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 2026-09-14.

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% 13% 4 9% 5% 5% 4 3 5% 6% 27%	150587
	Night	19% 13% 5% 11% 6% 4 4 3 4 5% 26%	140698
Transparency	Day	57% 4 11% 18% 9% 1	154166
	Night	60% 4 11% 17% 8% 1	145208
Seeing	Day	31% 19% 30% 15% 5% 1	19979
	Night	28% 17% 30% 20% 5%	27181

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	13% 24% 8% 15% 9% 6% 3 2 2 3 15%	4690
	11th to 20th	Day	17% 21% 10% 19% 6% 5% 4 2 3 3 9%	4832
	21st to end	Day	13% 12% 6% 14% 10% 9% 6% 3 4 4 19%	5781
February	1st to 10th	Day	17% 17% 6% 12% 9% 7% 4 4 4 4 17%	1890
	11th to 20th	Day	16% 17% 6% 15% 7% 5% 3 3 4 5% 20%	1843
	21st to end	Day	11% 16% 5% 10% 8% 5% 3 3 5% 5% 28%	1583
March	1st to 10th	Day	23% 16% 5% 12% 5% 5% 3 2 3 4 21%	5028
	11th to 20th	Day	13% 19% 6% 10% 4 4 3 3 5% 6% 26%	5090
	21st to end	Day	24% 20% 5% 10% 5% 4 3 3 3 4 20%	5587
April	1st to 10th	Day	23% 17% 5% 8% 6% 3 3 3 3 4 25%	2513
	11th to 20th	Day	21% 14% 3 7% 5% 4 3 4 5% 6% 30%	2571
	21st to end	Day	22% 14% 3 7% 4 4 4 4 5% 6% 28%	2730
May	1st to 10th	Day	29% 14% 3 7% 4 4 4 3 4 5% 22%	7849
	11th to 20th	Day	20% 11% 3 8% 5% 4 4 3 4 6% 31%	8220
	21st to end	Day	22% 13% 3 7% 4 4 4 3 5% 7% 28%	9059
June	1st to 10th	Day	24% 11% 3 7% 5% 4 5% 4 6% 6% 25%	2940
	11th to 20th	Day	20% 10% 3 7% 5% 5% 3 3 5% 8% 32%	3070
	21st to end	Day	25% 10% 4 8% 4 4 4 3 5% 7% 26%	3150
July	1st to 10th	Day	18% 8% 3 7% 5% 5% 5% 4 6% 9% 30%	8705
	11th to 20th	Day	14% 7% 3 8% 4 5% 5% 4 6% 8% 37%	8280
	21st to end	Day	14% 7% 2 6% 4 4 5% 4 6% 9% 38%	8760
August	1st to 10th	Day	19% 9% 3 8% 5% 5% 5% 3 5% 7% 32%	6015
	11th to 20th	Day	16% 8% 3 9% 5% 6% 5% 4 6% 7% 31%	5953
	21st to end	Day	13% 6% 3 6% 4 5% 5% 4 7% 9% 39%	6337
September	1st to 10th	Day	19% 6% 3 6% 4 3 4 3 5% 7% 40%	2520
	11th to 20th	Day	18% 7% 3 6% 3 3 4 3 5% 6% 43%	2362
	21st to end	Day	18% 8% 2 5% 3 4 3 3 4 7% 41%	2134
October	1st to 10th	Day	18% 8% 2 5% 4 5% 4 3 5% 7% 38%	2000
	11th to 20th	Day	19% 11% 3 7% 4 4 5% 3 6% 7% 31%	2000
	21st to end	Day	20% 14% 4 8% 5% 4 4 4 4 4 30%	2200
November	1st to 10th	Day	22% 15% 3 7% 6% 5% 4 4 3 5% 26%	1699
	11th to 20th	Day	20% 21% 6% 7% 4 3 4 3 5% 5% 22%	1680
	21st to end	Day	18% 19% 5% 9% 7% 6% 4 3 4 5% 20%	1680
December	1st to 10th	Day	17% 18% 10% 18% 5% 4 3 2 3 4 15%	2690
	11th to 20th	Day	24% 16% 5% 14% 7% 4 4 3 3 2 17%	3076
	21st to end	Day	19% 14% 9% 16% 7% 4 4 3 3 4 17%	4070
January	1st to 10th	Night	14% 18% 8% 17% 9% 6% 3 3 3 4 14%	8234
	11th to 20th	Night	19% 18% 8% 19% 5% 5% 4 3 3 3 13%	8072
	21st to end	Night	11% 12% 5% 19% 14% 8% 5% 3 4 4 15%	8400
February	1st to 10th	Night	18% 15% 6% 16% 10% 5% 4 3 4 4 16%	2730
	11th to 20th	Night	16% 15% 5% 12% 9% 6% 4 4 4 5% 20%	2663
	21st to end	Night	12% 16% 5% 12% 8% 5% 4 3 4 5% 26%	2222
March	1st to 10th	Night	23% 15% 5% 12% 8% 5% 3 3 3 4 20%	5031
	11th to 20th	Night	17% 17% 6% 8% 4 4 4 4 4 5% 26%	5089
	21st to end	Night	25% 18% 5% 10% 4 3 3 2 3 3 23%	5587
April	1st to 10th	Night	23% 16% 4 7% 5% 4 4 3 4 4 26%	2106
	11th to 20th	Night	23% 13% 3 7% 5% 4 3 3 4 5% 30%	1995
	21st to end	Night	22% 13% 3 7% 4 4 4 3 4 5% 30%	1890
May	1st to 10th	Night	27% 17% 3 8% 4 4 4 3 4 4 21%	5058
	11th to 20th	Night	22% 12% 3 7% 4 5% 5% 4 6% 6% 27%	4670
	21st to end	Night	19% 14% 3 8% 5% 4 5% 3 5% 6% 30%	5147
June	1st to 10th	Night	24% 9% 3 6% 4 4 4 3 6% 8% 29%	1680
	11th to 20th	Night	19% 9% 3 7% 5% 4 4 4 5% 7% 35%	1563
	21st to end	Night	22% 10% 3 8% 5% 4 4 4 6% 7% 25%	1470
July	1st to 10th	Night	15% 9% 3 9% 5% 6% 6% 4 7% 8% 27%	4206
	11th to 20th	Night	15% 8% 2 7% 4 4 5% 3 6% 8% 39%	4710
	21st to end	Night	14% 7% 2 7% 4 4 5% 4 6% 8% 39%	5336
August	1st to 10th	Night	19% 7% 3 6% 4 4 4 4 6% 7% 36%	4135
	11th to 20th	Night	15% 8% 3 9% 5% 5% 4 4 5% 8% 34%	4092
	21st to end	Night	17% 7% 2 6% 3 3 4 3 4 7% 44%	4787
September	1st to 10th	Night	15% 7% 2 5% 5% 4 4 3 4 7% 44%	2100
	11th to 20th	Night	17% 7% 3 5% 3 3 4 3 4 7% 44%	2101
	21st to end	Night	17% 9% 3 6% 4 3 4 3 5% 6% 40%	2265
October	1st to 10th	Night	18% 6% 2 6% 5% 4 4 4 5% 6% 40%	2400
	11th to 20th	Night	20% 10% 3 6% 4 4 4 2 5% 6% 35%	2400
	21st to end	Night	24% 11% 3 7% 4 4 4 3 4 6% 30%	2640
November	1st to 10th	Night	21% 14% 3 7% 5% 3 4 3 5% 5% 30%	2816
	11th to 20th	Night	19% 19% 5% 10% 5% 4 4 3 4 4 21%	2940
	21st to end	Night	20% 16% 6% 10% 6% 4 3 3 4 5% 22%	2940
December	1st to 10th	Night	16% 15% 9% 17% 6% 4 4 3 4 4 18%	4720
	11th to 20th	Night	21% 16% 4 14% 6% 4 3 2 3 3 22%	5353
	21st to end	Night	21% 16% 7% 12% 6% 3 3 2 3 3 24%	7150

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	75% 3 11% 8% 3	4691
	11th to 20th	Day	79% 5% 6% 8% 2	4861
	21st to end	Day	66% 4 7% 12% 9% 2	5781
February	1st to 10th	Day	70% 5% 8% 9% 6% 1	1890
	11th to 20th	Day	67% 6% 8% 13% 6%	1851
	21st to end	Day	57% 5% 11% 16% 10% 2	1583
March	1st to 10th	Day	68% 3 7% 13% 7% 2	5032
	11th to 20th	Day	58% 5% 14% 17% 6% 1	5090
	21st to end	Day	70% 3 4 14% 8% 1	5587
April	1st to 10th	Day	64% 4 6% 12% 11% 2	2513
	11th to 20th	Day	55% 6% 8% 18% 12% 1	2571
	21st to end	Day	57% 5% 9% 17% 11% 2	2730
May	1st to 10th	Day	63% 4 10% 15% 7% 1	7861
	11th to 20th	Day	55% 5% 11% 21% 8%	8224
	21st to end	Day	56% 6% 11% 15% 12%	9060
June	1st to 10th	Day	58% 6% 11% 18% 6% 1	2940
	11th to 20th	Day	52% 5% 13% 19% 10% 1	3070
	21st to end	Day	58% 7% 10% 15% 9% 1	3150
July	1st to 10th	Day	52% 3 14% 19% 11% 1	8632
	11th to 20th	Day	46% 3 14% 27% 10%	8204
	21st to end	Day	44% 4 15% 27% 10%	8566
August	1st to 10th	Day	54% 4 13% 19% 8% 1	6002
	11th to 20th	Day	53% 4 15% 23% 6%	5992
	21st to end	Day	42% 4 13% 29% 12% 1	6337
September	1st to 10th	Day	44% 5% 12% 24% 13% 1	2520
	11th to 20th	Day	43% 5% 12% 24% 15% 1	2362
	21st to end	Day	43% 5% 10% 25% 17%	2134
October	1st to 10th	Day	50% 3 10% 25% 12%	3260
	11th to 20th	Day	48% 5% 8% 25% 14%	3240
	21st to end	Day	49% 4 14% 22% 11%	3538
November	1st to 10th	Day	60% 6% 8% 18% 7%	1699
	11th to 20th	Day	64% 6% 11% 13% 5% 1	1680
	21st to end	Day	65% 8% 12% 11% 4	1680
December	1st to 10th	Day	74% 3 6% 14% 2	2690
	11th to 20th	Day	73% 3 6% 11% 5%	3075
	21st to end	Day	71% 4 8% 11% 5%	4070
January	1st to 10th	Night	74% 5% 8% 12% 2	8234
	11th to 20th	Night	76% 4 7% 10% 3	8118
	21st to end	Night	71% 4 7% 12% 5% 1	8400
February	1st to 10th	Night	71% 5% 8% 10% 6% 1	2730
	11th to 20th	Night	66% 5% 12% 12% 5% 1	2666
	21st to end	Night	60% 5% 10% 17% 8% 1	2222
March	1st to 10th	Night	70% 3 5% 11% 9% 1	5040
	11th to 20th	Night	59% 4 12% 17% 7% 1	5090
	21st to end	Night	68% 3 5% 15% 8% 1	5587
April	1st to 10th	Night	61% 5% 8% 12% 11% 3	2106
	11th to 20th	Night	56% 4 8% 18% 13% 1	1995
	21st to end	Night	56% 4 10% 16% 11% 2	1890
May	1st to 10th	Night	67% 4 9% 14% 6%	5064
	11th to 20th	Night	56% 5% 10% 20% 7% 1	4671
	21st to end	Night	57% 5% 12% 17% 9% 1	5148
June	1st to 10th	Night	54% 7% 12% 20% 7% 1	1680
	11th to 20th	Night	49% 4 13% 21% 11% 1	1563
	21st to end	Night	57% 7% 14% 14% 7% 1	1470
July	1st to 10th	Night	55% 5% 13% 18% 8% 1	4170
	11th to 20th	Night	44% 4 14% 26% 12% 1	4662
	21st to end	Night	45% 4 13% 25% 13%	5216
August	1st to 10th	Night	48% 5% 18% 20% 7% 2	4123
	11th to 20th	Night	50% 5% 19% 21% 6%	4119
	21st to end	Night	42% 3 17% 25% 12% 1	4786
September	1st to 10th	Night	40% 6% 13% 26% 14% 1	2100
	11th to 20th	Night	39% 6% 11% 30% 13% 1	2101
	21st to end	Night	44% 5% 10% 27% 12% 1	2265
October	1st to 10th	Night	50% 3 10% 25% 11%	3920
	11th to 20th	Night	46% 3 11% 24% 15%	3899
	21st to end	Night	47% 4 12% 22% 14%	4252
November	1st to 10th	Night	55% 6% 12% 17% 9% 1	2816
	11th to 20th	Night	64% 5% 11% 14% 6%	2940
	21st to end	Night	64% 5% 15% 13% 3	2940
December	1st to 10th	Night	69% 3 9% 17% 2	4720
	11th to 20th	Night	68% 3 7% 15% 6% 1	5355
	21st to end	Night	65% 4 9% 16% 5%	7150

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	35% 23% 30% 12% 1	430
	11th to 20th	Day	38% 20% 28% 10% 4	430
	21st to end	Day	28% 26% 33% 11% 2	473
February	1st to 10th	Day	32% 24% 28% 13% 2	430
	11th to 20th	Day	38% 25% 26% 9% 2	426
	21st to end	Day	30% 23% 32% 12% 2 1	355
March	1st to 10th	Day	35% 25% 31% 7% 2	535
	11th to 20th	Day	31% 31% 25% 9% 4	540
	21st to end	Day	39% 29% 22% 7% 3	594
April	1st to 10th	Day	45% 24% 24% 6% 1	540
	11th to 20th	Day	37% 26% 24% 10% 2	532
	21st to end	Day	34% 24% 26% 12% 4	540
May	1st to 10th	Day	41% 21% 25% 9% 3	612
	11th to 20th	Day	31% 18% 29% 17% 4 1	774
	21st to end	Day	32% 18% 33% 15% 2 1	845
June	1st to 10th	Day	32% 18% 30% 15% 4	780
	11th to 20th	Day	28% 16% 33% 18% 4 1	780
	21st to end	Day	34% 12% 31% 17% 5% 1	780
July	1st to 10th	Day	23% 10% 38% 22% 7% 1	770
	11th to 20th	Day	20% 12% 36% 23% 8% 1	768
	21st to end	Day	21% 10% 38% 23% 7% 1	768
August	1st to 10th	Day	17% 9% 39% 26% 7% 1	566
	11th to 20th	Day	21% 10% 36% 20% 9% 3	559
	21st to end	Day	17% 15% 36% 19% 9% 3	627
September	1st to 10th	Day	21% 14% 33% 23% 7% 1	570
	11th to 20th	Day	26% 15% 30% 18% 8% 3	542
	21st to end	Day	23% 16% 32% 19% 8% 2	493
October	1st to 10th	Day	23% 15% 33% 19% 9% 2	420
	11th to 20th	Day	29% 18% 31% 14% 6% 2	420
	21st to end	Day	30% 23% 27% 14% 4 1	462
November	1st to 10th	Day	34% 19% 28% 13% 5% 1	425
	11th to 20th	Day	41% 20% 24% 10% 5%	430
	21st to end	Day	36% 24% 27% 10% 3 1	430
December	1st to 10th	Day	40% 19% 28% 11% 2	430
	11th to 20th	Day	45% 21% 23% 9% 1	430
	21st to end	Day	37% 23% 28% 10% 3 1	473
January	1st to 10th	Night	32% 22% 31% 14% 2	950
	11th to 20th	Night	32% 23% 28% 14% 2	920
	21st to end	Night	26% 26% 30% 16% 2	924
February	1st to 10th	Night	30% 22% 30% 16% 2	840
	11th to 20th	Night	34% 25% 27% 13% 1	823
	21st to end	Night	23% 24% 31% 19% 3	692
March	1st to 10th	Night	29% 24% 31% 14% 2	840
	11th to 20th	Night	26% 20% 31% 18% 4	840
	21st to end	Night	31% 19% 31% 15% 4	924
April	1st to 10th	Night	34% 20% 28% 16% 2	636
	11th to 20th	Night	32% 21% 30% 15% 3	624
	21st to end	Night	29% 20% 29% 18% 4	630
May	1st to 10th	Night	33% 16% 31% 16% 3	630
	11th to 20th	Night	29% 13% 31% 23% 4	622
	21st to end	Night	22% 17% 40% 19% 2	682
June	1st to 10th	Night	28% 14% 33% 22% 3	630
	11th to 20th	Night	23% 11% 36% 26% 3	513
	21st to end	Night	25% 6% 31% 32% 6%	420
July	1st to 10th	Night	19% 5% 37% 31% 8%	440
	11th to 20th	Night	17% 7% 37% 31% 7%	612
	21st to end	Night	19% 6% 32% 34% 8%	689
August	1st to 10th	Night	18% 6% 30% 36% 10% 1	628
	11th to 20th	Night	17% 8% 29% 35% 12% 1	622
	21st to end	Night	17% 8% 30% 33% 12%	693
September	1st to 10th	Night	17% 10% 33% 30% 10%	630
	11th to 20th	Night	21% 11% 26% 30% 12% 1	680
	21st to end	Night	24% 12% 30% 25% 9% 1	800
October	1st to 10th	Night	22% 12% 30% 26% 9% 1	800
	11th to 20th	Night	25% 16% 33% 19% 7% 1	800
	21st to end	Night	33% 17% 29% 17% 4	880
November	1st to 10th	Night	33% 15% 29% 18% 5% 1	922
	11th to 20th	Night	34% 19% 26% 17% 4	950
	21st to end	Night	33% 22% 26% 16% 3 1	950
December	1st to 10th	Night	34% 19% 29% 15% 3	950
	11th to 20th	Night	34% 26% 27% 11% 2	950
	21st to end	Night	33% 21% 28% 16% 2	1045

Page generated at 2026-09-11 05:11:57. Version ac07

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