Tiny Marsh Provincial Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tiny Marsh Provincial Wildlife Area clear sky chart from 2005-11-06 to 2024-11-04.

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	15% 11% 4 8% 5% 5% 5% 3 5% 7% 33%	101943
	Night	15% 13% 5% 10% 6% 5% 4 3 5% 6% 28%	97017
Transparency	Day	49% 8% 13% 19% 10% 1	105527
	Night	53% 8% 12% 17% 9% 1	101522
Seeing	Day	20% 15% 29% 22% 10% 4	14959
	Night	21% 13% 29% 26% 10% 1	23874

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	15% 21% 8% 14% 7% 5% 4 4 4 5% 14%	2310
	11th to 20th	Day	10% 17% 7% 19% 9% 7% 6% 3 5% 5% 11%	2726
	21st to end	Day	16% 21% 8% 15% 7% 5% 6% 2 4 5% 11%	3124
February	1st to 10th	Day	12% 17% 7% 14% 10% 7% 5% 4 4 4 16%	1710
	11th to 20th	Day	13% 13% 6% 16% 7% 6% 6% 3 5% 6% 20%	1663
	21st to end	Day	14% 17% 7% 12% 6% 5% 6% 3 4 6% 20%	1464
March	1st to 10th	Day	18% 12% 5% 9% 6% 5% 4 3 4 5% 29%	3418
	11th to 20th	Day	11% 17% 6% 10% 6% 5% 5% 4 4 6% 26%	3480
	21st to end	Day	15% 10% 4 10% 5% 4 5% 3 4 5% 35%	3815
April	1st to 10th	Day	19% 13% 4 8% 5% 4 4 3 5% 5% 31%	2230
	11th to 20th	Day	20% 10% 2 5% 4 4 4 4 5% 5% 38%	2375
	21st to end	Day	21% 10% 3 6% 4 4 4 3 4 6% 36%	2470
May	1st to 10th	Day	17% 9% 3 7% 4 4 4 3 5% 7% 37%	4108
	11th to 20th	Day	14% 7% 3 7% 5% 4 5% 4 6% 8% 37%	4385
	21st to end	Day	14% 6% 2 4 4 4 4 3 5% 8% 45%	4837
June	1st to 10th	Day	17% 7% 2 5% 4 4 5% 4 6% 7% 38%	2660
	11th to 20th	Day	11% 6% 2 5% 5% 4 4 5% 7% 9% 42%	2845
	21st to end	Day	16% 6% 2 5% 4 4 4 4 6% 8% 41%	2850
July	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 5% 7% 9% 39%	4760
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 6% 7% 48%	4518
	21st to end	Day	9% 6% 2 6% 5% 4 4 4 6% 8% 47%	4530
August	1st to 10th	Day	13% 7% 3 7% 4 5% 4 4 6% 8% 40%	4104
	11th to 20th	Day	12% 7% 3 6% 4 4 4 4 7% 9% 39%	4044
	21st to end	Day	9% 5% 2 6% 4 5% 5% 4 7% 9% 45%	4414
September	1st to 10th	Day	14% 7% 3 7% 4 5% 4 3 5% 8% 40%	2280
	11th to 20th	Day	12% 6% 2 5% 4 4 5% 3 5% 8% 45%	2142
	21st to end	Day	15% 7% 3 9% 5% 5% 4 3 6% 6% 37%	2066
October	1st to 10th	Day	20% 9% 3 7% 5% 4 4 3 5% 7% 34%	1900
	11th to 20th	Day	21% 12% 4 8% 6% 6% 5% 4 5% 6% 24%	1900
	21st to end	Day	28% 14% 5% 9% 6% 4 3 3 5% 6% 17%	2085
November	1st to 10th	Day	17% 15% 4 9% 6% 4 5% 3 5% 7% 24%	1589
	11th to 20th	Day	16% 20% 5% 11% 5% 6% 6% 4 5% 6% 16%	1520
	21st to end	Day	20% 22% 7% 12% 6% 5% 5% 3 4 4 12%	1520
December	1st to 10th	Day	17% 24% 9% 14% 9% 6% 5% 3 3 4 8%	1520
	11th to 20th	Day	18% 20% 6% 15% 7% 6% 4 3 4 5% 12%	1906
	21st to end	Day	26% 18% 6% 16% 7% 6% 4 3 3 4 8%	2675
January	1st to 10th	Night	14% 26% 8% 16% 7% 5% 5% 3 3 3 9%	4616
	11th to 20th	Night	13% 17% 7% 18% 10% 8% 6% 4 5% 4 9%	4216
	21st to end	Night	17% 19% 8% 14% 8% 7% 6% 3 4 5% 10%	4532
February	1st to 10th	Night	12% 20% 6% 16% 9% 4 6% 4 5% 4 14%	2470
	11th to 20th	Night	12% 16% 7% 15% 7% 5% 5% 4 4 5% 20%	2403
	21st to end	Night	15% 15% 5% 14% 7% 5% 5% 4 5% 5% 21%	1988
March	1st to 10th	Night	16% 12% 5% 9% 5% 5% 4 4 5% 6% 29%	3420
	11th to 20th	Night	12% 16% 5% 10% 6% 4 4 3 5% 5% 29%	3479
	21st to end	Night	14% 11% 6% 13% 6% 5% 5% 3 5% 4 27%	3817
April	1st to 10th	Night	19% 14% 4 9% 5% 4 4 3 4 6% 29%	1949
	11th to 20th	Night	19% 9% 3 7% 5% 4 4 3 4 6% 36%	1771
	21st to end	Night	17% 12% 4 8% 4 4 3 3 5% 6% 33%	1710
May	1st to 10th	Night	15% 8% 3 7% 5% 5% 4 3 5% 6% 39%	2833
	11th to 20th	Night	15% 8% 2 6% 5% 4 4 3 6% 7% 39%	2505
	21st to end	Night	11% 6% 2 5% 4 3 4 3 5% 7% 48%	2738
June	1st to 10th	Night	16% 6% 3 7% 6% 4 3 5% 6% 8% 37%	1519
	11th to 20th	Night	11% 5% 2 6% 4 5% 6% 5% 6% 10% 42%	1330
	21st to end	Night	14% 7% 2 7% 4 4 4 4 6% 9% 40%	1330
July	1st to 10th	Night	8% 6% 2 8% 4 5% 4 3 5% 7% 47%	2210
	11th to 20th	Night	14% 5% 2 4 4 3 3 3 5% 6% 51%	2440
	21st to end	Night	8% 5% 2 5% 4 4 5% 4 5% 8% 48%	3019
August	1st to 10th	Night	10% 6% 3 5% 5% 4 5% 4 6% 7% 45%	2825
	11th to 20th	Night	13% 8% 2 6% 4 4 3 3 5% 7% 46%	2785
	21st to end	Night	14% 5% 2 5% 4 4 4 4 5% 7% 45%	3210
September	1st to 10th	Night	11% 6% 3 6% 4 4 4 3 6% 8% 44%	1900
	11th to 20th	Night	14% 6% 2 6% 3 3 4 3 5% 7% 47%	2034
	21st to end	Night	15% 8% 2 8% 5% 4 5% 4 5% 7% 38%	2112
October	1st to 10th	Night	18% 9% 3 9% 5% 4 4 3 4 6% 35%	2280
	11th to 20th	Night	23% 11% 3 8% 5% 5% 5% 3 5% 6% 26%	2280
	21st to end	Night	25% 13% 4 9% 6% 5% 4 4 5% 5% 19%	2510
November	1st to 10th	Night	20% 13% 4 8% 5% 6% 4 3 4 6% 27%	2561
	11th to 20th	Night	18% 21% 5% 10% 6% 5% 4 4 5% 5% 18%	2660
	21st to end	Night	21% 21% 6% 11% 6% 5% 4 3 5% 5% 14%	2660
December	1st to 10th	Night	19% 26% 7% 14% 7% 5% 4 2 3 4 9%	2660
	11th to 20th	Night	15% 22% 7% 14% 7% 5% 4 4 6% 5% 12%	3288
	21st to end	Night	24% 21% 8% 17% 7% 5% 4 2 3 3 7%	4957

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	66% 13% 13% 8% 1	2311
	11th to 20th	Day	71% 12% 8% 8% 2	2726
	21st to end	Day	72% 10% 8% 7% 2	3124
February	1st to 10th	Day	69% 7% 10% 11% 2	1710
	11th to 20th	Day	64% 7% 11% 11% 5% 1	1672
	21st to end	Day	64% 8% 10% 12% 5%	1464
March	1st to 10th	Day	55% 9% 14% 14% 9%	3421
	11th to 20th	Day	58% 7% 12% 16% 6% 1	3480
	21st to end	Day	47% 10% 12% 18% 12% 2	3815
April	1st to 10th	Day	57% 6% 9% 17% 10% 1	2230
	11th to 20th	Day	49% 6% 9% 22% 14% 1	2375
	21st to end	Day	50% 6% 10% 18% 12% 3	2470
May	1st to 10th	Day	45% 8% 11% 21% 13% 2	4120
	11th to 20th	Day	42% 10% 15% 21% 10% 1	4389
	21st to end	Day	37% 8% 13% 22% 18% 3	4837
June	1st to 10th	Day	43% 8% 13% 21% 15% 1	2660
	11th to 20th	Day	36% 9% 14% 24% 16% 1	2845
	21st to end	Day	41% 8% 14% 23% 13% 1	2850
July	1st to 10th	Day	40% 8% 17% 21% 13% 1	4686
	11th to 20th	Day	33% 8% 14% 34% 10% 1	4440
	21st to end	Day	35% 7% 11% 27% 18% 1	4385
August	1st to 10th	Day	41% 7% 15% 24% 12% 1	4091
	11th to 20th	Day	40% 9% 18% 23% 10%	4083
	21st to end	Day	34% 8% 14% 33% 10% 1	4414
September	1st to 10th	Day	41% 8% 14% 25% 10% 1	2280
	11th to 20th	Day	37% 8% 14% 27% 13%	2142
	21st to end	Day	47% 9% 13% 24% 8%	2066
October	1st to 10th	Day	45% 6% 13% 25% 10% 1	3160
	11th to 20th	Day	48% 6% 14% 21% 10%	3140
	21st to end	Day	63% 7% 12% 13% 4	3411
November	1st to 10th	Day	56% 10% 13% 15% 6%	1589
	11th to 20th	Day	63% 10% 11% 10% 5%	1520
	21st to end	Day	72% 9% 10% 7% 1	1520
December	1st to 10th	Day	76% 8% 10% 4 1	1520
	11th to 20th	Day	69% 12% 10% 8% 1	1906
	21st to end	Day	79% 10% 5% 5% 1	2675
January	1st to 10th	Night	72% 12% 9% 6% 1	4616
	11th to 20th	Night	71% 12% 9% 6% 2	4216
	21st to end	Night	71% 11% 10% 5% 2	4532
February	1st to 10th	Night	69% 8% 11% 11% 2	2470
	11th to 20th	Night	63% 7% 11% 15% 4	2405
	21st to end	Night	61% 7% 13% 13% 6%	1988
March	1st to 10th	Night	52% 8% 13% 19% 7% 1	3430
	11th to 20th	Night	50% 10% 15% 17% 8% 1	3480
	21st to end	Night	49% 12% 12% 17% 9% 1	3817
April	1st to 10th	Night	56% 5% 10% 17% 10% 1	1949
	11th to 20th	Night	49% 6% 8% 20% 15% 2	1771
	21st to end	Night	50% 7% 11% 14% 16% 1	1710
May	1st to 10th	Night	41% 9% 14% 17% 16% 2	2840
	11th to 20th	Night	39% 10% 13% 22% 13% 2	2506
	21st to end	Night	33% 8% 13% 26% 19% 2	2739
June	1st to 10th	Night	42% 7% 12% 21% 16% 1	1519
	11th to 20th	Night	34% 8% 14% 23% 20% 1	1330
	21st to end	Night	40% 8% 15% 22% 14% 1	1330
July	1st to 10th	Night	35% 6% 14% 25% 17% 3	2175
	11th to 20th	Night	33% 5% 12% 35% 14% 1	2395
	21st to end	Night	33% 7% 13% 30% 16% 1	2923
August	1st to 10th	Night	36% 6% 14% 27% 16% 1	2814
	11th to 20th	Night	38% 6% 17% 25% 13% 1	2812
	21st to end	Night	37% 6% 12% 32% 12% 1	3210
September	1st to 10th	Night	35% 8% 16% 28% 12% 1	1900
	11th to 20th	Night	34% 8% 15% 28% 16%	2034
	21st to end	Night	44% 9% 13% 24% 10%	2112
October	1st to 10th	Night	40% 6% 11% 24% 18% 1	3800
	11th to 20th	Night	45% 7% 17% 22% 11%	3779
	21st to end	Night	52% 8% 15% 20% 5%	4134
November	1st to 10th	Night	54% 8% 13% 19% 6% 1	2561
	11th to 20th	Night	63% 9% 12% 11% 4 1	2660
	21st to end	Night	68% 11% 12% 8% 1	2660
December	1st to 10th	Night	75% 9% 9% 6% 2	2660
	11th to 20th	Night	69% 11% 12% 7% 1	3288
	21st to end	Night	82% 6% 6% 5% 1	4957

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	16% 28% 34% 16% 6% 1	180
	11th to 20th	Day	20% 27% 34% 15% 4 1	240
	21st to end	Day	27% 19% 32% 19% 2	297
February	1st to 10th	Day	23% 32% 30% 11% 3	270
	11th to 20th	Day	23% 27% 40% 10% 1	270
	21st to end	Day	31% 31% 29% 9%	225
March	1st to 10th	Day	21% 22% 37% 16% 3	446
	11th to 20th	Day	23% 20% 34% 18% 4 1	460
	21st to end	Day	30% 18% 28% 17% 7%	506
April	1st to 10th	Day	25% 20% 33% 15% 6% 1	460
	11th to 20th	Day	34% 17% 22% 17% 6% 4	452
	21st to end	Day	27% 17% 31% 15% 8% 2	460
May	1st to 10th	Day	22% 15% 30% 21% 9% 3	463
	11th to 20th	Day	17% 12% 30% 23% 15% 3	487
	21st to end	Day	17% 11% 29% 24% 15% 4	529
June	1st to 10th	Day	20% 13% 28% 26% 11% 1	490
	11th to 20th	Day	14% 11% 31% 29% 12% 3	675
	21st to end	Day	19% 9% 33% 25% 11% 3	680
July	1st to 10th	Day	11% 7% 28% 31% 18% 4	671
	11th to 20th	Day	13% 10% 27% 29% 15% 8%	533
	21st to end	Day	8% 7% 28% 35% 15% 6%	532
August	1st to 10th	Day	12% 8% 23% 28% 20% 10%	486
	11th to 20th	Day	14% 6% 22% 27% 20% 11%	479
	21st to end	Day	14% 9% 26% 29% 17% 6%	539
September	1st to 10th	Day	15% 10% 26% 26% 16% 8%	490
	11th to 20th	Day	11% 8% 25% 23% 21% 12%	490
	21st to end	Day	15% 13% 28% 24% 14% 5%	490
October	1st to 10th	Day	23% 14% 25% 20% 13% 4	490
	11th to 20th	Day	21% 23% 30% 18% 8%	490
	21st to end	Day	33% 21% 28% 15% 3	534
November	1st to 10th	Day	26% 22% 30% 17% 4 1	227
	11th to 20th	Day	21% 29% 33% 13% 1 2	180
	21st to end	Day	28% 23% 37% 11% 1	180
December	1st to 10th	Day	27% 25% 33% 12% 3	180
	11th to 20th	Day	27% 29% 28% 12% 3 1	180
	21st to end	Day	29% 30% 32% 10%	198
January	1st to 10th	Night	24% 23% 33% 15% 5%	870
	11th to 20th	Night	26% 17% 32% 20% 5%	760
	21st to end	Night	19% 14% 34% 25% 7% 1	836
February	1st to 10th	Night	21% 19% 36% 21% 3	760
	11th to 20th	Night	20% 17% 36% 22% 5%	743
	21st to end	Night	24% 20% 30% 22% 4	628
March	1st to 10th	Night	21% 17% 36% 23% 4	760
	11th to 20th	Night	21% 17% 34% 21% 5% 1	760
	21st to end	Night	21% 15% 30% 25% 8%	836
April	1st to 10th	Night	26% 14% 34% 23% 3	760
	11th to 20th	Night	24% 13% 29% 23% 10% 1	647
	21st to end	Night	23% 13% 26% 27% 11%	570
May	1st to 10th	Night	20% 6% 24% 36% 13% 1	570
	11th to 20th	Night	19% 6% 28% 36% 10% 1	384
	21st to end	Night	12% 4 28% 40% 15%	411
June	1st to 10th	Night	18% 7% 28% 37% 11% 1	380
	11th to 20th	Night	13% 6% 25% 39% 16%	380
	21st to end	Night	16% 4 25% 37% 17% 1	380
July	1st to 10th	Night	9% 6% 16% 48% 20% 1	370
	11th to 20th	Night	10% 5% 25% 38% 21% 1	368
	21st to end	Night	10% 3 24% 38% 24% 1	582
August	1st to 10th	Night	11% 5% 17% 39% 26% 2	567
	11th to 20th	Night	9% 4 18% 37% 29% 3	564
	21st to end	Night	15% 6% 22% 31% 24% 1	674
September	1st to 10th	Night	14% 5% 25% 33% 20% 4	760
	11th to 20th	Night	15% 5% 22% 32% 21% 5%	760
	21st to end	Night	17% 10% 22% 31% 17% 4	760
October	1st to 10th	Night	23% 9% 30% 23% 14% 1	760
	11th to 20th	Night	27% 14% 28% 22% 8% 1	760
	21st to end	Night	30% 17% 32% 18% 4	836
November	1st to 10th	Night	26% 13% 30% 22% 8% 1	755
	11th to 20th	Night	25% 21% 29% 18% 6% 1	760
	21st to end	Night	29% 17% 30% 19% 3	760
December	1st to 10th	Night	29% 22% 32% 13% 4	760
	11th to 20th	Night	25% 20% 37% 15% 3	760
	21st to end	Night	30% 20% 31% 18% 1	883

Page generated at 2024-11-01 22:47:46. Version ac07

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