Timmins
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Timmins clear sky chart from 2005-11-06 to 2024-11-05.

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	17% 12% 4 9% 5% 5% 5% 4 5% 6% 28%	101776
	Night	16% 15% 5% 10% 6% 5% 5% 3 5% 5% 25%	97351
Transparency	Day	57% 5% 11% 19% 8% 1	105225
	Night	60% 5% 10% 17% 7% 1	101990
Seeing	Day	24% 15% 31% 20% 7% 2	15379
	Night	24% 12% 31% 24% 8% 1	24426

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	12% 23% 8% 14% 7% 8% 6% 4 6% 4 8%	2208
	11th to 20th	Day	7% 14% 7% 18% 9% 6% 7% 4 4 5% 18%	2242
	21st to end	Day	11% 22% 11% 13% 6% 7% 4 3 6% 5% 11%	2797
February	1st to 10th	Day	7% 14% 6% 13% 9% 9% 8% 4 5% 7% 19%	1710
	11th to 20th	Day	9% 19% 6% 10% 7% 6% 7% 6% 6% 7% 18%	1663
	21st to end	Day	10% 17% 6% 11% 7% 9% 6% 4 5% 5% 21%	1472
March	1st to 10th	Day	13% 15% 4 10% 7% 6% 5% 4 6% 6% 25%	3266
	11th to 20th	Day	10% 19% 8% 13% 10% 4 3 2 4 5% 22%	3480
	21st to end	Day	13% 16% 4 12% 6% 5% 5% 4 4 5% 26%	3815
April	1st to 10th	Day	19% 17% 5% 10% 5% 4 3 3 5% 5% 23%	2290
	11th to 20th	Day	19% 14% 3 8% 5% 5% 4 3 5% 6% 28%	2442
	21st to end	Day	19% 12% 4 8% 4 4 4 3 4 6% 32%	2470
May	1st to 10th	Day	19% 11% 3 7% 5% 4 4 4 4 7% 32%	4226
	11th to 20th	Day	15% 10% 3 8% 5% 5% 5% 4 6% 7% 32%	4422
	21st to end	Day	19% 10% 3 6% 4 4 4 3 5% 7% 35%	5185
June	1st to 10th	Day	21% 9% 3 8% 5% 5% 5% 4 6% 7% 30%	2850
	11th to 20th	Day	18% 8% 2 6% 4 5% 4 4 5% 8% 36%	2850
	21st to end	Day	22% 8% 2 7% 5% 4 5% 3 5% 7% 31%	2850
July	1st to 10th	Day	19% 7% 3 7% 5% 5% 5% 5% 7% 8% 29%	4760
	11th to 20th	Day	14% 7% 2 7% 5% 5% 5% 4 6% 9% 36%	4760
	21st to end	Day	18% 7% 2 6% 4 5% 4 4 7% 7% 36%	5075
August	1st to 10th	Day	13% 6% 2 7% 5% 5% 5% 5% 7% 8% 38%	4109
	11th to 20th	Day	18% 8% 3 6% 4 4 5% 4 5% 7% 37%	4044
	21st to end	Day	17% 6% 2 6% 4 5% 5% 4 5% 8% 38%	4532
September	1st to 10th	Day	20% 8% 3 7% 5% 4 4 3 5% 7% 35%	2318
	11th to 20th	Day	23% 9% 2 7% 4 4 3 3 5% 7% 33%	2097
	21st to end	Day	24% 11% 2 7% 4 3 3 3 4 5% 33%	2090
October	1st to 10th	Day	24% 14% 4 6% 3 4 3 3 4 6% 30%	1914
	11th to 20th	Day	28% 19% 4 8% 4 5% 3 2 3 4 19%	1900
	21st to end	Day	25% 23% 6% 11% 5% 4 3 3 3 4 13%	1914
November	1st to 10th	Day	22% 20% 6% 12% 5% 4 3 3 4 4 18%	1548
	11th to 20th	Day	18% 22% 8% 15% 7% 5% 3 3 3 4 11%	1520
	21st to end	Day	20% 23% 6% 16% 7% 5% 4 4 3 3 9%	1520
December	1st to 10th	Day	16% 19% 7% 19% 7% 4 5% 3 4 4 12%	1335
	11th to 20th	Day	14% 18% 5% 14% 7% 6% 5% 3 4 5% 17%	1671
	21st to end	Day	16% 21% 10% 19% 8% 4 3 2 3 3 8%	2431
January	1st to 10th	Night	12% 19% 7% 15% 9% 10% 7% 4 4 3 10%	4748
	11th to 20th	Night	9% 16% 7% 15% 9% 7% 8% 5% 6% 5% 13%	4724
	21st to end	Night	9% 22% 11% 14% 7% 7% 5% 3 4 4 14%	4855
February	1st to 10th	Night	8% 14% 5% 11% 11% 8% 6% 4 6% 6% 19%	2470
	11th to 20th	Night	9% 17% 6% 13% 9% 6% 5% 4 6% 7% 20%	2403
	21st to end	Night	10% 17% 6% 14% 7% 7% 6% 4 5% 5% 19%	1979
March	1st to 10th	Night	16% 16% 4 10% 5% 4 4 3 4 4 29%	3573
	11th to 20th	Night	14% 18% 6% 14% 7% 4 3 3 3 4 25%	3479
	21st to end	Night	14% 13% 5% 12% 6% 6% 5% 3 4 5% 27%	3817
April	1st to 10th	Night	18% 15% 5% 10% 5% 4 4 3 5% 6% 26%	1906
	11th to 20th	Night	19% 11% 4 9% 4 4 5% 3 4 6% 30%	1687
	21st to end	Night	19% 12% 3 7% 4 4 4 3 4 5% 35%	1710
May	1st to 10th	Night	18% 12% 3 7% 5% 4 4 3 4 5% 34%	2715
	11th to 20th	Night	15% 9% 4 8% 4 5% 4 4 6% 7% 35%	2469
	21st to end	Night	15% 8% 3 5% 5% 5% 4 3 6% 8% 36%	2402
June	1st to 10th	Night	23% 8% 3 6% 4 4 4 3 5% 8% 32%	1330
	11th to 20th	Night	16% 8% 3 6% 4 5% 5% 3 6% 6% 38%	1330
	21st to end	Night	20% 8% 2 5% 4 4 4 3 6% 9% 35%	1330
July	1st to 10th	Night	16% 8% 2 7% 4 4 3 4 5% 7% 40%	2210
	11th to 20th	Night	16% 8% 3 7% 5% 5% 4 5% 6% 7% 36%	2210
	21st to end	Night	16% 8% 2 6% 4 4 4 3 5% 7% 41%	2485
August	1st to 10th	Night	9% 6% 3 8% 6% 5% 6% 4 6% 8% 40%	2819
	11th to 20th	Night	18% 9% 3 7% 4 3 3 3 5% 6% 39%	2785
	21st to end	Night	14% 7% 2 5% 4 4 3 3 4 6% 48%	3124
September	1st to 10th	Night	20% 7% 3 5% 5% 4 4 3 5% 6% 39%	1843
	11th to 20th	Night	21% 11% 2 6% 3 2 3 2 4 6% 39%	2080
	21st to end	Night	23% 9% 3 5% 4 4 3 3 4 6% 38%	2090
October	1st to 10th	Night	22% 11% 3 7% 5% 4 3 3 5% 6% 30%	2266
	11th to 20th	Night	26% 19% 4 8% 5% 4 4 3 3 5% 20%	2280
	21st to end	Night	23% 21% 5% 7% 6% 3 4 3 4 5% 19%	2682
November	1st to 10th	Night	19% 18% 6% 11% 5% 4 5% 3 5% 4 19%	2628
	11th to 20th	Night	22% 19% 7% 13% 6% 5% 4 2 3 4 15%	2660
	21st to end	Night	19% 22% 7% 15% 8% 5% 4 2 3 3 11%	2660
December	1st to 10th	Night	14% 21% 7% 16% 10% 7% 4 3 4 3 11%	2840
	11th to 20th	Night	15% 18% 7% 14% 9% 7% 5% 4 4 5% 12%	3526
	21st to end	Night	20% 22% 7% 16% 8% 4 4 3 3 3 10%	5236

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	78% 3 9% 8% 2	2209
	11th to 20th	Day	68% 4 8% 16% 4	2242
	21st to end	Day	75% 3 7% 10% 4	2797
February	1st to 10th	Day	66% 4 9% 15% 7%	1710
	11th to 20th	Day	63% 4 10% 14% 8%	1672
	21st to end	Day	65% 3 6% 16% 9% 1	1472
March	1st to 10th	Day	60% 4 11% 18% 6%	3269
	11th to 20th	Day	66% 4 9% 15% 6% 1	3480
	21st to end	Day	61% 3 7% 16% 12% 2	3815
April	1st to 10th	Day	64% 4 7% 16% 9% 1	2290
	11th to 20th	Day	57% 4 7% 21% 9% 1	2442
	21st to end	Day	54% 4 9% 17% 13% 2	2470
May	1st to 10th	Day	52% 5% 10% 20% 12% 1	4238
	11th to 20th	Day	49% 5% 14% 21% 10% 1	4426
	21st to end	Day	50% 5% 11% 19% 13% 3	5185
June	1st to 10th	Day	53% 4 12% 20% 10%	2850
	11th to 20th	Day	46% 5% 11% 22% 15% 1	2850
	21st to end	Day	52% 5% 12% 20% 9% 1	2850
July	1st to 10th	Day	49% 7% 14% 23% 6%	4686
	11th to 20th	Day	42% 8% 19% 22% 9% 1	4679
	21st to end	Day	46% 5% 12% 29% 7%	4914
August	1st to 10th	Day	42% 7% 16% 28% 8%	4095
	11th to 20th	Day	46% 6% 14% 28% 6%	4083
	21st to end	Day	43% 6% 15% 28% 6% 2	4531
September	1st to 10th	Day	50% 5% 16% 20% 8% 1	2318
	11th to 20th	Day	52% 6% 16% 21% 5%	2097
	21st to end	Day	55% 5% 12% 21% 8%	2090
October	1st to 10th	Day	56% 4 14% 20% 5%	3174
	11th to 20th	Day	61% 3 11% 19% 5%	3140
	21st to end	Day	72% 3 11% 8% 5%	3126
November	1st to 10th	Day	69% 5% 12% 9% 5%	1548
	11th to 20th	Day	79% 3 8% 8% 3	1520
	21st to end	Day	81% 3 8% 7% 1	1520
December	1st to 10th	Day	77% 3 8% 7% 4	1335
	11th to 20th	Day	70% 4 8% 15% 3	1671
	21st to end	Day	83% 3 5% 7% 2	2431
January	1st to 10th	Night	78% 3 10% 8% 1	4748
	11th to 20th	Night	71% 3 8% 15% 3	4724
	21st to end	Night	75% 3 8% 11% 3	4855
February	1st to 10th	Night	63% 5% 11% 14% 7%	2470
	11th to 20th	Night	64% 3 11% 16% 6%	2405
	21st to end	Night	66% 4 8% 13% 8% 1	1979
March	1st to 10th	Night	59% 4 10% 17% 9% 1	3583
	11th to 20th	Night	66% 3 7% 15% 8% 1	3480
	21st to end	Night	60% 5% 7% 14% 13% 2	3817
April	1st to 10th	Night	60% 4 7% 16% 11% 1	1906
	11th to 20th	Night	55% 3 7% 21% 11% 2	1687
	21st to end	Night	51% 4 8% 17% 17% 2	1710
May	1st to 10th	Night	51% 5% 7% 20% 14% 2	2722
	11th to 20th	Night	46% 5% 12% 27% 9% 1	2470
	21st to end	Night	45% 6% 13% 19% 16% 2	2403
June	1st to 10th	Night	50% 5% 11% 18% 13% 2	1330
	11th to 20th	Night	45% 6% 9% 23% 16% 2	1330
	21st to end	Night	46% 4 14% 23% 12% 1	1330
July	1st to 10th	Night	43% 6% 13% 29% 9%	2175
	11th to 20th	Night	45% 7% 15% 24% 8%	2168
	21st to end	Night	44% 6% 14% 26% 9%	2406
August	1st to 10th	Night	40% 7% 15% 33% 5%	2809
	11th to 20th	Night	45% 6% 14% 31% 4	2812
	21st to end	Night	38% 4 12% 33% 11% 1	3124
September	1st to 10th	Night	46% 5% 16% 23% 9%	1843
	11th to 20th	Night	48% 5% 19% 23% 5%	2080
	21st to end	Night	50% 5% 15% 23% 7%	2090
October	1st to 10th	Night	53% 6% 12% 23% 7%	3786
	11th to 20th	Night	61% 5% 10% 19% 5%	3779
	21st to end	Night	64% 6% 14% 11% 5%	4420
November	1st to 10th	Night	68% 6% 10% 12% 3	2628
	11th to 20th	Night	74% 4 9% 9% 3	2660
	21st to end	Night	79% 4 9% 7% 1	2660
December	1st to 10th	Night	78% 5% 8% 7% 3	2840
	11th to 20th	Night	75% 4 7% 11% 3	3525
	21st to end	Night	80% 3 7% 7% 3	5236

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	23% 18% 37% 15% 5% 2	180
	11th to 20th	Day	17% 18% 38% 20% 6% 1	189
	21st to end	Day	21% 13% 35% 26% 4 1	297
February	1st to 10th	Day	18% 26% 34% 16% 4 1	270
	11th to 20th	Day	20% 20% 40% 16% 1 2	270
	21st to end	Day	26% 27% 36% 10% 1	225
March	1st to 10th	Day	19% 21% 38% 19% 3	354
	11th to 20th	Day	24% 18% 33% 17% 5% 1	460
	21st to end	Day	25% 19% 32% 17% 5% 1	506
April	1st to 10th	Day	23% 21% 32% 17% 7% 1	460
	11th to 20th	Day	29% 19% 27% 17% 6% 3	452
	21st to end	Day	29% 18% 28% 15% 7% 2	460
May	1st to 10th	Day	24% 14% 33% 19% 7% 2	463
	11th to 20th	Day	22% 16% 33% 20% 8% 2	498
	21st to end	Day	24% 14% 33% 23% 6% 1	734
June	1st to 10th	Day	24% 13% 35% 22% 5% 1	680
	11th to 20th	Day	23% 16% 32% 20% 9% 1	680
	21st to end	Day	25% 11% 27% 24% 11% 2	680
July	1st to 10th	Day	18% 11% 35% 25% 8% 3	671
	11th to 20th	Day	17% 12% 30% 28% 11% 2	668
	21st to end	Day	19% 8% 31% 27% 12% 4	739
August	1st to 10th	Day	15% 13% 29% 26% 12% 4	491
	11th to 20th	Day	20% 7% 24% 26% 16% 6%	479
	21st to end	Day	23% 10% 27% 23% 11% 6%	539
September	1st to 10th	Day	23% 11% 31% 19% 12% 3	490
	11th to 20th	Day	29% 9% 29% 22% 8% 3	490
	21st to end	Day	31% 13% 25% 21% 9% 1	490
October	1st to 10th	Day	31% 15% 26% 20% 7% 2	490
	11th to 20th	Day	34% 18% 31% 12% 3 1	490
	21st to end	Day	33% 21% 31% 12% 2 1	363
November	1st to 10th	Day	37% 18% 30% 13% 1	203
	11th to 20th	Day	35% 21% 29% 12% 3 1	180
	21st to end	Day	34% 22% 32% 9% 2 1	180
December	1st to 10th	Day	24% 17% 36% 14% 7% 1	180
	11th to 20th	Day	24% 21% 37% 11% 6% 2	180
	21st to end	Day	30% 19% 32% 12% 6% 1	198
January	1st to 10th	Night	25% 13% 37% 19% 5% 1	950
	11th to 20th	Night	22% 14% 33% 24% 7% 1	950
	21st to end	Night	18% 13% 29% 28% 10% 1	1029
February	1st to 10th	Night	15% 14% 37% 24% 9% 1	760
	11th to 20th	Night	19% 15% 33% 25% 8%	743
	21st to end	Night	19% 18% 38% 19% 6%	628
March	1st to 10th	Night	19% 16% 34% 23% 6% 1	760
	11th to 20th	Night	24% 19% 30% 22% 5% 1	760
	21st to end	Night	22% 12% 37% 21% 7% 1	836
April	1st to 10th	Night	27% 13% 31% 23% 6% 1	695
	11th to 20th	Night	24% 14% 28% 24% 9% 1	563
	21st to end	Night	23% 11% 30% 25% 10% 1	570
May	1st to 10th	Night	22% 8% 32% 32% 6%	504
	11th to 20th	Night	21% 10% 33% 27% 6% 2	374
	21st to end	Night	19% 9% 34% 32% 6%	411
June	1st to 10th	Night	28% 9% 25% 31% 7%	380
	11th to 20th	Night	18% 9% 33% 29% 10% 1	380
	21st to end	Night	21% 7% 26% 34% 12% 1	380
July	1st to 10th	Night	18% 9% 30% 32% 11% 1	370
	11th to 20th	Night	18% 5% 28% 37% 11%	368
	21st to end	Night	16% 6% 26% 35% 15% 2	463
August	1st to 10th	Night	16% 6% 29% 33% 15% 2	567
	11th to 20th	Night	19% 5% 23% 32% 20% 2	564
	21st to end	Night	20% 9% 27% 27% 15% 2	627
September	1st to 10th	Night	23% 8% 28% 25% 14% 1	703
	11th to 20th	Night	28% 8% 27% 23% 12% 1	760
	21st to end	Night	28% 9% 25% 26% 11% 2	760
October	1st to 10th	Night	28% 11% 28% 24% 7% 1	760
	11th to 20th	Night	36% 13% 29% 14% 6% 1	760
	21st to end	Night	34% 13% 29% 18% 5% 1	836
November	1st to 10th	Night	29% 16% 29% 20% 5% 1	760
	11th to 20th	Night	33% 15% 29% 18% 4	760
	21st to end	Night	33% 14% 34% 15% 3 1	760
December	1st to 10th	Night	24% 17% 32% 20% 6% 1	940
	11th to 20th	Night	26% 14% 34% 19% 6% 1	950
	21st to end	Night	30% 14% 28% 21% 6% 1	1045

Page generated at 2024-11-03 02:11:25. Version ac07

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