Lakeland Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lakeland Provincial Park clear sky chart from 2005-11-06 to 2025-01-07.

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	10% 9% 4 9% 6% 5% 5% 4 6% 8% 33%	108595
	Night	8% 10% 4 10% 7% 6% 6% 4 6% 8% 31%	108960
Transparency	Day	47% 7% 18% 21% 6%	108336
	Night	48% 7% 17% 21% 7% 1	108865
Seeing	Day	14% 10% 29% 28% 15% 4	15916
	Night	13% 7% 29% 34% 15% 2	24846

By Month

Percentage Cloud Cover NW (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	4 14% 8% 18% 12% 5% 5% 4 5% 5% 20%	2261
	11th to 20th	Day	5% 8% 3 10% 8% 7% 9% 9% 9% 8% 23%	2199
	21st to end	Day	6% 10% 6% 13% 11% 6% 5% 4 6% 6% 28%	2442
February	1st to 10th	Day	6% 14% 4 13% 8% 7% 6% 5% 7% 7% 23%	1510
	11th to 20th	Day	6% 11% 4 10% 9% 7% 7% 4 8% 8% 25%	1653
	21st to end	Day	4 11% 5% 12% 9% 8% 7% 4 7% 8% 23%	1413
March	1st to 10th	Day	4 11% 4 8% 7% 6% 9% 6% 8% 9% 28%	3130
	11th to 20th	Day	5% 8% 4 9% 6% 6% 5% 4 8% 11% 34%	3489
	21st to end	Day	10% 13% 5% 13% 6% 4 4 4 5% 7% 28%	3825
April	1st to 10th	Day	8% 13% 4 9% 8% 6% 5% 4 6% 8% 30%	2406
	11th to 20th	Day	12% 13% 4 9% 6% 5% 4 4 6% 6% 30%	2440
	21st to end	Day	13% 11% 4 9% 6% 5% 5% 4 7% 7% 29%	2536
May	1st to 10th	Day	15% 9% 3 9% 6% 5% 6% 4 6% 8% 28%	4633
	11th to 20th	Day	16% 11% 3 8% 5% 5% 5% 4 6% 6% 31%	4694
	21st to end	Day	12% 8% 3 9% 6% 6% 6% 5% 7% 9% 29%	5161
June	1st to 10th	Day	16% 8% 3 7% 6% 5% 6% 5% 7% 7% 30%	2980
	11th to 20th	Day	19% 10% 3 8% 6% 5% 5% 5% 6% 7% 26%	3059
	21st to end	Day	12% 7% 3 8% 5% 6% 6% 5% 6% 9% 33%	3225
July	1st to 10th	Day	8% 6% 3 6% 4 4 5% 5% 7% 8% 45%	4749
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 4 6% 10% 46%	4740
	21st to end	Day	15% 6% 2 6% 4 4 5% 5% 6% 8% 40%	5138
August	1st to 10th	Day	12% 7% 2 6% 4 4 5% 4 5% 6% 45%	4720
	11th to 20th	Day	8% 7% 2 6% 5% 4 5% 5% 7% 9% 42%	4104
	21st to end	Day	10% 5% 2 5% 4 4 5% 4 7% 9% 44%	4521
September	1st to 10th	Day	12% 7% 2 7% 5% 4 5% 4 6% 7% 40%	2408
	11th to 20th	Day	15% 9% 2 7% 4 5% 5% 4 6% 7% 38%	2142
	21st to end	Day	10% 7% 2 7% 5% 4 4 5% 6% 9% 41%	2090
October	1st to 10th	Day	9% 12% 4 8% 5% 4 5% 4 7% 8% 34%	3180
	11th to 20th	Day	12% 11% 4 7% 5% 5% 5% 4 6% 8% 33%	2980
	21st to end	Day	8% 14% 6% 11% 5% 5% 4 4 6% 7% 28%	2891
November	1st to 10th	Day	10% 16% 6% 10% 8% 5% 6% 5% 4 6% 23%	1568
	11th to 20th	Day	8% 13% 5% 13% 9% 7% 5% 4 7% 7% 23%	1474
	21st to end	Day	5% 13% 6% 15% 8% 6% 5% 4 6% 6% 27%	1395
December	1st to 10th	Day	5% 13% 6% 15% 7% 8% 6% 5% 6% 8% 20%	1960
	11th to 20th	Day	8% 16% 7% 13% 8% 5% 5% 4 5% 6% 23%	2259
	21st to end	Day	2 9% 5% 14% 7% 7% 5% 4 7% 7% 33%	3220
January	1st to 10th	Night	4 12% 6% 18% 11% 7% 6% 5% 6% 6% 19%	4817
	11th to 20th	Night	3 10% 4 10% 7% 8% 10% 6% 6% 9% 26%	4699
	21st to end	Night	6% 10% 5% 13% 8% 5% 6% 4 6% 7% 29%	5214
February	1st to 10th	Night	6% 11% 4 13% 8% 7% 7% 5% 6% 8% 26%	2688
	11th to 20th	Night	5% 11% 5% 12% 7% 7% 5% 6% 6% 7% 30%	2414
	21st to end	Night	3 9% 4 10% 7% 8% 8% 6% 8% 9% 29%	2041
March	1st to 10th	Night	4 11% 5% 11% 6% 6% 6% 6% 9% 10% 25%	3739
	11th to 20th	Night	5% 9% 3 7% 6% 6% 7% 5% 7% 10% 36%	3490
	21st to end	Night	9% 12% 4 13% 7% 5% 5% 5% 6% 7% 27%	3828
April	1st to 10th	Night	8% 11% 4 7% 5% 5% 6% 5% 7% 9% 35%	1771
	11th to 20th	Night	8% 10% 4 10% 6% 7% 6% 4 7% 6% 30%	1691
	21st to end	Night	12% 12% 3 8% 5% 4 4 4 7% 7% 33%	1644
May	1st to 10th	Night	16% 9% 3 8% 6% 5% 5% 4 6% 8% 31%	2330
	11th to 20th	Night	15% 11% 3 7% 5% 4 4 3 6% 6% 35%	2199
	21st to end	Night	12% 9% 4 9% 6% 5% 5% 4 7% 8% 30%	2414
June	1st to 10th	Night	17% 8% 2 6% 5% 5% 8% 5% 6% 7% 31%	1197
	11th to 20th	Night	16% 12% 3 7% 6% 6% 6% 4 5% 7% 28%	1112
	21st to end	Night	10% 5% 2 7% 8% 5% 5% 4 7% 7% 39%	950
July	1st to 10th	Night	7% 5% 2 6% 3 4 6% 4 8% 10% 45%	2205
	11th to 20th	Night	6% 5% 2 6% 4 4 5% 5% 8% 9% 48%	2220
	21st to end	Night	16% 5% 2 5% 3 3 4 4 6% 8% 46%	2414
August	1st to 10th	Night	10% 5% 2 7% 6% 4 5% 4 5% 7% 44%	2210
	11th to 20th	Night	9% 6% 2 7% 5% 5% 5% 5% 7% 10% 39%	2730
	21st to end	Night	10% 6% 1 6% 4 4 4 3 7% 9% 46%	3146
September	1st to 10th	Night	12% 7% 1 6% 3 4 5% 4 6% 8% 44%	1772
	11th to 20th	Night	13% 6% 2 7% 4 4 4 4 6% 7% 43%	2035
	21st to end	Night	10% 5% 2 6% 5% 4 4 4 7% 8% 45%	2090
October	1st to 10th	Night	8% 8% 3 7% 5% 5% 6% 4 7% 9% 38%	3790
	11th to 20th	Night	10% 9% 3 8% 5% 4 5% 4 7% 8% 38%	3945
	21st to end	Night	10% 10% 6% 11% 6% 5% 6% 5% 7% 7% 27%	4636
November	1st to 10th	Night	12% 16% 5% 12% 7% 5% 4 4 5% 6% 25%	2730
	11th to 20th	Night	8% 13% 6% 13% 8% 7% 6% 4 6% 6% 22%	2925
	21st to end	Night	6% 14% 5% 13% 8% 6% 5% 4 6% 7% 26%	3002
December	1st to 10th	Night	8% 15% 5% 15% 7% 6% 5% 5% 7% 6% 21%	5220
	11th to 20th	Night	6% 16% 6% 15% 10% 7% 6% 4 5% 6% 18%	5933
	21st to end	Night	2 9% 4 12% 9% 6% 5% 4 5% 7% 35%	7719

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	63% 7% 11% 15% 4	2261
	11th to 20th	Day	52% 8% 15% 17% 7% 1	2220
	21st to end	Day	55% 8% 18% 13% 7%	2442
February	1st to 10th	Day	57% 7% 14% 14% 7%	1510
	11th to 20th	Day	53% 7% 16% 17% 7%	1662
	21st to end	Day	55% 8% 14% 16% 6%	1413
March	1st to 10th	Day	47% 9% 22% 19% 4	3130
	11th to 20th	Day	42% 8% 24% 21% 6%	3490
	21st to end	Day	53% 8% 13% 19% 7%	3825
April	1st to 10th	Day	50% 8% 15% 17% 9%	2406
	11th to 20th	Day	53% 6% 12% 19% 9% 1	2440
	21st to end	Day	50% 8% 13% 20% 8% 1	2536
May	1st to 10th	Day	52% 7% 13% 21% 8%	4633
	11th to 20th	Day	49% 8% 10% 21% 10% 1	4698
	21st to end	Day	45% 12% 18% 18% 7%	5162
June	1st to 10th	Day	49% 8% 15% 20% 8%	2980
	11th to 20th	Day	55% 9% 13% 18% 5%	3059
	21st to end	Day	44% 10% 18% 21% 6%	3225
July	1st to 10th	Day	35% 7% 24% 27% 7%	4675
	11th to 20th	Day	33% 6% 19% 28% 13%	4659
	21st to end	Day	40% 7% 23% 25% 5%	4976
August	1st to 10th	Day	39% 7% 21% 32% 1	4702
	11th to 20th	Day	37% 7% 26% 24% 6%	4144
	21st to end	Day	35% 6% 31% 26% 2	4520
September	1st to 10th	Day	40% 9% 19% 25% 6% 1	2408
	11th to 20th	Day	45% 6% 20% 25% 5%	2142
	21st to end	Day	38% 8% 20% 24% 9% 1	2090
October	1st to 10th	Day	47% 4 22% 24% 3	3180
	11th to 20th	Day	48% 5% 16% 26% 5%	2980
	21st to end	Day	53% 6% 20% 17% 2	2891
November	1st to 10th	Day	60% 7% 13% 16% 3	1568
	11th to 20th	Day	58% 7% 17% 15% 3	1474
	21st to end	Day	55% 9% 16% 15% 4	1395
December	1st to 10th	Day	60% 8% 12% 15% 4	1960
	11th to 20th	Day	62% 5% 16% 15% 3	2260
	21st to end	Day	49% 5% 14% 25% 6% 1	3220
January	1st to 10th	Night	62% 8% 12% 12% 5% 1	4817
	11th to 20th	Night	52% 7% 14% 20% 6% 1	4740
	21st to end	Night	52% 7% 20% 15% 5%	5214
February	1st to 10th	Night	53% 7% 12% 19% 8%	2688
	11th to 20th	Night	50% 7% 14% 20% 10%	2415
	21st to end	Night	45% 9% 17% 19% 9% 1	2041
March	1st to 10th	Night	48% 8% 19% 20% 5%	3739
	11th to 20th	Night	39% 10% 21% 23% 6%	3490
	21st to end	Night	51% 10% 13% 20% 7%	3828
April	1st to 10th	Night	43% 7% 15% 23% 11% 1	1771
	11th to 20th	Night	49% 8% 11% 17% 11% 3	1691
	21st to end	Night	48% 6% 12% 21% 11% 2	1644
May	1st to 10th	Night	47% 7% 12% 24% 10% 1	2330
	11th to 20th	Night	45% 8% 12% 23% 12% 1	2199
	21st to end	Night	47% 10% 18% 18% 7% 1	2414
June	1st to 10th	Night	48% 9% 14% 18% 10% 1	1197
	11th to 20th	Night	53% 10% 13% 18% 6% 1	1112
	21st to end	Night	39% 13% 17% 23% 7% 1	950
July	1st to 10th	Night	32% 8% 25% 26% 8% 1	2170
	11th to 20th	Night	29% 8% 17% 36% 8% 1	2178
	21st to end	Night	36% 7% 25% 27% 6%	2337
August	1st to 10th	Night	38% 6% 19% 34% 1	2203
	11th to 20th	Night	39% 7% 25% 22% 6%	2756
	21st to end	Night	35% 5% 27% 31% 3	3146
September	1st to 10th	Night	37% 8% 20% 26% 6% 3	1772
	11th to 20th	Night	38% 6% 20% 26% 9%	2035
	21st to end	Night	35% 6% 17% 29% 11% 2	2090
October	1st to 10th	Night	41% 5% 21% 25% 7%	3790
	11th to 20th	Night	42% 5% 18% 30% 5%	3945
	21st to end	Night	53% 5% 19% 19% 4	4636
November	1st to 10th	Night	59% 6% 12% 19% 5%	2730
	11th to 20th	Night	59% 8% 16% 13% 4	2925
	21st to end	Night	55% 8% 16% 17% 4	3002
December	1st to 10th	Night	62% 7% 14% 13% 5% 1	5220
	11th to 20th	Night	65% 6% 15% 11% 3	5931
	21st to end	Night	48% 5% 13% 22% 11% 1	7719

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	5% 11% 27% 37% 18% 3	192
	11th to 20th	Day	15% 9% 26% 34% 12% 3	180
	21st to end	Day	11% 10% 35% 30% 10% 5%	198
February	1st to 10th	Day	11% 16% 32% 32% 9% 1	180
	11th to 20th	Day	11% 11% 31% 29% 16% 3	265
	21st to end	Day	6% 16% 31% 29% 12% 7%	225
March	1st to 10th	Day	10% 13% 38% 29% 9% 1	417
	11th to 20th	Day	9% 13% 41% 26% 8% 3	460
	21st to end	Day	15% 12% 34% 28% 9% 1	506
April	1st to 10th	Day	13% 14% 36% 26% 7% 3	460
	11th to 20th	Day	17% 12% 31% 24% 12% 4	452
	21st to end	Day	17% 14% 31% 26% 10% 2	526
May	1st to 10th	Day	14% 14% 24% 28% 16% 5%	653
	11th to 20th	Day	13% 9% 25% 29% 17% 6%	675
	21st to end	Day	18% 5% 25% 27% 21% 4	734
June	1st to 10th	Day	20% 11% 28% 28% 11% 3	680
	11th to 20th	Day	21% 8% 25% 23% 17% 6%	699
	21st to end	Day	13% 6% 21% 32% 21% 7%	865
July	1st to 10th	Day	13% 6% 22% 34% 21% 5%	671
	11th to 20th	Day	12% 7% 23% 32% 21% 6%	668
	21st to end	Day	11% 6% 26% 29% 21% 8%	739
August	1st to 10th	Day	14% 6% 19% 29% 24% 8%	676
	11th to 20th	Day	11% 9% 27% 33% 17% 4	490
	21st to end	Day	13% 8% 27% 29% 19% 5%	539
September	1st to 10th	Day	16% 13% 29% 26% 14% 3	490
	11th to 20th	Day	20% 8% 28% 28% 14% 2	490
	21st to end	Day	14% 14% 32% 25% 13% 2	490
October	1st to 10th	Day	15% 12% 30% 26% 14% 3	310
	11th to 20th	Day	19% 11% 38% 23% 8% 1	300
	21st to end	Day	21% 14% 32% 21% 11% 2	330
November	1st to 10th	Day	21% 9% 33% 25% 10% 2	300
	11th to 20th	Day	13% 13% 48% 17% 7% 2	236
	21st to end	Day	11% 12% 41% 24% 8% 5%	200
December	1st to 10th	Day	9% 10% 37% 29% 12% 4	200
	11th to 20th	Day	10% 14% 38% 29% 10%	200
	21st to end	Day	9% 7% 28% 34% 18% 5%	220
January	1st to 10th	Night	11% 8% 32% 35% 12% 2	981
	11th to 20th	Night	10% 9% 33% 37% 9% 2	950
	21st to end	Night	14% 11% 34% 30% 9% 2	1045
February	1st to 10th	Night	12% 7% 28% 37% 15% 2	788
	11th to 20th	Night	12% 5% 34% 33% 15% 1	744
	21st to end	Night	7% 5% 27% 38% 20% 3	628
March	1st to 10th	Night	8% 8% 32% 37% 14% 1	760
	11th to 20th	Night	12% 6% 37% 31% 12% 2	760
	21st to end	Night	12% 9% 28% 36% 13% 2	836
April	1st to 10th	Night	11% 8% 32% 34% 14% 2	593
	11th to 20th	Night	14% 7% 31% 31% 16% 2	563
	21st to end	Night	16% 8% 28% 32% 14% 1	570
May	1st to 10th	Night	12% 8% 24% 35% 18% 3	451
	11th to 20th	Night	12% 7% 24% 38% 16% 4	374
	21st to end	Night	18% 4 20% 35% 21% 2	411
June	1st to 10th	Night	19% 7% 21% 36% 16% 1	380
	11th to 20th	Night	21% 6% 21% 29% 21% 2	380
	21st to end	Night	12% 4 21% 35% 25% 4	380
July	1st to 10th	Night	12% 3 18% 38% 28% 1	370
	11th to 20th	Night	9% 5% 17% 41% 25% 2	368
	21st to end	Night	11% 4 18% 39% 24% 5%	416
August	1st to 10th	Night	11% 2 15% 36% 29% 6%	378
	11th to 20th	Night	11% 5% 21% 39% 24% 2	523
	21st to end	Night	12% 4 22% 38% 22% 2	627
September	1st to 10th	Night	16% 6% 22% 32% 22% 2	570
	11th to 20th	Night	16% 5% 20% 40% 18% 1	705
	21st to end	Night	13% 7% 28% 37% 14% 1	760
October	1st to 10th	Night	15% 6% 31% 35% 11% 2	760
	11th to 20th	Night	14% 5% 33% 34% 11% 3	760
	21st to end	Night	17% 11% 33% 29% 9% 1	940
November	1st to 10th	Night	19% 7% 31% 33% 9% 2	975
	11th to 20th	Night	14% 9% 35% 29% 11% 3	1000
	21st to end	Night	10% 10% 38% 30% 11% 1	1000
December	1st to 10th	Night	13% 9% 32% 31% 13% 2	1000
	11th to 20th	Night	13% 10% 32% 33% 10% 2	1000
	21st to end	Night	8% 5% 32% 36% 16% 3	1100

Page generated at 2025-01-04 01:24:02. Version ac07

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