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 2024-11-01.

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% 13% 4 9% 5% 4 4 3 5% 6% 27%	102080
	Night	19% 13% 4 10% 6% 4 4 3 4 5% 27%	96951
Transparency	Day	57% 6% 11% 17% 8% 1	101837
	Night	58% 6% 12% 16% 7% 1	96814
Seeing	Day	30% 19% 30% 15% 5% 1	17364
	Night	27% 17% 30% 20% 5%	24684

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% 20% 6% 14% 8% 5% 3 3 3 3 21%	2526
	11th to 20th	Day	15% 15% 7% 22% 6% 5% 5% 3 4 4 14%	2603
	21st to end	Day	17% 14% 8% 13% 8% 6% 4 3 4 5% 20%	3124
February	1st to 10th	Day	18% 17% 6% 10% 9% 7% 4 4 4 4 17%	1710
	11th to 20th	Day	17% 17% 6% 14% 7% 5% 3 4 4 5% 19%	1663
	21st to end	Day	11% 16% 5% 9% 9% 5% 3 3 5% 6% 28%	1437
March	1st to 10th	Day	25% 17% 4 8% 5% 6% 2 2 4 4 23%	3419
	11th to 20th	Day	13% 24% 7% 11% 5% 5% 4 3 4 4 21%	3480
	21st to end	Day	28% 19% 5% 10% 4 3 3 2 2 3 20%	3816
April	1st to 10th	Day	23% 17% 4 8% 6% 3 3 3 4 4 24%	2273
	11th to 20th	Day	20% 14% 3 7% 4 4 3 4 5% 6% 30%	2323
	21st to end	Day	22% 14% 3 7% 4 4 4 4 5% 6% 28%	2470
May	1st to 10th	Day	25% 18% 4 8% 4 3 3 3 5% 6% 21%	4220
	11th to 20th	Day	21% 12% 3 8% 5% 4 4 3 5% 6% 30%	4398
	21st to end	Day	17% 10% 3 7% 5% 4 5% 4 7% 9% 29%	4836
June	1st to 10th	Day	26% 11% 3 7% 5% 4 4 4 6% 6% 24%	2660
	11th to 20th	Day	21% 10% 3 6% 5% 4 3 3 5% 7% 32%	2778
	21st to end	Day	25% 10% 4 8% 4 4 4 3 5% 7% 26%	2850
July	1st to 10th	Day	22% 8% 2 6% 4 5% 5% 4 6% 8% 30%	4669
	11th to 20th	Day	17% 8% 3 8% 5% 5% 6% 4 6% 8% 31%	4440
	21st to end	Day	15% 9% 3 8% 5% 5% 5% 5% 7% 8% 31%	4692
August	1st to 10th	Day	23% 10% 3 8% 5% 5% 5% 4 5% 7% 26%	4105
	11th to 20th	Day	15% 8% 3 8% 5% 6% 5% 4 7% 7% 32%	4045
	21st to end	Day	12% 5% 3 5% 4 4 5% 4 7% 8% 43%	4351
September	1st to 10th	Day	18% 6% 2 6% 5% 3 4 3 5% 7% 41%	2280
	11th to 20th	Day	19% 7% 3 6% 3 3 4 3 5% 6% 42%	2210
	21st to end	Day	19% 8% 2 5% 4 4 3 3 4 7% 41%	2028
October	1st to 10th	Day	18% 8% 2 6% 4 5% 4 3 5% 7% 37%	1900
	11th to 20th	Day	20% 10% 3 7% 4 4 5% 3 6% 7% 32%	1900
	21st to end	Day	20% 15% 4 8% 5% 3 4 4 4 4 29%	2090
November	1st to 10th	Day	22% 14% 3 7% 6% 5% 5% 4 3 5% 27%	1535
	11th to 20th	Day	19% 19% 6% 7% 5% 3 4 3 5% 5% 24%	1520
	21st to end	Day	18% 18% 5% 9% 7% 5% 5% 3 4 5% 21%	1520
December	1st to 10th	Day	23% 20% 7% 11% 6% 4 3 2 3 4 17%	1520
	11th to 20th	Day	28% 18% 6% 11% 8% 4 4 3 4 3 12%	1906
	21st to end	Day	23% 15% 11% 14% 6% 4 3 2 2 5% 15%	2783
January	1st to 10th	Night	15% 14% 7% 17% 8% 4 3 3 4 5% 19%	4429
	11th to 20th	Night	16% 17% 6% 20% 6% 6% 4 3 4 4 15%	4362
	21st to end	Night	17% 13% 7% 16% 8% 5% 4 3 4 5% 17%	4532
February	1st to 10th	Night	19% 15% 5% 14% 10% 5% 5% 3 4 4 16%	2470
	11th to 20th	Night	17% 15% 5% 12% 9% 6% 3 4 4 5% 18%	2403
	21st to end	Night	11% 16% 5% 12% 8% 5% 4 3 4 5% 26%	2017
March	1st to 10th	Night	23% 15% 4 12% 8% 5% 3 3 3 3 21%	3420
	11th to 20th	Night	17% 21% 8% 10% 5% 4 4 3 4 5% 19%	3479
	21st to end	Night	26% 17% 6% 11% 5% 3 2 2 2 3 23%	3816
April	1st to 10th	Night	22% 15% 4 8% 5% 4 4 3 4 4 27%	1906
	11th to 20th	Night	22% 12% 3 7% 5% 4 3 3 4 6% 32%	1803
	21st to end	Night	22% 13% 3 7% 5% 4 4 3 4 5% 30%	1710
May	1st to 10th	Night	23% 19% 3 7% 4 4 4 4 5% 5% 23%	2722
	11th to 20th	Night	20% 11% 2 6% 4 4 4 4 7% 7% 30%	2506
	21st to end	Night	17% 9% 4 9% 6% 5% 6% 3 5% 7% 29%	2749
June	1st to 10th	Night	25% 9% 3 6% 4 4 5% 3 6% 8% 27%	1520
	11th to 20th	Night	19% 9% 3 6% 5% 4 4 4 5% 7% 35%	1415
	21st to end	Night	22% 10% 3 8% 6% 4 5% 4 5% 7% 25%	1330
July	1st to 10th	Night	20% 10% 3 8% 6% 4 5% 4 7% 7% 26%	2264
	11th to 20th	Night	19% 8% 2 7% 3 4 5% 4 7% 9% 32%	2530
	21st to end	Night	14% 7% 3 7% 4 4 4 4 5% 8% 40%	2866
August	1st to 10th	Night	20% 8% 3 7% 4 4 5% 4 6% 7% 33%	2825
	11th to 20th	Night	15% 8% 3 8% 5% 5% 5% 4 5% 9% 34%	2782
	21st to end	Night	13% 5% 2 5% 3 3 4 3 5% 7% 50%	3304
September	1st to 10th	Night	14% 7% 3 5% 5% 4 4 3 4 7% 44%	1900
	11th to 20th	Night	17% 7% 3 5% 3 2 4 3 4 7% 43%	1966
	21st to end	Night	17% 9% 3 7% 4 4 4 3 5% 6% 39%	2152
October	1st to 10th	Night	19% 6% 3 6% 5% 4 4 4 5% 6% 39%	2280
	11th to 20th	Night	19% 9% 3 6% 4 4 4 2 5% 7% 36%	2280
	21st to end	Night	24% 11% 3 7% 4 4 4 3 4 6% 30%	2508
November	1st to 10th	Night	21% 13% 3 7% 6% 3 3 3 5% 6% 30%	2548
	11th to 20th	Night	19% 17% 5% 10% 6% 4 5% 3 4 5% 23%	2660
	21st to end	Night	19% 15% 6% 10% 6% 4 3 3 4 5% 23%	2660
December	1st to 10th	Night	23% 16% 5% 12% 7% 4 4 3 4 4 16%	2660
	11th to 20th	Night	27% 18% 5% 13% 6% 4 3 2 3 3 16%	3293
	21st to end	Night	25% 16% 7% 11% 5% 3 3 2 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% 6% 11% 16% 9% 2	1437
March	1st to 10th	Day	65% 4 8% 16% 6% 1	3423
	11th to 20th	Day	64% 7% 10% 13% 6% 1	3480
	21st to end	Day	71% 3 6% 12% 7% 1	3816
April	1st to 10th	Day	64% 4 6% 13% 10% 2	2273
	11th to 20th	Day	53% 6% 9% 19% 12% 1	2323
	21st to end	Day	57% 5% 10% 16% 11% 2	2470
May	1st to 10th	Day	63% 7% 9% 14% 6% 1	4234
	11th to 20th	Day	53% 9% 13% 19% 7%	4402
	21st to end	Day	48% 10% 17% 17% 9% 1	4836
June	1st to 10th	Day	59% 7% 11% 17% 5%	2660
	11th to 20th	Day	52% 6% 12% 19% 10% 1	2778
	21st to end	Day	58% 7% 10% 15% 9%	2850
July	1st to 10th	Day	53% 5% 12% 17% 12% 1	4596
	11th to 20th	Day	51% 6% 15% 21% 7%	4364
	21st to end	Day	48% 6% 17% 21% 7%	4542
August	1st to 10th	Day	59% 5% 12% 17% 7%	4092
	11th to 20th	Day	50% 5% 13% 24% 8%	4084
	21st to end	Day	38% 4 13% 29% 16% 1	4351
September	1st to 10th	Day	43% 5% 13% 24% 13% 2	2280
	11th to 20th	Day	43% 5% 12% 24% 14% 1	2210
	21st to end	Day	44% 5% 10% 25% 15%	2028
October	1st to 10th	Day	47% 5% 11% 26% 11%	1900
	11th to 20th	Day	50% 7% 12% 23% 8%	1900
	21st to end	Day	57% 6% 10% 18% 8%	2090
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% 16% 8% 1	2017
March	1st to 10th	Night	68% 5% 7% 14% 7% 1	3429
	11th to 20th	Night	65% 6% 10% 13% 6% 1	3480
	21st to end	Night	68% 3 7% 13% 7% 1	3816
April	1st to 10th	Night	60% 6% 9% 13% 10% 3	1906
	11th to 20th	Night	55% 4 9% 18% 13% 1	1803
	21st to end	Night	56% 5% 10% 15% 12% 2	1710
May	1st to 10th	Night	62% 7% 12% 13% 6% 1	2728
	11th to 20th	Night	50% 9% 13% 21% 7% 1	2507
	21st to end	Night	52% 9% 17% 17% 5% 1	2750
June	1st to 10th	Night	55% 8% 13% 18% 6%	1520
	11th to 20th	Night	49% 5% 14% 20% 11% 1	1415
	21st to end	Night	57% 8% 14% 14% 7% 1	1330
July	1st to 10th	Night	56% 7% 13% 15% 8% 1	2228
	11th to 20th	Night	48% 6% 19% 17% 9%	2482
	21st to end	Night	43% 6% 15% 22% 12% 1	2776
August	1st to 10th	Night	51% 7% 15% 23% 5%	2813
	11th to 20th	Night	48% 7% 14% 24% 7%	2809
	21st to end	Night	34% 4 18% 27% 15% 1	3303
September	1st to 10th	Night	39% 7% 13% 26% 14% 2	1900
	11th to 20th	Night	40% 6% 11% 29% 13% 1	1966
	21st to end	Night	45% 6% 11% 26% 13% 1	2152
October	1st to 10th	Night	46% 5% 11% 25% 12% 1	2280
	11th to 20th	Night	48% 5% 13% 26% 8%	2280
	21st to end	Night	55% 6% 11% 17% 11%	2508
November	1st to 10th	Night	54% 6% 13% 17% 9% 1	2548
	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	28% 24% 33% 12% 3 1	307
March	1st to 10th	Day	34% 25% 30% 8% 2	456
	11th to 20th	Day	29% 31% 25% 10% 4	460
	21st to end	Day	38% 28% 23% 8% 3	506
April	1st to 10th	Day	44% 23% 25% 7% 1	460
	11th to 20th	Day	34% 27% 26% 11% 2	452
	21st to end	Day	33% 23% 26% 13% 5%	460
May	1st to 10th	Day	40% 21% 25% 10% 3 1	525
	11th to 20th	Day	29% 19% 29% 18% 5% 1	674
	21st to end	Day	29% 18% 35% 15% 3 1	735
June	1st to 10th	Day	33% 18% 30% 14% 4	680
	11th to 20th	Day	28% 15% 33% 18% 5% 1	680
	21st to end	Day	34% 12% 31% 17% 6% 1	680
July	1st to 10th	Day	23% 10% 37% 21% 8% 1	670
	11th to 20th	Day	20% 10% 38% 22% 8% 1	668
	21st to end	Day	21% 10% 38% 23% 7% 1	666
August	1st to 10th	Day	18% 9% 38% 26% 7% 1	486
	11th to 20th	Day	22% 10% 35% 20% 10% 3	479
	21st to end	Day	17% 15% 34% 22% 9% 4	539
September	1st to 10th	Day	19% 14% 34% 23% 8% 1	490
	11th to 20th	Day	26% 15% 30% 19% 8% 3	490
	21st to end	Day	24% 16% 31% 19% 9% 2	457
October	1st to 10th	Day	23% 15% 33% 19% 9% 2	390
	11th to 20th	Day	28% 18% 30% 15% 6% 2	390
	21st to end	Day	31% 24% 27% 14% 4 1	429
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% 25% 31% 20% 4	628
March	1st to 10th	Night	28% 25% 31% 14% 2	760
	11th to 20th	Night	26% 20% 31% 19% 4	760
	21st to end	Night	30% 19% 32% 15% 4	836
April	1st to 10th	Night	32% 20% 28% 17% 3	576
	11th to 20th	Night	30% 21% 31% 15% 3	564
	21st to end	Night	29% 20% 30% 17% 4	570
May	1st to 10th	Night	31% 17% 31% 18% 3 1	570
	11th to 20th	Night	28% 13% 31% 23% 5%	562
	21st to end	Night	20% 17% 41% 20% 2	616
June	1st to 10th	Night	29% 15% 32% 22% 2	570
	11th to 20th	Night	23% 11% 36% 27% 3	465
	21st to end	Night	26% 6% 31% 31% 6%	380
July	1st to 10th	Night	20% 5% 37% 30% 8%	397
	11th to 20th	Night	18% 7% 37% 31% 7%	552
	21st to end	Night	18% 6% 33% 34% 8%	623
August	1st to 10th	Night	18% 6% 32% 35% 9% 1	568
	11th to 20th	Night	17% 8% 29% 34% 11% 1	562
	21st to end	Night	16% 8% 29% 34% 12%	627
September	1st to 10th	Night	16% 10% 33% 30% 10%	570
	11th to 20th	Night	21% 10% 27% 30% 12% 1	636
	21st to end	Night	24% 12% 30% 25% 9% 1	760
October	1st to 10th	Night	23% 11% 31% 26% 9% 1	760
	11th to 20th	Night	23% 16% 34% 19% 7% 1	760
	21st to end	Night	33% 18% 29% 17% 4	836
November	1st to 10th	Night	31% 15% 28% 19% 6% 1	826
	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 2024-10-29 12:20:50. Version ac07

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