25% 20% 31% 19% 4	720
	21st to end	Night	29% 17% 33% 16% 4	792
April	1st to 10th	Night	33% 20% 28% 17% 3	546
	11th to 20th	Night	30% 21% 31% 15% 3	534
	21st to end	Night	29% 21% 29% 17% 4	540
May	1st to 10th	Night	30% 17% 31% 18% 4 1	540
	11th to 20th	Night	29% 13% 31% 23% 4	532
	21st to end	Night	20% 17% 41% 19% 2	583
June	1st to 10th	Night	29% 14% 32% 22% 3	540
	11th to 20th	Night	24% 11% 36% 26% 3	441
	21st to end	Night	25% 6% 31% 31% 6%	360
July	1st to 10th	Night	19% 5% 37% 31% 8%	375
	11th to 20th	Night	17% 7% 37% 32% 7%	522
	21st to end	Night	18% 6% 33% 34% 8%	590
August	1st to 10th	Night	17% 6% 32% 35% 9% 1	538
	11th to 20th	Night	18% 9% 28% 33% 11% 1	532
	21st to end	Night	16% 8% 29% 35% 12%	594
September	1st to 10th	Night	16% 10% 33% 31% 10%	540
	11th to 20th	Night	21% 11% 28% 28% 11% 1	602
	21st to end	Night	24% 12% 31% 24% 9% 1	720
October	1st to 10th	Night	22% 11% 31% 26% 8% 1	720
	11th to 20th	Night	23% 16% 34% 19% 7% 1	720
	21st to end	Night	33% 18% 29% 17% 4	792
November	1st to 10th	Night	31% 15% 28% 19% 6% 1	823
	11th to 20th	Night	31% 20% 26% 19% 4	850
	21st to end	Night	31% 22% 27% 17% 2	850
December	1st to 10th	Night	35% 19% 29% 15% 3	850
	11th to 20th	Night	35% 25% 27% 11% 2	850
	21st to end	Night	33% 21% 28% 15% 3 1	935

Page generated at 2024-02-27 07:30:17. Version ac07

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